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Home My WebLink AboutStaff Report 3.C 01/07/2019 Attachment 5CEQA Environmental Checklist PROJECT DESCRIPTION AND BACKGROUND Project Title: Petaluma River Flood Management Denman Reach Phase 4 Lead agency name and address: City of Petaluma, Public Works and Utilities 202 N McDowell Blvd Petaluma, CA 94954 Contact person and phone number: Jason Beatty, Assistant Director of Public Works and Utilities (707) 7784514 Tim Moresco, Associate Civil Engineer 707 778=4355 Project Location: Intersection of Petaluma Boulevard North, and Industrial Avenue; along the Petaluma River downstream (south) to Corona Road, Petaluma, CA 94952 Project sponsor's name and address: City of Petaluma, Public Works and Utilities 202 N McDowell Blvd Petaluma, CA 94954 General plan description: Business Park, Floodway, and Floodplain Zoning: Planned Community District (PCD) and Floodwa Description of project: (Describe the whole See narrative below action involved, including but not limited to later phases of the project, and any secondary, support, or off-site features necessary for its implementation.) Surrounding land uses and setting; briefly Light industrial buildings to the describe the project's surroundings: north, south, and east; Petaluma River to the west Other public agencies whose approval is Sonoma County Water Agency, required (e.g. permits, financial approval, or Sonoma County Transportation & participation agreements): Public Works, California Department of Fish and Wildlife (1602 Streambed Alteration Agreement), Regional Water Quality Control Board (401 Water Quality Certification), the California Department of Water Resources as project grant funding Page 1 of 23 August 23, 2017 Description of Project: The proposed project will provide continued flood improvements along the Petaluma River with the fourth phase of the Denman each project by providing offline detention basins at Denman Reach in order to capture peak flows during storm events, and sediment removal near the Corona Road bridge and in order to return the channel to the cross section designed during bridge installation. The detention basins at Denman Reach will be divided up into two basins within the parcel that are broken up by the existing sewer and water mains that split the parcel. Each basin will have a weir opening to allow the peak flows into the basin. The weirs will be installed in line with the existing trail, which will be maintain compliance with the guidelines set forth by the American Disabilities Act. This project will also propose an additional 1,000 linear feet of a loop trail around the basins. The detention basins will provide nearly 10 acre -ft of storage. Another aspect of this portion of the project will be to create seasonal wetlands to mitigate the existing wetlands that are being removed as part of the basin excavation. The sediment removal at the Corona Road bridge will remove roughly 6,150 cubic yards of sediment build up to restore the channel to the section designed during the bridge installation. To accomplish this task, vegetation, as well as, several trees within the current channel will have to be removed. The potential beneficial hydrological impacts of increasing the flood water capacity within this Reach are addressed in the attached WEST Consultants, Inc., "Denman Reach Page 2 of 23 August 23, 2017 agency) and the United States Army Corps of Engineers, potential Section 401 Nationwide Permit Have California Native American tribes The local California Native American traditionally and culturally affiliated with the tribes that may have an interest in project area requested consultation pursuant to the project site will be directly Public Resources Code section 21080.3.1? If so, has consultation begun? notified of this initial study. Note: Conducting consultation early in the CEQA process allows tribal governments, lead agencies, and project proponents to discuss the level of environmental review, identify and address potential adverse impacts to tribal cultural resources, and reduce the potential for delay and conflict in the environmental review process. (See Public Resources Code section 21083.3.2.) Information may also be available from the California Native American Heritage Commission's Sacred Lands File per Public Resources Code section 5097.96 and the California Historical Resources Information System administered by the California Office of Historic Preservation. Please also note that Public Resources Code section 21082.3(c) contains provisions specific to confidentiality. Description of Project: The proposed project will provide continued flood improvements along the Petaluma River with the fourth phase of the Denman each project by providing offline detention basins at Denman Reach in order to capture peak flows during storm events, and sediment removal near the Corona Road bridge and in order to return the channel to the cross section designed during bridge installation. The detention basins at Denman Reach will be divided up into two basins within the parcel that are broken up by the existing sewer and water mains that split the parcel. Each basin will have a weir opening to allow the peak flows into the basin. The weirs will be installed in line with the existing trail, which will be maintain compliance with the guidelines set forth by the American Disabilities Act. This project will also propose an additional 1,000 linear feet of a loop trail around the basins. The detention basins will provide nearly 10 acre -ft of storage. Another aspect of this portion of the project will be to create seasonal wetlands to mitigate the existing wetlands that are being removed as part of the basin excavation. The sediment removal at the Corona Road bridge will remove roughly 6,150 cubic yards of sediment build up to restore the channel to the section designed during the bridge installation. To accomplish this task, vegetation, as well as, several trees within the current channel will have to be removed. The potential beneficial hydrological impacts of increasing the flood water capacity within this Reach are addressed in the attached WEST Consultants, Inc., "Denman Reach Page 2 of 23 August 23, 2017 Basins and Corona Bridge Sediment Removal (Denman Reach Phase 4)", dated July 26, 2018, which is attached and incorporated herein by reference (see Attachment II). This project is one of numerous small, incremental, low.impact projects throughout the Petaluma River Watershed seen as integral to a long-term flood reduction and riparian corridor restoration strategy. The City has previously received three phases of grant funding from the California Department of Water Resources, for acquisition and restoration of 7 parcels along the Petaluma River, within the Denman Reach area. Implementation of these projects is undertaken pursuant to the Petaluma River Access and Enhancement Plan (River Plan, adopted in 1996 and readopted within the General Plan 2025 in 2008). This project includes the acquisition of one parcel along Industrial Avenue, within Denman Reach. Funding for the acquisition and all the physical improvements have been secured through the State Department of Water Resources and Sonoma Water. The City proposes to continue the implementation of the River Plan through this Reach of the Petaluma River. Phases 1 and 2 were completed and accepted by the City in December 2005 and Phase 3 was completed and accepted in March of 2017. Phase 4 is anticipated to begin construction in May 2019 and be complete and accepted by the City by December 2019. Page 3 of 23 August 23, 2017 ENVIRONMENTAL FACTORS POTENTIALLY AFFECTED: The environmental factors checked below would be potentially affected by this project. Please see the checklist beginning on page 3 for additional information. ❑ I find that the proposed project COULD NOT have a significant effect on the environment, and Aesthetics a NEGATIVE DECLARATION will be prepared. Agriculture and Forestry I find that although the proposed project could have a significant effect on the environment, ❑ Air Quality ® made by or agreed to by the project proponent. A MITIGATED NEGATIVE DECLARATION Biological Resources will be prepared. Cultural Resources I find that the proposed project MAY have a significant effect on the environment, and an ® Geology/Soils Greenhouse Gas Emissions Hazards and Hazardous Materials ® Hydrology/Water Quality has been addressed by mitigation measures based on the earlier analysis as described on Land Use/Planning only the effects that remain to be addressed. Mineral Resources I find that although the proposed project could have a significant effect on the environment, ❑ because all potentially significant effects (a) have been analyzed adequately in an earlier EIR Noise or NEGATIVE DECLARATION pursuant to applicable standards, and (b) have. been avoided or mitigated pursuant to that earlier EIR or NEGATIVE DECLARATION, including revisions or Population/Housing mitigation measures that are imposed upon the proposed project, nothing further is required, Public Services ❑ Recreation Transportation/Traffic ❑ Tribal Cultural Resources El Utilities/Service Systems Mandatory Findings of Significance DETERMINATION: On the basis of this initial evaluation: Si I find that the proposed project COULD NOT have a significant effect on the environment, and a NEGATIVE DECLARATION will be prepared. ® I find that although the proposed project could have a significant effect on the environment, there will not be a significant effect in this case because revisions in the project have been made by or agreed to by the project proponent. A MITIGATED NEGATIVE DECLARATION Printed will be prepared. Dan St. John, Director of Public Works and Utilities I find that the proposed project MAY have a significant effect on the environment, and an ENVIRONMENTAL IMPACT REPORT is required. I find that the proposed project MAY have a "potentially significant impact" or "potentially significant unless mitigated" impact on the environment, but at least one effect 1) has been adequately analyzed in an earlier document pursuant to applicable legal standards, and 2) has been addressed by mitigation measures based on the earlier analysis as described on attached sheets. An ENVIRONMENTAL IMPACT REPORT is required, but it must analyze only the effects that remain to be addressed. I find that although the proposed project could have a significant effect on the environment, because all potentially significant effects (a) have been analyzed adequately in an earlier EIR or NEGATIVE DECLARATION pursuant to applicable standards, and (b) have. been avoided or mitigated pursuant to that earlier EIR or NEGATIVE DECLARATION, including revisions or mitigation measures that are imposed upon the proposed project, nothing further is required, Si nature: Date: 8/22/18 Printed Name: Dan St. John, Director of Public Works and Utilities Page 4 of 23 August 23, 2017 CEQA Environmental Checklist This checklist identifies physical, biological, social and economic factors that might be affected by the proposed project. In many cases, background studies performed in connection with the projects indicate no impacts. A NO IMPACT answer in the last column reflects this determination. Were there is a need for clarifying discussion, the discussion is included either following the applicable section of the checklist or is within the body of the environmental document itself. The words "significant" and "significance" used throughout the following checklist are related to CEQA, not NEPA, impacts. The questions in this form are intended to encourage the thoughtful assessment of impacts and do not represent thresholds of significance. Potentially Less Than Less Than No Impact Significant Significant Significant Impact with Impact Mitigation I. AESTHETICS: Would the project: a) Have a substantial adverse effect on a scenic vista? ❑ ❑ ❑ b) Substantially damage scenic resources, including, but not ❑ ❑ ❑ limited to, trees, rock outcroppings, and historic buildings within a state scenic highway? c) Substantially degrade the existing visual character or quality ❑ ❑ ❑ of the site and its surroundings? d) Create a new source of substantial light or glare which would ❑ ❑ ❑ adversely affect day or nighttime views in the area? Discussion: The majority of the Petaluma River Flood Management Denman Phase 4 project area is primarily disturbed grassland, devoid of trees and shrubs. The majority of the land will be used as detention basins. Vegetation will be provided along the frontage of the site along Industrial Avenue in order to preserve and improve the visual character of the property. II. AGRICULTURE AND FOREST RESOURCES: Potentially In determining whether impacts to agricultural resources are Significant significant environmental effects, lead agencies may refer to the Impact California Agricultural Land Evaluation and Site Assessment Model (1997) prepared by the California Dept. of Conservation as an optional model to use in assessing impacts on agriculture and farmland. In determining whether impacts to forest resources, including timberland, are significant environmental effects, lead agencies may refer to information compiled by the California Department of Forestry and Fire Protection regarding the state's inventory of forest land, including the Forest and Range Assessment Project and the Forest Legacy Assessment Project; and the forest carbon measurement methodology provided in Forest Protocols adopted by the California Air Resources Board. Would the project: a) Convert Prime Farmland, Unique Farmland, or Farmland of ❑ Statewide Importance (Farmland), as shown on the maps prepared pursuant to the Farmland Mapping and Monitoring Program of the California Resources Agency, to non-agricultural use? Page 5 of 23 August 23, 2017 Less Than Less Than No Impact Significant Significant with Impact Mitigation b) Conflict with existing zoning for agricultural use, or a Williamson Act contract? c) Conflict with existing zoning for, or cause rezoning of, forest land (as defined in Public Resources Code section 12220(g)), timberland (as defined by Public Resources Code section 4526), or timberland zoned Timberland Production (as defined by Government Code section 51104(g))? d) Result in the loss of forest land or conversion of forest land to non -forest use? e) Involve other changes in the existing environment which, due to their location or nature, could result in conversion of Farmland, to non-agricultural use or conversion of forest land to non -forest use? Discussion: No impact, no mitigation necessary III. AIR QUALITY: Where available, the significance criteria Potentially Less Than Less Than No Impact established by the applicable air quality management or air Significant Significant Significant pollution control district may be relied upon to make the Impact with Impact following determinations, Would the project: Mitigation a) Conflict with or obstruct implementation of the applicable air quality plan? b) Violate any air quality standard or contribute substantially to an existing or projected air quality violation? c) Result in a cumulatively considerable net increase of any criteria pollutant for which the project region is non- attainment under an applicable federal or state ambient air quality standard (including releasing emissions which exceed quantitative thresholds for ozone precursors)? d) Expose sensitive receptors to substantial pollutant concentrations? e) Create objectionable odors affecting a substantial number of people? Discussion: No impact, no mitigation necessary IV. BIOLOGICAL RESOURCES: Would the project: Potentially Less Than Less Than No Impact Significant Significant Significant Impact with Impact Mitigation a) Have a substantial adverse effect, either directly or through habitat modifications, on any species identified as a candidate, sensitiveJ or special status species in local or regional plans, policies, or regulations, or by the California Department of Fish and Game or U.S. Fish and Wildlife Service? El X 0 11 b) Have a substantial adverse effect on any riparian habitat or other sensitive natural community identified in local or regional plans, policies, regulations or by the California Department of Fish and Game or US Fish and Wildlife Service? Page 6 of 23 August 23, 2017 c) Have a substantial adverse effect on federally protected Ll ® Li Ll wetlands as defined by Section 404 of the Clean Water Act (including, but not limited to, marsh, vernal pool, coastal, etc.) through direct removal, filling, hydrological interruption, or other means? d) Intertere substantially with the movement of any native resident or migratory fish or wildlife species or with established native resident or migratory WIdlife corridors, or impede the use of native wildlife nursery sites? e) Conflict with any local policies or ordinances protecting biological resources, such as a tree preservation policy or ordinance? f) Conflict with the provisions of an adopted Habitat Conservation Plan, Natural Community Conservation Plan, or other approved local, regional, or state habitat conservation pIan? Discussion: A biological Resource Assessment was completed by WRA, Inc. that covers the City's Petaluma River Flood Management Denman Phase 4 project and is attached and incorporated herein by reference. The biological assessment and subsequent work effort was performed in order to determine plant communities present in the Study Area, if existing conditions provided suitable habitat for any special -status plant or wildlife species, and if sensitive habitats are present. Additionally, a routine jurisdictional wetland delineation and delineation of streams and riparian areas was conducted concurrently with the site assessment. According to a search of the California Natural Diversity Database (CNDDB) maintained by the California Department of Fish and Wildlife (CDFW), 90 special -status plant species have been documented in the vicinity of the project area, 6 special -status plant species have a moderate potential to occur within the project area. Based on review of the CNDDB and United States Fish and Wildlife Services (USFWS), 84 special -status wildlife species have been recorded in the vicinity of the project area, 19 special -status wildlife species have a moderate to high potential to occur within the project area. The project area is divided up between 6 different biological communities, three of which are non - sensitive biological communities (Developed, non-native grassland, and stormwater retention basin), and three that are sensitive (Perennial stream, seasonal wetland depression, and riparian red willow thicket). The perennial stream, also known as the Petaluma River, makes up about 0.27 acres, or 383 linear feet, of the Sensitive Biological Community within the project area, and likely flows 12 months out of the year. The woody species found on the banks include box elder, Oregon Ash, California bay, arroyo willow, and red willow. Shrubby and herbaceous vegetation on the banks includes Himalayan blackberry, stinging nettle, flat nutsedge, smartweed, mugwort, and poison hemlock. This is also a designated essential fish habitat for coho and chinook salmon. The project area does contain approximately 0.24 acres of seasonal wetland depressions. The vegetation is dominated by hydrophytic grasses and forbs, with the most frequently observed species being Italian rye grass, and curly dock. Page 7 of 23 August 23, 2017 Of the non -sensitive biological communities, the developed land makes up 0.5 acres of the site and is largely devoid of vegetation. A riparian red willow thicket and coast redwood trees were identified as being within the developed area. The non-native grassland makes up the majority of the project area at 5.42 acres and is mostly dominated by two non-native grass species including Harding grass and Italian Rye grass. Individual native oak trees within this community may be considered "protected trees" per the Petaluma Tree Preservation Ordinance. A permit from the City of Petaluma will be acquired for the removal of any protected tree. The Denman Reach Phase 4 of the Petaluma River is also within the range of the federally=listed (threatened) California red -legged frog (CRLF). A reconnaissance survey conducted for the Denman Reach confirmed the presence of suitable habitat; and since CRLF is known to occur within the watershed; is presumed to be present. Mitigation Measure BIO -1: Impacts to Waters of the United States, and Waters of the State Prior to filling of jurisdictional waters, or construction activities within Corps, RWQCB or CDFW jurisdiction, necessary regulatory permits will be obtained from the appropriate agencies. Regulatory permits to be obtained include a Corps Permit, Regional Water Quality Control Board Section 401 Water Quality Certification and/or Waste Discharge Requirement. Prior to proposed filling of jurisdictional waters, compliance with all regulatory agency permit conditions shall be demonstrated. Permanent impacts to jurisdictional wetlands will be mitigated at a minimum 1:1 ratio on a functions and values basis by: (1) restoring wetlands in the Study Area; (2) purchasing an appropriate amount of mitigation credits by an approved mitigation bank, or (3) another type of mitigation as approved by the Corps, RWQCB, and/or CDFW through the permitting process. With the implementation of these measures, the Project impact on waters of the U.S. and State will be less than significant. Mitigation Measure BIO -2: Impacts to Riparian Vegetation Prior to removing riparian vegetation or construction activities within CDFW or RQCB jurisdiction, necessary regulatory permits will be obtained from the appropriate agencies. Regulatory permits to be obtained include a CFGC Section 1602 Streambed Alteration Agreement. The project shall comply with all regulatory agency permit conditions and compensatory mitigation measures as determined and required by regulatory agencies during permit authorization, but shall be no less than 1:1 replacement ratio. Mitigation options will include the following: (1) planting replacement riparian vegetation, (2) purchase of mitigation bank credits from an approved mitigation bank, and/or (3) paying an in -lieu fee to a natural resource agency or habitat resource organization. For habitat that is preserved and/or established for mitigation, a Habitat Mitigation and Monitoring Plan (HMMP) shall be prepared. The HMMP will include a detailed description of restoration/enhancement/preservation actions; restoration performance criteria for each biological parameter (i.e., native/invasive plants, wildlife use); and a monitoring/maintenance/reporting requirements for each biological parameter to evaluate restoration performance criteria. With the implementation of these measures, the Project impact on riparian vegetation will be less than significant. Mitigation Measure BI0 -3: Protected Tree Removal A permit from the City of Petaluma will be acquired for the removal of any protected tree within City limits. Conditions of approval may include tree replacement plantings or the payment of in -lieu fees. With the implementation of these measures, the Project impact on protected trees will be less than significant. Page 8 of 23 August 23, 2017 Mitigation Measure BIO -4: Potential Impacts to Special -status Plant Species Six special -status plant species have potential to occur in the Study Area. To avoid impacts to special -status plants, protocol -level surveys shall be conducted during the documented bloom period of the species. Two site visits, including one early -season (May), and one late -season (July) will be sufficient to cover the bloom periods of the six species with potential to occur. Survey timing may fluctuate based on blooming periods of appropriate reference site locations. If special -status plant surveys result in negative findings, no impacts would occur, and no mitigation would be required. However, if special -status plants are identified in the impact area, mitigation will be required. Mitigation will include avoidance, or if avoidance is not feasible, seeds collection and re-establishment at a minimum 1:1 ratio (number of plant established: number of plants impacted) in preserved, suitable habitat. Re-established populations shall be monitored annually in accordance with an approved HMMP for a minimum of five years. Reports describing performance results will be prepared and submitted for years 1, 3, and 5 during the monitoring period. With the implementation of these measures, the Project impact on special -status plants will be less than significant. Mitigation Measure BIO -5: Bat Avoidance While trees are not typically used as hibernation roosts, mature oaks and other large trees on the property could potentially be used as day or maternity roosting sites by bats. All bat roosts, including those of non -special -status bats are protected by CDFW. To avoid impacts to roosting bats, any project activities that would impact potential bat roosts shall be initiated outside of the maternity roosting season (March 1 — July 31). If project work such as the felling of trees cannot occur outside of the maternity season, then a bat roost survey shall be conducted within 14 days prior to the start of such activities. Any structures or trees that are determined to support roosts shall have a 200400t no work buffer placed around them, and the buffer shall not be lifted until the maternity season has completed. In addition, when any large trees are removed, they shall be allowed to lie undisturbed on the ground for one night to allow any roosting bats to escape on their own before the trees are processed. With the implementation of these measures, the Project impact on bats will be less than significant. Mitigation Measure BIO -6: Bird Avoidance For the protection ofspecial-status birds, and native nesting birds protected by the MBTA and CFGC, future Project activities shall occur outside of the nesting season from September 1— January 31, to the extent feasible. If working outside of the nesting season is not possible, and project activities are initiated during the nesting season (February 1—August 31), a qualified wildlife biologist shall conduct a nesting bird survey no more than 14 days prior to the start of Project activities. If no active nests are identified during the surveys, no impacts will occur to birds and work will progress without restriction. If active nests are identified, a no -disturbance buffer around the nest shall be implemented to avoid impacts to nesting birds. Buffers will be determined by a qualified biologist, and typically range from 25 feet to 500 feet depending on the species and protection status of that species. Once an active nest is determined to no longer be active, because of young fledging or predation, the buffer around the nest shall be removed and work shall progress without restriction. With the implementation of these measures, the Project impact on nesting and/or protected birds will be less than significant. Page 9 of 23 August 23, 2017 Mitigation measure BIO -7: Special -status fish Aquatic habitat activities shall be completed during the dry season, between July 15 and October 1. Regulatory approval shall be obtained for all work within potentially jurisdictional areas from respective agencies. Approvals from the RWQCB, CDFW, and Corps are required based on project designs (City of Petaluma 2016). The Petaluma River is also designated critical habitat for California central coast chinook and California central coast steelhead, and is considered EFH for coho and chinook salmon. Therefore, it is likely that the Corps will consult with the USFWS and NMFS for impacts to the Petaluma River. All work within these areas shall conform to any conditions imposed by the regulating agencies. Prior to construction, the contractor shall be required to prepare an Accidental Spill Prevention and Cleanup Plan. This plan shall include required spill control absorbent material, for use beneath stationary equipment, to be present on-site and available at all times. All refueling and maintenance of equipment, other than stationary equipment, shall occur at least 100 feet from the creek's top -of --bank. Refueling or maintenance of stationary equipment within the channel (top of bank to top of bank) shall only occur when secondary containment sufficient to eliminate escape of all potential fluids is in place. Any hazardous chemical spills shall be cleaned immediately. All stockpiling of construction materials, equipment, and supplies, including storage of chemicals, refueling and maintenance, with the exception of stationary equipment, shall occur outside the creek channel. No equipment shall be washed where runoff could enter the creek. No motorized equipment shall be le$ within the channel (top of bank to top of bank) overnight. Work shall be conducted in isolation from flowing water. Prior to the start of construction activities, the work area shall be isolated using temporary water diversion materials such as sand bags or other similar methods, and flowing water shall be temporarily diverted around the isolated area. If de -watering is necessary, pumps with 0.2 -inch mesh shall be used to remove standing water from the work area within the cofferdams to a filtration basin to prevent direct discharge into the creek. If a filtration basin is not available, filter bags will be placed surrounding the hose - release and the hose -release end shall be placed on a level area outside of the wetted creek channel to allow water to settle prior to returning to the creek. No pumped water shall be directly discharged into the creek. Allowing the pumped water to settle in a filtration basin or release through filter bags will prevent increase in turbidity or sediment loads during the de -watering process. If de -watering is necessary, a de -watering plan shall be submitted for agency approval. By implementing these measures, the Project's impacts to special -status fish, including salmonids, shall be reduced to less than significant. Page 10 of 23 August 23, 2017 Mitigation Measure BIO -7: CRLF Although the lack of upland habitat, lack of connectivity to suitable breeding habitat, intense flooding, sedimentation and introduced predators/competitors reduce the potential for CRLF to occur within the Study Area, measures to avoid CRLF impacts shall be implemented. The following measures shall be implemented to avoid CRLF and are in agreement with the measures described in the NLAA that was issued for this project (Corps 2016). An environmental awareness training for all crews working on the site shall include education on sensitive resources such as protected wildlife with the potential to occur within the area (identification, regulatory status, natural history), water quality and environmental protection measures. Within 48 hours prior to any construction activities, a biologist approved by USFWS (Approved Biologist) shall conduct surveys for CRLF in and adjacent to the Action Area, 100 feet upstream and 100 feet downstream of the Study Area, The Approved Biologist shall have stop work authority to protect natural resources or ensure personal safety or the safety of workers. If CRLF are detected during surveys, work shall cease until consultation with the appropriate agencies can be completed. If no CRLF are found during the preconstruction surveys, the Study Area shall be surveyed each day prior to commencement of work by the Approved Biologist or a qualified biologist under the direction of the Approved Biologist to ensure that no CRLF are present in the Study Area until vegetation removal and exclusion fence installation are complete. After vegetation clearance and exclusion fence installation, activities may continue inside fenced areas without the presence of a biologist unless work is halted for more than 10 days, then a pre -construction survey for CRLF shall be conducted prior to re-initiation of work. All workers shall ensure that food scraps, paper wrappers, food containers, cans, bottles, and other trash from the work area are deposited in covered or closed trash containers. Trash in the containers shall be removed and disposed of off-site daily. Prior to the commencement of operation of wheeled or equipment with tracks in undisturbed areas, vegetation that could conceal CRLF shall be removed by hand under the supervision of a qualified biologist after the Approved Biologist has surveyed the area and determined it to be free of CRLF. If vegetation is too dense to be adequately surveyed (tall grasses, blackberry etc.), the Approved Biologist, at his or her discretion, may request that vegetation is cut to a height of 6-12 inches (and cut vegetation removed) prior to conducting a survey. If no CRLF are found, the vegetation shall be cut to ground level, and this shall ensure that no CRLF are harmed by cutting tools. Exclusion fence shall be installed around staging areas and Study Areas after vegetation removal is complete. A qualified biologist under direction of the Approved Biologist will oversee the installation of the fence. Once the fence is installed, the periodic inspections by the qualified biologist and construction contractor shall ensure that the fence is maintained effectively for the duration of the project. If exit/entries to the enclosed areas are required, they shall be closed at the end of work each day to ensure exclusion of CRLF overnight. Page 11 of 23 August 23, 2017 Erosion control structures shall not include plastic or be of types that may entrap wildlife and shall be constructed of tightly woven natural fibers. All construction activities shall cease one half hour before sunset and shall not begin prior to one half hour before sunrise. Additionally, construction activities shall not occur during rain events or within 24 hours of events projected to deliver >0.2 inches 'of rain or within 24 hours after rain events exceeding 0.2 inches in measureable precipitation, as CRLF are most likely to disperse during periods of precipitation. No work shall occur after 0.5 inches of rain has occurred after November 1 in the year work is occurring. Any open holes or trenches shall be covered or have escape ramps no steeper than 45 degrees installed at the end of each working day to prevent CRLF from becoming entrapped. With the implementation of these measures and those described for special -status fish (13IO-7), any impacts to CRLF shall be avoided. Mitigation Measure BIO -S: Pacific pond turtle Prior to the initiation of Project work in the reservoir or banks of the reservoir, a qualified biologist shall conduct a preconstruction survey for pond turtles. If a pond turtle is found during surveys, the qualified biologist will relocate it outside of the Study Area, out of harm's way or it shall be allowed to move out of the area under its own power. With the implementation of these measures and those previously described for CRLF (13I0-7) and aquatic habitats (BIO -1 and 13I0-2) (exclusion fence, work windows etc.), the impacts to Pacific pond turtle will be less than significant. V. CULTURAL RESOURCES: Would the project: a) Cause a substantial adverse change in the significance of a historical resource as defined in §15064.5? b) Cause a substantial adverse change in the significance of an archaeological resource pursuant to §15064.5? c) Directly or indirectly destroy a unique paleontological resource or site or unique geologic feature? d) Disturb any human remains, including those interred outside of dedicated cemeteries? Discussion: No impact, no project specific mitigation necessary. VI. GEOLOGY AND SOILS: would the project: a) Expose people or structures to potential substantial adverse effects, including the risk of loss, injury, or death involving: i) Rupture of a known earthquake fault, as delineated on the most recent Alquist-Priolo Earthquake Fault Zoning Map issued by the State Geologist for the area or based on other substantial evidence of a known fault? Refer to Division of Mines and Geology Special Publication 42? Strong seismic ground shaking? iii) Seismic -related ground failure, including liquefaction? Page 12 of 23 August 23, 2017 Potentially Less Than Less Than No Impact Significant Significant Significant Impact with Impact Mitigation iv) Landslides? LJ LJ ® LJ b) Result in substantial soil erosion or the loss of topsoil? c) Be located on a geologic unit or soil that is unstable, or that would become unstable as a result of the project, and potentially result in on- or off-site landslide, lateral spreading, subsidence, liquefaction or collapse? d) Be located on expansive soil, as defined in Table 18-1-B of the Uniform Building Code (1994), creating substantial risks to life or property? e) Have soils incapable of adequately supporting the use of septic tanks or alternative waste water disposal systems where sewers are not available for the disposal of waste water? Discussion: The primary intent of the City's proposed project is to increase flow capacity along the Petaluma River along the Corona Road Bridge, as well as, reduce the depth and frequency of localized flooding, by detaining peak flows in Detention Basins along the reach. This project will require site grading and excavation, which will disrupt the soils on site and will cause a substantive change in topography. The engineer's estimate for earthwork calculations includes approximately 22,000 cubic yards of cut. It is intended that the cut materials will be off -hauled to an appropriate site not subject to flood inundation. Implicit in the project's design are features to prevent negative impacts to the area such as the creation of unstable conons, erosion of ansoils, siltation, or mocations to co low -flow channel. The project will be designed such that all slopes shall be within the acceptable range of being within a stable condition. In the case that a stable condition cannot be created, proper mitigation efforts, such as installation of rip -rap will be performed to properly secure the site. The alluvial soils that occur within the project area along the Denman Reach consist of deep deposits of fine silts and clays, belonging to the Clear Lake Clay soil series. These soils are highly expansive, although not highly erosive. Soils conditions associated with the vegetation management component of the project will not be affected by trimming and pruning of vegetation in the Petaluma River. Minor soil disturbance may occur as part of exotic vegetation removal, but would be completed under conditions of the Streambed Alteration Agreement with erosion control measures and scheduling during low flow conditions, when significant rainfall is highly unlikely. General grading completed along the floodplain terrace, an d not within the channel, will be completed in compliance with conditions of the State Water Resources Control Board General Permit. The proposed Denman Reach Phase 4 project does not include construction of housing, commercial buildings, or related structures that would expose people to risk from seismic rupture, shaking, or secondary effects. The geotechnical report prepared for the City's Denman Phases 1 and 2 projects did not indicate any special geologic hazards associated with this area; no additional analysis has been undertaken. No structures are proposed as part of the project. Page 13 of 23 August 23, 2017 .XE -10 All provisions of the City of Petaluma Grading Ordinance, the project plans, and the project geotechnical report prepared for Phases 1 and 2 will be followed. Finished grades will not be steeper than 2H:1 V. GEO-2: +U , including grading and fill placement will only occur between the period of June 1 and October 15. All disturbed areas will be stabilized upon final grading and protected using a combination of permanent vegetative treatment, mulching, geotextiles, as shown in the project Erosion Control Plan (ECP) to be included in the grading plans. In addition, the selected construction Contractor will be required to develop a SWPPP (subject to City approval) and implement the Plan. The City's Project Manager will monitor (and document) to insure that the ECP and SWPPP and other provisions of the approved improvement plans are being followed. GEO-3: Site grubbing and earthmoving activities will be completed prior to October 15 of the construction year. Work beyond October 15 (with the exception of revegetation until November 15) shall be specifically authorized in advance by the appropriate regulatory agencies. All erosion control shall meet specifications of the City of Petaluma Erosion Control Ordinance. Erosion control and sediment detention devices shall be incorporated into the project design and implemented at the time of construction. These devices shall be in place prior to October 15 and the onset of rains for the purposes of minimizing fine sediment and sediment/water slurry input to flowing water, and of detaining water to retain sediment on-site. These devices will be placed at all locations where the likelihood of sediment input exists. Sediment collected in these devices shall be disposed of away from the collection site and outside riparian areas and flood hazard areas. VII. GREENHOUSE GAS EMISSIONS: Would the project: a) Generate greenhouse gas emissions, either directly or indirectly, that may have a significant impact on the environment? b) Conflict with an applicable plan, policy or regulation adopted for the purpose of reducing the emissions of greenhouse gases? Caltrans has used the best available information based to the extent possible on scientific and factual information, to detedescribe, calculate, or estimate the amount of greenhouse gas emissions that may occur related to this project. The analysis included in the climate change section of this document provides the public and decision -makers as much information about the project as possible. It is Caltrans' rmination that in the absence of statewide -adopted thresholds or GHG emissions limits, it is too speculative to make a significance determination regarding an individual project's direct and indirect impacts with respect to global climate change. Caltrans remains committed to implementing measures to reduce the potential effects of the project. These measures are outlined in the climate change section of the document. Discussion: No impact, no project specific mitigation necessary VIII. HAZARDS AND HAZARDOUS MATERIALS: Potentially Would the project: Significant Impact a) Create a Less significan+6 eA to the public or the environment ❑ through the routine transport, use, or disposal of hazardous materials? b) Create a significant hazard to the public or the environment ❑ through reasonably foreseeable upset and accident conditions involving the release of hazardous materials into the environment? Page 14 of 23 August 23, 2017 Than Less Than No Impact Significant Significant with Impact Mitigation c) Emit hazardous emissions or handle hazardous or acutely hazardous materials, substances, or waste within one-quarter He of an existing or proposed school? d) Be located on a site which is included on a list of hazardous materials sites compiled pursuant to Government Code Section 65962.5 and, as a result, would it create a significant hazard to the public or the environment? e) For a project located within an airport land use plan or, where such a plan has not been adopted, within two miles of a public airport or public use airport, would the project result in a safety hazard for people residing or working in the project area? f) For a project within the vicinity of a private airstrip, would the project result in a safety hazard for people residing or working in the project area? g) Impair implementation of or physically interfere with an adopted emergency response plan or emergency evacuation pIan? h) Expose people or structures to a significant risk of loss, injury or death involving wildland fires, including where wildlands are adjacent to urbanized areas or where residences are intermixed vrith wildlands? Discussion: No impact, no project specific mitigation necessary. IX. HYDROLOGY AND WATER QUALITY: Would Potentially Less Than Less Than No the project: Significant Significant Significant Impact Impact with Impact Mitigation a) Violate any water quality standards or waste discharge requirements? b) Substantially deplete groundwater supplies or interf ere substantially with groundwater recharge such that there would be a net deficit in aquifer volume or a lowering of the local groundwater table level (e.g., the production rate of pre-existing nearby wells would drop to a level which would not support existing land uses or planned uses for which permits have been granted)? c) Substantially alter the existing drainage pattern of the site or area, including through the alteration of the course of a stream or river, in a manner which would result in substantial erosion or siltation on- or off-site? M F1 F1 d) Substantially alter the existing drainage pattern of the site or area, including through the alteration of the course of a stream or river, or substantially increase the rate or amount of surface runoff in a manner which would result in flooding on- or off-site? e) Create or contribute runoff water which would exceed the capacity of existing or planned stormwater drainage systems or provide substantial additional sources of polluted runoff? f) Otherwise substantially degrade water quality? Page 15 of 23 August 23, 2017 g) Place housing within a 100 -year flood hazard area as mapped on a federal Flood Hazard Boundary or Flood Insurance Rate Map or other flood hazard delineation map? h) Place within a 100 -year flood hazard area structures which would impede or redirect flood flows? i) Expose people or structures to a significant risk of loss, injury or death involving flooding, including flooding as a result of the failure of a levee or dam? j) Inundation by seiche, tsunami, or mudflow Page 16 of 23 August 23, 2017 ❑ ❑ ❑ ONI Discussion: The installation of detention basins at Denman Reach and the removal of sediment around the Corona Bridge to return the Petaluma River to its original section will alter the existing hydrology and drainage patterns of the Denman Reach Phase 4 project site. However, the project's intent is to improve surface water capacity and conveyance and reduce localized flooding within the project area and its immediate surroundings while not creating any increased impact to downstream storm flow conditions. According to the analysis performed by WEST Consultants, Inc., using 25- and 100 -year rainfall events, model runs revealed that the detention basins, alone, provided some water surface elevation reduction through the Denman Reach area with lesser reductions downstream, and the Corona Road sediment removal, itself, provided a larger water surface reduction in the area of Corona Road, but suffered from slightly increased levels downstream. Combined, however, the negative expected impacts downstream are eliminated for the 100 -year event with a net result of decreased peak flow and water surface elevations. For the 25 -year event, there is still a slight increase in water surface elevation downstream of the Corona bridge, gradually increasing to a maximum increase of 0.1 feet near the constriction weir, and then decreasing again from that point down to zero increase near Adobe Creek. The reason for the increase during the 25 -year event is due to the lower utilization of the detention basins for the smaller event, however changes to the weir elevations were not recommended due to the benefits achieved of the 100 -year event. The installation of detention basins and removal of excess sediment and vegetation will enhance conveyance of floodwaters and reduce the frequency and depth of periodic out -of --bank flooding during lower intensity storm events. Understory vegetation and exotic invasive species will be selectively removed, while canopy will remain and continue to provide cover and cool water temperatures. HYD -1: A detailed Storm Water Pollution Prevention Plan (SWPPP) shall be prepared and implemented by the Contractor, subject to review and approval of the City of Petaluma, as aline item in the construction agreement. Construction plans should specify all erosion and sediment control measures that will be used, including (where applicable): • Limiting access route to the creek channel and stabilizing access points; • Stabilizing graded areas as soon as possible with seeding, mulching, erosion control materials or other effective methods; • Delineating clearing limits, easements, setbacks, sensitive areas, vegetation and drainage courses by marking them in the field; • Stabilizing and preventing erosion from temporary conveyance channels and outlets; • If rainfall di occurs, using sement controls and filtration to remove sediment from water collected on-site during construction. HYD -2: Implement established Best Management Practices (BMPs) to control short-term construction water quality impacts. Construction BMPs will reduce erosion of disturbed soils during construction activities, an d are used to minimize wind and water erosion and transport of sediments during construction. BMPs shall include as a minimum the following measures: • Temporary meas ures, such as flow diversion, temporary ditches, and silt fencing. • Surface disturbance of soil and vegetation would be kept to a minimum. • Any stockpiled soil, awaiting removal from the site, would be placed and sloped so that it would not be subject to accelerated erosion. Page 17 of 23 August 23, 2017 HYD -3: Conformance with the State Water Resources Control Board Construction General Permit, including implementation of a Storm Water Pollution Prevention Plan (SWPPP) and the Sonoma County Water Agency (SCWA) Stream Maintenance Program Guidelines, which include Best Management Practices. The BMPs cover selective vegetation management, including use of herbicides and other chemicals. HYD -4: Incorporate potentially hazardous materials storage and handling plan into the overall Streambed Alteration Agreement. Provisions will include, but not be limited to the following: • Refueling outside the riparian corridor with measures for containing accidental fuel spills. • All construction equipment and machinery shall be checked for leaks prior to entry into the stream channel • Any construction equipment shall not be stored or stockpiled in the creek channel. • No herbicide application in or near flowing water, and all herbicides shall be applied under the direction of a licensed Pest Control Applicator, and in accordance with appropriate regulations. X. LAND USE AND PLANNING: Would the project: Potentially Less Than Less Than No Significant Significant Significant Impact Impact with Impact Mitigation a) Physically divide an established community? El b)Conflict with any applicable land use plan, policy, or regulation of an agency with jurisdiction over the project (including, but not limited to the general plan, specific plan, local coastal program, or zoning ordinance) adopted for the purpose of avoiding or mitigating an environmental effect? c) Conflict with any applicable habitat conservation plan or natural community conservation plan? Discussion: The properties within the project area are designated as Business Park and/or Floodway by the General Plan 2025 Land Use Map. Zoning designations include Planned Community District and Floodway on a portion of each parcel with an overlay of Floodplain Combining District. The City of Petaluma has previously implemented three phases of restoration projects in the vicinity of the project site pursuant to the Petaluma River Access and Enhancement Plan (River Plan). Adopted in May 1996, the River Plan addresses the impact of urban growth and development within the watershed upon the hydrology and health of the Petaluma River. The actions outlined in the River Plan intend to increase channel capacity and reduce the amount of impeivious surface within the River's floodway and floodplain through acquisition of significant properties and through the creation and/or restoration of riparian buffer zones, flood terraces, and seasonal wetlands. In addition to restoration and management, the River Plan outlines the need for public access to and along the riverftont. XI. MINERAL RESOURCES: Would the project: Potentially Less Than Significant Significant Impact v�ith Mitigation Page 18 of 23 August 23, 2017 Less Than No Significant Impact Impact a) Result in the loss of availability of a known mineral resource Li ❑ that would be of value to the region and the residents of the state? b) Result in the loss of availability of alocally-important mineral resource recovery site delineated on a local general plan, LJ Lj Li LN specific plan or other land use plan? Discussion: No impact, no project specific mitigation necessary. XII. NOISE: Would the project result in: Potentially Less Than Less Than No Significant Significant Significant Impact Impact with Impact Mitigation a) Exposure of persons to or generation of noise levels in excess of standards established in the local general plan or noise ordinance, or applicable standards of other agencies? b) Exposure of persons to or generation of excessive groundborne vibration or groundbome noise levels? c) A substantial permanent increase in ambient noise levels in the project vicinity above levels existing vvithout the project? d) A substantial temporary or periodic increase in ambient noise levels in the project vicinity above levels existing without the project? e) For a project located within an airport land use plan or, where such a plan has not been adopted, within two miles of a public airport or public use airport, would the project expose people residing or working in the project area to excessive noise levels? fl For a project within the vicinity of a private airstrip, would the project expose people residing or working in the project area to excessive noise levels? Discussion: The grading an d construction activities associated with the City's Petaluma River Flood Management Denman Phase 4 Project will represent ashort-term increase in noise levels within the immediate project area. Use of chain -saws and brush chippers associated with the project will also increase noise levels during the clearing and grubbing period around the Corona Bridge. The long-term passive recreational nature of the proposed project will have no significant effect on area noise levels. The following mitigation measures will be implemented to minimize short-term noise related impacts to less than significant. 40ISE4 : Temporary noise impacts will be limited by restricting construction activities to daylight hours: weekdays from 7:00 am to 7:00 pm, and Saturdays 9:00 am to 5:00 pm, with no work on Sundays. This shall exceed standards of the City of Petaluma Noise Ordinance which specifically prohibits construction activity between the hours of 10:00 p.m. and 7:00 a.m. Monday through Friday, and between 10:00 p.m. and 9:00 a.m. on Saturdays, Sundays, and State,'Federal, or local holidays. NOISE -2: Require hearing protection for workers operating, and in close proximity to, heavy machinery, including chainsaws, brush mowers, and weed trimmers in accordance with CFR 29, Part 1910.95 and OSHA standards. Page 19 of 23 August 23, 2017 XIII. POPULATION AND HOUSING: Would the Potentially Less Than Less Than No project: Significant Significant Significant Impact Impact with Impact Mitigation a) Induce substantial population growth in an area, either directly (for example, by proposing new homes and businesses) or indirectly (for example, through extension of roads or other infrastructure)? b) Displace substantial numbers of existing housing, necessitating the construction of replacement housing elsewhere? c) Displace substantial numbers of people, necessitating the construction of replacement housing elsewhere? Discussion: No impact, no project specific mitigation necessary. (IV. PUBLIC SERVICES: a) Would the project result in substantial adverse physical Potentially Less Than Less Than No impacts associated with the provision of new or physically Significant Significant Significant Impact altered governmental facilities, need for new or physically Impact with Impact altered governmental facilities, the construction of which could Mitigation cause significant environmental impacts, in order to maintain acceptable service ratios, response times or other performance objectives for any of the public services: Fire protection? Police protection? Schools? ❑ Parks? ❑ F-1 F1 F1 17 Other public facilities? Discussion: No impact, no project specific mitigation necessary. XV. RECREATION: Potentially Less Than Less Than No Significant Significant Significant Impact Impact with Impact Mitigation Page 20 of 23 August 23, 2017 a) Would the project increase the use of existing neighborhood Li Liand regional parks or other recreational facilities such that Li le L1\1 substantial physical deterioration of the facility would occur or be accelerated? b) Does the project include recreational facilities or require the ❑ ® ❑ ❑ construction or expansion of recreational facilities which might have an adverse physical effect on the environment? Discussion: The project is consistent with the City's recreational goals and objectives, particularly regarding those recreational goals and objectives outlined in the General Plan 2025 and the River Plan. The project will improve upon existing conditions for recreation by providing additional links to the City's riverfront trail system. The additional trails will have a minor impact on the environment which will be mitigated through measures presented in other This is a beneficial impact. XVI. TRANSPORTATION/TRAFFIC: Would the Potentially project: Significant Impact a) Conflict vrith an applicable plan, ordinance or policy ❑ establishing measures of effectiveness for the performance of the circulation system, taking into account all modes of transportation including mass transit and non -motorized travel and relevant components of the circulation system, including but not limited to intersections, streets, highways and freeways, pedestrian and bicycle paths, and mass transit? b) Conflict with an applicable congestion management program, ❑ including, but not limited to level of service standards and travel demand measures, or other standards established by the county congestion management agency for designated roads or highways? c) Result in a change in air traffic patterns, including either an increase in traffic levels or a change in location that results in substantial safety risks? d) Substantially increase hazards due to a design feature (e.g., sharp curves or dangerous intersections) or incompatible uses (e.g., farm equipment)? e) Result in inadequate emergency access? f) Conflict with adopted policies, plans or programs regarding public transit, bicycle, or pedestrian facilities, or otherwise decrease the performance or safety of such facilities? Discussion: No impact, no mitigation necessary. XVII. TRIBAL CULTURAL RESOURCES: Would the project cause a substantial adverse change in the significance of a tribal cultural resource, defined in Public Resources Code section 21074 as either a site, feature, place, cultural landscape that is geographically defined in terms of the size and scope of the landscape, sacred place, or object with cultural value to a California Native American tribe, and that is: Page 21 of 23 August 23, 2017 u -I Potentially Significant Impact Less Than Significant with Mitigation ISI U u ISI U Less Than Significant with Mitigation Less Than No Sficant Impact Impact U u ISI Less Than Significant Impact No Impact a) Listed or eligible for listing in the California Register of Historical Resources, or in a local register of historical resources Ll Ll Li ILI as defined in Public Resources Code section 5020.1(k), or b) A resource determined by the lead agency, in its discretion LWJ L.J ❑ LN and supported by substantial evidence, to be significant pursuant to criteria set forth in subdivision (c) of Public Resources Code Section 5024.1. In applying the criteria set forth in subdivision (c) of Public Resource Code Section 5024.1, the lead agency shall consider the significance of the resource to a California Native American tribe. Discussion: No impact, no mitigation necessary. XVIII. UTILITIES AND SERVICE SYSTEMS: would Potentially Less Than Less Than No the project: Significant Significant Significant Impact Impact with Impact Mitigation a) Exceed wastewater treatment requirements of the applicable Regional Water Quality Control Board? b) Require or result in the construction of new water or wastewater treatment facilities or expansion of existing facilities, the construction of which could cause significant environmental effects? c) Require or result in the construction of new storm water drainage facilities or expansion of existing facilities, the construction of which could cause significant environmental effects? d) Have sufficient water supplies available to serve the project from existing entitlements and resources, or are new or expanded entitlements needed? e) Result in a determination by the wastewater treatment provider which serves or may serve the project that it has adequate capacity to serve the project's projected demand in addition to the provider's existing commitments? F1 F] F1 r7i f) Be served by a landfill with sufficient permitted capacity to accommodate the project's solid waste disposal needs? g) Comply with federal, state, and local statutes and regulations related to solid waste? Discussion: The City's water system already serves the project area. Water deman d will be limited to the establishment and maintenance of new plant materials. There will be no turf, and plantings will be drought tolerant natives, or selected based on their proximity to the creek -side planting zone and its natural moisture regime. The project's primary goal is providing for improved storm water drainage both regarding quantity of runoff capacity and water quality. XIX. MANDATORY FINDINGS OF Potentially Less Than SIGNIFICANCE Significant Significant Impact with Mitigation Page 22 of 23 August 23, 2017 Less Than No Significant Impact Impact a) Does the project have the potential to degrade the quality of Li LI LI ILI the environment, substantially reduce the habitat of a fish or wildlife species, cause a fish or wildlife population to drop below self-sustaining levels, threaten to eliminate a plant or animal community, substantially reduce the number or restrict the range of a rare or endangered plant or animal or eliminate important examples of the major periods of California history or prehistory? b) Does the project have impacts that are individually limited, but cumulatively considerable? ("Cumulatively considerable" means that the incremental effects of a project are considerable when viewed in connection with the effects of past projects, the effects of other current projects, and the effects of probable future projects)? c) Does the project have environmental effects which vrill cause substantial adverse effects on human beings, either directly or indirectly? Discussion: No impact, no mitigation necessary. Attachments: I. Biological Resource Assessment II. Hydraulic Analysis Page 23 of 23 August 23, 2017 r - Fc�= J�- '�• _ t J ry Cr_ List of Preparers Doug Spicher- Principal -in -charge Bianca Clarke- Project Manager Scott Yarger- Lead Biologist Brian Freiermuth — Wildlife Biologist Rhiannon Korhummel — Plant Biologist Scott Mortensen- GIS Analysist 704WWW7ENVOWW1"0Mt" Wbi LIST OF APPENDICES............................................................................................................... 1.0 INTRODUCTION...................................................................................................................1 2.0 REGULATORY BACKGROUND...........................................................................................1 2.1 Sensitive Biological Communities. I I I I I I I I I I I I I I I a I I d 0 a a 0 a 9 0 0 a 0 9 1 a 0 * 0 0 * a a a a S 0 0 a a 9 0 9 0 9 a 4 * a * a D a 0 4 0 a D 9 * a F a a * a a 0 0 0 0 0 0 1 1 2.1.1 Waters of the United States.............................................................................1 2.1 .2 Waters of the State..........................................................................................4 2,1 m3 Streams, Lakes, and Riparian Habitat..............................................................4 2.1.4 Essential Fish Habitat......................................................................................5 2.1.5 Other Sensitive Biological Communities..........................................................5 2.1.6 Relevant Local Policies, Ordinances, and Regulations....................................5 2.2 Special -Status Species..............", Pat 11 "ONES MESON ENROMEM, EDEN EDEN a a 0 a * NO a a * a a a a so so 0 a a 0 0 0 4 0 * a 0 * a & 0 ''6 3.0 METHODS.............................................................................................................................7 3.1 Biological Communities................................................................................................7 3.1.1 Non -sensitive Biological Communities.............................................................8 3.1.2 Sensitive Biological Communities. * h I t a a 1 9 0 0 * 0 0 0 a a 0 9 a a a 0 0 a a 0 a * * 0 B 0 0 a a a 9 0 0 0 * a * 0 a a a a 0 9 a I a 0 0 a 0 a a 4 0 0 0 a 0 a d 8 3.2 Special -Status Species................. Ems NONE 9*60MESMOUP ORWORKEN ...................................................... 8 3.2.1 Literature Review.............................................................................................8 3.2.2 Site Assessment..............................................................................................9 4.0 RESULTS............................................................................................................................10 4.1 Study Area Description, S I I I I I I I I I I I I I I I I I I I I I I I I I I I I . . . . . . . a , 0 , 6 a a a 0 1 4 a & a a a a a 0 0 A a 0 a d a a 0 2 0 0 0 a 0 0 9 0 a 0 0 0 0 a a 0 * 0 * m 9 * 0 * a 0 a 0 9 1 U 4.2 Biological Communities..............................................................................................10 4.2.2 Sensitive Biological Communities. MORRIS Pat', 4 4.3 Special -Status Species.,............. a a 0 of on 0 0 0 0 a so ff 0 P 4 F 0 a 0 0 0 0 0 0 a . . . . . . . . . . . . . . . . . . . . . . . . . . . . K , K , K . . . . . . . . . . . . K . . . K 1 5 4.3.1 Special -Status Plant Species.........................................................................15 4.3.2 Special -Status Wildlife...................................................................................20 4.3.3 Listed Wildlife Species Unlikely to Occur in the Study Area ..........................27 5.0 POTENTIAL IMPACTS, AVOIDANCE, MINIMIZATION, AND MITIGATION MEASURES .30 5.1 Project Description......................................................................................................30 5.2 Significance Threshold Criteria, I I I I I I I I a D I a h a 6 0 a & a 1 0 0 * 0 0 0 0 0 0 0 0 a 9 0 a 0 1 a 9 a 0 0 9 9 a a 0 B 0 0 a 0 0 * a 0 0 a a 9 * 9 0 0 0 0 a 0 9 9 0 0 a a * a 0 a 0 * * 0 0 30 5.3 Potentially Significant Impacts, I I I I I a * h a * a I h a * 0 d a 0 0 0 a a 0 0 a 0 * 0 0 0 a * 0 0 0 a 0 B S 0 0 * 9 a a 9 a 0 0 a 0 9 a a & 9 0 a 9 a * a 9 0 0 a a 9 a 0 a a 0 0 a 0 a 0 * 0 * W31 5.3.1 Biological Communities..................................................................................31 5.3.2 Special -status Plant Species... saaamn 900060assaw moose* 33 5.3.3 Special -status Wildlife Species......................................................................34 6.0 REFERENCES....................................................................................................................39 LIST OF FIGURES Figure 1. Study Area Location Map..............................................................................................2 Figure 2. Biological Communities within the Study Area............................................................11 Figure 3. Special -Status Plant Species within 5 Miles of the Study Area...................................16 Figure 4, Special -Status Wildlife Species within 5 Miles of the Study Area, 9 1 P 4 1 F I * 0 1 a I I I P 4 F 1 4 1 4 a 9 W F 0 * 2 1 LIST OF APPENDICES Appendix A —List of Observed Plant and Wildlife Species Appendix B — Potential for Special -status Plant and Wildlife Species to Occur in the Study Area Appendix C — Representative Study Area Photographs iii 1.0 INTRODUCTION On November 15, 2017 and December 29, 2017 WRA, Inc. (WRA) performed a biological resources assessment at the proposed Denman Reach Phase IV Flood Control Project, situated on Denman Reach of the Petaluma River in northern Petaluma, Sonoma County, California (Study Area). The Study Area is located 2.25 miles northwest of downtown Petaluma (Figure 1). The Study Area is composed of two publicly -owned properties totaling approximately 5.9 acres. The purpose of this assessment is to gather information necessary to complete a review of biological resources under the California Environmental Quality Act (CEQA). This report describes the results of the site visit, which assessed the Study Area and immediately adjacent areas for: (1) the potential to support special -status plant and wildlife species; (2) the potential presence of sensitive biological communities such as wetlands or riparian habitats; and (3) the potential presence of other sensitive biological resources protected by local, state, and federal laws and regulations. A BRA provides general information on the potential presence of sensitive species and habitats. The BRA is not an official protocol -level survey for listed species that may be required for project approval by local, state, or federal agencies. Our determinations regarding the potential of the Study Area to support special -status plant and wildlife species were based primarily on the suitability of habitats within the Study Area, the proximity of known occurrences, and an on-site inspection and survey results. This assessment is based on information available at the time of the study and on site conditions that were observed on November 15, 2017 and December 29, 2017. A delineation of Waters of the U.S. ("waters") subject to the U.S. Environmental Protection Agency (EPA) and U.S. Army Corps of Engineers (Corps) jurisdiction under Section 404 of the Clean Water Act (CWA) and Regional Water Control Board jurisdiction under Section 401 of the CWA, as well as stream and riparian areas subject to California Department of Fish and Wildlife (CDFW) jurisdiction under Section 1602 of California Fish and Game Code (CFGC), was conducted concurrently with this assessment, and the results of that assessment areprovided in a separate report. 2.0 REGULATORY BACKGROUND The following sections explain the regulatory context of this Biological Resources Assessment, including applicable laws and regulations that informed field investigations. 2.1 Sensitive Biological Communities Sensitive biological communities include habitats that fulfill special functions or have special values, such as wetlands, streams, or riparian habitat. These habitats are protected under federal regulations such as the CWA; state regulations such as the Porter -Cologne Act, Section 1600- 1616 of the California Fish and Game Code (CFGC), CEQA; or local ordinances or policies such as city or county tree ordinances, Special Habitat Management Areas, and General Plan Elements. 2.1.1 Waters of the United States The Corps regulates "Waters of the United States" under Section 404 of the CWA. Waters of the U.S. are defined in the Code of Federal Regulations (CFR) as waters susceptible to use in 1 Penn'yove a 'I ry Gnni:v�n n AVIP Pr•rdlumr Rrru !t ` i • ,f�k kdln$vllle,lid r� ;.3 � I h NL' _ a Study sl:0111 an art ra+wr Saint Henna lie Santa Rosa Yovn tville Iegasay , Dommot -Q = Robn"t P,mk plings apa Senbnu jr Petr. 40.•H6YdtD 6a Vallejo a. Beni - � r' Herculcf e��1� Pindt.'.': —`tn •.- - San Rafael •. El SON su5,e• MiIlZailey It serkifry - It It I orrvida III oaklagd ` Nl regr C, San Francisco' olvb� fYy nt`M 0/yf0 rn P,}ssT.r G:un r�llf All: rl r�. C,11 s 'v g sdn tea r . v oalycity '•nwis.n - lnarimanlr� araoduo Ht' - J PeafiSa'- - a Sources: National Geographic, WRA I Prepared By: smortensen, 1/11/2018 Figure 1. Study Area Location Petaluma 61 Denman Reach N 0 o.s 1 n Petaluma, California - - Miles %� ENVIRONMENTAL CON5ULTAIJ iS CYPess Hills ,_� ,:_ Cemecery E (ltip g G f g sdn tea r . v oalycity '•nwis.n - lnarimanlr� araoduo Ht' - J PeafiSa'- - a Sources: National Geographic, WRA I Prepared By: smortensen, 1/11/2018 Figure 1. Study Area Location Petaluma 61 Denman Reach N 0 o.s 1 n Petaluma, California - - Miles %� ENVIRONMENTAL CON5ULTAIJ iS This Page Intentionally Left Blank. 3 commerce, including interstate waters and wetlands, all other waters (intrastate waterbodies, including wetlands), and their tributaries (33 CFR 328.3). Potential wetland areas, according to the three criteria used to delineate wetlands as defined in the Corps of Engineers Wetlands Delineation Manual (Environmental Laboratory 1987), are identified by the presence of (1) hydrophytic vegetation, (2) hydric soils, and (3) wetland hydrology. Areas that are inundated at a sufficient depth and for a sufficient duration to exclude growth of hydrophytic vegetation are subject to Section 404 jurisdiction as "other waters" and are often characterized by an ordinary high water mark (OHWM), and herein referred to as non -wetland waters. Non -wetland waters, for example, generally include lakes, rivers, and streams. The placement of fill material into Waters of the U.S. generally requires an individual or nationwide permit from the Corps under Section 404 of the CWA. 2.1.2 Waters of the State The term "Waters of the State" is defined by the Porter -Cologne Act as "any surface water or groundwater, including saline waters, within the boundaries of the state." The Regional Water Quality Control Board (RWQCB) protects all waters in its regulatory scope and has special responsibility for wetlands, riparian areas, and headwaters. These aquatic resources have high resource value, are vulnerable to filling, and may not be systematically protected by other programs. RWQCB jurisdiction includes wetlands and waters that may not be regulated by the Corps under Section 404, such as isolated wetlands. Waters of the State are regulated by the RWQCB under the State Water Quality Certification Program which regulates discharges of fill and dredged material under Section 401 of the CWA and the Porter -Cologne Water Quality Control Act. Projects that require a Corps permit or fall under other federal jurisdiction and have the potential to impact Waters of the State are required to comply with the terms of the Water Quality Certification determination. If a proposed project does not require a federal permit but does involve dredge or fill activities that may result in a discharge to Waters of the State, the RWQCB has the option to regulate the dredge and fill activities under its state authority in the form of Waste Discharge Requirements. 2.1.3 Streams, Lakes, and Riparian Habitat Streams and lakes, as habitat for fish and wildlife species, are subject to jurisdiction by CDFW under Sections 1600-1616 of California Fish and Game Code. Alterations to or work within or adjacent to streambeds or lakes generally require a 1602 Lake and Streambed Alteration Agreement. The term "stream", which includes creeks and rivers, is defined in the California Code of Regulations (CCR) as "a body of water that flows at least periodically or intermittently through a bed or channel having banks and supports fish or other aquatic life [including] watercourses having a surface or subsurface flow that supports or has supported riparian vegetation" (14 CCR 1.72). In addition, the term "stream" can include ephemeral streams, dry washes, watercourses with subsurface flows, canals, aqueducts, irrigation ditches, and other means of water conveyance if they support aquatic life, riparian vegetation, or stream -dependent terrestrial wildlife (CDFG 1994). "Riparian" is defined as "on, or pertaining to, the banks of a stream." Riparian vegetation is defined as "vegetation which occurs in and/or adjacent to a stream and is dependent on, and occurs because of, the stream itself' (CDFG 1994). Removal of riparian vegetation also requires a Section 1602 Lake and Streambed Alteration Agreement from CDFW. 2.1.4 Essential Fish Habitat Essential Fish Habitat (EFH) is regulated through the National Marine Fisheries Service (NMFS), a division of the National Oceanic and Atmospheric Administration (NOAA). Protection of EFH is mandated through changes implemented in 1996 to the Magnuson -Stevens Fishery Conservation and Management Act (Magnuson -Stevens Act) to protect the loss of habitat necessary to maintain sustainable fisheries in the United States. The Magnuson -Stevens Act defines EFH as "those waters and substrate necessary to fish for spawning, breeding, feeding, or growth to maturity" [16 USC 1802(10)]. NMFS further defines essential fish habitat as areas that "contain habitat essential to the long-term survival and health of our nation's fisheries" (NMFS 2007). EFH can include the water column, certain bottom types such as sandy or rocky bottoms, vegetation such as eelgrass or kelp, or structurally complex coral or oyster reefs. Under regulatory guidelines issued by NMFS, any federal agency that authorizes, funds, or undertakes action that may affect EFH is required to consult with NMFS (50 CFR 600.920). 2.1.5 Other Sensitive Biological Communities Other sensitive biological communities not discussed above include habitats that fulfill special functions or have special values. Natural communities considered sensitive are those identified by the CDFW in local or regional plans, policies, or regulations. The CDFW ranks sensitive communities as "threatened" or "very threatened" and keeps records of their occurrences in its California Natural Diversity Database (CNDDB; CDFW 2017). Sensitive plant communities are aIso identified by CDFW (2017) and CNPS (2017a). Vegetation alliances are ranked 1 through 5 by CNDDB based on NatureServe's (2017) methodology, with those alliances ranked globally (G) or statewide (S) as 1 through 3 considered sensitive. Impacts to sensitive natural communities identified in local or regional plans, policies, or regulations or those identified by the CDFW or United States Fish and Wildlife Service (USFWS) must be considered and evaluated under CEQA (CCR Title 14, Div, 6, Chap, 3, Appendix G). Specific habitats may also be identified as sensitive in city or county general plans or ordinances. 2.1 .6 Relevant Local Policies, Ordinances, and Regulations City of Petaluma Tree Ordinance The City of Petaluma recognizes the aesthetic, environmental, and economic benefits mature trees provide to the citizens of the City. Chapter 17, "Tree Preservation" of the Petaluma City Code (Tree Ordinance) regulates the protection of certain trees on public and private properties within the City limits. The Tree Ordinance defines a "protected tree" as: California native oaks (Quercus spp.) 4 inches diameter or greater measured at 4.5 above grade ("diameter at breast height" or DBH), California buckeye (Aesculus californica) 6 inches DBH or greater, California bay (Umbellularia californica) 12 inches DBH or greater, coast redwood (Sequoia sempervirens) 18 inches DBH or greater, heritage trees as approved by Council resolution per Title 8 of the Petaluma Municipal Code, significant groves or stands of trees, trees located in riparian corridors, any tree required to be planted or preserved as mitigation or condition of approval for a discretionary development project, or trees in the public right-of-way. A permit is generally required for the removal of any protected tree. Conditions of approval may include tree replacement plantings or the payment of inAeu fees. y 2.2 Special -Status Species Plant and Wildlife Species Special -status species include those plants and wildlife species that have been formally listed, are proposed as endangered or threatened, or are candidates for such listing under the federal Endangered Species Act (ESA) or California Endangered Species Act (CESA). These acts afford protection to both listed species and species proposed for listing. In addition, CDFW Species of Special Concern, which are species that face extirpation in California if current population and habitat trends continue, USFWS Birds of Conservation Concern, and CDFW special -status invertebrates are all considered special -status species. Although CDFW Species of Special Concern generally have no special legal status, they are given special consideration under the CEQA. In addition to regulations for special -status species, most birds in the United States, including non -status species, are protected by the Migratory Bird Treaty Act (META) of 1918. Under this legislation, destroying active nests, eggs, and young is illegal. Plant species included within the California Native Plant Society (GNPs) Inventory of Rare and Endangered Plants (Inventory) with California Rare Plant Rank (Rank) of 1 and 2 are also considered special -status plant species and must be considered under CEQA. Very few Rank 3 or Rank 4 plant species meet the definitions of Section 1901 Chapter 10 of the Native Plant Protection Act or Sections 2062 and 2067 of the CDFW Code that outlines CESA. However, CNPS and CDFW strongly recommend that these species be fully considered during the preparation of environmental documentation relating to CEQA. This may be particularly appropriate for the type locality of a Rank 4 plant, for populations at the periphery of a species range or in areas where the taxon is especially uncommon or has sustained heavy losses, or from populations exhibiting unusual morphology or occurring on unusual substrates. A description of the CNPS Ranks is provided below in Table 1. Table 1. Description of CNPS Ranks and Threat Codes California Rare Plant Ranks (formerly known as CNPS Lists) Rank 1A Presumed extirpated in California and either rare or extinct elsewhere Rank 1 B Rare, threatened, or endangered in California and elsewhere Rank 2A Presumed extirpated in California, but more common elsewhere Rank 2B Rare, threatened, or endangered in California, but more common elsewhere Rank 3 Plants about which more information is needed - A review list Rank 4 Plants of limited distribution - A watch list Threat Ranks 0.1 Seriously threatened in California 0.2 Moderately threatened in California 0.3 Not very threatened in California D Critical Habitat Critical habitat is a term defined in the ESA as a specific geographic area that contains features essential for the conservation of a threatened or endangered species and that may require special management and protection. The ESA requires federal agencies to consult with the USFWS to conserve listed species on their lands and to ensure that any activities or projects they fund, authorize, or carry out will not jeopardize the survival of a threatened or endangered species. In consultation for those species with critical habitat, federal agencies must also ensure that their activities or projects do not adversely modify critical habitat to the point that it will no longer aid in the species' recovery. In many cases, this level of protection is similar to that already provided to species by the ESA jeopardy standard. However, areas that are currently unoccupied by the species but which are needed for the species' recovery are protected by the prohibition against adverse modification of critical habitat. affective 3.0 METHODS On November 15, 2017 and December 29, 2017 the Study Area was traversed on foot to determine (1) plant communities present within the Study Area, (2) if existing conditions provided suitable habitat for any special -status plant or wildlife species, and (3) if sensitive habitats are present. Additionally, a routine jurisdictional wetland delineation and delineation of streams and riparian areas was conducted concurrently with this site assessment. All plant and wildlife species encountered were recorded and are listed in Appendix A. Plants were identified using The Jepson Manual: Vascular Plants of California 2nd Edition (Baldwin et al. 2012), to the taxonomic level necessary to determine rarity. Plant nomenclature follows Baldwin et al. (2012) and subsequent revisions by the Jepson Flora Project (2017), except where noted. Because of recent changes in classification for many of the taxa treated by Baldwin et al, and the Jepson Flora Project, relevant synonyms are provided in brackets. For cases in which regulatory agencies, CNPS, or other entities base rarity on older taxonomic treatments, precedence was given to the treatment used by those entities. Special -status species with a potential for occurrence, determined based on field visits and habitat availability, are described in Appendix B. Representative photographs of the Study Area taken during field visits are included in Appendix C. 3.1 Biological Communities Prior to the site visit, the Soil Survey of Sonoma County, California (USDA1972, CSRL 2017) was examined to determine if any unique soil types that could support sensitive plant communities and/or aquatic features were present in the Study Area. In addition, we reviewed the Cotati United States Geological Survey (USGS) 7.5 -minute quadrangle topographic map (USGS 1980), the National Wetlands Inventory (NWI) (USFWS 2017a), and aerial photographs of the Study Area (Google Earth 2017) to identify potential sensitive habitats and areas for further investigation during the site visit. Following the site visit, biological communities present in the Study Area were classified based on existing plant community descriptions described in A Manual of California Vegetation, Online Edition (CNPS 2017a). However, in some cases it was necessary to identify variants of community types or to describe non -vegetated areas that are not described in the literature. Biological communities were classified as sensitive or non -sensitive as defined by CEQA and other applicable laws and regulations (see Section 2.1, above). 7 3M 1.1 Non -sensitive Biological Communities Non -sensitive biological communities are those communities that are not afforded special protection under CEQA, and other state, federal, and local laws, regulations, and ordinances. These communities may, however, provide suitable habitat for some special -status plant or wildlife species and are identified or described in Section 4.4.1 below. 3. 1.2 Sensitive Biological Communities Sensitive biological communities are defined as those communities that are given special protection under CEQA and other applicable federal, state, and local laws, regulations and ordinances. Applicable laws and ordinances are discussed above in Section 2.0. Special methods used to identify sensitive biological communities are discussed below. Sensitive biological communities are identified and described in Section 4.4.1 below. Wetlands and Non -Wetland Waters The Study Area was surveyed to determine if any wetlands and waters potentially subject to jurisdiction by the Corps, RWQCB, or CDFW were present. A routine delineation of Waters of the U.S. subject to EPA/Corps jurisdiction under Section 404 of the CWA, RWQCB Jurisdiction under Section 401 of the CWA and the Porter -Cologne Water Quality Control Act, and CDFW under Section 1602 of the CFGC, was conducted by WRA (2017) and is provided under separate cover. Other Sensitive Biological Communities The Study Area was evaluated for the presence of other sensitive biological communities, including riparian areas or other sensitive plant communities recognized by CDFW. Prior to the site visit, aerial photographs, local soil maps, and A Manual of California Vegetation, Online Edition (CNPS 2017a) were reviewed to assess the potential for sensitive biological communities to occur in the Study Area. All alliances within the Study Area with a ranking of 1 through 3 were considered sensitive biological communities and mapped. These communities are described in Section 4.1.2 below. 3.2 Special -Status Species 3.2.1 Literature Review The potential for special -status species to occur in the Study Area was evaluated by first identifying which special -status species have been documented in the vicinity of the Study Area through a literature and database search. Database searches for known occurrences of listed species focused on the Cotati 7.5 -minute USGS quadrangle, and eight surrounding quadrangles including: Sebastopol, Santa Rosa, Kenwood, Glen Ellen, Petaluma River, Petaluma, Point Reyes NE, and Two Rock. In addition to the literature cited in Section 3.1, WRA also reviewed the following sources to identify which listed plant and wildlife species have been documented to occur in the greater vicinity of the Study Area: • California Natural Diversity Database records (CNDDB) (CDFW 2017) • USFWS Information for Conservation and Planning Database (USFWS 2017b) • CNPS Electronic Inventory records (CNPS 2017b) • Consortium of California Herbaria (CCH 2017) • A Flora of Sonoma County (Best et al. 1996) 0 • CDFG publication "California's Wildlife, volumes I -III" (Zeiner et al. 1990) • CDFG publication "Amphibians and Reptile Species of Special Concern in California" (Thompson et al. 2016) • California Bird Species of Special Concern (Shuford et. al. 2008) • A Field Guide to Western Reptiles and Amphibians (Stebbins 2003) • The Sonoma County Breeding Bird Atlas (Burridge 1995) • Western Bat Working Group Species Accounts (WBWG 2017) 3.2.2 Site Assessment A site visit was conducted of the Study Area to search for suitable habitats for listed species. Habitat conditions observed at the Study Area were used to evaluate the potential for presence of listed species based on these searches and the professional expertise of the investigating biologists. The potential for each listed species to occur in the Study Area was then evaluated according to the following criteria: • No Potential: Habitat on and adjacent to the site is clearly unsuitable for the species requirements (foraging, breeding, cover, substrate, elevation, hydrology, plant community, site history, disturbance regime). • Unlikely: Few of the habitat components meeting the species requirements are present, and/or the majority of habitat on and adjacent to the site is unsuitable or of very poor quality. The species is not likely to be found on the site. • Moderate Potential: Some of the habitat components meeting the species requirements are present, and/or only some of the habitat on or adjacent to the site is unsuitable. The species has a moderate probability of being found on the site. • High Potential: All of the habitat components meeting the species requirements are present and/or most %J the habitat on or adjacent to the site is highly suitable. The species has a high probability of being found on the site. • Present: Species is observed on the site or has been recorded (i.e., CNDDB, other reports) on the site recently. The site assessment is intended to identify the presence or absence of suitable habitat for each special -status species known to occur in the vicinity to determine its potential to occur in the Study Area. The site visit does not constitute a protocol -level survey and is not intended to determine the actual presence or absence of a species. All species observed in the Study Area were recorded and are listed in Appendix A-1 and A-2. In cases where little information is known about species occurrences and habitat requirements, the species evaluation was based on best professional judgment of WRA biologists with experience working with these species and habitats. Special -status species, if observed during the site visit, were recorded and are discussed below in Section 4.3 and in Appendix B. For some species, a site assessment visit at the level conducted for this report may not be sufficient to determine presence or absence of a species to the specifications of regulatory agencies. In these cases, a species may be assumed to be present or further protocol -level special -status species surveys may be necessary. Special -status species for which further protocol -level surveys may be necessary are described in 5.0. �7 4.0 RESULTS A general description of the Study Area and the results of the site assessment are provided in the following sections. A list of plant and wildlife species observed is included as Appendix A-1 and A-2. The assessment of the potential for special -status plant and wildlife species to occur in the Study Area is provided as Appendix B. Photographs of the Study Area are provided as Appendix C. 4.1 Study Area Description The Study Area consists of two publicly -owned properties along the Petaluma River which flows from northwest to southeast and is located approximately 2.25 miles northwest of downtown Petaluma. The 5.11 -acre western property of the Phase IV Study Area (west Study Area) is directly adjacent to the Denman Reach Phase III Flood Control Project, which initiated construction in 2016. The 2.80 -acre eastern property (east Study Area) is located at the Corona Road Bridge. Collectively, both locations are referred to as the Study Area. The Denman Reach Phase III Project proposed to reduce frequent flooding of the Industrial Avenue Business Park area by creating a floodplain terrace with riparian habitat restoration and public access improvements along the upper Petaluma River, Phase III of the Project extended the flood terrace upstream of earlier phases (Denman Reach Phases I and II), which were located upstream of the Corona Road Bridge, and constructed in 2005. This Phase IV Study Area is generally surrounded by rural residential or light commercial development with interspersed non-native annual grassland and some tilled lands. The main creek corridor of the Study Area remains in a natural state and is dominated by mature native riparian forest. The edges of the riparian habitat are dominated by thickets of Himalayan blackberry (Rubus discolor). Non-native annual grassland habitat and ruderal fields occupy the majority of the remainder of the Study Area. Small pockets of seasonal wetlands and swales were observed in portions of the ruderal areas. Land use to the north and east of the Study Area is composed of light industry and vacant lots. Along the southwest side of the Study Area land use is a mix of light industry, agricultural, and residential development. Land use to the south and west of the Study Area include light industrial and rural residential development. Elevations of the Study Area range from approximately 20 to 40 feet NGVD. 4.2 Biological Communities Table 1 summarizes the area of each biological community type and aquatic features observed in the Study Area. There are a total of three non -sensitive biological communities which include developed, non-native grassland, and stormwater retention basin. There are three sensitive biological communities including perennial stream (Petaluma River), seasonal wetland depression, and riparian red willow thicket. Descriptions for each biological community and aquatic features are contained in the following sections and illustrated in Figures 2a and 2b. 10 �4f 40.� to I Foot �l IF IF 41 Ft - h 1 1 _ 0 1.7 Now L _ .��! O 0 ti ti m IL ti w l W O � c O = C V N N E N v E NECL O OJ 0w = N m ci m 3E E N x 7 ` LMOMEN{. U m N E m N a9i ROMMOO O O C N CO O C OSOMMOOMO U N O N O N O 0 co H j d K (D Z O Z SOON m �m Old®� 1 This Page Intentionally Left Blank 12 Table 2_ nummary of Biological Communities in the Studv Area Community Type Area (acres / [linear feet]) Non -sensitive Biological Communities Developed 0.50 Non-native grassland 5.42 Stormwater retention basin 0.13 Sensitive Biological Communities Perennial stream 0.27 [383] Seasonal wetland depression 0.24 Riparian red willow thicket 1.33 4.2.1 Non -Sensitive Biological Communities Developed The developed areas within the Study Area include the existing Corona Road and Corona Road Bridge, which crosses the Petaluma River in the eastern Study Area. The developed area occurs near the middle of the eastern Study Area and is largely devoid of vegetation. A narrow portion of the adjacent light industrial property to the south, outside of the riparian red willow thicket is aIso included in the developed area. This area contained planted coast redwood (Sequoia sempervirens) trees along the fenceline, which may be protected per the Petaluma Tree Ordinance. Non-native grassland Approximately 5.42 acres ofnon-native grassland was mapped within the Study Area. Non-native gI assland is dominated by one or more non-native grasses with a characteristic presence of non- native forbs. These grasslands are dominated by non-native annual species whose populations can shift annually. Non-native grasslands within the Study Area contain elements of several non- native grassland alliances described by CNPS (2017a), including: Harding grass swards (Phalaris aquatica Herbaceous Semi -Natural Alliance), and Perennial rye grass fields (Festuca perennis [Lolium perenne] Herbaceous Semi-Naturai Alliance). Within the Study Area, non-native grassland is mostly dominated by two non-native grass species including Harding grass and Italian rye grass, with other associated non-native grass species present at lower densities including soft chess (Bromus hordeaceus), ripgut brome (B. diandrus), mouse barley (Hordeum murinum), and Mediterranean barley (M. marinum ssp. gussoneanum). Native grass and forb species were sparsely observed in the non-native grasslands, likely a result of repeated disturbance including mowing or discing. Native grass and forb species observed in this community included beardless wildrye (Elymus triticoides), and alkali mallow (Malvella leprosa). Occasional planted native and non-native trees including valley oak (Quercus lobata), and Lombardy poplar (Populus nigra), and non-native invasive shrubs including Himalayan blackberry (Rubus armeniacus) are also included in this community. Individual native oak trees within this community may be considered "protected trees" per the Petaluma Tree Ordinance. 13 Stormwater retention basin An approximately 0.13 -acre stormwater retention basin is located along the eastern edge of the west Study Area. Based on a review of available aerial imagery, it appears that the stormwater retention basin was created in otherwise dry land when surrounding lands were developed sometime between 1968 and 1993 and is regularly maintained through vegetation clearing (NETR 2017). The basin is an excavated feature with rip -rap reinforced slopes. Vegetation surrounding the stormwater retention basin is dominated by arroyo willow (Salix lasiolepis), Himalayan blackberry, and poison hemlock (Conium maculatum). The basin contained standing water with emergent vegetation, including curly dock (Rumex crispus) and flat nutsedge (Cyperus eragrostis). Stormwater management features that were created in dry land are typically considered to be exempt from regulation under Section 404 of the Clean Water Act based on the definition of "waters of the U.S." in 33 CFR 328.3, which states: "Waste treatment systems, including treatment ponds orlagoons designed to meet the requirements of CWA... are not water of the U.S." (33 CFR 328) Stormwater management features are areas constructed to collect water to comply with stormwater management provisions of the CWA, and are within the scope of this exemption. Based on this exclusion, the stormwater retention basin in the Study Area should be considered exempt from the CWA. 4.2.2 Sensitive Biological Communities Perennial stream There is one perennial stream in the Study Area, the Petaluma River. The river occupies approximately 383 linear feet (0.27 acres), and likely flows twelve months out of the year. The perennial stream is shown as a USGS blue -line stream on the Cotati 7.5 minute quadrangle (USGS 1954). Evidence of substantial high flow events was observed as wrack and bent vegetation at or near the top of bank. The river is confined to an approximately 15 to 20 feet deep and 20 to 30 feet wide channel. The bed of the channel contains areas of rock and cobble mixed with sands and silts. The low -flow channel of the stream becomes quite narrow (approximately 2 feet wide during flow at the time of the site visit), flanked on either side by sediment deposition. The most frequent OHWM indicators used to delineate this feature include bed and bank, scouring, wrack, sediment deposition, distinct change in vegetation, and water stains on the banks. Woody species observed on the banks of Petaluma River include box elder (Acer negundo), Oregon ash (Fraxinus latifolia), California bay (Umbellularia californica), arroyo willow, and red willow. Shrubby and herbaceous vegetation located on the banks and dependent upon the perennial hydrology include Himalayan blackberry, stinging nettle (Urtica dioica), flat nutsedge, smartweed (Persicaria sp.), mugwort (Artemisia douglasiana), and poison hemlock. Areas mapped as perennial stream are jurisdictional under Section 404 of the CWA, Section 401 of the CWA, the Porter -Cologne Water Quality Control Act, and Section 1602 of the CFGC. The Petaluma is also designated critical habitat for California central coast chinook and California central coast steelhead. It is designated essential fish habitat (EFH) for coho (Oncorhynchus kisutch) and chinook (Oncorhynchus mykiss irideus) salmon, and special -status wildlife species may be present. 14 Seasonal wetland depression Approximately 0.24 acre of seasonal wetland depressions were mapped within the Study Area. Within the Study Area seasonal wetland depressions are slightly concave areas typically located in low gradient to nearly flat topography. The vegetation is dominated by hydrophytic grasses and forbs, with native species typically not composing dominant species. The most frequently observed species included Italian rye grass, and curly dock (Rumex crispus). Seasonal wetland depressions in the west Study Area are situated in annually disked clay soils with reduced infiltration of collected waters, while the one seasonal wetland depression in the east Study Area is situated in a regularly maintained roadside shoulder that collected runoff from nearby impervious surfaces to the north and west. The hydrology in these features is episaturated with the source from direct precipitation and under- and over -land sheet flow, forming a perched water table within the upper portion of the soil profile. Saturation is likely present during the majority of the wet season in a normal rainfall year, while inundation is typically short-lived and shallow. Boundaries of seasonal wetland depressions were mapped primarily based on subtle to distinct changes in topography, a slight change in vegetation composition, and the occasional presence of surface hydrologic indicators (e.g. standing water). Areas mapped as seasonal wetland contain a prevalence or dominance of hydrophytic vegetation, hydric soils, and wetland hydrology sufficient to meet the requirements as jurisdictional features under Section 404 of the CWA, Section 401 of the CWA, and the Port -Cologne Water Quality Control Act. Riparian red willow thicket Approximately 1.33 acres of riparian red willow thicket (Salix laevigata) Woodland Alliance was mapped in the Study Area, associated with the Petaluma River. This community was mapped according to membership rules (CNPS 2017a) as having red willow present at greater than 30 percent relative cover with arroyo willow dominant in the sub -canopy. The riparian area is a dense, mixed thicket of red willow, arroyo willow, box elder, and Himalayan blackberry. The lateral extent of jurisdiction from the stream was estimated using outward dripline of vegetation that is clearly dependent on or strongly influenced by water within the Petaluma River (e.g, red willow, box elder). Riparian red willow thicket is considered, CDFW jurisdiction under Section 1602 of the CFGC, and RWQCB Jurisdiction under Section 401 of the CWA, and the Port -Cologne Water Quality Control Act. Individual native trees within this community area also considered "protected trees" per the Petaluma Tree Ordinance as they are situated within a riparian area. 4.3 Special -Status Species 4.3.1 Special -Status Plant Species Based on a review of the resources databases listed in Section 3.2.1, 90 special -status plant species have been documented in the vicinity of the Study Area (Appendix B).' Figure 3 depicts known CNDDB records of special -status plant species within a 5 -mile radius of the Study Area. Six special -status plant species have a moderate potential to occur within the Study Area, and are discussed in detail below. The remaining species documented to occur in the vicinity of the Study Area are unlikely or have no potential to occur due to one or more of the following factors: • The species has a very limited range of endemism and has never been observed in the vicinity of the Study Area; • Plant species commonly associated with the special -status species, and which indicate the presence of suitable, intact habitat, are absent from the Study Area; 15 ILL sPL;, I; LLI 1, alkali milk -vetch 5, golden larkspur 9, Petaluma popcornflower 13, two -fork clover ...<z" r 2, congested -headed hayfield tarplant 6, Jepson's leptosiphon 10, Point Reyes checkerbloom ��• 3, fragrant fritillary 7, marsh microseris 11, saline clover le 4, Franciscan onion S, pappose tarplant 12, Sonoma spineflower or= ,IZ , r 1 Exc. a lark Lone G.nF GcY. ua..' Ro}(nert scac..ctac Perk P Ark is ILI - i CIL LA '1 - ❑. Ur - sTA ILL ILI LL ` �arsn,-Crr Cota�; - rd 6 1\ y IS IF IT I Penngr be ILL ILI ILI ILL IL ILL ILL 14 ILL CIL ' C2� Study Area xr r I CIL rd LI 14 ILL 141:1 -4 4 ILL r4: 3 `S 10 Petaluma #�.9 PC (L(d,Z . 12 Ir i Ij ILL M A F.I tJ J 15 i„ nr ,. R. ILIILL i rVIC IN ; lift 5 ILL d,. -r POP _ ', .r; Call WILL ILA _ Sources: National Geographic, CNDDB December 2017, WRA I Prepared By: smortensen, 1/4/2018 Figure 3. Special -Status Plant Species Documented within 5 -miles of the Study Area Denman Reach 1 2 N o3wra APetaluma, California Miles ENVIRONMENTAL CONSULTANTS This Page Intentionally Left Blank 17 • Specc edaphic characteristics, such as soil derived from serpentine or volcanics are absent from the Study Area; • Specific hydrologic characteristics, such as perennial saline, are absent from the Study Area; • Very unique pH characteristics, such as alkali scalds or sinks are absent from the Study Area. All special -status species with a moderate or high potential are discussed below: Pappose tarplant (Centromadia parryi ssp. parry). CNPS Rank 1B. Moderate Potential. Pappose tarplant is an annual herb in the sunflower family (Asteraceae) that blooms from May to November. It typically occurs in vernally mesic, often alkaline areas in coastal prairie, meadow, seep, coastal salt marsh, and valley and foothill grassland habitat at elevations ranging from 5 to 1380 feet (CDFW 2017, CNPS 2017b). This species a facultative wetland (FACW) plant (Lichvar 2016), and is a vernal pool generalist (GEN) (Keeler -Wolf et al. 1998). Observed associated species include bristly ox -tongue (Helminthotheca echioides), wild radish (Raphanus sativus), foxtail fescue (Festuca myuros), willow leaf dock (Rumex salicifolius), toad rush (Juncus bufonius), Italian rye grass (Festuca perennis), Mediterranean barley, salt grass (Distichlis spicata), alkali heath (Frankenia salina), perennial pepperweed (Lepidium latifolium), yellow star thistle (Centaurea solstitialis), alkali mallow (Malvella leprosa), and alkali weed (Cressa truxillensis) (CDFW 2017). Pappose tarplant is known from 17 USGS 7.5 -minute quadrangles in Butte, Colusa, Glenn, Lake, Napa, San Mateo, Solano, and Sonoma counties (CNPS 2017). Pappose tarplant has a moderate potential to occur in the Study Area due to the presence of wetland habitat, and the presence of associated species. Congested -headed hayfield tarplant (Hemizonia congesta ssp. congesta). CNPS Rank 1 B.2. Moderate Potential. Hayfield tarplant is an annual herb in the sunflower family (Asteraceae). It is typically found in coastal scrub and in valley and foothill grassland, often if fallowed fields, and it has sometimes been found along roadsides. It occurs at elevations from 65 to 1,837 feet, and it blooms from April to November (CNPS 2017b). Observed associated species include English plantain (Plantago lanceolate), hairy cats ear (Hypochaeris radicata), broadleaf birdsfoot trefoil (Lotus corniculatus), big quaking grass (Briza maxima), and ripgut brome (CDFW 2017). This species is known from 25 USGS 7.5 -minute quadrangles in Mendocino, Marin, San Francisco, San Mateo and Sonoma counties (CNPS 2017b). Congested -headed hayfield tarplant has a moderate potential to occur in the Study Area due to the presence of wetland habitat, and the presence of associated species. Harlequin lotus (Hosackia gracilis). CNPS Rank 4. Moderate Potential. Harlequin lotus is a perennial forb in the pea family (Fabaceae) that blooms from March to July. It typically occurs in wetlands or ditches in broadleaf upland forest, coastal scrub, closed -cone coniferous forest, cismontane woodland, coastal prairie, meadow and seep, marsh and swamp, North Coast coniferous forest, and valley and foothill grassland habitat at elevations ranging from 0 to 2,275 feet (CNPS 2017b). This species has a wetland indicator status of facultative wetland (FACW) on the National Wetland Plant List (Lichvar 2016). Observed associated species include tinker's penny (Hypericum anagalloides), blue-eyed grass (Sisyrinchium bellum), golden -eyed grass (S. califdmicum), bird's -foot trefoil (Lotus corniculatus), common velvet grass (Holcus lanatus), California oat grass (Danthonia camurnica), and silver hair grass (mita caryophyhea) (personal observation 2017). Harlequin lotus is known from nine USGS 7.5 -minute quadrangles in Del Norte, Humboldt, matin, Mendocino, Monterey, San Benito, Santa Cruz, San Francisco, San Luis Obispo, San Mateo, and Sonoma counties (CNPS 2017b). Harlequin lotus has a moderate potential to occur in the seasonal wetland portions of the Study Area due to the presence of associated species, and vernally mesic hydrology. Marsh microseris (Microseris paludosa). CNPS Rank 1 B. Moderate Potential. Marsh Microseris is a perennial forb in the sunflower family (Asteraceae) that blooms from April through July. It typically occurs in closed -cone coniferous forest, cismontane woodland, coastal scrub, and valley and foothill grassland habitat at elevations ranging from 15 to 985 feet (CDFW 2017, CNPS 2017b). Observed associated species include coast live oak, coyote brush (Baccharis )ilularis), English plantain, blue-eyed grass, bracken fern (Pteridium aquilinum), rough cat's ear (Hypochaeris radicata), common velvet grass, little rattlesnake grass (Briza minima), narrow -leaf mule ears (Wyethia angustifolia), and Douglas iris (Iris douglasiana) (CDFW 2017). Marsh microseris is known from 24 USGS 7.5 -minute quadrangles in Marin, Mendocino, Monterey, San Benito, Santa Cruz, San Francisco, San Luis Obispo, San Mateo, and Sonoma counties (CNPS 2017b). Marsh microseris has a moderate potential to occur in mesic areas within grassland in the Study Area due to the presence of suitable habitat. Cotula navarettia (Navarretia cotulifolia) CNPS Rank 4. Baker's navarretia is an annual herb in the phlox family (Polemoniaceae) that blooms from May to June. It typically occurs in vernally wet areas underlain by adobe substrates in chaparral, cismontane woodland, and valley and foothill grassland at elevations ranging from 10 to 6,005 feet (CDFW 2017, CNPS 2017b). Observed associated species are not reported in the literature. Cotula navarretia is known from 6 UGSG 7.5 -minute quadrangles in Alameda, Butte, Contra Costa, COIUSa, Glenn, Lake, Mendocino, Marin, Napa, San Benito, Santa Clara, Siskiyou, Solano, Sonoma, Sutter, and Yolo counties (CNPS 2017b). Cotula navarretia has a moderate potential to occur in the Study Area due to the presence of grassland habitat underlain by clay soils. Gairdner's yampah (Perideridia gairdneri ssp. gairdner��. CNPS Rank 4. Moderate Potential. Gairdner's yampah is a perennial forb in the carrot family (Apiaceae) that blooms from June to October. It typically occurs in vernally mesic areas within broadleaf upland forest, chaparral, coastal prairie, valley and foothill grassland, and vernal pool habitat at elevations ranging from 0 to 1985 feet (CNPS 2015, Baldwin et al. 2012). This species is a facultative (FAC) plant (Lichvar 2016), and is known from vernal pool habitat in some regions of California, but is generalist in others (VPA?) (Keeler -Wolf et al. 1998). Observed associated species include meadow barley, purple needlegrass, dallisgrass (Paspalum dilatatum), Kellogg's yampah (Perideridia kelloggii), Harlequin lotus, johnny-nip (Castilleja ambigua ssp, ambigua), and large flowered star tulip (Personal observation 2016 at Lagunitas Meadows, Marin County; Howell et a1. 2007). Gairdner's yampah is known from 15 USGS 7.5 -minute quadrangles in Contra Costa, Kern, Los Angeles, Marin, Mendocino, Monterey, Napa, Orange, San Benito, Santa Clara, Santa Cruz, San Diego, San Luis Obispo, San Mateo, Solano, and Sonoma counties (CNPS 2017b). Gairdner's yampah has a moderate potential to occur in mesic areas within grassland in the Study Area due to the presence of suitable habitat. fiE!7 4.3.2 Special -Status Wildlife 84 special -status species of have been recorded in the vicinity of the Study Area based on a review of CNDDB (CDFW 2017) and USFWS (USFWS 2017) records and other resources. Appendix B summarizes the potential for each of these species to occur in the Study Area. Figure 4 depicts known CNDDB records of special -status plant species within a 5 -mile radius of the Study Area. No special -status wildlife species were observed in the Study Area during the site assessment. 19 special -status wildlife species with a moderate or high potential to occur in the Study Area are discussed below. Although monarch butterfly is likely to transit through the Study Area, it is unlikely to roost there. Regulatory protections for this species are applied to roosts, not individuals, so no further surveys or mitigation measures are recommended and this species is not discussed further. Measures to reduce avoid or reduce impacts to the following species are described in Section 5.3 of this assessment. Fringed myotis (Myons thysanodes). WBWG. High Priority. Moderate Potential. The fringed myotis ranges through much of western North America from southern British Columbia, Canada, south to Chiapas, Mexico and from Santa Cruz Island in California, east to the Black Hills of South Dakota. This species is found in desert scrubland, grassland, sage -grass steppe, old-growth forest, and subalpine coniferous and mixed deciduous forest. Oak and pinyon -juniper woodlands are most commonly used. The fringed myotis roosts in colonies from 10 to 2,000 individuals, although large colonies are rare. Caves, buildings, underground mines, rock crevices in cliff faces, and bridges are used for maternity and night roosts, while hibernation has only been documented in buildings and underground mines. Tree -roosting has also been documented in Oregon, New Mexico, and California (WBWG 2017). Some of the trees in the Study Area may provide suitable day/night roosts. The bridge within the Study Area does not provide cracks with thermal stability suitable for roosting bats. Due to the presence of roosting opportunities as well as the proximity to water and foraging opportunities, this species has a moderate potential to roost within the Study Area. Hoary bat (Lasiurus cinereus). WBWG Medium Priority. Moderate Potential. Hoary bats are highly associated with forested habitats in the western United States, particularly in the Pacific Northwest. They are a solitary species and roost primarily in foliage of both coniferous and deciduous trees, near the ends of branches, usually at the edge of a clearing. Roosts are typically 10 to 30 feet above the ground. They have also been documented roosting in caves, beneath rock ledges, in woodpecker holes, in grey squirrel nests, under driftwood, and clinging to the side of buildings, though this behavior is not typical. Hoary bats are thought to be highly migratory, however, wintering sites and migratory routes have not been well documented. This species tolerates a wide range of temperatures and has been captured at air temperatures between 0 and 22 degrees Celsius. Hoary bats probably mate in the fall, with delayed implantation leading to birth in May through July. They usually emerge late in the evening to forage, typically from just over one hour after sunset to after midnight. This species reportedly has a strong preference for moths, but is also known to eat beetles, flies, grasshoppers, termites, dragonflies, and wasps (WBWG 2017). The bridge within the Study Area does not provide cracks with thermal stability suitable for roosting bats. However, some of the trees within the Study Area may be suitable for Jay roosting bats. Due to the presence of roosting opportunities as well as the proximity to water and foraging opportunities, this species has a moderate potential to roost within the Study Area. 20 A AA VAN, A AAA A ALI AAA y 1 1, American badger 7, foothill yellow -legged frog 13, salt -marsh harvest mouse 19, western bumble bee a 2, burrowing owl 8, golden eagle 14, saltmarsh common yellowthroat 20, western pond turtle 3, California black rail 9, mimic tryonia (=California brackishwater snail) 15, San Pablo song sparrow 21, western yellow -billed cuckoo 4, California red -legged frog 10, pallid hat 16, steelhead - central California wast DPS 5, California Ridgway s Rall 11, red -bellied newt 17, Swainson's hawk 6. California tiger salamander 12, Sacramento splittall 18, Townsend's big -eared bat 1npY Lone ,late R,se A dl n a 'L t A .1. 14l1 ��7f 2P�. r,' I II if �*Jr e fir � I � 4i a pen20ove I.Aj J AAA i-Pl.per Ln A-( A . J 'VP 3 11 20 A. 18 1 4 .11�. nail.,. 11 - - A A ' v ' mfStu-dy Area AA Af - 2o _ l -4, 21 ��A All 2 \:, f rT lie 11j� _ �l `S% Petaluma 14 .'1� qA 3 �(/ _ 4jr A Q., 5%�134 F 4 41 L„ �_ r ZQr r Z, 2Q j`13 � �� f. ), e ` del 1_�A_ 4. I 1 ® -� FF \ 13,•� ' Sensitive Occurences:Al 17P —�� California red -legged frog #: 742 jAli, A western pond turtle #:599 �\ l �j d, r / - Sources: National Geographic, CNDDB December 2017, WRA Prepared By: smortensen, 1/11/2018 Figure 4. Special -Status Wildlife Species Documented within 5 -miles of the Study Area Denman Reach 0 1 z N sswra Petaluma, California Miles A ENVIRONMENTAL CONSULTANTS This Page Intentionally Left Blank 22 Long-legged myotis (Myons volans). WBWG High Priority. Moderate Potential. The long- legged myotis ranges across western North America from southeastern Alaska to Baja California and east to the Great Plains and central Texas. This species is usually found in coniferous forests, but also occurs seasonally in riparian and desert habitats. They use abandoned buildings, cracks in the ground, cliff crevices, exfoliating tree bark and hollows within snags as summer day roosts. Caves and mines are used as hibernation roosts. Long-legged myotis forage in and around the forest canopy and feed on moths and other soft -bodies insects (WBWG 2017). The bridge within the Study Area does not provide cracks with thermal stability suitable for roosting bats. However, some of the trees within the Study Area may be suitable for day roosting bats. Due to the presence of roosting opportunities as well as the proximity to water and foraging opportunities, this species has a moderate potential to roost within the Study Area. Pallid bat (Antrozous pallidus). CDFW Species of Special Concern. WBWG High Priority. Moderate Potential. Pallid bats occur in a number of habitats ranging from rocky arid deserts to grasslands and higher elevation coniferous forests. They are most abundant in the arid Sonoran life zones below 6,000 feet. Pallid bats often roost in colonies of between 20 and several hundred individuals. Roosts are typically in rock crevices, tree hollows, mines, caves, and a variety of man-made structures, including vacant and occupied buildings. Tree roosting has been documented in large conifer snags (e.g, ponderosa pine), inside basal hollows of redwoods and giant sequoias, and within bole cavities in oak trees. They have also been reported roosting in stacks of burlap sacks and stone piles. Pallid bats are primarily insectivorous, feeding on large prey that is taken on the ground, or sometimes in flight. Prey items include arthropods such as scorpions, ground crickets, and cicadas (WBWG 2017). The bridge within the Study Area does not provide cracks with thermal stability suitable for roosting bats. However, some of the trees within the Study Area may be suitable for day roosting bats. Due to the presence of roosting opportunities as well as the proximity to water and foraging opportunities, this species has a moderate potential to roost within the Study Area. Townsend's big -eared bat, (Corynorhinus townsendii), CDFW Species of Special Concern, WBWG High Priority. Moderate Potential. This species ranges throughout western North America from British Columbia to central Mexico. Its local distribution is strongly associated with the presence of caves, but roosting also occurs within man-made structures including mines and buildings. While many bats species wedge themselves into tight cracks and crevices, big -eared bats hang from walls and ceilings in the open. Males roost singly during the spring and summer months while females aggregate in the spring at maternity roosts to give birth. Females roost with their young until late summer or early fall, until the young become independent, flying and foraging on their own. In central and southern California, hibernation roosts tend to be made up A small aggregations of individuals (Pierson and Rainey 1998). Foraging typically occurs along edge habitats near streams and wooded areas, where moths are the primary prey (WBWG 2015). The Study Area contains several large oak trees which may provide roosting opportunities. Therefore, Townsend's big -eared bat has a moderate potential to occur within the Study Area. Western red bat (Lasiurus blossevillfi ). CDFW Species of Special Concern. WBWG High Priority. Moderate Potential. This species is highly migratory and broadly distributed, reaching from southern Canada through much of the western United States. They are typically solitary, roosting primarily in the foliage of trees or shrubs. Day roosts are commonly in edge habitats adjacent to streams or open fields, in orchards, sometimes in urban areas and possibly in association with riparian habitat (particularly willows, cottonwoods, and sycamores). Some of the trees within the Study Area may be suitable for day roosting bats. Due to the presence of roosting 23 opportunities as well as the proximity to water and foraging opportunities, this species has a moderate potential to roost within the Study Area. White-tailed kite (Elanus IeuCuruS), CDFW FUlly Protected Species. Moderate Potential. Kites occur in low elevation grassland, agricultural, wetland, oak woodland, and savannah habitats. Riparian zones adjacent to open areas are also used. Vegetative structure and prey availability seem to be more important than specific associations with plant species or vegetative communities. Lightly grazed or ungrazed fields generally support large prey populations and are often preferred to other habitats. Kites primarily feed on small mammals, although, birds, reptiles, amphibians, and insects are also taken. Nest trees range from single isolated trees to trees within large contiguous forests. Preferred nest trees are extremely variable, ranging from small shrubs (less than 10 feet tall), to large trees (greater than 150 feet tall) (Dunk 1995). There is a moderate potential for White-tailed kite to occur in the Study Area due to the presence of suitable nesting sites and adjacent grassland and agricultural fields provide open foraging habitat. Wrentit (Chamaea fasciata). USFWS Bird of Conservation Concern. High Potential. Resident of coastal scrub and chaparral along the west coast. Away from the coast they occupy a variety of habitats including suburban yards and parks. This species occupies a small home range and does not migrate. Nuttall's woodpecker (Picoides nuttalli��. USFWS Bird of Conservation Concern. Moderate Potential. This species is found primarily in oak woodlands and in riparian woods and orchards, and rarely in conifers. It nests in tree cavities and feeds on insects and arthropods (Lowther 2000). It has been observed in the vicinity of the Study Area (Burridge 1995). Allen's hummingbird (Se/asphorus Basin). USFWS Bird of Conservation Concern. Moderate Potential. Allen's hummingbird, common in many portions of its range, is a summer resident along the majority of California's coast and a year-round resident in portions of coastal southern California and the Channel .Islands. Breeding occurs in association with the coastal fog belt, and typical habitats used include coastal scrub, riparian, woodland and forest edges, and eucalyptus or cypress groves (Mitchell 2000). It feeds on nectar, as well as insects and spiders. This generalist species has a moderate potential to nest within the Study Area. Rufous hummingbird (Se/asphorus rufus). USFWS Bird of Conservation Concern. Moderate Potential. The Rufous Hummingbird is a common migrant and uncommon summer resident in California. It occurs in a wide variety of habitats as long as they provide abundant nectar sources. The presence of suitable nest trees and nectaring plants within the Study Area gives this species a moderate potential to occur. Oak titmouse (Baeolophus inornatus). USFWS Bird of Conservation Concern. Moderate Potential. This relatively common species is year-round resident throughout much of California including most of the coastal slope, the Central Valley and the western Sierra Nevada foothills. Its primary habitat is woodland dominated by oaks. Local populations have adapted to woodlands of pines and/or junipers in some areas (Cicero 2000). The oak titmouse nests in tree cavities, usually natural cavities or those excavated by woodpeckers, though they may partially excavate their own (Cicero 2000). Seeds and arboreal invertebrates make up the birds' diet. Trees within the Study Area may provide suitable habitat to support nesting and foraging by the species; therefore, oak titmouse has a moderate potential to nest within the Study Area. Yellow warbler (Dendroica petechia brewsteri). CDFW Species of Special Concern. Moderate Potential. Yellow Warbler occurs most commonly in wet, deciduous thickets along stream courses, especially those dominated by willows. This species is found at lower elevations in California and at higher elevations along watercourses with riparian growth (Lowther et al. 1999). Yellow warbler populations have declined due to brood parasitism by brown -headed cowbirds (Molothrus ater) and habitat destruction. This species' diet is primarily comprised of insects, supplemented with berries. The Study Area provides dense blackberry bushes in clearings along the riparian corridor, and this habitat is considered typical nesting and foraging habitat for this species. However, human disturbance and urban development in the area reduce the value of habitat onsite; therefore, this species has a moderate potential to occur in the Study Area Loggerhead Shrike (Lanius ludovicianus), CDFW Species of Special Concern, USFWS Bird A Conservation Concern. Moderate Potential. The loggerhead shrike is a common resident and winter visitor in lowlands and foothills throughout California. It prefers open habitats with scattered trees, shrubs, posts, fences, utility lines or other perches. Nests are usually built on a stable branch in a densely -foliaged shrub or small tree and are usually well -concealed. The highest densities occur in open -canopied valley foothill hardwood, valley foothill hardwood - conifer, valley foothill riparian pinyon -juniper, juniper, and desert riparian habitats. While this species eats mostly Arthropods, they also take amphibians, small to medium-sized reptiles, small mammals and birds, and is also known to scavenge on carrion. The Study Area provides pockets of dense riparian nesting habitat for this species, and open foraging areas are available adjacent to the site. Open fields are not extensive due to urban development; therefore, this species has a moderate potential to occur in the Study Area. Yellow -breasted Chat (/cteria wens), CDFW Species of Special Concern. Yellow -breasted Chat is an uncommon summer resident and migrant in coastal California and in foothills of the Sierra Nevada. It is a large warbler found in dense, brushy thickets and tangles near water, and in thick understory in riparian woodland. The Study Area provides pockets of dense riparian habitat for nesting and foraging. The species is a probable breeder in vicinity of the Study Area (Burridge 1995). Though human disturbance and urban development in the area reduce the value this habitat, this species has a moderate potential to occur in the Study Area. Pacific (western) pond turtle (Actinemys marmorata). CDFW Species of Special Concern, Moderate Potential. The only native freshwater turtle in California, Pacific pond turtle (PPT) is found in suitable aquatic habitat throughout California west of the Sierras. It inhabits perennial aquatic habitats, such as lakes, ponds, rivers, streams, and canals that provide submerged cover and suitable basking structures, such as rocks and logs. Pacific pond turtles prefer to nest on unshaded slopes close to their aquatic habitat, and hatchlings require shallow water with relatively dense vegetation for foraging for aquatic invertebrates (Jennings and Hayes 1994). Turtles require suitable aquatic habitat for most of the year; however, to escape periods of high water flow, high salinity, or prolonged dry conditions, PPT may move upstream and/or take refuge in vegetated, upland habitat for up to four months (Rathbun et al. 2002). Although upland habitat is utilized for refuge and nesting, this species preferentially utilizes aquatic and riparian corridors for movement and dispersal. This species has been documented to occur in the Petaluma River system less than one mile upstream of the Study Area (CDFG 2017). The aquatic habitat in the Study Area is perennial and supports patches of vegetation suitable for foraging. Algae on the water surface may provide suitable cover, though few basking structures were observed. This species has moderate potential to occur in the Study Area. 25 Chinook Salmon - Central Valley Fall/late fall -run ESU (Oncorhynchus tshawytscha), NMFS Species.of Concern, CDFG Species of Special Concern. Moderate Potential. The Central Valley Fall/late fall -run Evolutionarily Significant Unit (ESU) includes all naturally spawned fall -run populations from the Sacramento - San Joaquin River mainstem and its tributaries. Late -fall run chinook salmon are morphologically similar to spring -run chinook. They are large salmonids, reaching 75-100 cm SL and weighing up to 9-10 kg or more. The great majority of late -fall chinook salmon appear to spawn in the mainstem of the Sacramento River, which they enter from October through February. Spawning occurs in January, February and March, although it may extend into April in some years. Fry have emerged by early June, and the juveniles hold in the river for nearly a year before moving out to sea the following December through March. The specific habitat requirements of late -fall chinook have not been determined, but they are presumably similar to other chinook salmon runs and fall within the range of physical and chemical characteristics of the Sacramento River above Red Bluff. When anticipated winter rains increase the streamflow of Denman Reach, this species may migrate through the Study Area in search of appropriate spawning habitat. In the Study Area, no gravelly substrate characteristic of Chinook spawning habitat is available; however, the aquatic habitat onsite may provide rearing and foraging habitat for juveniles. There is a moderate potential for this species to occur in the Study Area. Steelhead - Central California Coast ESU (Oncorhynchus mykiss irideus), Federal Threatened Species. Moderate Potential. The Central California Coast ESU includes all naturally spawned populations of steelhead (and their progeny) in California streams from the Russian River to Aptos Creek, and the drainages of San Francisco and San Pablo Bays eastward to the Napa River (inclusive), excluding the Sacramento -San Joaquin River Basin. Steelhead typically migrate to marine waters after spending two years in freshwater, though they may stay up to seven. They then reside in marine waters for 2 or 3 years prior to returning to their natal stream to spawn as 4 -or 5 -year-olds. Steelhead adults typically spawn between December and June. In California, females typically spawn two times before they die. Preferred spawning habitat for steelhead is in perennial streams with cool to cold water temperatures, high dissolved oxygen levels and fast flowing water. Abundant riffle areas (shallow areas with gravel or cobble substrate) for spawning and deeper pools with sufficient riparian cover for rearing are necessary for successful breeding. Central California Coast Steelhead migrate up the Petaluma River in the fall and winter to spawn in the winter and spring. Though the Study Area does not provide suitable gravel substrate for spawning, adults of this ESU migrate through in search of spawning habitat, and juveniles may rear onsite. The Petaluma River, including the stretch of river within the Study Area, is considered Critical Habitat for this ESU by NMFS (2017), and CNDDB records indicate that this ESU has been observed in the Petaluma River system within five miles of the Study Area (CDFG 2017). Therefore, there is a moderate potential for this ESU to occur in the Study Area, Sacramento Splittail (Pogonichthys macrolepidotus), CDFW Species of Special Concern, Moderate Potential. Splittail are primarily freshwater fish that have been found mostly in slow- moving sections of rivers and sloughs, and in the Delta and Suisun Marsh they seemed to congregate in dead-end sloughs (Moyle et al. 1982, Daniels and Moyle 1983). Splittail are benthic foragers that feed extensively on opossum shrimp (Neomysis mercedis). However, detrital material typically makes up a high percentage of their stomach contents. They will feed opportunistically on earthworms, clams, insect larvae, and other invertebrates. They are preyed upon by striped bass and other predatory fishes. Splittail apparently require flooded vegetation for spawning and as foraging areas for young, hence are found in habitat subject to periodic flooding during the breeding season (Caywood 1974). Recent occurrences of this species are known from the Petaluma River, about 1 mile downstream from the Study Area (CDFW 2017). 09 Though recent flooding in 2016-2017 has impacted the quality of the habitat in the Study Area, this species may occur in the Study Area. 4.3.3 Listed Wildlife Species Unlikely to Occur U Study Area Federally listed species that are documented to occur in the same region of the Study Area, but are unlikely or have no potential to occur in the Study Area include: California red -legged frog, western yellow -billed cuckoo, California tiger salamander, green sturgeon, delta smelt, coho salmon - central California coast ESU, California freshwater shrimp, callippe silverspot butterfly, Behren's silverspot butterfly, and Myrtle's silverspot butterfly. There are no state -listed species with potential to occur in the Study Area. The federal -listed species documented to occur in this region are discussed below. California red -Legged frog (Rana draytoni►�. Federal Threatened, CDFW Species of Special Concern, Unlikely. California red -legged frog (CRLF) is dependent on suitable aquatic and upland habitat. Aquatic habitat is characterized by dense, riparian vegetation and deep, still or slow-moving water. Water must be present in breeding habitat for a minimum of 20 weeks to allow for eggs to hatch, larvae to develop and transition into terrestrial frogs. Breeding occurs between late November and late April. California red -legged frog may aestivate during the dry months in small mammal burrows, moist leaf litter, stream channels, and large cracks in the bottom of dried ponds. California red -legged frogs use upland habitat to disperse and forage. Despite documented occurrences of CRLF within two miles of the Study Area (CDFW 2017), the species is unlikely to occupy the habitats within the Study Area. The Petaluma River runs through and adjacent to the Study Area and contains potential aquatic non -breeding and dispersal habitat for this species, however barriers to dispersal and colonization, introduced predators and recent floods make the habitat within the Study Area inhospitable to CRLF. Dominant substrates consist of fine grains, fill in most of the complex aquatic features that would characterize more suitable CRLF aquatic habitat. Dominance of these fine grains, which mobilize easily during flood events, reduces the capacity for emergent vegetation (important for cover and for oviposition sites) to establish and persist. The river is managed as a flood control channel to optimize efficiency of water conveyance, which reduces its capacity to naturally maintain deep pools and backwaters by creating a flow regime that is punctuated by peak flows that attenuate rapidly. These high peak flows would subject CRLF eggs and larvae to water velocities that they are not adapted to endure. Red swamp crayfish (Procambarus clarkii) were observed during the site visit and centrarchid fish (sunfish) are documented to occur in the Petaluma River (CalFish 2017). These introduced predators are known to strongly reduce CRLF presence as their larvae are ill adapted to avoid them. The river is confined to a narrow corridor and lacks the natural sinuosity and complexity of habitats (protected backwaters, deep pools, emergent vegetation) typical of natural streams of its size and gradient. Water turbidity is high and most pools are long and stagnant. As a combined result of these factors, suitable breeding habitat for CRLF in and adjacent to the Study Area is absent. The upland areas surrounding the narrow riparian corridor are disturbed (disced or mowed fields, recreational trail) and urbanized (busy roads, residential and commercial use). The degree of disturbance and urbanization in these surrounding areas is a hindrance to movement of CRLF from the nearest suitable breeding habitat, which is more than a mile away. As a result of these barriers to dispersal and colonization and the aforementioned combination of factors that compromise the aquatic habitat in the Study Area, CRLF is unlikely to occur. However, due to the presence of nearby occurrences and CRLFs capability to disperse for up to 2 miles from suitable breeding habitat, further recommendations for this species are included in Section 5.3 of this assessment. This assessment is in agreement with the 2016 not likely to adversely affect 27 (NCAA) determination issued by the Army Corps of Engineers (Corps 20 16) for areas immediately upstream of this project phase. Western Yellow -billed Cuckoo (Coccyzus americanus occidentalis), Federal Threatened, State Endangered Species, USFWS Bird of Conservation Concern. The western yellow -billed cuckoo is a summer visitor, occurring in California from about mid-May until early September. This species prefers mixed old growth riparian forests of willow and cottonwood, with an understory dense with blackberries and California wild grape. These cuckoos require an average of 17 hectares of dense riparian habitat per pair for foraging and nesting. The riparian habitat onsite may not be extensive enough for this species to forage and nest. It is surrounded by urban development and is subject to high levels of human disturbance. This species is also considered extirpated from Sonoma County (CDFG 2008); therefore, it is unlikely that this species would occur in the Study Area, California Tiger Salamander (Ambystoma californiense), Federal Threatened, State Threatened. The California tiger salamander is restricted to grasslands and low -elevation foothill regions in California (generally under 1500 feet) where it uses seasonal aquatic habitats for breeding. The salamanders breed in natural ephemeral pools, or ponds that mimic ephemeral pools (stock ponds that go dry), and occupy substantial areas surrounding the breeding pool as adults. California tiger salamanders spend most of their time in the grasslands surrounding breeding pools. They survive hot, dry summers by estivating (going through a dormant period) in refugia (such as burrows created by ground squirrels and other mammals and deep cracks or holes in the ground) where the soil atmosphere remains near the water saturation point. During wet periods, the salamanders may emerge from refugia and feed in the surrounding grasslands. The aquatic habitat in the Study Area is perennial, lotic and subject to seasonal high flow events and therefore unsuitable for this species. In addition, the area is surrounded by urban development and does not appear to provide sufficient refugia for this species. Several of the adjacent upland fields in which this species might find refuge were tilled and most were disced. The habitat onsite is not considered suitable for this species; therefore, it is unlikely that this species would occur in the Study Area, Green Sturgeon (Acipenser medirostris), Federal Threatened, CDFG Species of Special Concern. Green sturgeon are generally found in marine waters from the Bering Sea to Ensenada, Mexico. However, spawning populations have been found only in medium-sized rivers from the Sacramento -San Joaquin system north. Spawning occurs in the Sacramento River between March and June; it may extend slightly longer, into July, in the Klamath River. Water temperature during spawning is likely 50° to 70°F. Little is known about spawning behavior. Spawning occurs in deep, fast water. The fertilized eggs are slightly adhesive and hatch after four to 12 days. Larvae stay close to the bottom and appear to rear primarily in rivers well upstream of estuaries. This species is not known to spawn in the Petaluma River system, and the Study Area is outside the established range for this species (CalFish 2017); therefore, it is unlikely that this species would occur in the Study Area. Delta Smelt (Hypomesus transpacificus), Federal Threatened, State Threatened Species. Delta Smelt are a pelagic (live in the open water column away from the bottom) and euryhaline species (tolerant of a wide salinity range) found in brackish water. They are found only in the Sacramento -San Joaquin Estuary and as far upstream as the mouth of the American River on the Sacramento River and Mossdale on the San Joaquin River. They extend downstream as far as San Pablo Bay. During the late winter to early summer, delta smelt migrate to freshwater to spawn. Larvae hatch between 1 0-1 4 days, are planktonic (float with the water currents), and are washed downstream until they reach areas near the entrapment zone where salt and fresh water mix. The Study Area is outside the known range for this species (CDFW 2017) and typically spawns and forages in the Sacramento -San Joaquin delta system; therefore, it is unlikely that this species would occur in the Study Area, Coho Salmon - Central California Coast ESU (Oncorhynchus kisutch), Federal Endangered, State Endangered Species, The Central California Coast ESU includes all naturally spawned populations of coho salmon (and their progeny) in California streams from the Eel River to Aptos Creek, including the Russian River and its tributaries, excluding the Sacramento -San Joaquin River Basin. Coho salmon typically migrate in late -fall to early winter to spawn in smaller, coastal streams. Spawning migration known as "runs" occur throughout the year. Spawning occurs mainly between November and January, but can occur as late as March during drought conditions. Juveniles may spend several years in the freshwater habitat before migrating to the ocean. Most adult fish return "home" maintaining fidelity to their natal stream. Preferred spawning habitat for coho salmon is small freshwater streams, with cool to cold water temperatures, medium to small gravel substrate, high dissolved oxygen levels, at the head of a riffle where water changes from laminar flow to turbulent flow (provides greater dissolved oxygen). Abundant riffle areas (shallow areas with gravel substrate) for spawning and deeper pools with sufficient riparian cover for rearing are necessary for successful breeding. There are no documented occurrences of this ESU in the Petaluma River, and it is presumed extirpated from the region (CDFW 2017); therefore, it is unlikely that this species would occur in the Study Area. California freshwater shrimp (Syncaris Pacifica), Federal Endangered, State Endangered Species. California freshwater shrimp are detritus feeders found in low -elevation and low - gradient streams where banks are structurally diverse, containing undercut banks, exposed roots, overhanging woody debris, or overhanging vegetation. Historically the shrimp is assumed to have been common in perennial freshwater streams in Marin, Sonoma, and Napa counties. This species is not known to occur in the Petaluma River or its tributaries (CDFW 2017, Serpa 1996) and banks in the Study Area are not structurally diverse due to recent high flows and heavy sediment loads. The presence of centrarchids and red swamp crayfish also reduce the likelihood of the species to occur in the Study Area. Therefore it is unlikely for California freshwater shrimp to occur in the Study Area. callippe silverspot butterfly (Speyeria callippe callippe), Federal Endangered. The callippe silverspot butterfly is a subspecies of the more common callippe fritallary butterfly (Speyeria callippe). The potential for this species to occur is dependent on the presence of the silverspot's hostplant, Johnny jump-up (Viola pedunculata). No suitable coastal habitat occurs within or adjacent to the Study Area. In addition, no larval hostplant species were observed during the site visit; therefore, it is unlikely that this species would occur in the Study Area. Myrtle's silverspot butterfly (Speyeria zerene myrtleae), Federal Endangered. Populations were formerly found in coastal dune or prairie habitat from San Mateo County north to the mouth of the Russian River in Sonoma County. The populations south of the Golden Gate apparently have been extirpated by urban development. Four populations are known to inhabit coastal terrace prairie, coastal bluff scrub, and associated non-native grassland habitats in western Marin 29 and southwestern Sonoma counties, including the Point Reyes National Seashore. Adult butterflies are typically found in areas that are sheltered from the wind, below 810 feet (250 meters) elevation, and within three miles of the coast. The potential for this species to occur is dependent on the presence of the silverspot's larval hostplant, which is typically the hookedspur violet (Viola adunca) (Black and Vaughan 2005). No suitable coastal habitat occurs within or adjacent to the Study Area. In addition, no larval hostplant species were observed during the site visit; therefore, it is unlikely that this species would occur in the Study Area, San Bruno Elfin Buttertly (Callophrys mossii bayensis). Federal Endangered. No Potential to Occur. San Bruno elfin butterfly inhabits coastal mountains near San Francisco Bay. Specifically, it prefers steep north -facing slopes in the fog -belt that receive little direct sunlight. It prefers near -prolific growths of the larval food plant, broadleaf stonecrop (Sedum spathulifolium), a low growing succulent associated with rocky outcrops that occur on steep, north -facing slopes in coastal scrub habitats from 200 to 5,000 feet elevation. The San Bruno elfin is restricted to a few small populations, the largest of which occurs on San Bruno Mountain, The Study Area is dominated by non-native annual grassland and non-native trees and is below 500 feet elevation. The larval host plant for this species was not observed in the Study Area during the site assessment. These topographic features and lack of host plants make the Study Area unsuitable for the species. The Study Area is out of the accepted range of the species. The lack of host plants, current dominant plant communities and elevation of the Study Area combined with lack of observed occurrences suggests that this species has no potential to occur in the Study Area. 5.0 POTENTIAL IMPACTS, AVOIDANCE, MINIMIZATION, AND MITIGATION MEASURES 5.1 Project Description Phase IV of the Denman Reach flood control Project proposes to continue to reduce frequent flooding of in an industrial -zoned area of Petaluma as part of the greater Petaluma River Flood Management and Enhancement Project, The Project purpose is to decrease flooding events by creating additional flood storage. Preliminary Project designs (City of Petaluma 2016) include floodplain terracing and/or detention basins in the west Study Area, and removing accumulated sediment in the Petaluma River, and repairing scouring beneath the east abutment of the Corona River Bridge in the east Study Area. 5.2 Significance Threshold Criteria Pursuant to Appendix G, Section IV of the State CEQA Guidelines, a project would have a significant impact on biological resources if it would: a) Have a substantial adverse effect, either directly or through habitat modifications, on any species identified as a candidate, sensitive, or special -status species in local or regional plans, policies, or regulations, or by the CDFW or USFWS; b) Have a substantial adverse effect on any riparian habitat or other sensitive natural community identified in local or regional plans, policies, regulations, or by the CDFW or USFWS; �?n c) Have a substantial adverse effect on federally protected wetlands as defined by Section 404 of the Clean Water Act (including, but not limited to, marsh, vernal pool, coastal, etc.) through direct removal, filling, hydrological interruption, or other means; d) Interfere substantially with the movement of any native resident or migratory fish or wildlife species or with established native resident or migratory wildlife corridors, or impede the use of native wildlife nursery sites; e) Conflict with any local policies or ordinances protecting biological resources, such as a tree preservation policy or ordinance; and/or, f) Conflict with the provisions of an adopted Habitat Conservation Plan, Natural Community Conservation Plan, or other approved local, regional, or state habitat conservation plan. This report utilizes these thresholds in the analysis of impacts and determination of the significance of those impacts. The assessment of impacts under CEQA is based on the changes caused by the Project relative to the existing conditions in the Study Area. The existing conditions in the Study Area are described above, based on surveys conducted in 2017. In applying CEQA Appendix G, the terms "substantial" and "substantially" are used as the basis for significance determinations in many of the thresholds, but are not defined qualitatively or quantitatively in CEQA or in technical literature. In some cases, such as direct impacts to special -status species listed under the CESA or ESA, the determination of a substantial impact may be relatively straightforward. In other cases, the determination is less clear, and requires application of best professional judgment based on knowledge of site conditions as well as the ecology and physiology of biological resources present in a given area. Determinations of whether or not Project activities will result in a substantial adverse effect to biological resources are discussed in the following sections for sensitive biological communities, special -status plant species, and special -status wildlife species. 5.3 Potentially Significant Impacts Three sensitive biological communities are present within the Study Area including perennial stream, seasonal wetland depression, and riparian red willow thicket. Six special -status plant species and 19 special -status wildlife species have potential to occur within the Study Area. Potential impacts to these sensitive resources associated with the proposed Project are discussed below. Recommended avoidance, minimization, and mitigation measures to reduce such impacts are also included. 5.3.1 Biological Communities Potential Impact BI04 : Impacts to Waters of the United States, and Waters of the State The Project will temporarily or permanently impact seasonal wetland depressions, and perennial stream. These stream and wetland features are regulated by, and would require permits from, the Corps under Section 404 of the CWA, the RWQCB under section 401 of the CWA and the Porter -Cologne Water Quality Control Act, and in the case of the perennial stream, the CDFW under Sections 1600-1616 of the CFGC. Compensatory mitigation may be a conditional requirement of permits even though the project would be somewhat self -mitigating by creation of additional wetland habitat. Mitigation Measure 810-1: Impacts to Waters of the United States, and Waters of the State 31 Prior to filling of jurisdictional waters, or construction activities within Corps, RWQCB or CDFW jurisdiction, necessary regulatory permits will be obtained from the appropriate agencies. Regulatory permits to be obtained include a Corps Permit, Regional Water Quality Control Board Section 401 Water Quality Certification and/or Waste Discharge Requirement. Prior to proposed filling of jurisdictional waters, compliance with all regulatory agency permit conditions shall be demonstrated. Permanent impacts to jurisdictional wetlands will be mitigated at a minimum 1:1 ratio on a functions and values basis by: (1) restoring wetlands in the Study Area; (2) purchasing an appropriate amount of mitigation credits by an approved mitigation bank, or (3) another type of mitigation as approved by the Corps, RWQCB, and/or CDFW through the permitting process. With the implementation of these measures, the Project impact on waters of the U.S. and State will be less than significant. Potential Impact 810-2: Impacts to Riparian Vegetation The Project will impact riparian vegetation in the riparian red willow thicket community. Although this area will be re -planted and restored as part of the Project, there will be a temporary loss of habitat during construction and a reduction in habitat quality for the first few years following re- establishment. This habitat is regulated by CDFW under Sections 1600-1616 of the CFGC. Mitigation Measure 810-2: Impacts to Riparian Vegetation Prior to removing riparian vegetation or construction activities within CDFW or RWQCB jurisdiction, necessary regulatory permits will be obtained from the appropriate agencies. Regulatory permits to be obtained include a CFGC Section 1602 Streambed Alteration Agreement. The project shall comply with all regulatory agency permit conditions and compensatory mitigation measures as determined and required by regulatory agencies during permit authorization, but shall be no less than 1:1 replacement ratio. Mitigation options will include the following: (1) planting replacement riparian vegetation, (2) purchase of mitigation bank credits from an approved mitigation bank, and/or (3) paying an in -lieu fee to a natural resource agency or habitat resource organization. For habitat that is preserved and/or established for mitigation, a Habitat Mitigation and Monitoring Plan (HMMP) shall be prepared. The HMMP will include a detailed description of restoration/enhancement/preservation actions; restoration performance criteria for each biological parameter (i.e., native/invasive plants, wildlife use); and a monitoring/maintenance/reporting requirements for each biological parameter to evaluate restoration performance criteria. With the implementation of these measures, the Project impact on riparian vegetation will be less than significant. Potential Impact 810-3: Protected Tree Removal The Project will remove trees considered protected per the Petaluma Tree Ordinance, including but not limited to trees within the riparian area. The City may require mitigation for impacts to these trees. However, the mitigation and monitoring plan developed for federal and state permits may be sufficient to cover the mitigation requirements of the City. Mitigation Measure 810-3: Protected Tree Removal A permit from the City of Petaluma will be acquired for the removal of any protected tree. Conditions of approval may include tree replacement plantings or the payment of in -lieu fees. . With the implementation of these measures, the Project impact on protected trees will be less than significant. 32 5.3.2 Special -status Plant Species Potential Impact 810-4: Potential Impacts to Special -status Plant Species Six special -status plant species including pappose tarplant, congested -headed hayfield tarplant, Harlequin lotus, marsh microseris, cotula navarettia, and Gairdner's yampah have a moderate potential to occur in the Study Area based on the availability of suitable habitat, the presence of associated plant species, and the proximity to documented occurrences. The timing of the site visit was not sufficient to identify these species based on their documented bloom periods. Pappose tarplant, congested -headed hayfield tarplant, and marsh microseris are all CNPS Rank 1 B species, meaning that they are considered rare, threatened or endangered in throughout their range in California, and impacts to them must be considered under CEQA. In contrast, Harlequin lotus, cotula navarretia, and Gairdner's yampah all are ranked CNPS Rank 4. According to the CNPS guidelines (CNPS 2017b), few, if any, Rank 4 species are eligible for state listing under CESA; however, impacts may be considered significant under CEQA in special cases. Examples of impacts that may be considered significant under CEQA include: • Impacts to the type locality of a California Rare Plant Rank 4 plant; • Impacts to populations at the periphery of a species' range; • Impacts in areas where the taxon is especially uncommon; • Impacts in areas where the taxon has sustained heavy losses; or • Impacts to populations exhibiting unusual morphology or occurring on unusual substrates. If present in the. Study Area, impacts to the aforementioned special -status plant species could be significant under CEQA (criterion A). Mitigation Measure BIO -4: Potential Impacts to Special -status Plant Species Six special -status plant species have potential to occur in the Study Area. To avoid impacts to special -status plants, protocol -level surveys shall be conducted during the documented bloom period of the species. Two site visits, including one early -season (May), and one late -season (July) will be sufficient to cover the bloom periods of the six species with potential to occur. Survey timing may fluctuate based on blooming periods of appropriate reference site locations. If special -status plant surveys result in negative findings, no impacts would occur, and no mitigation would be required. However, if special -status plants are identified in the impact area, mitigation will be required. Mitigation will include avoidance, or if avoidance is not feasible, seeds collection and re-establishment at a minimum 1:1 ratio (number of plant established: number of plants impacted) in preserved, suitable habitat. Re-established populations shall be monitored annually in accordance with an approved HMMP for a minimum of five years. Reports describing performance results will be prepared and submitted for years 1, 3, and 5 during the monitoring period. With the implementation of these measures, the Project impact on special -status plants will be less than significant. 33 5.3.3 Special -status Wildlife Species Most of the species found in the review of background literature occur in habitats not found in the Study Area. Many special -status wildlife species that occur in the region of the Study Area are associated with coastal, vernal pools, friable soils, estuarine, or saline marsh habitats, none of which are found in or adjacent to the Study Area. Terrestrial habitats in the Study Area are disturbed, ruderal, fragmented, and are considered low -quality foraging habitat for most special - status species. The streambed is primarily composed of fine sediments and does not provide suitable spawning habitat for special -status fish species, though they may occasionally transit through the Study Area, The Petaluma River is managed as a flood conveyance structure and lacks structural complexity in comparison to natural rivers of its size and gradient and is more similar to a drainage ditch than a natural river. Riparian vegetation surrounding the streambed is moderately dense and may provide nesting/roosting and foraging habitat for a number of sensitive bird and bat species. Of the 84 special -status wildlife species known to occur in the greater vicinity of the Study Area, 19 were determined to have moderate or high potential to occur in the Study Area. One species, CRLF, was determined to be unlikely to occur in the Study Area, but avoidance is recommended out of an abundance of caution due to nearby occurrences. Each of the special -status species with a moderate or high potential (and CRLF) to occur in the Study Area is associated with arboreal, aquatic and/or riparian habitat; therefore, disturbance of these features should be avoided or minimized where feasible. Impact avoidance and minimization recommendations are discussed below. Potential Impact 810-5: Bats Six species of bat were determined to have a moderate potential to occur within the Study Area due to the presence of mature trees that may provide suitable roosting habitat and its proximity to water and suitable foraging habitat. Those species with potential to occur include: Townsend's big -eared bat, fringed myotis, hoary bat, long-legged myotis, western red bat and pallid bat. None of the bat species with potential to occur within the Study Area are state or federally listed as endangered, threatened or candidate for listing. Therefore, measures to avoid impacts to each bat species are equivalent and recommendations are outlined below. Mitigation Measure BIO -5: Bat Avoidance While trees are not typically used as hibernation roosts, mature oaks and other large trees on the property could potentially be used as day or maternity roosting sites by bats. All bat roosts, including those of non -special -status bats are protected by CDFW. To avoid impacts to roosting bats, any project activities that would impact potential bat roosts shall be initiated outside of the maternity roosting season (March 1 — July 31). If project work such as the felling of trees cannot occur outside of the maternity season, then a bat roost survey shall be conducted within 14 days prior to the start of such activities. Any structures or trees that are determined to support roosts shall have a 200400t no work buffer placed around them, and the buffer shall not be lifted until the maternity season has completed. In addition, when any large trees are removed, they shall be allowed to lie undisturbed on the ground for one night to allow any roosting bats to escape on their own before the trees are processed. With the implementation of these measures, the Project impact on bats will be less than significant. 34 Potential Impact BIO -6: Birds No special -status birds were observed in the Study Area during the site assessment. Seven special -status bird species have a moderate potential to occur in the Study Area and include: white-tailed kite, oak titmouse, Nuttall's woodpecker, Allen's hummingbird, rufous hummingbird, yellow warbler and yellow breasted chat. None of the bird species listed above are state or federally listed as endangered, threatened or candidates for listing. White-tailed kite is listed as a California fully protected species. This designation requires extra consideration for buffer zones around active nests, but otherwise requires protection and surveys to be completed in the same manner as other species listed above. Measures to avoid impacts to special -status birds as well as native nesting birds protected by the Migratory Bird treaty Act (MBTA) and by Fish and Game Code (CFGC) are similar, and general recommendations are outlined below. Mitigation Measure BIO -6: Bird Avoidance For the protection of special -status birds, and native nesting birds protected by the MBTA and CFGC, future Project activities shall occur outside of the nesting season from September 1 — January 31, to the extent feasible. If working outside of the nesting season is not possible, and project activities are initiated during the nesting season (February 1 — August 31), a qualified wildlife biologist shall conduct a nesting bird survey no more than 14 days prior to the start of Project activities. If no active nests are identified during the surveys, no impacts will occur to birds and work will progress without restriction. If active nests are identified, a no -disturbance buffer around the nest shall be implemented to avoid impacts to nesting birds. Buffers will be determined by a qualified biologist, and typically range from 25 feet to 500 feet depending on the species and protection status of that species. Once an active nest is determined to no longer be active, because of young fledging or predation, the buffer around the nest shall be removed and work shall progress without restriction. With the implementation of these measures, the Project impact on nesting and/or protected birds will be less than significant. Potential Impact BIO -7: Special -status fish Project work will require heavy equipment operation below the top of bank of the Petaluma River, which could temporarily impact special -status fish. The Petaluma River is designated critical habitat for California central coast chinook and California central coast steelhead. It is considered EFH for coho and chinook salmon, and special -status salmonids may be present. Despite thie EFH designation, Central Coast coho is considered extirpated from watersheds that drain into the San Francisco Bay. In order to prevent significant impacts to special -status fish, including salmonids, associated with work in the Petaluma River, the following measures shall be implemented. Mitigation measure 810-7: Special -status fish Aquatic habitat activities shall be completed during the dry season, between July 15 and October 1. Regulatory approval shall be obtained for all work within potentially jurisdictional areas from respective agencies. Approvals from the RWQCB, CDFW, and Corps are required based on project designs (City of Petaluma 2016). The Petaluma River is also designated critical habitat for California central coast chinook and California central coast steelhead, and is considered EFH for coho and chinook salmon. Therefore, it is likely that the Corps will consult with the USFWS 35 and NMFS for impacts to the Petaluma River. All work within these areas shall conform to any conditions imposed by the regulating agencies. Prior to construction, the contractor shall be required to prepare an Accidental Spill Prevention and Cleanup Plan. This plan shall include required spill control absorbent material, for use beneath stationary equipment, to be present on-site and available at all times. All refueling and maintenance of equipment, other than stationary equipment, shall occur at least 100 feet from the creek's top -of --bank. Refueling or maintenance of stationary equipment within the channel (top of bank to top of bank) shall only occur when secondary containment sufficient to eliminate escape of all potential fluids is in place. Any hazardous chemical spills shall be cleaned immediately. All stockpiling of construction materials, equipment, and supplies, including storage of chemicals, refueling and maintenance, with the exception of stationary equipment, shall occur outside the creek channel. No equipment shall be washed where runoff could enter the creek. No motorized equipment shall be left within the channel (top of bank to top of bank) overnight. Work shall be conducted in isolation from flowing water. Prior to the start of construction activities, the work area shall be isolated using temporary water diversion materials such as sand bags or other similar methods, and flowing water shall be temporarily diverted around the isolated area. If de -watering is necessary, pumps with 0.2 -inch mesh shall be used to remove standing water from the work area within the cofferdams to a filtration basin to prevent direct discharge into the creek. If a filtration basin is not available, filter bags will be placed surrounding the hose -release and the hose -release end shall be placed on a level area outside of the wetted creek channel to aHow water to settle prior to returning to the creek. No pumped water shall be directly discharged into the creek. Allowing the pumped water to settle in a filtration basin or release Z:) filter bags will prevent increase in turbidity or sediment loads during the de -watering process. If de -watering is necessary, a de -watering plan shall be submitted for agency approval. By implementing these measures, the Project's impacts to special -status fish, including salmonidsI shall be reduced to less than significant. Potential Impact 810-7: CRLF The Study Area contains potential aquatic habitat for California red -legged frog (Rana draytonii) (CRLF). Even though CRLF are unlikely to be present in the Study Area, if present, CRLF could be impacted by Project Activities. Mitigation Measure 810-7: CRLF Although the lack of upland habitat, lack of connectivity to suitable breeding habitat, intense flooding, sedimentation and introduced predators/competitors reduce the potential for CRLF to occur within the Study Area, measures to avoid CRLF impacts shall be implemented. The following measures shall be implemented to avoid CRLF and are in agreement with the measures described in the NLAA that was issued for this project (Corps 2016). An environmental awareness training for all crews working on the site shall include education on sensitive resources such as protected wildlife with the potential to occur within the area 36 (identification, regulatory status, natural history), water quality and environmental protection measures. Within 48 hours prior to any construction activities, a biologist approved by USFWS (Approved Biologist) shall conduct surveys for CRLF in and adjacent to the Action Area, 100 feet upstream and 100 feet downstream of the Study Area, The Approved Biologist shall have stop work authority to protect natural resources or ensure personal safety or the safety of workers. If CRLF are detected during surveys, work shall cease until consultation with the appropriate agencies can be completed. If no CRLF are found during the preconstruction surveys, the Study Area shall be surveyed each Jay prior to commencement of work by the Approved Biologist or a qualified biologist under the direction of the Approved Biologist to ensure that no CRLF are present in the Study Area until vegetation removal and exclusion fence installation are complete. After vegetation clearance and exclusion fence installation, activities may continue inside fenced areas without the presence of a biologist unless work is halted for more than 10 days, then a pre -construction survey for CRLF shall be conducted prior to re-initiation of work. All workers shall ensure that food scraps, paper wrappers, food containers, cans, bottles, and other trash from the work area are deposited in covered or closed trash containers. Trash in the containers shall be removed and disposed of off-site daily. Prior to the commencement of operation of wheeled or equipment with tracks in undisturbed areas, vegetation that could conceal CRLF shall be removed by hand under the supervision of a qualified biologist after the Approved Biologist has surveyed the area and determined it to be free of CRLF. If vegetation is too dense to be adequately surveyed (tall grasses, blackberry etc.), the Approved Biologist, at his or her discretion, may request that vegetation is cut to a height of 6-12 inches (and cut vegetation removed) prior to conducting a survey. If no CRLF are found, the vegetation shall be cut to ground level, and this shall ensure that no CRLF are harmed by cutting tools. Exclusion fence shall be installed around staging areas and Study Areas after vegetation removal is complete. A qualified biologist under direction of the Approved Biologist will oversee the installation of the fence. Once the fence is installed, the periodic inspections by the qualified biologist and construction contractor shall ensure that the fence is maintained effectively for the duration of the project. If exit/entries to the enclosed areas are required, they shall be closed at the end of work each day to ensure exclusion of CRLF overnight. Erosion control structures shall not include plastic or be of types that may entrap wildlife and shall be constructed of tightly woven natural fibers. All construction activities shall cease one half hour before sunset and shall not begin prior to one half hour before sunrise. Additionally, construction activities shall not occur during rain events or within 24 hours of events projected to deliver >0.2 inches of rain or within 24 hours after rain events exceeding 0.2 inches in measureable precipitation, as CRLF are most likely to disperse during periods of precipitation. No work shall occur after 0.5 inches of rain has occurred after November 1 in the year work is occurring. 37 Any open holes or trenches shall be covered or have escape ramps no steeper than 45 degrees installed at the end of each working day to prevent CRLF from becoming entrapped. With the implementation of these measures Cl" those described for special -status fish (BIO -7), any impacts to CRLF shall be avoided. Potential Impact 810-8: Pacific pond turtle Pacific pond turtle is listed as a species of special concern by CDFW. Project activities may temporarily impact individuals of the species during dispersal through upland areas, or if individuals are present during sediment removal or bank modification. Because the species is not listed as threatened or endangered, CDFW will not issue any permits for "take" of this species. However, the Project will occur in areas potentially occupied by Pacific pond turtle therefore, measures and recommendations to avoid impacts to Pacific pond turtle are outlined below. Mitigation Measure 810-8: Pacific pond turtle Prior to the initiation of Project work in the reservoir or banks of the reservoir, a qualified biologist shall conduct a preconstruction survey for pond turtles. If a pond turtle is found during surveys, the qualified biologist will relocate it outside of the Study Area, out of harm's way or it shall be allowed to move out of the area under its own power. With the implementation of these measures and those previously described for CRLF (13I0-7) and aquatic habitats (BIO -1 and BIO -2) (exclusion fence, work windows etc.), the impacts to Pacific pond turtle will be less than significant. Altman, B., and R. Sallabanks. 2000. Olive -sided Flycatcher (Contopus cooper). In The Birds of North America, No. 502 (A. Poole and F. Gill, eds.). The Birds of North America, Inc., Philadelphia, PA, Baldwin, B.G., D.H. Goldman, D.J. Keil, R. Patterson, T.J. Rosatti, and D.H. Wilken (eds.). 2012. The Jepson Manual: Vascular Plants of California, 2nd Edition. University of California Press, Berkeley, CA, Best, C. JT. Howell, W. Knight, I. Knight and M. Wells. 1996. A Flora of Sonoma County. California Native Plant Society, Sacramento, California. Burridge, Betty, ed. 1995. Sonoma County Breeding Bird Atlas. Madrone Audubon Society, Santa Rosa CA, California Department of Fish and Wildlife (CDFW). 2017. Natural Diversity Database, Wildlife and Habitat Data Analysis Branch. Sacramento. Most recently accessed: December 2017, California Department of Fish and Game (CDFG). 2009. List of California Vegetation Alliances, Biogeographic Data Branch. Vegetation Classification and Mapping Program. California Department of Fish and Game (CDFG). 2007. List of California Vegetation Alliances, Biogeographic Data Branch. Vegetation Classification and Mapping Program. California Department of Fish and Game ((,. DFG). 2003. List of California Terrestrial Natural Communities Recognized by the California Natural Diversity Database Wildlife and Habitat Data Analysis Branch, The Vegetation Classification and Mapping Program. California Department of Fish and Game (CDFG). Environmental Services Division (ESD). 1994. A Field Guide to Lake and Streambed Alteration Agreements, Sections 1600-1607, California Fish and Game Code. California Invasive Plant Council (Cal -IPC). 2017. California Invasive Plant Inventory Database, California Invasive Plant Council, Berkeley, CA. Online at: http://www.cal- ipc.org/ip/inventory/index.php. Most recently accessed: December 2017. California Native Plant Society (GNPs). 2017a. A Manual of California Vegetation, Online Edition, California Native Plant Society, Sacramento, CA. Available at: http://www,cnps.org/cnps/vegetation/ Most recently accessed: December 2017. California Native Plant Society (GNPs). 2017b. Inventory of Rare and Endangered Plants, California Native Plant Society, Sacramento, California. Available at: www.cnps.org/inventory. Most recently accessed: December 2017. California Soil Resources Lab (CSRL). 2017. Online Soil Survey. Online at: http://casoiIresource,lawr,ucdavis.edu/drupal. Most recently accessed: December 2017. 39 Caywood, M.L. 1974. Contributions to the life history Mine splittail Pogonichthys macrolepidotus (Ayres). M.S. Thesis. California State University, Sacramento. 77 pp. Cicero, C. 2000. Oak Titmouse (Baeolophus inornatus), The Birds of North America Online (A. Poole, Ed.). Ithaca: Cornell Lab of Ornithology; Retrieved from the Birds of North America Online: http://bna. birds,cornell.edu/bna/species/485a City of Petaluma. 2016. 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California's Wildlife, Volume 1 -III: Amphibians and Reptiles, Birds, Mammals. California Statewide Wildlife Habitat Relationships System, California Department of Fish and Game, Sacramento. 42 LIST OF OBSERVED PLANT AND WILDLIFE SPECIES r Q O U U U U U L LL LL c a) a) a) > > +a_ -0_ a 0 C (n � J J Cn L. � w O O O O^ O^ O^ O^ O^ O O^ O^ _C >_ a) .>_ a) .>_ a) >_ a) >_ a) .>_ a) .>_ a) .>_ () >_ >_ a) .>_ () m > m > m > m > (d > (B > (B > (B > (0 > (6 > ` a) c cn c fn cn a) • c cn a) C • C cn • C • c N m c a) a) a) C N • c to a) a) O > m m m > m> m I m I m I m I>> > m m>> c> c> c> c> c> c> c> c> c Y c> c> (u oc oc 0 m oc m oc o oc oc o m m m 0 0 m m c c c c �=Moo C: c c a) c0 Y .0 .0 ui a) a) a) (D a) cL Q c s n fl n a) L LD L E ro ro CL L `n c c c c m m io ME as MINIMIN c a) a) a) a) c c c () c c c a) c a) () a) L a) c O a) a) a) •� L > Y — OU fCO L C N O a) `U a) �C m mU) X a) p O 'C co c a) �c c O > m c C O O O C m C L O E O O E M.cn c U rn_Z3 u, U �_ r. m E O 1.co o o Q) c C a) O •C C N m O o L c o _ m V LL i i U m m m > LL U LL U m U Z3 to O co10 co Q co a a) co @ �) aU) co m n c Co m E o v n3 Q° � CO o Q o m `a_) o co a @ i o co m i to � E m v "- n3 E m a) :z Q L o oCJ a z2c c o c a) cn c n i ani c •Q Q a) a) E2 :wz Z3 U) I� U L.L.M.C Q U U= J m W Q Q c U W J o cf Q) a) (m) a) v m m a) m a) a) m ami () a) a) a) a) °) a)m a) m m a) aa)) am) am) m m m O um) 0 m m m m m >' U U U U U U U U Q- u) m a) a) a) a) a) _ U U co cLo ca cn cn cn a) L U U U U Z66 m m o a) a) a) a) m u) m c, m Q m m l m rn m LL Q Q Q Q Q Q ,a() Q Q Q m m m /a�) U U /Q� U W LL LL U.., LL r Q ma L 0 U /C' J U U U � U m Q Q Q (A) LL LL LL LL O LL LL LL LL LL LL LLLL LLL LLL C O a) O a) > V) (6 M N (ALO •� a) a I Y 1 1 1 I 1 1 I 1 1 1 1 1 I 1 U O O O J C (0 Y 1.6 y L.L r () a) (D a) ( a) >m > I>Q)> n � �� >� > i� : > m m o M•? is•? io•? m L (moo•? () a) (moo•? Fn a) a) 5i ICU: 2: 5-) N (a C (u•> C N C p C M > > > > > > C 1 C 1 C M > > C 1 C (o I (6 I (a > 1 1 ((f I c> c c c> c c> c> c> c c> c O c m m m m N N O O O C m m O O c O c O C m O O C O (Lf Y (0 (0 N ..Q m to C/) C N a) a) a) N (0 N N O N (1) () C) C: C) N N 01 _C .0 L C LM � m� m m IPIIII C c N c N c N c N c N c a) c N c c a) c a) c N c a) O O I. C (L) a) ) a) a) N(1) C (L) N (1) a ) a) C L C C a) a) C a) N a) J (B _C Q L Q. N O., Q Q Q Q m 01 N m Q Q (6 Jc Q. O.. 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N Q -p U 1. 1-1 Y Qm o N Q � \ \ � �f D.,\ ��I U) m' - a ==e 7cm7m%_ m:3==--_ :2�2\%g C: . o (ag .§ \ ==f%o e./ 0 g m m.c m0±5\\/ aS-KZ �%= &% Ole ooe = 5 ° � E E o \#�sey =/�\EaJ \.[��2 ® e a .. m»6 m P p C \�5>N==/ �=Pmc E m® o D m m[ o§[\°r0 E m o o Q Wo «200±±2 2\d\2.. /ƒ/ƒ\/\ Table A-2. Wildlife Species Observed in the Study Area on December 29, 2017 Common Name (status if applicable) Species BIRDS Anna's hummingbird Cal to anna Turkey vulture Cathartes aura American kestrel Falco s arverius California towhee Melozone crissalis Black phoebe Sa ornis nigricans Say's phoebe Sa ornis sa a MAMMALS Domestic cat Felix domesticus Raccoon (tracks) Procyon lotor Mule deer (tracks) Odocoileus hemionus INVERTEBRATES Red swamp crayfish (in scat) Procambarus clarkii A-2.1 APPENDIX B POTENTIAL FOR SPECIAL -STATUS PLANT AND WILDLIFE SPECIES TO OCCUR IN THE STUDY AREA •�' c � c c c W � m (1)Z0 to ma c L Q �, W o a) a) c o N d � O c cuEU En Z OU� U a) LL Q) (IN > u) QL,.�LD O U O _U 3 Eco (n '0 a) .> a Ca ro Q a) U) LU CSO .0 U V)�ULL Nm.0 u) j O Q O a) cn U) C U O L � a) a) Y � Q (p u) U) F- O a) U)da"Is �' m N m N LL U c N ❑ ID CL C/) Om (Doff❑ '=QF)❑ MINOR ° s� Z M U) U) (a No cu O N m 0 i �Q�>� MENEM :3 •� _U — L L u) Q�(Lamo �z Q +- o fdO O C 0LU +' •— p m O c �- (DU O U) oc_ m c N c X >`� _ O c a m � U Q0�� Q ol-a. m Z cn cn O Q o 0 0 o D o Z U N U a) U N w m "o m 70 (a o Oa) a) � a) U .� 0 U ,�- 0 'U 0 'U WO o CL O Q O o Cl Ix Z L in Z L (n Z L (n (n u) c T T (ALO QLn T U) O a) O O rn n a a) to Q E E (0 Ntf c _.(np O � O = 'X � UC°a MN COCN . -0 oO in ) o CO: m (D a) QauOa)��o CL U) a) p a) U n . 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' 'a _ cncOcr)c�m cUUUUUU cn�z moNe uE c a,Z E�'oIa 3 (a mu mco 0 N� > o 0 0 � CO szF,FFFF�� d o c� o mnQl— c cCO a� 02 0_ 0 o amici N o m +� U' ani a� 0•�s Qhs ami c >+LLULQ �QmQm (r aci c FANNIE 6. � c0 w �� (6 m u) �NNm)�t00 a�a. > w E E-0 EY a� U m 00 c( O E- C a mts .c � mn mn 0 U�cAcnUcrosm«sco«smamo��cyCO EL 0�._rn �cm(n0 cnU)U)UnmU��f-000 Z Z.) Mn mo=:c n QQZ APPENDIX C REPRESENTATIVE STUDY AREA PHOTOGRAPHS Photograph 1. Photograph depicting non-native grassland dominated by Harding grass (Phalaris aquatica) in the foreground, and riparian red willow thicket dominated by red willow (Salix laevigata) in the background in the east Study Area. Photograph 2. Photograph depicting a disturbed, roadside seasonal wetland depression dominated by Italian ryegrass (Festuca perennis) and curly dock (Rumex crispus) in the east Study Area. m�wra ENVIRONMENTAL CONSULTANTS Appendix C. Representative Study Area Photographs 1 a 3 � 4011 9 - - ;c'1 em _ `• _ _ • .. �!�'' � ALT' ..f � . p 4z Im F 41 ,• a a , 1 L ' h tog w b V3 wim w a -• srt.•,� •,,;ate="�`Y "w ~'.'•%1 ,ice a'�p :r r -. - - ali-e+ - \�• - *NO, r { «iib qtr'( _ ` • �t07 _ - ' -; :4 all e4. --dam; _�• - _ 4 4 y rJ jr q jt,� t A4 k T wit TU 41 WEST C on s u I ton 15. In c. rr-►a11•jlFjj Project: Denman Reach Basins and Corona Bridge Sediment Removal (Denman Reach Phase 4) QofESSIpN Subject: Results Summary ti 2 Date: July 26, 2018 ��, No. C056132 ren To: Jason Beatty, City of Petaluma EXP. 12/31/18 Tim Moresco, City of Petaluma From: David S. Smith, P.E., WEST Consultants, Inc. TF OF CAkA Amu This memo summarizes the analysis completed by WEST Consultants, Inc. (WEST) for the City of Petaluma (the City) to evaluate the combined effect of sediment removal in the channel in the vicinity of Corona Road and proposed detention basin at a property adjacent to the Petaluma River in the Denman Reach (south of Industrial Avenue bounded by Benson Road to the north/upstream and the 1129 Industrial Avenue building to the south/downstream). XP -Storm version 2010 (build May 20, 2010) was used in this evaluation. The XP -Storm model that was the basis of the FEMA submittal was modified for this analysis to include the following features: • ,Preferred landuse representing buildout (year 2025) conditions, consistent with the data uzed for the General Plan 2025 Environmental Impact Report hydraulic evaluation • Deer Creek development in vicinity of Petaluma River node pr_0460, consistent with model edits described in WEST's March 25, 2013 Deer Creek XP -Storm Evaluation • Denman Reach terracing (Corona Road to node pr_0670), consistent with model edits described in WEST's March 18, 2015 Phase 3 Denman Reach Terracing Hydraulic Evaluation • The effect of dredging removed from lower river reach (model cross sections modified to represent U.S. Army Corps of Engineer bathymetry dated September 2014, which essentially represents the existing "undredged" condition) • Revisions to Manning's n values to reflect current conditions (this will be described further in a future technical memo, along with a graphical comparison to the FEMA floodplain) July 26, 2018 Corona Road Sediment Removal In order to evaluate the effect of clearing sediment in the vicinity of Corona Road, WEST used data provided by the City to update the XP -Storm cross section data for existing and proposed (cleanout) conditions. New nodes were added at the proposed limits of grading at nodes pr_0609 and pr_0605 (see Figure 1). The model cross section data between nodes pr_0609 and pr_0605 were updated for both existing and proposed conditions. Survey data was provided by the City in the file "Future Corona X-Sec.xls" and representative cross sections within the XP -Storm model were selected as City cross sections 4, 3A, 2, and 1C. Cross section data for existing and proposed conditions corresponding to each model reach between node pr_0609 and pr 0605 are illustrated in Figures 2 through 5. The link representing the Corona Road bridge (pr_0607n to pr_0606n) is represented in XP -Storm as a user -defined relationship of depth, area, wetted perimeter, and top width based on the City -provided cross section data. Figure 1. XP -Storm Links and Nodes at Corona Road WEST Consultants, Inc. 2 of 7 25 20 m 15 0 10 w 5 0 0 20 40 60 80 Station (ft) 100 120 July 2612018 —� Future Existing Figure 2. Existing and Proposed Cross Sections - pr_0609 to pr_0608 (City ID #4) 30 25 \ $ c `T 10 w 20 40 60 80 Station (ft) 100 120 July 2612018 —� Future Existing Figure 2. Existing and Proposed Cross Sections - pr_0609 to pr_0608 (City ID #4) 3A 0 50 100 150 Station (ft) —� Future —� Existi ng Figure 3. Existing and Proposed Cross Sections - pr_0608 to pr_0607n (City ID #3A) WEST Consultants, Inc. 3 of 7 30 25 20 $ c 15 10 w 5 0 3A 0 50 100 150 Station (ft) —� Future —� Existi ng Figure 3. Existing and Proposed Cross Sections - pr_0608 to pr_0607n (City ID #3A) WEST Consultants, Inc. 3 of 7 35 30 G� G] 2 0 50 100 150 Station eft) July 2612018 � Future � Exi sti ng Figure 4. Existing and Proposed Cross Sections - pr_0607n to pr_0606n (City ID #2) 25 0 0 50 100 150 Station (ft) —� Future --�—Existing Figure 5. Existing and Proposed Cross Sections - pr_0606n to pr_0605 (City ID #1C) Denman Property Detention The Denman property (south of Industrial Avenue bounded by Benson Road to the north/upstream and the 1129 Industrial Avenue building to the south/downstream) will be utilized by the City to maximize the flood reduction benefit for the adjacent Denman Reach while avoiding water surface elevation increases downstream. Previous investigations by WEST have shown that additional widening/terracing of the channel in this reach would likely result in water surface elevation increases downstream. To confirm, WEST edited the Denman Terracing cross section shape at the property location to accommodate a wider terrace based on a preliminary concept provided by the City. Model results confirmed previous findings of water surface elevation increases downstream so this channel widening concept was abandoned. Previous studies have WEST Consultants, Inc. 4 of 7 20 15 0 10 v w 5 0 0 50 100 150 Station (ft) —� Future --�—Existing Figure 5. Existing and Proposed Cross Sections - pr_0606n to pr_0605 (City ID #1C) Denman Property Detention The Denman property (south of Industrial Avenue bounded by Benson Road to the north/upstream and the 1129 Industrial Avenue building to the south/downstream) will be utilized by the City to maximize the flood reduction benefit for the adjacent Denman Reach while avoiding water surface elevation increases downstream. Previous investigations by WEST have shown that additional widening/terracing of the channel in this reach would likely result in water surface elevation increases downstream. To confirm, WEST edited the Denman Terracing cross section shape at the property location to accommodate a wider terrace based on a preliminary concept provided by the City. Model results confirmed previous findings of water surface elevation increases downstream so this channel widening concept was abandoned. Previous studies have WEST Consultants, Inc. 4 of 7 July 26, 2018 aISO shown that detention is beneficial in this reach of the Petaluma River, therefore WEST modeled proposed detention on the site. The recommended detention basin concept consists of a weir (such as a berm or a trail) that is high enough to prevent low flows from filling the basin, but not so high that the basin would remain dry when urban flooding occurs. The detention area would only fill when the weir is overtopped, thus capturing peak flows rather than the rising limb of the flow hydrograph. Detained water would flow back to the river through a single 18 -inch pipe equipped with a flap gate to aHow flow from the basin to the river, but not the other direction. The City recommended two separate detention areas on the property to avoid utility conflicts each with a single 18 -inch culvert for draining), as illustrated in Figure 6. EVE �All A - -.R; 1. rl# All Al I � VA All A A- ~• •n-�`~ allL AMF A dr IAM i 1 i - -. vLr S�I. F ' Figure 6. Approximate Detention Basin Layout The 100 -year XP -Storm model for this study including the detention areas was named "PrefLU100yr_DeerDenman "All sed_CoronaProp_det_6-14-18.xp" and the model without detention or Corona Road sediment removal was named "PrefLU100yr_DeerDenman_sed_Corona_4-12-18.xp." In XP -Storm, the two detention areas were named Bensonl and Benson2. The geometry of the detention basins was provided by the City and is summarized in Table 1 and the XP -Storm model elements are illustrated in Figure 7. The lateral weir dimensions are also provided in Table 1. The elevations of the weirs were determined by trial and error to maximize the beneficial impact of the detention concept. Model runs revealed that higher water surface elevation reductions occur with longer weirs, so the weir lengths shown in Table 1 represent the maximum feasible lengths given the site limitations. WEST Consultants, Inc. 5 of 7 July 26, 2018 Table L. Detention Basin Storage -Elevation and Weir Data Bensonl Benson2 XP Detention Basin Elevation Area XP Detention Basin Elevation Area Depth (ft) Elevation (ft, NAVD88) Area (ac) Depth (ft) Elevation (ft, NAVD88) Area (ac) 0 26 0.849 0 26 1.2 1 27 0.908 1 27 1.259 2 28 0.968 2 28 1.318 3 29 1.027 3 29 1.377 4 30 1.087 4 30 1.436 5 31 1.146 5 31 1.495 6 32 1.147 6 32 1.496 7 33 1.148 7 33 1.497 8 34 1.149 8 34 1.498 9 35 1.15 9 35 1.499 XP User Defined Weir Dimensions XP User Defined Weir Dimensions Depth (ft) Elevation (ft, NAVD88) Length (ft) Depth (ft) Elevation (ft, NAVD88) Length (ft) 4.5 30.5 130 4 30 200 5.8 31.8 185 5.8 31.8 272 Figure 7. Denman Property Detention XP -Storm Model Geometry WEST Consultants, Inc. 6 of 7 July 2b, 2018 Results The 25- and 100 -year rainfall events were used to evaluate the effectiveness of the combined projects (Corona Road sediment removal and Denman property detention). Preliminary model runs revealed that the detention project by itself provided a minimal water surface reduction, and the Corona Road sediment removal project by itself provided a larger water surface reduction with the consequence of slightly increased flows downstream. When the two projects were combined, any increases downstream due to the sediment removal project were eliminated for the 100 -year event with a net result of decreased peak flow and water surface elevations. For the 25 -year event there is a slight increase in water surface elevation downstream of Corona Road at the Corona Creek confluence gradually increasing to a maximum increase of 0.1 feet near the constriction weir, and then decreasing again from that point down zero increase near Adobe Creek. The reason for the increase with the 25 -year event and not the 100 -year is due to the lower utilization of the detention basins for the smaller event. However, lowering the weir elevations at the detention basins is not advised because the benefits achieved for the 100 -year event would be reduced. Tabular comparisons of model results with and without the combined project for the 25- and 100 -year events are provided in Tables 2 and 3. The combined project provides reductions in water surface elevation up to about 0.9 feet upstream of Corona Road for the 100 -year event and up to about 0.7 feet for the 25 -year event. The attached flood boundary map exhibit illustrates the reduction due to the combined projects for the 100 -year event. WEST Consultants, Inc. 7 of 7 Table 2. 25 -Year XP -Storm Results Comparison Base Conditions vs. Combined Project (Corona Road Sediment Removal and Denman Property Detention) Difference Base Det Difference Link ID •-. U/S Node D/S Node Base • Det Ipr_0020 pr_0020 pr_0010 9399 9401 2 6.53 6.53 Ipr_0030 pr_0030 pr 0020 9399 9401 2 6.61 6.61 Ipr_0040 pr_0040 pr_0030 9398 9401 2 6.68 6.68 Ipr_0050 pr_0050 pr_0040 8213 8211 -1 6,79 6.79 Ipr_0060 pr_0060 pr_0050 8205 8203 -1 6.84 6.84 Ipr_0070 pr_0070 pr 0060 8197 8196 -1 7.05 7.05 Ipr_0080 pr_0080 pr_0070 8192 8190 -1 7.11 7.11 Ipr_0090 pr 0090 pr_0080 8184 8182 -1 7.18 7.18 Ipr_0100 pr_0094 pr_0090 7718 7788 70 7.21 7.21 Link1230 pr_0096 pr_0094 7717 7787 70 7.33 7.34 0.01 Link1229 pr_0098 pr 0096 7717 7787 70 7.39 7.41 0.01 Link1228 pr 0100 pr_0098 7717 7787 70 7.44 7.46 0.01 Ipr_0110 pr 0110 pr_0100 7701 7770 70 7.52 7.53 0101 Ipr_0120 pr_0120 pr_0110 7700 7770 70 7.54 7.56 0101 Ipr_0130 pr 0130 pr_0120 7700 7770 70 7.61 7.62 0101 Ipr_0140 pr_0140 pr_0130 7700 7769 70 7.67 7.68 0,02 Ipr_0150 pr_0150 pr_0140 7699 7769 70 7.77 7.79 0.02 Ipr_0160 pr_0160 pr_0150 7574 7644 70 7.92 7.94 0.02 1pr_0170 pr_0170 pr_0160 7573 7643 70 7.98 8.00 0.02 Ipr_0180 pr_0180 pr_0170 7561 7630 70 8.05 8.07 0.02 Ipr_0190 pr_0190 pr_0180 7561 7630 70 8,11 8.13 0.02 Ipr_0195 pr_0195 pr 0190 7559 7628 70 8.28 8.30 0.03 Ipr_0200 pr_0200 pr_0195 7224 7293 70 8.40 8.43 0.03 Link1239 pr_0206 pr_0200 7205 1 7275 70 8.43 8,46 0.03 Ipr_0208 pr_0208 pr 0206 7206 7275 69 8.61 8.64 0.03 Ipr_0210 pr_0210 pr_0208 7206 7275 69 8.64 8,67 0.03 Ipr_0220 pr_0220 pr_0210 7196 7265 69 8.69 8.72 0.03 Ipr_0230 pr 0230 pr_0220 7196 7265 69 8.69 8.72 0.03 Ipr_0240 pr_0240 pr 0230 7196 7265 69 8.70 8.73 0.03 Ipr_0250 pr_0250 pr_0240 7197 7266 69 8.70 8.73 0.03 Ipr_0260 pr_0260 pr_0250 7197 1 7266 69 8.71 8.74 0.03 Ipr_0270 pr_0270 pr 0260 7197 7266 70 8.73 8,76 0.03 Ipr_0280 pr_0280 pr_0270 7197 7267 69 8.75 8,78 0.03 Ipr_0290 pr 0290 pr_0280 7197 7266 69 8.59 8,62 0.03 Ipr_0298 pr_0298 pr 0290 7091 7160 69 9,14 9.17 0.04 Ipr_0300 pr_0300 pr_0298 7090 7160 69 9.32 9.36 0.04 Ipr_0308 pr_0308 pr 0300 7091 7160 70 9.61 9.65 0.04 Ipr_0310 pr_0310 pr_0308 7091 7160 69 9.77 9.81 0.04 Ipr_0320 pr 0320 pr 0310 7091 7160 69 9466 9.70 0.04 Ipr_0322 pr_0322 pr 0320 5472 5472 19.42 19.42 Ipr_0330 pr_0330 pr_0320 7090 7160 70 9.81 9.85 0,04 Ipr_0338 pr_0338 pr 0330 7064 7134 70 10.23 10.28 0,05 Ipr_0340 pr_0340 pr_0338 7064 7134 70 10.55 10.60 0105 Ipr_0350 pr 0350 pr_0340 7064 7134 70 10.93 10.98 0.05 Ipr_0360 pr_0360 pr_0350 7064 7134 70 12.25 12.30 0,05 Ipr_0370 pr_0370 pr_0360 7003 7073 70 13.01 13.06 0105 Ipr_0380 pr_0380pr_0370 7003 7073 70 13.56 13.61 0,05 Ipr_0390 pr_0390 pr_0380 6157 6228 71 14.39 14,45 0,06 Ipr_0400 pr_0400 pr 0390 5488 5526 38 14,59 14,65 0.06 Ipr_0410 pr_0410 pr_0400 60 60 21.97 21.97 Ipr_0420 pr_0420 pr_0400 5487 5524 37 14,84 14.91 0.07 Ipr_0430 pr 0430 pr 0420 5487 5524 37 15.03 15.10 0.07 Ipr_0440 pr 0440 pr_0430 5486 5522 36 16.79 16.88 0.09 Table 2. 25 -Year XP -Storm Results Comparison Base Conditions vs. Combined Project (Corona Road Sediment Removal and Denman Property Detention) Link ID •- U/S Node D/S Node Base Det Difference Base Det Difference Ipr_0445 pr 0445 pr_0440 5484 5517 33 17.25 17.32 0.07 Ipr_0448 pr 0448 pr_0445 5482 5514 32 17.40 17.47 0.07 Ipr_0450 pr_0450 pr_0448 5481 5511 30 17.54 17.60 0.07 1pr_0452 pr_0452 pr 0450 5479 5508 29 17.64 17.70 0.06 Ipr_0458 pr_0458 pr_0452 5478 5506 28 17.85 17.91 0.06 Ipr_0460 pr_0460 pr_0458 5477 5505 28 17.95 18.00 0.06 Ipr_0465 pr_0465 pr_0460 5441 5468 27 18.13 18.19 0.05 Ipr_0470 pr_0470 pr_0465 5441 5467 26 18.23 18.28 0.05 Ipr_0480 pr_0480 pr 0470 5440 5466 26 18.46 18.51 0.05 Ipr_0490 pr_0490 pr_0480 5439 5465 26 18.93 18.97 0.05 Ipr_0496 pr 0496 pr_0490 5439 5465 26 19.09 19.13 0.04 1pr_0498 pr 0498 pr_0496 5439 5465 26 19.79 19.83 0.04 Ipr_0500 pr_0500 pr_0498 5439 5465 26 19.91 19.95 0.04 Ipr_0510 pr_0510 pr_0500 5439 5465 27 20.38 20.42 0,04 Ipr_0520 pr_0520 pr 0510 5395 5423 28 20.83 20.87 0.04 Ipr_0530 pr_0530n pr_0520 5396 5427 31 21.90 21.94 0.04 1pr_0540 pr_0540n pr_0530n 5397 5431 34 22.95 22.99 0.04 Ipr_0550 pr_0550 pr_0540n 4871 4900 28 24.00 24.03 0.03 Ipr_0552 pr_0552 pr_0550 4874 4905 31 24.09 24.12 0.03 3876.1 pr 0554 pr_0552 5097 5154 57 24.06 24.09 0.03 3876.2 pr_0554 pr_0552 -224 -252 -28 24.06 24.09 0.03 Ipr_0560 pr 0560 pr_0554 4877 4913 36 24.56 24.59 0.03 Ipr_0570 pr 0570 pr 0560 4888 4958 70 25.13 25.15 0.02 Ipr_0580 pr_0580 pr_0570 4964 5054 90 25.73 25.75 0.02 Ipr_0590 pr 0590n pr 0580 4825 4917 92 27.42 27.44 0.02 Ipr_0600 pr_0600n pr 0590n 4972 4939 -33 27.80 27.80 Ipr_0605 pr_0605 pr_0600n 4902 4867 -36 27.84 27.84 Ipr_0606 pr_0606n pr 0605 4903 4865 -38 27.97 27.91 -0.06 UWCorona pr_0607n pr_0606n 0 0 2150.1 pr 0607n pr_0606n 4903 4865 -38 28.626 28.069 -0.56 Ipr_0608 pr_0608n pr_0607n 4903 4865 -38 28.721 28.107 -0.61 Ipr_0609 pr 0609 pr_0608n 4003 3894 -109 28.892 28.179 -0.71 Ipr_0610 pr_0610n pr_0609 3992 3888 -104 29.201 28.511 -0.69 Ipr_0612 pr_0612n pr_0610n 3973 3876 -96 29.376 28.789 -0.59 Ipr_0614 pr_0614n pr_0612n 3955 3866 -89 29.61 29.047 -0.56 1pr_0616 pr 0616n pr_0614n 3916 3835 -80 29.724 29.19 -0.53 Ipr_0618 pr 0618n pr_0616n 3887 3821 -66 29.961 29,544 -0.42 Ipr_0620 pr_0620n pr 0618n 3861 3808 -53 30.347 30.047 -0.30 Ipr_0630 pr_0630n pr_0620n 3856 3800 -56 30.763 30.436 -0.33 Ipr_0640 pr_0640n pr_0630n 3856 3858 2 30.975 30.661 -0.31 1pr_0650 pr_0650 pr_0640n 3856 3875 19 31.042 30.742 -0.30 Ipr_0660 pr_0660 pr 0650 3861 3876 15 31.122 30.834 -0.29 Ipr_0670 pr_0670n pr_0660 3869 3878 9 31.796 31.576 -0.22 Ipr_0680 pr_0680n pr_0670n 3851 3858 6 31.935 31.731 -0.20 6821ob pr 0682 pr_0680n 0 0 15.7 15.7 2792.1 pr 0682 pr_0680n 3854 3858 4 32.069 31.871 -0.20 6841ob pr 0684 pr_0682 0 0 15.89 15.89 2791.1 pr_0684 pr_0682 3855 3859 4 32.233 32.047 -0.19 Ipr_0690 pr 0690n pr 0684 3855 3859 4 32.338 32.16 -0.18 Ipr_0700 pr_0700 pr_0690n 3859 3860 1 32.813 32.717 -0.10 Ipr_0710 pr 0710 pr 0700 3860 3861 35.168 35.126 -0.04 Ipr_0720 pr 0720 pr 0710 3824 3824 36.011 35.988 -0.02 L1208 pr 0720 det 4 375 375 35.504 35.504 Table 2. 25 -Year XP -Storm Results Comparison Base Conditions vs. Combined Project (Corona Road Sediment Removal and Denman Property Detention) Link ID U/S Node D/S Node Base Det Difference Base Det Difference Ipr_0723 pr_0723 pr 0720 3825 3825 37.247 37.244 3663.1 pr_0725 pr_0723 1936 1931 -6 37.525 37.523 3663.2 pr 0725 pr_0723 2786 2786 37.525 37.523 Ipr_0730 pr_0730 pr 0725 3825 3826 37.682 37.682 Ipr_0740 pr_0740 pr_0730 3867 3867 37.987 37.986 2526.1 pr_0745 pr_0740 3173 3174 38.366 38.366 2526.2 pr_0745 pr_0740 694 694 38.366 38.366 Ipr_0750 pr_0750 pr_0745 3867 3867 38.694 38.694 Ipr_0760 pr 0760 pr_0750 3867 3867 38.84 38.84 3of3 Table 1100 -year XP -Storm Results Comparison Base Conditions vs. Combined Project (Corona Road Sediment Removal and Denman Property Detention) /S Node D/S Node Base Det Difference Base Det Difference 77rr,0040 pr 0020 pr_0010 11730 11721 -9 6.53 6.53 r_0030 pr_0020 11730 11721 -9 6.65 6.65 pr 0030 11730 11721 -9 6.76 6.76 Ipr_0050 pr_0050 pr_0040 10961 10920 -42 6.98 6.97 Ipr_0060 pr_0060 pr_0050 10942 10898 -43 7.08 7.08 Ipr_0070 pr_0070 pr_0060 10941 10897 -43 7.39 7.39 Ipr_0080 pr 0080 pr 0070 10940 10897 -43 7.50 7.49 Ipr_0090 pr_0090 pr 0080 10939 10896 -44 7.87 7.83 -0.03 Ipr_0100 pr 0094 pr 0090 10581 10520 -61 7.91 7.88 -0.03 Link1230 pr_0096 pr_0094 10584 10522 -62 8.15 8.12 -0.03 Link1229 pr_0098 pr_0096 10585 10522 -62 8.25 8.21 -0.03 Link1228 pr_0100 pr_0098 10586 10523 -63 8.33 8.29 -0.03 Ipr_0110 pr 0110 pr 0100 10568 10504 -64 8.44 8.40 -0.03 Ipr_0120 pr_0120 pr_0110 10571 10505 -65 8.47 8.43 -0.03 Ipr_0130 pr 0130 pr_0120 10573 10507 -66 8.56 8.53 -0.03 Ipr_0140 pr_0140 pr 0130 10576 10509 -67 8.65 8.62 -0.03 Ipr_0150 pr_0150 pr_0140 10579 10511 -68 8.80 8.76 -0.03 Ipr_0160 pr 0160 pr_0150 10451 10381 -70 9.01 8.98 -0.03 Ipr_0170 pr_0170 pr 0160 10458 10387 -71 9.09 -0.03 Ipr_0180 pr_0180 pr_0170 10446 10376 -71 9.19 -0.03 Ipr_0190 pr_0190 pr 0180 10450 10379 -71 9.27 a9m68 -0.03 Ipr_0195 pr 0195 pr_0190 10456 10385 -71 9.54 -0.04 Ipr_0200 pr 0200 pr_0195 10130 10059 -71 9.72 -0.04 Link1239 pr_0206 pr 0200 10112 10040 -72 9.76 9.73 -0.04 Ipr_0208 pr_0208 pr_0206 10113 10041 -72 10.08 10.04 -0.04 Ipr_0210 pr_0210 pr 0208 10116 10044 -72 10.19 10.14 -0.04 Ipr_0220 pr 0220 pr_0210 10108 10037 -71 10.33 10.28 -0.04 Ipr_0230 pr 0230 pr_0220 10114 10043 -71 10.34 10.30 -0.04 Ipr_0240 pr_0240 pr_0230 10121 10050 -70 10.35 10.31 -0.05 1pr_0250 pr 0250 pr_0240 10126 10057 -69 10.36 10.31 -0.04 Ipr_0260 pr_0260 pr_0250 10129 10060 -69 10.37 10.32 -0.04 Ipr_0270 pr 0270 pr_0260 10132 10064 -68 10.39 10.34 -0.04 Ipr_0280 pr_0280 pr_0270 10134 10067 -68 10.41 10.36 -0.04 Ipr_0290 pr_0290 pr 0280 10136 10069 -67 10.21 10.17 -0.04 Ipr_0298 pr_0298 pr 0290 10007 9940 -67 10.89 10.84 -0.05 Ipr_0300 pr_0300 pr_0298 10009 9943 -66 11.11 11.06 -0.05 Ipr_0308 pr_0308 pr 0300 10013 9948 -66 11.50 11.45 -0.05 Ipr_0310 pr_0310 pr_0308 10018 9952 -65 11.67 11.62 -0.05 Ipr_0320 pr_0320 pr 0310 10019 9954 -65 11.52 11.47 -0.05 Ipr_0322 pr 0322 pr 0320 5472 5472 19.42 19.42 Ipr_0330 pr_0330 pr_0320 10021 9956 -65 11.70 11.65 -0.05 Ipr_0338 pr 0338 pr_0330 9991 9925 -65 12.23 12.17 -0.05 Ipr_0340 pr_0340 pr 0338 9991 9926 -65 12.58 12.53 -0.05 Ipr_0350 pr_0350 pr 0340 9994 9928 -65 12.97 12.92 -0.05 Ipr_0360 pr 0360 pr 0350 9997 9931 -66 14.35 14.30 -0.05 Ipr_0370 pr_0370 pr_0360 9924 9859 -65 15.17 15.11 -0.05 Ipr_0380 pr_0380 pr_0370 9925 9860 -65 15.78 15.73 -0.05 Ipr_0390 pr_0390 pr_0380 8661 8543 -118 16,59 16.52 -0.07 Ipr_0400 pr 0400 pr_0390 7810 7690 -120 16.82 16.75 -0.07 Ipr_0410 pr_0410 pr_0400 60 1 60 1 21.97 21.97 Ipr_0420 pr_0420 pr_0400 7808 7688 -120 17.14 17.06 -0.08 Ipr_0430 pr_0430 pr_0420 7807 7687 -120 17.38 17.30 0.09 Ipr_0440 pr_0440 pr 0430 7802 7682 -120 1 18.87 1 18.80 -0.07 Table 1100 -year XP -Storm Results Comparison Base Conditions vs. Combined Project (Corona Road Sediment Removal and Denman Property Detention) 2of3 Base Det Difference 1DU/S Node D/S Node Base • Det Difference 7••, pr_0445 pr0440 7799 7679 -120 19.20 19.13 -0.07 pr_0448 pr0445 7797 7677 -120 19.32 19.25 -0.07 pr_0450 pr_0448 7797 7676 -121 19.43 1936 -0.07 1pr_0452 pr 0452 pr_0450 7798 7676 -122 19.51 19.44 -0.07 Ipr_0458 pr_0458 pr_0452 7800 7678 -122 19.69 19.62 -0.07 Ipr_0460 pr_0460 pr_0458 7803 7679 -123 1937 1930 -0.07 Ipr_0465 pr_0465 pr_0460 7762 7638 -124 19,93 19.86 -0.07 Ipr_0470 pr_0470 pr 0465 7766 7641 -125 20.01 19.94 -0.07 Ipr_0480 pr_0480 pr_0470 7769 7644 -126 20.25 20.18 -0.07 Ipr_0490 pr_0490 pr_0480 7775 7648 -127 20.63 20.56 -0.07 Ipr_0496 pr_0496 pr_0490 7780 7652 -128 20,74 20.68 -0.07 Ipr_0498 pr_0498 pr_0496 7783 7655 -129 21.69 21.61 -0.08 Ipr_0500 pr_0500 pr_0498 7784 7655 -129 21.84 21.75 -0.08 Ipr_0510 pr_0510 pr_0500 7788 7659 -130 22,24 22.16 -0.08 Ipr_0520 pr_0520 pr 0510 7748 7615 -133 22.66 22.59 -0.07 Ipr_0530 pr_0530n pr_0520 7768 7631 -137 23.75 23.68 -0.07 Ipr_0540 pr 0540n pr_0530n 7778 7639 -139 24.69 24.63 -0.06 Ipr_0550 pr 0550 pr_0540n 7130 6988 -142 25.86 25.81 -0.05 Ipr_0552 pr_0552 pr_0550 7138 6994 -144 25.95 25.90 -0.05 3876.1 pr_0554 pr_0552 6205 6214 10 25.97 25.93 -0.05 3876.2 pr_0554 pr_0552 2051 1964 -88 25.97 25.93 -0.05 Ipr_0560 pr_0560 pr 0554 7151 7006 -145 -26.26 26.21 -0.05 Ipr_0570 pr 0570 pr_0560 6740 6603 -136 26.56 26.52 -0.05 Ipr_0580 pr_0580 pr_0570 6761 6616 -145 26.88 26.83 -0.05 Ipr_0590 pr_0590n pr_0580 6318 6189 -128 28.04 28.01 -0.03 Ipr_0600 pr_0600n pr_0590n 6156 6104 -51 28.35 28.32 -0.03 Ipr_0605 pr 0605 pr_0600n 6045 5999 -46 28.40 28.37 -0.03 Ipr_0606 pr_0606n pr 0605 6031 5989 -42 28.55 28.45L-E06866 UWCorona pr 0607n pr_0606n 0 0 2150.1 pr_0607n pr_0606n 6028 5987 -41 29.575 28.766 Ipr_0608 pr_0608n pr_0607n 6027 5986 -41 29.68 28.815Ipr_0609 pr_0609 pr0608n 4932 4873 -59 29.808 28.909 Ipr_0610 pr 0610n pr_0609 4925 4869 -56 30.054 29.352 -0.70 Ipr_0612 pr_0612n pr_0610n 4919 4866 -54 30.181 29.581 -0.60 Ipr_0614 pr_0614n pr_0612n 4913 4862 -51 30.476 29.928 -0.55 Ipr_0616 pr_0616n pr_0614n 4881 1 4834 -48 30.586 30.08 -0.51 Ipr_0618 pr_0618n pr 0616n 4875 4832 -43 30.751 30.34 -0.41 Ipr_0620 pr_0620n pr_0618n 4872 4831 -40 31.063 30.763 -0.30 Ipr_0630 pr_0630n pr 0620n 4873 4836 -38 31.601 31.397 -0.20 Ipr_0640 pr_0640n pr 0630n 4862 4832 -30 32.023 31.795 -0.23 Ipr_0650 pr_0650 pr 0640n 4868 4834 -34 32.081 31.858 -0.22 Ipr_0660 pr_0660 pr 0650 4877 4848 -29 32.134 31.921 -0.21 Ipr_0670 pr_0670n pr_0660 4894 4879 44 32.882 32.707 -0.17 Ipr_0680 pr_0680n pr_0670n 4878 4870 -8 33.003 32.839 -0.16 6821ob pr_0682 pr_0680n 0 0 15.7 15.7 2792.1 pr_0682 pr 0680n 4883 4882 -1 33.332 33.126 -0.21 684lob pr 0684 pr 0682 57 3 -54 15.89 15.89 2791.1 pr_0684 pr 0682 4856 4884 28 33.654 33.399 -0.26 Ipr_0690 pr 0690n pr_0684 4891 4887 -4 33.748 33.513 -0.23 Ipr_0700 pr 0700 pr_0690n 4909 4913 3 33.911 33.704 -0.21 Ipr_0710 pr 0710 pr_0700 4924 4927 3 35.76 35.735 -0.02 Ipr_0720 pr_0720 pr 0710 4886 4889 3 36.779 36.743 -0.04 L1208 pr_0720 det 4 375 375 35.504 35.504 2of3 Table 3. 100 -year XP -Storm Results Comparison Base Conditions vs. Combined Project (Corona Road Sediment Removal and Denman Property Detention) Link ID U/S Node D/S Node Base Det Difference Base Det Difference Ipr_0723 pr 0723 pr_0720 4892 4894 2 37.514 37.504 -0.01 3663.1 pr 0725 pr_0723 3657 3628 -30 37.632 37.628 3663.2 pr_0725 pr 0723 2784 2784 37.632 37.628 Ipr_0730 pr_0730 pr_0725 4893 4895 1 37.78 37.778 Ipr_0740 pr 0740 pr_0730 4833 4835 1 38.184 38.183 2526.1 pr_0745 pr 0740 3487 3489 2 38.733 38.733 2526.2 pr_0745 pr_0740 1347 1346 -1 38.733 38.733 Ipr_0750 pr_0750 pr_0745 4834 4835 1 39.226 39.226 Ipr_0760 pr 0760 pr 0750 4834 4835 1 39.392 39.392 1 FIq r ' Mall. �. r c:: 411%m.i ,^ 'r � •f NM f�` ��:..