Loading...
HomeMy WebLinkAboutStaff Report 5.A 5/19/2014(i) DATE: May 19, 2014 TO: Honorable Mayor and Members of the City Council through City Manager FROM: DanOtCFACE —Director, Public Works &Utilities Larrmer, P.E. — Capital Improvements Division Manager SUBJECT: Resolution Adopting a Mitigated Negative Declaration and Approving the Capri Creek Flood Reduction and Habitat Enhancement Project, with the incorporation of mitigation measures, located along Sunrise Parkway and Woodside Circle between North McDowell Boulevard and Maria Drive RECOMMENDATION It is recommended that the City Council adopt the attached Resolution Adopting a Mitigated Negative Declaration (MND) and Approving the Capri Creek Flood Reduction and Habitat Enhancement Project, with the incorporation of mitigation measures, located along Sunrise Parkway and Woodside Circle between North McDowell Boulevard and Maria Drive. BACKGROUND The proposed project will create a flood terrace and restore the existing straight channel to a more natural, creek corridor along the section of Capri Creek between North McDowell Boulevard upstream to Maria Drive. The project is intended to reduce out -of -bank flooding during both low and higher intensity storm events. The recommended action is to address the CEQA steps triggered by the project. On February 25, 2013, the City Council adopted Resolution No. 2013-017 N.C.S. supporting submittal of a grant application for Proposition 84 funds in the amount of $825,000 through the Bay Area Integrated Regional Water Management Program (BAIRWMP) for the Capri Creek Flood Reduction/Environmental Enhancement Project. The City was notified of the full award in February 2014. On April 8, 2014, the Planning Commission conducted a public hearing to hear comment on the proposed mitigated negative declaration or for the project as a whole. The Commission received public comments from one citizen who resides in the Payran Reach neighborhood. The Commission unanimously recommended that the City Council approve the MND. During their deliberation the Comrnission had questions and comments, which are reflected in the attached Commission Resolution and Mitigation Measures. Agenda Review: i City Attorney Finance Director City Manager '� The proposed action item meets Council Goal: "Maintain a safe Petaluma". The project proposes to: 1) Increase hydraulic capacity within the channelized creek section between North McDowell Boulevard and Maria Drive (see location map, Exhibit 1, and photo, Exhibit 2, looking downstream from Maria Drive). The project is intended to achieve the highest possible reduction of out -of -bank flooding during a 100 -year storm event through the creation of a mid -line flood terrace; 2) Create sediment and debris removal basin just upstream of N. McDowell Boulevard to facilitate routine maintenance and emergency flood response to debris blockages; 3) Conduct Revegetation and Habitat Enhancement to follow grading activities for the flood terrace, including placement of trees and native shrubs along the south bank of the newly recontoured creek section. This growth will facilitate shading of the low flow and flood terrace and provide habitat for birds, riparian mammals and other species; and 4) Stewardship through education and outreach into neighboring residential areas. The City owns all three parcels containing the project area. The existing community garden along Sunrise Parkway was designed and located to respect the preliminary area designated for the flood reduction and restoration work for the creels corridor, and therefore will not be disturbed or impacted. The attached Planning Commission report provides the staff analysis on the project's compliance and applicability to the General Plan 2025 and the City Zoning Ordinance. An Expanded Initial Study was prepared and made available for public review with a notice circulated to announce the 30 day review period. The notice was published in the local newspaper and mailed to all property owners within 500' of the project site. The Expanded Initial Study was also made available on the City's website. The original Expanded Initial Study was routed to the State Clearinghouse and seven regulatory agencies on March 20, 2014. One email was received from the local office of the Federal Emergency Management Agency expressing appreciation at being notified of the project. Staff made minor text amendments within the Initial Study at the direction of the Planning Commission, and the Revised Initial Study has been resent to the State Clearinghouse and the applicable regulatory agencies for additional review with a request for a reduced, 20 -day review period. The Draft Resolution presented for Council consideration reflects all suggested changes by the Planning Commission. At the recommendation of Planning staff a condition of approval was added to reflect the inclusion of conditions of permit approval from the various regulatory agencies prior to construction. FINANCIAL IMPACTS The proposed action does not have any substantive financial impacts. The grant agreement is being processed by the grantee, the Association of Bay Area Governments and the San Francisco Estuary Institute and the grantor, the State Department of Water Resources. The City of Petaluma is the local project sponsor and will receive the grant funds through the ABAG/SFEI grant agreement, expected to be executed by July 2014. Matching funds of $217,000 have been budgeted within the Sonoma County Water Agency (SCWA) Zone 2A budget. A funding agreement for the matching funds is now being prepared by SCWA for review by the City Attorney prior to execution by the City and final authorization by the SCWA Board of Supervisors. ATTACHMENTS 1. Resolution Adopting a Mitigated Negative Declaration and Approving the Capri Creek Flood Reduction and Habitat Enhancement Project, with the incorporation of mitigation measures, located along Sunrise Parkway and Woodside Circle between North McDowell Boulevard and Maria Drive, including Exhibit A Revised Mitigation and Monitoring and Reporting Program 2. Resolution of the City of Petaluma Planning Commission recommending to the City Council approval of the Capri Creek Project and recommending adoption of a Mitigated Negative Declaration for the Project. 3. Planning Commission Report 4. Revised Expanded Initial Study Attachment 1 RESOLUTION ADOPTING A MITIGATED NEGATIVE DECLARATION AND APPROVING THE CAPRI CREEK FLOOD REDUCTION AND HABITAT ENHANCEMENT PROJECT, WITH THE INCORPORATION OF MITIGATION MEASURES, LOCATED ALONG SUNRISE PARKWAY AND WOODSIDE CIRCLE BETWEEN NORTH MCDOWELL BOULEVARD AND MARIA DRIVE WHEREAS, on February 25, 2013 the City Council adopted Resolution No. 2013-017 N.C.S. supporting submittal of a grant application for Proposition 84 funds in the amount of $825,000 through the Bay Area Integrated Regional Water Management Program (BAIRWMP) for the Capri Creek Flood Reduction/Environmental Enhancement Project, and authorizing the City Manager to execute appropriate agreements to accept the grant; and, WHEREAS, in February 2014 the City was notified of the award of the $825,000 grant; and, WHEREAS, the City prepared an Initial Study for the Project consistent with CEQA Guidelines sections 15070 through 15074.1 and determined that a Mitigated Negative Declaration (MND) was required in order to analyze the potential for new or additional significant environmental impacts of the Project; and, WHEREAS, on or before March 20, 2014, the City's Notice of Intent to Adopt a Mitigated Negative Declaration based on the Initial Study, providing for a 30 -day public comment period commencing March 27, 2014 and ending May 5, 2014 and a Notice of Public Hearing to be held on July 24, 2012 before the City of Petaluma Planning Commission, was published and mailed to all property owners within 500 feet of the Project as well as all persons having requested special notice of said proceedings; and, WHEREAS, pursuant to the analysis in the Initial Study, the Project does not have the potential to degrade the quality of 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; and, WHEREAS, pursuant to further analysis in the Initial Study, the Project does not make significant impacts that are individually limited, but cumulatively considerable, nor have environmental effects which may cause substantial adverse effects on human beings, either directly or indirectly; and, WHEREAS, the Project is not located on a site listed on any Hazardous Waste Site List compiled by the State pursuant to Section 65962.5 of the California Government Code; and, WHEREAS, the Planning Commission held a public hearing on April 8, 2014, during which the Commission considered the Project, the Mitigated Negative Declaration, the Initial Study, and supporting documentation referenced in the Initial Study, and received and m considered all written and oral public comments on environmental effects of the Project which were submitted up to and at the time of the public hearing; and, WHEREAS, the Planning Commission completed its review of the Project, the Mitigated Negative Declaration, and a Mitigation Monitoring and Reporting Program and, by the adoption of Resolution 2014 -XX, recommended minor text additions to the Initial Study, recommended rerouting the Revised document to the State Clearinghouse, and further recommending to the City Council adoption of the Mitigated Negative Declaration and the Mitigation Monitoring and Reporting Program and the Project; and, WHEREAS, on May 19, 2014, at a duly noticed public meeting, the Petaluma City Council reviewed the Mitigated Negative Declaration, all supporting documents including but not limited to the Revised Initial Study and proposed amendments and additions, the recommendation of the Planning Commission, staff reports and related materials, and all public comments and evidence presented at or before the meeting; and, WHEREAS, the Revised Initial Study and Mitigated Negative Declaration identify mitigation measures applicable to the Project, as incorporated herein by reference; and, WHEREAS, the Mitigated Negative Declaration reflects the City's independent judgment and analysis of the potential for environmental impacts from the Project; and, WHEREAS, the Mitigated Negative Declaration, Revised Initial Study, and related project and environmental documents are available for review in the City Community Development Department at Petaluma City Hall during normal business hours. The custodian of the documents and other materials which constitute the record of proceedings for the proposed project is the City of Petaluma Community Development Department, 11 English Street, Petaluma, CA 94952, Attention: Heather Hines, Planning Manager. NOW, THEREFORE, BE IT RESOLVED THAT the City Council finds and determines as follows: The foregoing recitals are true and correct and incorporated by reference as findings. 1. Based on its review of the entire record herein, including the MND, the Revised Initial Study, all supporting, referenced and incorporated documents and all comments received and responses and additions thereto, the City Council further finds that there is no substantial evidence that the Project as mitigated and conditioned will have a significant effect on the environment, that the Mitigated Negative Declaration reflects the City's independent judgment and analysis, and that the Mitigated Negative Declaration, Revised Initial Study as amended, and supporting documents provide an adequate description of the impacts of the Project and comply with CEQA, the State CEQA Guidelines and the City of Petaluma Environmental Guidelines. 5 2. The City Council adopts the Mitigation and Monitoring and Reporting Program set forth in Exhibit A hereto and incorporated by reference. All mitigation measures contained therein shall be conditions of approval of the Project. 3. The City Council hereby approves the Capri Creek Flood Reduction/Environmental Enhancement Project. U1 EXHIBIT A CAPRI CREEK FLOOD REDUCTION & HABITAT ENHANCEMENT MITIGATION AND MONITORING AND REPORTING PROGRAM APRIL 2014 (Revised to reflect Planning Commission recommendations 04-08-14) This document has been developed pursuant to the California Environmental Quality Act, Public Resource Code Section 21.081.6 to ensure proper and adequate monitoring or reporting in conjunction with project approval which relies upon a Mitigated Negative Declaration. 7 Review Due Date Staff Dept. Date Completed Initials Air Quality AIR -1: Implementation and monitoring of Best PW&U GP Management Practices, including those for dust control during grading and contouring of the flood terrace shall be ensured by the City on-site project manager and contractor. Specific measures will include, but not be limited to, irrigation by spray to reduce dust, requirement of proper emission control devices on all equipment on site to reduce potential air quality impacts from equipment use. Truck access to the site will be limited to Sunrise Parkway and N. McDowell Boulevard. Mitigations will be monitored and enforced by the City on-site project manager and the contractor. Biological Resources BIO -1: As close to the beginning of construction as PD CoC possible, but not more than 14 days prior to commencement of construction activities, a qualified biologist and/or botanist shall conduct a final pre - activity survey of the construction zone to ensure that no special status wildlife and/or plant species have recently occupied the site. Surveys will also be completed for nesting birds. If any special status species are found, exclusion zones shall be established and maintained until all construction activities are completed. If special status species are found during the preconstruction survey, the biologist and/or botanist should be present immediately prior to construction activities that have the 7 potential to impact identified special status species to identify and protect potentially sensitive resources. 13I0-2: The planting plan to be prepared during the PD CA design phase of the project will utilize, to the extent possible, native species for the riparian corridor restoration. The few large shrubs on the north edge of the swale that could possibly host resting birds will be preserved or replaced with a more appropriate or native species in the direct vicinity. 13I0-3: Comply with conditions of the Streambed PW&U Alteration Agreement for vegetation management within the reserved low flow channel, as well as additional permit conditions beyond those proposed and outlined in this document. Permitting will involve consultation with the State of California Department of Fish and Wildlife, the U.S. Fish and Wildlife Service, as well as U.S. Army Corps of Engineers, the State Regional Water Quality Control Board, and Sonoma County Water Agency. Geology and Soils GEO-1: An Erosion Control Plan will be included in PW&U COC, the Construction Plan set. No specific mitigations CA required, normal construction management will be utilized to ensure no erosion or siltation is created during construction activities. All provisions of the City of Petaluma Grading Ordinance the project plans will be followed; finished grades will not be steeper than 2H:1 V. Specific attention shall be included in the Erosion Control Plan to ensure no impact to the low - flow Swale occurs from sediment deposition into the Swale. General grading completed along the floodplain terrace, and not within the swale, will be completed in compliance with conditions of the State Water Resources Control Board General Permit. Mitigation will be monitored and ensured by the on-site City project manager and contractor. GEO-2: Earthwork, including grading, will only occur PW&U, CoC, between the period of June 1 and October 15th. All PD, CA disturbed areas will be stabilized upon final grading and RWQCB protected using a combination of permanent vegetative Requested By or Due Date PW&U Public Works & Utilities GP treatment, mulching, geotextiles, and/or rock, as shown PD Planning Department SPAR Site Plan and Architectural Review RA Regulatory/Referral Agency SCWA: Sonoma County Water Agency RWQCB: Regional Water Quality Control Board DFG: Dept. of Fish & Game in the project Erosion Control Plan (ECP). In addition, Commencement of Construction CA Construction Activity RPI the selected construction Contractor will be required to PCM Post -Construction Monitoring develop a Stormwater Pollution Prevention Plan (SWPPP), subject to City review and approval, and implement the Plan. The City's DPW&U Inspector will monitor and document to insure that the ECP and SWPPPP and other provisions of the approved improvements plans are being followed. Hydrology and Water Quality HYD -l: A detailed Storm Water Pollution Prevention RWQCB, RPI, Plan (SWPPP) shall be prepared and implemented by SCWA, CoC, the Contractor, subject to review and approval of the PW&U CA City of Petaluma. Specific attention shall be included in the Storm Water Pollution Prevention Plan (SWPPP) to ensure no impact occurs from erosion during construction to the low -flow Swale. Mitigation will be monitored and ensured by the on-site City project manager and contractor. HYD -2: The final design of the project shall reduce SCWA, RPI localized base flood elevations and reduce out -of -bank PW&U flow volume and velocity to the extent possible with no adverse impacts downstream. Noise NOISE -l: Construction activity shall be limited to 7 PW&U, CoC AM to 5 PM, Monday through Saturday, non -holidays. PD Department/Ageney Requested By or Due Date PW&U Public Works & Utilities GP Grading Permit PD Planning Department SPAR Site Plan and Architectural Review RA Regulatory/Referral Agency SCWA: Sonoma County Water Agency RWQCB: Regional Water Quality Control Board DFG: Dept. of Fish & Game CoC Commencement of Construction CA Construction Activity RPI Regulatory or Referral Permit Issuance (see RA list) PCM Post -Construction Monitoring CONDITIONS OF PROJECT APPROVAL: 1. Any site and project -specific recommendations and requirements of the regulatory agencies during project review, design, and permit issuance will be deemed to be conditions of approval and be identified as such prior to commencement of construction. 10 Attacluuent 2 RESOLUTION OF THE CITY OF PETALUMA PLANNING COMMISSION RECOMMENDING TO THE CITY COUNCIL APPROVAL OF THE CAPRI CREEK PROJECT AND RECOMMENDING ADOPTION OF A MITIGATED NEGATIVE DECLARATION FOR THE PROJECT WHEREAS, the City Council of the City of Petaluma by Resolution 2013-017 N.C.S., adopted February 25, 2013, endorsed the filing of an application for a grant from the State of California, through the Bay Area Integrated Regional Water Management Program, Proposition 84 Round 2 Funding; and WHEREAS, pursuant to said Resolution the Council further authorized the City Manager to accept the grant and designated the contract manager and fiscal agent; and, WHEREAS, the City has received notification of award of the requested grant in the amount of $825,000; and WHEREAS, the project, located on Sunrise Parkway, east of McDowell Boulevard North, is within the North East subarea of the Petaluma General Plan 2025, adopted by the City on May 19, 2008; and WHEREAS, an Initial Study and Mitigated Negative Declaration (MND) was prepared pursuant to the requirements of the California Environmental Quality Act (CEQA); and WHEREAS, notice of the City's intention to adopt a MND and of the availability of the MND for at least a thirty day public review and continent period was originally given on March 27, 2014 in accordance with CEQA; and WHEREAS, on April 8, 2014, the City of Petaluma Planning Commission conducted a duly noticed public hearing to consider and review the project and MND for recommendation to the City Council. NOW, THEREFORE, BE IT RESOLVED that the Planning Commission hereby: 1. Recommends adoption of the Mitigated Negative Declaration for the project; and 2. Recommends that the Petaluma City Council approve the Capri Creek project. 11 MITIGATIONS TO BE INCLUDED IN THE INITIAL STUDY SUPPORTING THE APPROVAL OF A MITIGATED NEGATIVE DECLARATION — CAPRI CREEK FLOOD REDUCTION AND HABITAT ENHANCEMENT MARCH 2014 I. Aesthetics: No impact, no mitigation or monitoring necessary. II. Agriculture and Forest Resources: No impact, no mitigation or monitoring necessary. III. Air Quality: Implementation and monitoring of Best Management Practices, including those for dust control during grading and contouring of the flood terrace shall be ensured by the City on-site project manager and contractor. Specific measures will include, but not be limited to, irrigation by spray to reduce dust, requirement of proper emission control devices on all equipment on site to reduce potential air quality impacts from equipment use. Truck access to the site will be limited to Sunrise Parkway and N. McDowell Boulevard. Mitigations will be monitored and enforced by the City on-site project manager and the contractor. IV. Biological Resources: A. BIO -1: As close to the beginning of construction as possible, but not more than 14 days prior to commencement of construction activities, a qualified biologist and/or botanist shall conduct a final pre -activity survey of the construction zone to ensure that no special status wildlife and/or plant species have recently occupied the site. Surveys will also be completed for nesting birds. If any special status species are found, exclusion zones shall be established and maintained until all construction activities are completed. If special status species are found during the preconstruction survey, the biologist and/or botanist should be present immediately prior to construction activities that have the potential to impact identified special status species to identify and protect potentially sensitive resources. B. BIO -2: The planting plan to be prepared during the design phase of the project will utilize, to the extent possible, native species for the riparian corridor restoration. The few large shrubs on the north edge of the Swale that could possibly host resting birds will be preserved or replaced with a more appropriate or native species in the direct vicinity. C. BIO -3: Comply with conditions of the Streambed Alteration Agreement for vegetation management within the reserved low flow channel, as well as additional measures imposed as permit conditions beyond those proposed and outlined in this document. Permitting will involve consultation with the State of California Department of Fish and Wildlife, the U.S. Fish and Wildlife Service, as well as U.S. Army Corps of Engineers, 12 the State Regional Water Quality Control Board, and Sonoma County Water Agency. It is likely that further measures will be required as the permit conditions. V. Cultural Resources: No impact, no mitigation or monitoring necessary. VI. Geology and Soils: A. GEO-1: An Erosion Control Plan will be included in the Construction Plan set. No specific mitigations required, normal construction management will be utilized to ensure no erosion or siltation is created during construction activities. All provisions of the City of Petaluma Grading Ordinance, the project plans will be followed; finished grades will not be steeper than 2H:1 V. Specific attention shall be included in the Erosion Control Plan to ensure no impact to the low -flow swale occurs from sediment deposition into the swale. General grading completed along the floodplain terrace, and not within the Swale, will be completed in compliance with conditions of the State Water Resources Control Board General Permit. Mitigation will be monitored and ensured by the on-site City project manager and contractor. B. GEO-2: Earthwork, including grading, will only occur between the period of June I and October 15°1. All disturbed areas will be stabilized upon final grading and protected using a combination of permanent vegetative treatment, mulching, geotextiles, and/or rock, as shown in the project Erosion Control Plan (ECP). In addition, the selected construction Contractor will be required to develop a Stor mwater Pollution Prevention Plan (SWPPP), subject to City review and approval, and implement the Plan. The City's DPW&U Inspector will monitor and document to insure that the ECP and SWPPPP and other provisions of the approved improvements plans are being followed. VII. Greenhouse Gas Emissions: No impact, no mitigation or monitoring necessary. VIII. Hazards and Hazardous Materials: No impact, no mitigation or monitoring necessary. IX. Hydrology and water quality: 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 a line item in the construction agreement. Specific attention shall be included in the Storm Water Pollution Prevention Plan (SWPPP) to ensure no impact to the low -flow swale occurs from erosion during construction into the swale. Mitigation will be monitored and ensured by the on-site City project manager and contractor. HYD -2: It is the intent of the project to reduce localized base flood elevations and reduce out -of -bank flow volume and velocity to the extent possible with no adverse impacts downstream. The final design of the project shall reflect this intent. 13 X. Land Use and Planning: No impact, no mitigation or monitoring necessary. XI. Mineral Resources: No impact, no mitigation or monitoring necessary. XII. Noise: Construction activity shall be limited to 7 AM to 5 PM, Monday through Saturday, non -holidays. XIII. Population and Housing: No impact, no mitigation or monitoring necessary. XIV. Public Services: No impact, no mitigation or monitoring necessary. XV. Recreation: This is a beneficial impact, no mitigation or monitoring necessary. XVI. Transportation/Traffic: No impact, no mitigation or monitoring necessary. XVII. Utilities and Service Systems: No impact, no mitigation or monitoring necessary. XVIII. Mandatory Findings of Significance: Less than significant with mitigation, included herein. 14 Attachment 3 DATE: April 8, 2014 AGENDA ITEM NO: 7 TO: Planning Commission FROM: Dan St. John, Director, Public Works & Utilities SUBJECT: CAPRI CREEK FLOOD REDUCTION & HABITAT ENHANCEMENT McDowell Blvd. North, Sunrise Parkway, Maria Drive, Woodside Circle Initial Study/Mitigated Negative Declaration RECOMMENDATION I Staff recommends that the Planning Commission adopt a resolution recommending that the City Council approve an Initial Study/ Mitigated Negative Declaration for the Capri Creek Flood Reduction and Habitat Enhancement Project and approve the project with the incorporation of mitigation measures. PROJECT SUMMARY I Project: Capri Creels Flood Reduction & Habitat Enhancement McDowell Boulevard North A.P.N.s 137-061-028,149-260-070, and 149-250-074 Project Manager: Pamela Tuft, Project Manager Project Applicant: City of Petaluma, Public Works & Utilities Department Nearest Cross Streets: McDowell Boulevard North at Sunrise Parkway Property Size: 5 acres Site Characteristics: The site is vacant with a straight engineered channel with invasive species growth. The majority of the site is disturbed grassland, largely devoid of trees or shrubs. The northern bank, adjacent to Woodside Circle, is lined with ornamental trees and low shrubs. _ Existing Use: Passive park, community garden (adjacent to Sunrise Parkway). 15 Proposed Use: Recontoured creek channel, open space, flood terrace, riparian habitat, passive park, community garden. Current Zoning: Open Space, Park. Current General Plan Land Use: Public/Semi-Public, City Park PROJECT DESCRIPTION BACKGROUND At the direction of the City Council the Department of Public Works & Utilities has been pursuing implementation of local flood reduction projects, in conjunction with riparian corridor enhancement, since the 1996 adoption of the Petaluma River Access and Enhancement Plan (River Plan) and the 2008 adoption of the General Plan 2025, which readopted the River Plan. The proposed project site has been identified as subject to periodic out -of -bank flooding during both lower and higher intensity storm events. Surface water exceeds the capacity of the creek channel at the downstream end near McDowell Boulevard North and enters Sunrise Parkway. It then flows across McDowell Boulevard North and enters the Capri Villa Mobilehome Park. The City owns all three parcels containing this project. The project site is surrounded by public streets. DESCRIPTION The project proposes to: 1) Increase hydraulic capacity within the channelized creek section between North McDowell Boulevard and Maria Drive (see location map, Exhibit 1, and photo, Exhibit 2, looking downstream from Maria Drive). Project purpose is to achieve the highest possible reduction of out -of -bank flooding during a 100 -year storm event through the creation of a mid -line flood terrace; 2) Create sediment and debris removal basin just upstream of N. McDowell Boulevard to facilitate routine maintenance and emergency flood response to debris blockages; 3) Revegetation and Habitat Enhancement is proposed to follow grading activities for the flood terrace, including placement of trees and native shrubs along the south bank of the newly recontoured creek section. This growth will facilitate shading of the low flow and flood terrace and provide habitat for birds, riparian mammals and other species; and 4) Stewardship through education and outreach into neighboring residential areas. The proposed project will provide flood impact reduction, water quality improvements, and aquatic and terrestrial habitat benefits. Components of the flood terrace excavation will include creation and or restoration of riparian habitat buffer zones, possible seasonal wetlands, and Capri Creek Flood Reduction and Habitat Enhancement 2 16 shallow surface water filtering swales (bioswales). Native plant species endemic to the area will be planted and maintained to improve existing habitat conditions. This project is a small low -impact project seen as integral to a long-term flood reduction and riparian corridor restoration strategy within the Petaluma Watershed. STAFF ANALYSIS GENERAL PLAN 2025 The properties within the project area are designated as Public/Semi Public and City Park by the General Plan 2025 Land Use Map. Capri Creek is located primarily within the North East Subarea (Figure 2-1, General Plan 2025, pages 2-7) The project is consistent with the following goals, policies, and programs: 2-P-95 Preserve, improve and increase the inventory of and access to existing open space resources and schools. 2-P-102 Encourage neighborhood adoption and participation in the restoration of natural habitats (e.g. creeks and urban separator). 4-P-1 G Expand the planting and retention of trees along the upper banks of the river and creeks to reduce ambient water temperature and shade out invasive, non-native species. L Continue to implement, where appropriate, flood terrace improvements to reduce localized flooding in concert with habitat enhancement projects. 4-P-6 Improve air quality through required planting of trees along streets and within park and urban separators, and retaining tree and plant resources along the river and creek corridors. 8-P-31 In accordance with the studies undertaken for the Corps Flood Protection Project, existing areas subject to periodic surface water inundation and containment, within the Corona and Denman Reaches (Lynch Creek confluence with the Petaluma River upstream to the Old Redwood Highway overcrossing of Willow Brook Creek), shall be preserved and enhanced where feasible to reduce localized flooding. [note: Capri Creekfloirs to the Carona Reach of the Petaluma Riveij 8-P-35 Protect private and public properties and capital investments including those designed to minimize flooding potential. Capri Creek Flood Reduction and Habitat Enhancement 3 17 D Promote public education and stewardship of the riparian corridors. SURROUNDING LAND USES Residential neighborhoods surround the project site. Sunrise Park is adjacent to the Capri Creek corridor the entire length of the project. The proposed project is consistent with the existing and future continued passive use of the open space and park. The project will not alter or interfere with the existing community garden on Sunrise Parkway. A CEQA Initial Study and Mitigated Negative Declaration (IS/MND) has been prepared consistent with CEQA guidelines and was made available for public comment, including all applicable regulatory and referral agencies, in March 2014. Public Notice of the document's availability was published in the Argus Courier on March 27, 2014, and distributed to the State Clearinghouse and all appropriate referral agencies the week before the publication date as well as provided to all property owners within a 500 foot radius of the project site. The IS/MND has not identified any significant and unavoidable impacts as a result of the proposed project and therefore has not resulted in the preparation of an Environmental Impact Report (EIR). All project impacts are able to be mitigated to a level of less than significance. Neither the City Environmental Review Guidelines nor CEQA guidelines require that a MND will have Planning Commission hearings when the associated project is at the discretion of the City Council. However, staff has referred the MND for the Capri Creek project to the Planning Commission for their input and recommendation to the City Council. ATTACHMENTS Attachment 1: Draft Resolution of the City of Petaluma Planning Commission recommending to the City Council approval of the Capri Creek project and recommending adoption of a Mitigated Negative Declaration for the Project. Attachment 2: Recommended Mitigations. Initial Study / Proposed Mitigated Negative Declaration, March 2014 (separate document). Capri Creek Flood Reduction and Habitat Enhancement 4 E ATTACHMENT I RESOLUTION OF THE CITY OF PETALUMA PLANNING COMMISSION RECOMMENDING TO THE CITY COUNCIL APPROVAL OF THE CAPRI CREEK PROJECT AND RECOMMENDING ADOPTION OF A MITIGATED NEGATIVE DECLARATION FOR THE PROJECT WHEREAS, the City Council of the City of Petaluma by Resolution 2013-017 N.C.S., adopted February 25, 2013, endorsed the filing of an application for a grant from the State of California, through the Bay Area Integrated Regional Water Management Program, Proposition 84 Round 2 Funding; and WHEREAS, pursuant to said Resolution the Council further authorized the City Manager to accept the grant and designated the contract manager and fiscal agent; and, WHEREAS, the City has received notification of award of the requested grant in the amount of $825,000; and WHEREAS, the project, located on Sunrise Parkway, east of McDowell Boulevard North, is within the North East subarea of the Petaluma General Plan 2025, adopted by the City on May 19, 2008; and WHEREAS, an Initial Study and Mitigated Negative Declaration (MND) was prepared pursuant to the requirements of the California Environmental Quality Act (CEQA); and WHEREAS, notice of the City's intention to adopt a MND and of the availability of the MND for at least a thirty day public review and comment period was originally given on March 27, 2014 in accordance with CEQA; and WHEREAS, on April 8, 2014, the City of Petaluma Planning Commission conducted a duly noticed public hearing to consider and review the project and MND for recommendation to the City Council. NOW, THEREFORE, BE IT RESOLVED that the Planning Commission hereby: 1. Recommends adoption of the Mitigated Negative Declaration for the project; and 2. Recommends that the Petaluma City Council approve the Capri Creek project. Capri Creek Flood Reduction and Habitat Enhancement 5 19 ATTACHMENT 2 MITIGATIONS TO BE INCLUDED IN THE INITIAL STUDY SUPPORTING THE APPROVAL OF A MITIGATED NEGATIVE DECLARATION — CAPRI CREEK FLOOD REDUCTION AND HABITAT ENHANCEMENT MARCH 2014 L Aesthetics: No impact, no mitigation or monitoring necessary. II. Agriculture and Forest Resources: No impact, no mitigation or monitoring necessary. III. Air Quality: Implementation and monitoring of Best Management Practices, including those for dust control during grading and contouring of the flood terrace shall be ensured by the City on-site project manager and contractor. IV. Biological Resources: A. BIO -1: As close to the beginning of construction as possible, but not more than 14 days prior to commencement of construction activities, a qualified biologist and/or botanist shall conduct a final pre -activity survey of the construction zone to ensure that no special status wildlife and/or plant species have recently occupied the site. Surveys will also be completed for nesting birds. If any special status species are found, exclusion zones shall be established and maintained until all construction activities are completed. If special status species are found during the preconstruction survey, the biologist and/or botanist should be present immediately prior to construction activities that have the potential to impact identified special status species to identify and protect potentially sensitive resources. B. BIO -2: The planting plan to be prepared during the design phase of the project will utilize, to the extent possible, native species for the riparian corridor restoration. C. BIO -3: Comply with conditions of the Streambed Alteration Agreement for vegetation management within the reserved low flow channel, as well as additional measures imposed as permit conditions beyond those proposed and outlined in this document. Permitting will involve consultation with the State of California Department of Fish and Wildlife, the U.S. Fish and Wildlife Service, as well as U.S. Army Corps of Engineers, the State Regional Water Quality Control Board, and Sonoma County Water Agency. It is likely that further measures will be required as the permit conditions. 20 V. Cultural Resources: No impact, no mitigation or monitoring necessary. VI. Geology and Soils: A. GEO-1: An Erosion Control Plan will be included in the Construction Plan set. No specific mitigations required, normal construction management will be utilized to ensure no erosion or siltation is created during construction activities. All provisions of the City of Petaluma Grading Ordinance, the project plans will be followed; finished grades will not be steeper than 2H:1 V B. GEO-2: Earthwork, including grading will only occur between the period of June 1 and October 150i. All disturbed areas will be stabilized upon final grading and protected using a combination of permanent vegetative treatment, mulching, geotextiles, and/or rock, as shown in the project Erosion Control Plan (ECP). In addition, the selected construction Contractor will be required to develop a Stormwater Pollution Prevention Plan (SWPPP), subject to City review and approval, and implement the Plan. The City's DPW&U Inspector will monitor and document to insure that the ECP and SWPPPP and other provisions of the approved improvements plans are being followed. VII. Greenhouse Gas Emissions: No impact, no mitigation or monitoring necessary. VIII. Hazards and Hazardous Materials: No impact, no mitigation or monitoring necessary. IX. Hydrology and water quality: 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 a line item in the construction agreement. X. Land Use and Planning: No impact, no mitigation or monitoring necessary. XI. Mineral Resources: No impact, no mitigation or monitoring necessary. XII. Noise: Construction activity shall be limited to 7 AM to 5 PM, Monday through Saturday, non -holidays. XIII. Population and Housing: No impact, no mitigation or monitoring necessary. XIV. Public Services: No impact, no mitigation or monitoring necessary. XV. Recreation: This is a beneficial impact, no mitigation or monitoring necessary. XVI. Transportation/Traffic: No impact, no mitigation or monitoring necessary. Capri Creels Flood Reduction and Habitat Enhancement 7 21 XVII. Utilities and Service Systems: No impact, no mitigation or monitoring necessary. XVIII. Mandatory Findings of Significance: Less than significant with mitigation, included herein. Capri Creek Flood Reduction and Habitat Enhancement 8 22 Attachment 4 CITY OF PETALUMA PUBLIC WORKS AND UTILITIES DEPARTMENT CEQA Environmental Checklist - Expanded Initial Study :ed by underlining of added text, StFi��ike oat of deleted text, and/or highlighting two amended boxes] PROJECT DESCRIPTION AND BACKGROUND Project Title: —Capri Creek Flood Reduction and Habitat Restoration Lead agency name and address: City of Petaluma, Dept. of Public Works & Utilities 202 North McDowell Boulevard, Petaluma, CA 94954 Contact person and phone: Pam Tuft, City of Petaluma, Dept. of Public Works & Utilities, 707 778-4546 Project Location: Capri Creels, between North McDowell Boulevard and Maria Drive Project sponsor's name and address: City of Petaluma, Department of Public Works & Utilities 202 North McDowell Boulevard, Petaluma, CA 94954 General Plan description: Public/Semi-Public, City Park Zoning: Open Space - Park Description of project: (Describe the whole The City of Petaluma proposes a multi -benefit project in the Capri Creek sub -basin of the Petaluma watershed The main component of action involved, including but not limited to later phases of the project, and any secondary, support, or off-site features necessary for its implementation.) work is the creation of a flood terrace alone the southern edge of the low flow channel by excavating approximately 10,000 cubic yards of fill. The excavation work will also include creation and/or restoration of riparian habitat buffer zones, seasonal wetlands. shallow surface water filtering swales (bioswales)and a sediment/debris removal basin at the west end of the project. The project includes four components, which further define the work to be undertaken: 1) Increase hydraulic capacity within channelized creek section between North McDowell Boulevard and Maria Drive (see location map, Exhibit 1, and photo, Exhibit 2, looking downstream from Maria Drive). Project purpose is to achieve the highest possible reduction of out -of -bank flooding during a 100 - year storm event through the creation of a mid -line flood terrace. 2) Create sediment and debris removal basin just upstream of N. McDowell Boulevard to facilitate routine maintenance and emergency flood response to debris blockages. 3) Revegetation and Habitat Enhancement is expected to follow grading activities for the flood terrace, including placement of trees and native shrubs along the south bank of the newly recontoured creek section. This growth will facilitate shading of the low flow and flood terrace and provide habitat for birds and riparian mammals and other species. 4) Stewardship through education and outreach into neighboring residential areas, supported by two `clean-up' days per year. Surrounding land uses and setting; briefly describe the project's surroundings: Residential neighborhoods surround Sunrise Park, which lies adjacent to the creek corridor along the south bank of Capri Creek. Woodside Circle lies directly adjacent to the project site along the north bank. Existing creek channel is primarily a graded engineered Swale. 23 Other public agencies California Department of Fish and Game (1602 Streambed whose approval is Alteration Agreement), Regional Water Quality Control Board required permits, financial approval, or (401 Water Quality Certification), the California Department app participation agreements): of Water Resources (as project grant funding agency), the United States Army Corps of Engineers, potential (Section 401) Nationwide Permit, Sonoma County Water Agency Funding Agreement through the Sonoma County Board of ENVIRONMENTAL FACTORS POTENTIALLY AFFECTED: The environmental factors checked below would be potentially affected by this project. Please see the rherklist heninninn nn none 3 fnr aririitinnal infnrmatinn E] Aesthetics ❑ Agriculture and Forestry X Air Quality ❑X Biological Resources ❑ Cultural Resources 0 Geology/Soils ❑ Greenhouse Gas Emissions E] Hazards and Hazardous Materials Q Hydrologymater Quality Land Use/Planning ❑ Mineral Resources Noise ❑ Population/Housing Public Services © Recreation Transportationfl-raffic E] Utilities/Service Systems Mandatory Findings of Si nificance DETERMINATION: On thehasis of this initial evnhiatinn- r] I find that the proposed project COULD NOT have a significant effect on the environment, and a NEGATIVE DECLARATION will be prepared. Q I find that although the proposed project could have a significanteffect 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 will be prepared. 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 {nposad upon the proposed project, nothing further is reqWred,/ Signature: / ` / Date:el /y — Printed Name: Dan St. John, F. SCE, Director, DPW&U Page 2 of 18 24 CEQA — Revised Expanded Initial Study Project: CAPRI CREEK CEQA Environmental Checklist April 2014 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. Where 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. Discussion: The creek corridor is not located within a designated scenic vista, or is it located within a state scenic highway. The existing visual quality of the creek corridor is poor with a straight engineered channel with invasive species growth (see photo exhibits). The majority of the site is disturbed grassland, largely devoid of trees or shrubs. The northern bank, adjacent to Woodside Circle, is lined with ornamental trees and low shrubs. The proposed flood terrace and modification of the channel toward the southern bank will allow meandering and pooling of low flows, provision of small scale rock outcroppings, with placement of trees for shading of the waterway. The project will significantly improve the aesthetics of the site for surrounding residents and park users. The project goal of restoration and enhancement will result in an improved riparian corridor. No new light or glare sources are proposed. Mitigation Measures/Monitoring: No adverse impact, no mitigation or monitoring necessary It. AGRICULTURE AND FOREST RESOURCES: In determining whether impacts to agricultural resources are significant environmental effects, lead agencies may refer to the 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 delermining 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: 25 Potentially Less Than Less Than No Significant Significant Significant Impact Impact with Impact Mitigation I. AESTHETICS: Would the project: a) Have a substantial adverse effect on a scenic vista El ❑ ❑ 11 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 El ❑ El z adversely affect day or nighttime views in the area? Discussion: The creek corridor is not located within a designated scenic vista, or is it located within a state scenic highway. The existing visual quality of the creek corridor is poor with a straight engineered channel with invasive species growth (see photo exhibits). The majority of the site is disturbed grassland, largely devoid of trees or shrubs. The northern bank, adjacent to Woodside Circle, is lined with ornamental trees and low shrubs. The proposed flood terrace and modification of the channel toward the southern bank will allow meandering and pooling of low flows, provision of small scale rock outcroppings, with placement of trees for shading of the waterway. The project will significantly improve the aesthetics of the site for surrounding residents and park users. The project goal of restoration and enhancement will result in an improved riparian corridor. No new light or glare sources are proposed. Mitigation Measures/Monitoring: No adverse impact, no mitigation or monitoring necessary It. AGRICULTURE AND FOREST RESOURCES: In determining whether impacts to agricultural resources are significant environmental effects, lead agencies may refer to the 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 delermining 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: 25 CEQA — Expanded Initial Study April 2014 Project: CAPRI CREEK Potentially Less Than Less Than No Significant Significant Significant Impact Impact with Impact Mitigation a) Convert Prime Farmland, Unique Farmland, or Farmland of El E] 1:1Statewide 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? b) Conflict with existing zoning for agricultural use, or a El E] E]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))? El E] Elquality d) Result in the loss of forest land or conversion of forest land ❑ 1:1 E]to non -forest use? ❑ F-1 ❑ e) Involve other changes in the existing environment which, due E] E] 1:1to their location or nature, could result in conversion of El El Elcriteria Farmland, to non-agricultural use or conversion of forest land to non -forest use? Discussion: Not applicable, the site is not proximate to any land designated for farmland. The recent creation of an urban community garden within the Sunrise Park was designed and implemented to work in concert with the proposed flood terrace and enhancement project. Mitigation Measures/Monitoring: No adverse impact, no mitigation or monitoring necessary. III. AIR QUALITY: Where available, the significance criteria El 1:1 1:1established by the applicable air quality management or air pollution control district may be relied upon to make the following determinations. Would the project: a) Conflict with or obstruct implementation of the applicable air El E] Elquality plan? b) Violate any air quality standard or contribute substantially to ❑ F-1 ❑ an existing or projected air quality violation? c) Result in a cumulatively considerable net Increase of any El El Elcriteria 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 Elpeople? Page 4 of 18 ❑ ❑ 26 CEQA — Expanded Initial Study Project: CAPRI CREEK Discussion: April 2014 Potentially Less Than Less Than No Significant Significant Significant Impact Impact with Impact Mitigation designated streets. The use of Best Management Practices during construction activities will ensure no significant adverse temporary air quality impacts are experienced by neighboring property residents. Mitigation Measures/Monitoring: AIR -1: Implementation and monitoring of Best Management Practices, including those for dust control during grading and contouring of the flood terrace shall be ensured by the City on-site project manager and contractor. Specific measures will include, but not be limited to irrigation IV. BIOLOGICAL RESOURCES: Would the project: a) Have a substantial adverse effect, either directly or through ❑ El El ❑X 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 California Department of Fish and Wildlife or U.S. Fish and Wildlife Service? b) Have a substantial adverse effect on any riparian habitat or other sensitive natural community identified in local or regional 0 El 21 El plans, policies, and regulations or by the California Department - of Fish and Wildlife or US Fish and Wildlife Service? 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 F] ❑ n 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 plan? Page 5 of 18 27 CEQA — Expanded Initial Study Project: CAPRI CREEK Discussion: ,^, ^nd-d)- April 2014 Potentially Less Than Less Than No Significant Significant Significant Impact Impact with Impact Mitigation project site consists of ruderal and disturbed grassland containing primarily Canary grass (Phalaris canadensis), cattails (Typha), and crabgrass (Digitaria) on the existing channelized bank. The existing low flow channel will be preserved with removal and/or limbing up of invasive exotic vegetation including Salix lasiolepis (arroyo willow), Alisma plantago-aquatica (common water -plantain), Polygonum, and Helminthotheca echioides, bristly ox -tongue, Bull thistle Cirsium vulgare, and Coyote Brush Baccharis pilularis. No known special status species inhabit the site. The project would modify habitat since it includes removal and clearing of invasive exotic vegetation, to enhance flood capacity and conveyance within the modified flow channel and terrace area and allow restoration of a more natural riparian corridor. Only selective clearing and cutting would be allowed of any nativeto ant species found on site. Restoration planting will include use of native species, and will provide improved conditions for any future wildlife species within the corridor. Although no impacts are expected through the implementation of this enhancement project, because the site is within a riparian corridor, mitigation measures are proposed to ensure that no species inhabit the site just prior to construction and to ensure compliance with all regulatory agency suggestions and permit requirements. Mitigation Measures/Monitoring: BIO -1: As close to the beginning of construction as possible, but not more than 14 days prior to commencement of construction activities, a qualified biologist and/or botanist shall conduct a final pre -activity survey of the construction zone to ensure that no special status wildlife and/or plant species have recently occupied the site. Surveys will also be completed for nesting birds. If any special status species are found, exclusion zones shall be established and maintained until all construction activities are completed. If special status species are found during the preconstruction survey, the biologist and/or botanist should be present immediately prior to construction activities that have the potential to impact identified special status species to identify and protect potentially sensitive resources. BIO -2: The planting plan to be prepared during the design phase of the project will utilize, to the extent possible, native species for the riparian corridor restoration. The few large shrubs on the BIO -3: Comply with conditions of the Streambed Alteration Agreement for vegetation management within the reserved low flow channel, as well as additional measures impased-as permit conditions beyond those proposed and outlined in this document. Permitting will involve consultation with the State of California Department of Fish and Wildlife, the U.S. Fish and Wildlife Service, as well as U.S. Army Corps of Engineers, the State Regional Water Quality Control Board, and Sonoma County Water Agency. k-is-likety-that-further-measures-will-be requireda s4he-permiEsondiNans: Page 6 of 18 28 CEQA — Expanded Initial Study Project: CAPRI CREEK V. CULTURAL RESOURCES: Would the project: April 2014 Potentially Less Than Less Than No Significant Significant Significant Impact Impact with Impact Mitigation a) Cause a substantial adverse change in the significance of a ❑ El F1 X❑ historical resource as defined in §15064.5? b) Cause a substantial adverse change in the significance of an El 0 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 formal cemeteries? El 1:1 0 Discussion: Prior to urban development activities in the 1970's, the site was dry farmed for hay crops. An old farm residence is located on the parcel to the west of the project site; however, it was moved to this location in the early 1990's from Corona Road; therefore no historic resources are expected in the vicinity of the relocated structure. There are no known historical resources or activities of significance on the project site. Mitigation MeasureslMonitoring: No impact, no mitigation or monitoring necessary VI. GEOLOGY AND SOILS: Would the project: a) Expose people or structures to potential substantial adverse El M 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? it) Strong seismic ground shaking? El 1:1 0 iii) Seismic -related ground failure, including liquefaction? El ❑ ❑ El iv) Landslides? ❑ ❑ ❑X b) Result in substantial soil erosion or the loss of topsoil? E] ® ❑ El 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 El N septic tanks or alternative waste water disposal systems where sewers are not available for the disposal of waste water? Page 7 of 18 29 CEQA — Expanded Initial Study Project., CAPRI CREEK April 2014 Potentially Less Than Less Than No Significant Significant Significant Impact Impact with Impact Mitigation kept in place during all construction phases. la) The City's proposed project has as its primary intent, the establishment of a flood terrace to improve flow conveyance within the Capri Creek corridor and reduce localized flooding impacts, while at the same time enhancing terrestrial and seasonal aquatic habitat. The project requires site grading which will result in disruption to soils and a substantive change in topography. Preliminary design work, authorized by City Council, was done in conjunction with an application for grant funds authi zetea-by City Geuneig; work will commence upon completion of the environmental review process and award of the engineering and design contract. traplementn:iPR great. It is intended that the cut materials will either be off -hauled to an appropriate site or utilized for the top of bank stabilization and berming. Implicit in the project's design are features to prevent negative impacts to the area such as the creation of unstable bank conditions, erosion of banks and soils, or siltation to adjacent or downstream areas. The-prejest ineludeS sa primary-inteat-te-impreve flood -conveyance -sapasiEy Feduse4he-frequency-and-depth-of-aut of bank-fleediagalengthe-Greel—.The project will also include habitat enhancement by removing invasive non-native species, and by planting native species along the newly recontoured southern bank. Soil disturbance, as part of the terracing and exotic vegetation removal, will be completed under conditions of the Streambed Alteration Agreement with the California Department of Fish and Wildlife (formerly Fish and Game) with erosion control measures and scheduling during dry or non -flow conditions, when rainfall is highly unlikely. General grading completed for the floodplain terrace and within the dry channel will be completed in compliance with conditions of the State Water Resources Control Board General Permit. Mitigation Measures/Monitoring: V'4v(b �an-signiflGaat. GEO-1: An Erosion Control Plan will be included in the Construction Plan set. No specific mitigations required, normal construction management will be utilized to ensure no erosion or siltation is created during construction activities. All provisions of the City of Petaluma Grading Ordinance, the project plans will be followed; finished grades will not be steeper than 2H:1 V. the State Water Resources Control Board General Permit. Mitigation will be monitored and ensured by the on-site City proiect manager and contractor. GEO-2: Earthwork, including grading will only occur between the period of June 1 and October 151n. All disturbed areas will be stabilized upon final grading and protected using a combination of permanent vegetative treatment, mulching, geotextiles, and/or rock, as shown in the project Erosion Control Plan (ECP). In addition, the selected construction Contractor will be required to develop a Stormwater Pollution Prevention Plan (SWPPP), subject to City review and approval, and implement the Plan. The City's DPW&U Inspector will monitor and document to insure that the ECP and SWPPPP and other provisions of the approved improvements plans are being followed. Page 8 of 18 a CEQA — Expanded Initial Study April 2014 Project: CAPRI CREEK Potentially Less Than Less Than No mile of an existing or proposed school? Significant Significant Significant Impact d) Be located on a site which is included on a list of hazardous Impact with Impact M materials sites compiled pursuant to Government Code Section Mitigation VII. GREENHOUSE GAS EMISSIONS: Would the project: a) Generate greenhouse gas emissions, either directly or ' indirectly, that may have a significant impact on the El 11 environment? b) Conflict with an applicable plan, policy or regulation adopted for the purpose of reducing the emissions of greenhouse gases? Discussion: All applicable goals, policies and programs within the City General Plan 2025 pertaining to the reduction of the contribution to greenhouse gases shall be applicable to this project. Mitigation Measures/Monitoring: No impact, no mitigation or monitoring necessary. Vlll. HAZARDS AND HAZARDOUS MATERIALS: Would the project: a) Create a significant hazard to the public or the environment through the routine transport, use, or disposal of hazardous 1:1 El El FZ materials? b) Create a significant hazard to the public or the environment through reasonably foreseeable upset and accident conditions El El El Z involving the release of hazardous materials Into the environment? c) Emit hazardous emissions or handle hazardous or acutely hazardous materials, substances, or waste within one-quarter mile of an existing or proposed school? d) Be located on a site which is included on a list of hazardous El El El M 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 El 11 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? 0 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 El El El El adopted emergency response plan or emergency evacuation plan? h) Expose people or structures to a significant risk of loss, injuryM or death involving wildland fires, Including where wildlands are adjacent to urbanized areas or where residences are intermixed with wildlands? Page 9 of 16 31 CEQA — Expanded Initial Study April 2014 Project: CAPRI CREEK Potentially Less Than Less Than No Significant Significant Significant Impact Impact with Impact Mitigation Discussion: The Droiect site is not located on a known hazardous materials site or within an wildland fires. Prior activity on the site was dry hay farming, no storage of materials, hazardous or otherwise, has occurred on this site. The proposed improvements to the riparian corridor are in keeping with an urban creek corridor rather than protected wildland habitat. Tall and low canopy planting will be prioritized to ensure clear observation of the public corridor. Mitigation Measures/Monitoring: No impact, no mitigation or monitoring necessary IX. HYDROLOGY AND WATER QUALITY: Would the project: a) Violate any water quality standards or waste discharge EJ 0 El N requirements? El El or river, or substantially Increase the rale or amount of surface M b) Substantially deplete groundwater supplies or interfere mnoff in a manner which would result in flooding on- or off-site? substantially with groundwater recharge such that there would e) Create or contribute runoff water which would exceed the be a net deficit in aquifer volume or a lowering of the local FJ El El provide substantial additional sources of polluted runoff? groundwater table level (e.g., the production rate of pre-existing nearby wells would drop to a level which would not support El E existing land uses or planned uses for which permits have been granted)? c) Substantially alter the existing drainage pattern of the site or El 0 El El 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? d) Substantially alter the existing drainage pattern of the site or El El 0 El area, including through the alteration of the course of a stream g) Place housing within a 100 -year flood hazard area as El El or river, or substantially Increase the rale or amount of surface M mapped on a federal Flood Hazard Boundary or Flood mnoff in a manner which would result in flooding on- or off-site? Insurance Rate Map or other flood hazard delineation map? e) Create or contribute runoff water which would exceed the capacity of existing or planned slormwaler drainage systems or FJ El El provide substantial additional sources of polluted runoff? would impede or redirect flood flows? f) Otherwise substantially degrade water quality? El F-1 0 M g) Place housing within a 100 -year flood hazard area as El El 0 M 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 FJ El El would impede or redirect flood flows? i) Expose people or structures to a significant risk of loss, injury El E or death involving flooding, including flooding as a result of the failure of a levee or dam? j) Inundation by seiche, tsunami, or mudflow ❑ El 0 ❑X Page 10 of 18 CEQA — Expanded Initial Study April 2014 Project: CAPRI CREEK Potentially Less Than Less Than No Significant Significant Significant Impact Impact with Impact Mitigation Discussion: The establishment of a flood terrace will alter the existing hydrology and drainage patterns of the City's Capri Creek project site. However, the project's-jntent is designed to improve surface water conveyance and reduce localized out -of -bank flooding within the project area and its immediate surrounds including the residential neighborhoods along Sunrise Parkway, Woodside Circle, and across North McDowell Boulevard downstream of the project sire. Analysis of the potential reduction to surface water elevations during storm events was evaluated by the completion of analysis through the City's Surface Water Management Model (XP-SWMM) prepared by WEST Consultants and attached hereto by reference. Construction related soil erosion would be mitigated through implementation of erosion and sediment control measures and other BMP's discussed below under HYD -1. Mitigation Measures/Monitoring: 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 a line item in the construction agreement. Soecific attention shall be included in the Storm Water HYD -2: The final design of the project shall reduce localized base flood elevations and reduce out -of -bank flow volume and velocity to the extent possible with no adverse impacts downstream X. LAND USE AND PLANNING: Would the project: a) Physically divide an established community? E] b)Conflict with any applicable land use plan, policy, or regulation El E] 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 El El E] natural community conservation plan? Discussion: The creek corridor is bounded by parkland on the south and public streets to the east, west, north, and beyond the parkland to the south. The project site is surrounded by residential neighborhoods. The project is consistent with land use and open space policies regarding accessibility of park land and open space within close proximity to residential neighborhoods. The enhanced project will improve the connectivity between neighborhoods and increase public use of the enhanced open space. Mitigation Measures/Monitoring: No impact, no mitigation or monitoring necessary Page 11 of 18 33 CEQA — Expanded Initial Study April 2014 Project: CAPRI CREEK Potentially Less Than Less Than No Significant Significant Significant Impact Impact with Impact Mitigation XI. MINERAL RESOURCES: Would the project: a) Result in the loss of availability of a known mineral resource that would be of value to the region and the residents of the El El H stale? b) Result in the loss of availability of a locally -important mineral resource recovery site delineated on a local general plan, El El El N specific plan or other land use plan? Discussion: Implementation of the proposed project has no adverse impact on mineral resources, known or unknown. Mitigation Measures/Monitoring: No impact, no mitigation or monitoring necessary XII. NOISE: Would the project result in 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 groundborne noise levels? c) A substantial permanent increase in ambient noise levels in the project vicinity above levels existing without the project? d) A substantial temporary or periodic increase in ambient noise Y 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? 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: Temporary construction noise will be experienced during grading and contouring of the flood terrace and planting activities for the enhancement of the riparian corridor. Best Management Practices and limiting construction hours to respect the surrounding neighborhoods will minimize the impact. Duration of grading activity for creation of the flood terrace and contour Mitigation Measures/Monitoring: NOISE -1: Construction activity shall be limited to 7 AM to 5 PM, Monday through Saturday, non - holidays. Page 12 of 18 34 CEQA — Expanded Initial Study Project. CAPRI CREEK XIII. POPULATION AND HOUSING: Would the project: April 2014 Potentially Less Than Less Than No 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) El 1:1 El OF indirectly (for example, through extension of roads or other infrastructure) b) Displace substantial numbers of existing housing, ful necessitating the construction of replacement housing El El El LILIJ elsewhere? c) Displace substantial numbers of people, necessitating the construction of replacement housing elsewhere? 0 El El E Discussion: The proposed unit adds no housing nor does it displace any existing housing. Mitigation MeasureslMonitoring: No impact, no mitigation or monitoring necessary. XIV. PUBLIC SERVICES: a) Would the project result in substantial adverse physical impacts associated with the provision of new or physically El El 0 altered governmental facilities, need for new or physically altered governmental facilities, the construction of which could 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? ❑ El X❑ Police protection? El ❑ ❑ Schools? El El F FX Parks? ❑ 0 ❑ Other public facilities? El ❑ F Discussion: The project site is currently passive use open space with a degraded riparian corridor. The proposed project will remain passive use open space with a much improved riparian corridor. No adverse impact is anticipated to any of the above listed public services. Improved stewardship by surrounding neighborhoods is expected to occur with the enhanced environment. Mitigation Measures/Monitoring: No adverse impact, no mitigation or monitoring necessary XV. RECREATION: a) Would the project increase the use of existing neighborhood and regional parks or other recreational facilities such that substantial physical deterioration of the facility would occur or be accelerated? Page 13 of 18 35 CEQA — Expanded Initial Study El El El April 2014 Project: CAPRI CREEK Potentially Less Than Less Than No demand measures, or other standards established by the county Significant Significant Significant Impact congestion management agency for designated roads or Impact with Impact highways? Mitigation b) Does the project include recreational facilities or require the �. O construction or expansion of recreational facilities which might have an adverse physical effect on the environment? Discussion: The improved passive use open space will have a beneficial physical effect on the environment and the enjoyment of the public lands by surrounding residents. Increased pedestrian and bicycle use of the existing trail will be compatible with the improvements and encourage ownership and stewardship of the corridor. Mitigation Measures/Monitoring: No impact, no mitigation or monitoring necessary. XVI. TRANSPORTATION/TRAFFIC: Would the project: a) Conflict with 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, El El El Z 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 O increase in traffic levels or a change in location which results In substantial safety risks? d) Substantially increase hazards due to a design feature (e.g., El 0 El 0 sharp curves or dangerous intersections) or incompatible uses (e.g., farm equipment)? e) Result in inadequate emergency access? E E] F Q f) Conflict with adopted policies, plans or programs regarding F-1 ❑ O public transit, bicycle, or pedestrian facilities, or otherwise decrease the performance or safety of such facilities? Discussion: The project site is bounded on the west by a major arterial, McDowell Boulevard North, a local connector on the south and east, Sunrise Parkway and Maria Drive, and a local residential street to the north, Woodside Circle. The proposed project does not increase traffic or modifv existing traffic oattems was construction is comolete. Construction traffic will add large features of existing roadways. Mitigation Measures/Monitoring: No impact, no mitigation or monitoring necessary. Page 14 of 18 36 CEQA — Expanded Initial Study April 2014 Project: CAPRI CREEK Potentially Less Than Less Than No Significant Significant Significant Impact Impact with Impact Mitigation XVII. UTILITIES AND SERVICE SYSTEMS: Would the project: a) Exceed wastewater treatment requirements of the applicable the environment, substantially reduce the habitat of a fish or wildlife species, cause a fish or wildlife population to drop below Regional Water Quality Control Board? self-sustaining levels, threaten to eliminate a plant or animal community, substantially reduce the number or restrict the range b) Require or result in the construction of new water or El El H wastewater treatment facilities or expansion of existing facilities, b) Does the project have impacts that are Individually limited, but cumulatively considerable? ("Cumulatively considerable" the construction of which could cause significant environmental when viewed in connection with the effects of past projects, the effects of other current projects, and the effects of probable effects? future projects)? 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 El El El N 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? f) Be served by a landfill with sufficient permitted capacity to El El N accommodate the project's solid waste disposal needs? g) Comply with federal, stale, and local statutes and regulations related to solid waste? Discussion: The proposed project does not include any modifications or expansions of existing utility systems. The existing Swale serves as part of the local drainage system and is proposed significant impacts. Mitigation Measures/Monitoring: No significant impacts, no mitigation or monitoring necessary. XVIII. MANDATORY FINDINGS OF SIGNIFICANCE a) Does the project have the potential to degrade the quality of 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)? Page 15 of 18 37 CEQA — Expanded Initial Study Project: CAPRI CREEK c) Does the project have environmental effects which will cause substantial adverse effects on human beings, either directly or indirectly? Potentially Less Than Significant Significant Impact with Mitigation April 2014 Less Than No Significant Impact Impact Attachments: Exhibit 1: Location Map Exhibit 2: Photo Exhibit 3: Capri Creek Hydraulic Analysis, prepared by WEST Consultants (includes preliminary cross section drawings of flood terrace). References: City of Petaluma General Plan 2025 City of Petaluma River Access and Enhancement Plan - Although the project site is not within the plan boundary of this policv document, the oroiect site flows into the reach of the Petaluma River identified as the Upstream Segment in the Plan. The General Plan 2025 readopted the River Access and Enhancement Plan and connected to the tributary streams with the following text (pg. 8-13): "Preservation and enhancement of the natural channels offers an excellent opportunity to improve the flood conveyance capacity and enhance habitat values. Utilizing and implementing the River Access and Enhancement Plana (1986), setting aside the Petaluma River Corridor, and utilizing the Restoration, Design and Management Guidelines for maintenance activities will ensure the protection of the natural environment while meeting the flood flow capacity needs for the Petaluma Watershed Basin." Flood reduction and riparian enhancement projects utilize both the General Plan and the River Access and Enhancement Plan as reference documents dgfbq project identification and early design work. Agency Contacts: Kenyon Foster, Principal Environmental Specialist, Sonoma County Water Agency Page 16 of 18 NE CEQA — Expanded Initial Study Project: CAPRI CREEK Exhibit 1 — Location Map 39 CEQA—Expanded Initial Study Project: CAPRI CREEK Exhibit 2 — Photo (looking downstream from Maria Drive) 40 Gonsu Iton ts, I nc. MEMORANDUM Project: Capri Creek Terracing XP -Storm Evaluation Q ,oFESSI Nq� Subject: Results Summary Date: February 13, 2013 h z No. C056132 y z To: Pamela Tuft, City of Petaluma {� EXP. 12/31/14 Kent Carothers, City of Petaluma CIVI� tiP qTF From: David S. Smith, P.E., WEST Consultants, Inc. OF C 1 t - This memo summarizes the analysis completed by WEST Consultants, Inc. (WEST) for the City of Petaluma (the City) for the Capri Creek Terracing project, located between McDowell Boulevard and Maria Drive (see Figure 1). The subject of this memo is the hydraulic impact of the proposed terracing. Modeling and floodplain mapping completed by WEST for the recent FEMA map revision reflect flooding downstream of Maria Drive in the right overbank (looking downstream) along Woodside Circle and breakout flows in the left overbank to Sunrise Parkway, Nikki Lane, and the Capri Mobile Villa trailer park. The purpose of the terracing project is to reduce flooding along Capri Creek downstream of Maria Drive. XP -Storm version 2010 (build May 20, 2010) was used in this evaluation. The methods used to evaluate the hydraulic effects of the proposed terracing are described below along with tabular results for the 10 -year, 25 -year, 50 -year, and 100 -year events. 1 of 5 41 EXHIBIT 3 February 13, 2013 i 4' 7 Maria Drive VY QL o v GAJ }LF '/ 40,¢��5. Mqu � • .� � 7 bA�p i s Capri Creels Terracing Culvert Entrance Improvements °y p (Phase 2) p° A o / McDowell Blvd O :. rte, l y fiiRCHi;rOC'J Cj Sy .y QQTCJ � 40 tiro r Figure 1. Capri Creek Terracing and McDowell Boulevard Culvert Entrance Improvements Modeling Approach The City's 10 -year, 50 -year, and 100 -year XP -Storm models that were the basis of the FEMA remapping effort were used for evaluating the proposed improvements (filenames 10yr_9-27-10.xp", "50yr_9-27-10.xp", and 100yr_9- 27-10.xp"). The 25 -year XP -Storm model did not previously exist so WEST imported the 25 -year rainfall data from the FEMA remapping project into the XP - Storm model. This rainfall data was generated during the FEMA remapping project but not specifically used for mapping purposes. Three nodes were added to the existing conditions model in the terracing reach between McDowell Boulevard and Maria Drive: CaC_1050, CaC_1450, and CaC_1950 (see Figure 2). WEST Consultants, Inc. 2 of 5 42 EXHIBIT 3 February 13, 2013 � pa0'r:N C_2350 \ 121,AFRI .IA� aC 2241 RO'NIJ CAPRI G.APR /E3C90t,ISIE / ��' '•h'DODEIDE a 150 R �f/ �\ ,AL OAK CAPRI APRI LORENCE \ ,APRI AFRI C 1 0`(-, OAIC LORE tUNP.ISE 0 SIDE \\\C.^PRI AFRI C 1750 OPAL OAK LOREI,E \ \.ROYALOAK �' \\ ,APRIcaeaD ~ OODSORR!j `F1-L'Eff--I1€ RENCE Idir�\[7 CAPRI 'AFRI C1450 11 'n'OOD SORREL CaC_L70 CAPRI AFRI tlIIRIEE 621250 vERD kiCI'lliCO'ELLL / .Q �L4O03 - b /�rLG1 cRDrO CaC_R92 C L100 V C 1060 ,r `.h'OODSIDE - RFIL um ppgn CHAe htSDOwELL CaC L20 CaC_L10 aC_R51 Ur "L ��(L12D ` \ROW `WALK i. ,. 11L€30 _...._..... _. Cao "10RBD C _L160 �•� CaC L,D2. 4 aC_R20 /RPi L10 DUND AAL F 11 ELL,' ROUIJD'n'A C OWID'f:11�2K R80 Cd o5D041 NRISc. CaC_R30 \ 6.�tAavlii C R52 `c C1-140 IJI v aC R70 \� p C L150 'NUIz ' �L DIUKIa / !`' CaC R72 Ca _L170\ - 4 CaC_R40 i' ID'NALIC C 0350 _ �Td DONELL RPILIO _ rd _ 6666 �� CP R5D CaC_R74 ��,/ �TJ \ C_TP40 6ID INELIPC_R76 0047 \t C R110 »jtjS FL.IdIG C TP30 !' o•" 11O �JOLEn'OOD \ C_TP50 aC_R120 MCoo'6'ELL \\ :i II QOV. ELL Figure 2. Capri Creek XP Model Detail WEST Consultants, Inc. 3 of 5 43 EXHIBIT 3 February 13, 2013 New cross section data was extracted based on the City's 2 -foot contour topography at each node. The following XP -Storm model file names were used in the evaluation of existing conditions: • 10yr_1-25-13.xp (10 -year event) • 25yr_1-25-13.xp (25 -year event) • 50yr_1-25-13.xp (50 -year event) • 100yr_1-25-13.xp (100 -year event) Cross section data for the proposed terracing was provided by the City in Plan 32 of the HEC -RAS model with file name capricreekhec-ras.prj. Six XP -Storm cross sections were edited based on the proposed terracing between model nodes CaC _0850 and CaC 2150. Table 1 provides the HEC -RAS cross section ID that best represents each XP -Storm reach. The existing and proposed condition cross sections are illustrated in Attachment 1. Table 1. HEC -RAS Cross Sections Used in XP -Storm From XP Storm Node Reach To Node HEC -RAS Cross Section ID CaC 0850 CaC 1050 1300 CaC 1050 CaC 1250 1500 CaC 1250 CaC 1450 1700 CaC 1450 CaC 1750 2000 CaC 1750 CaC 1950 2200 CaC 1950 CaC 2150 2400 The following XP -Storm model file names were used in the evaluation of proposed conditions: • 10yr_1-25-13 Proposed.xp (10 -year event) • 25yr_1-25-13 Proposed.xp (25 -year event) • 50yr_1-25-13 Proposed.xp (50 -year event) • 100yr_1-25-13 Proposed.xp (100 -year event) Project Benefits The Capri Creek terracing project will result in reduced flooding in the reach between McDowell Boulevard and Maria Drive. The maximum water surface elevation reduction occurs at model node CaC-1750 and is summarized in Table 2 for each modeled event. WEST Consultants, Inc. 4 of 44 EXHIBIT 3 February 13, 2013 Table 2. Maximum Water Surface Elevation Reduction with Terracing at XP - Storm Node CaC_1750 Storm Event Return Interval Maximum Water Surface Elevation Reduction with Terracing feet 10- ear 0.5 25 -year 0.7 50 -year 0.8 100 -year 0.9 Tabular model results comparing existing and proposed conditions along Capri Creek and the Petaluma River are provided in Attachment 2 for the 10-, 25-, 50-, and 100 -year events. WEST Consultants, Inc. 5 of 5 45 EXHIBIT 3 Attachment 1 XP -Storm Cross Section Data for Capri Creek Terracing 46 i I o p LnW i p p O Ln M i a X v p a N X N NW Li. O O i u O t i I x 4 � I j p C? I N d i i i m m m m m m m m ri ((IAVN '4BB;) UOIIEA813 r- (gym � � } i . \ � � � , / , � � i i I I I I I I o I N i Ln N ® a x Ln o t U c o u+ x 4 rL I I o I I v i I I I I I i I i i ti o m m I m m m m m m m m m m m m m m m v v m (GAVN ID91) u01;eAB]3 i C, i I I 0 i i I I I Ln ( i i V ( N O d O , 4a i d a LA ry m N e Q) w�I WIn O YMg I U L ILA CL � j I ( i � i O W m v N N a a O m v m m m m m m m N m m m m m (4AVN 119M u01;eAD13 0 v, o i I _ I m I I ' o N Ln UI i W Ln ( p w � � I I N v � x O,S _ j N CL I I N vr SII III ! I IIS o r I� m N ti o m m m mm m v a a a v m m m m (U"N `laaj) uoi;en813 Cl) F m 2 X W EXHIBIT 3 Attachment 2 XP -Storm Tabular Summaries 53 EXHIBIT 3 Capri Creek Terracing XP -Storm Results Summary - 10 -year Event Flooding Link ID LIS Node D/S Node Peak Discharge (cfs) UIS Node Water Surface Elevation Existing Existing Source With Project Change ' With Project Change Conditions Conditions LCaC_47.1 CaC0047 cc 0040 77 77 28.76 28.75 LCaC_47.2 CaC7_0047 cc_0040 70 70 28.76 28.75 1-CaC_47.3 CaC_0047 cc_0040 102 102 28.76 28.75 UW_CaC0047 CaC_0047 CaC_TP30 0 0 28.49 28.49 LCaC_350 CaC_0350 CaC_0047 244 244 29.03 29.02 UW_cacL150 CaC_0350 CaC_1-150 0 0 29.90 29.90 LCaC_584 CaC_0584 CaC_0350 245 244 29.75 29.75 LCaC_850.1 CaC_0850 CaC_0584 227 227 34.33 34.33 Unk1258 CaC_0850 CaC_1-10 0 0 34.33 34.33 Link1262 CaC_0850 CaC R10 67 66 34.33 34.33 UWCaC0850 CaC_0850 CapriStor 48 48 29.00 29.00 LCaC_1050 CaC_1050 CaC_0850 294 294 34.50 34.36 -0.14 1-CaC_1250 CaC_1250 CaC_1050 295 295 34.94 34.63 -0.31 LCaC_1450 CaC_1450 CaC_1250 295 295 35.66 35.37 -0.29 1-CaC_1750 CaC_1750 CaC_1450 295 295 37.42 36.91 -0.51 1-CaC_1950 CAC_1950 CaC_1750 295 295 38.63 38.36 -0.27 LCaC_2150 CaC_2150 CAC -1950 295 295 39.54 39.50 -0.04 LCaC_2241 CaC_2241 CaC_2150 295 296 40.51 40.51 2350weir CaC_2350 CaC_2241 25 26 36.94 36.94 LCaC2350.1 CaC2350 CaC_2241 271 271 42.44 42.44 LCaC_2850 CaC7_2850 CaC_2350 277 277 44.84 44.84 LCaC_3250 CaC_3250 CaC_2850 278 278 48.34 48.34 LCaC_3650 CaC_3650 CaC3250 278 278 51.43 51.43 ICaC 3898 CaC_3898 CaC__3650 278 278 52.80 52.80 LCaC_3900 CaC_3900 CaC_3898 279 278 53.69 53.69 LCaC4044.1 CaC_4044 CaC_3900 267 266 55.62 55.61 UWCac4044 CaC_4044 CaC_3900 17 16 49.35 49.35 ICaC_4446 CaC_4446 CaC_4044 251 250 -1 55.60 55.60 ICaC_4448 CaC_4448 CaC_4446 251 251 56.24 56.24 LCaC_4450 CaC_4450 CaC_4448 252 252 57.44 57.44 ICaC_4846 CaC_4846 CaC_4450 253 253 58.09 58.09 ICaC_4848 CaC_4848 CaC4846 253 253 59.36 59.36 LCaC_4850 CaC_4850 CaC7_4848 253 253 61.28 61.28 Link1346 CaC_5171 CaC51711-10 5 5 64.94 64.94 Link1354 CaC_5171 CaC_4850 253 253 64.94 64.94 LCaC_5181 CaC_5181 CaC_5171 256 256 65.40 65.40 LCaC_5548 CaC_5548 CaC_5181 258 258 67.57 67.57 LCaC_5902 CaC_5902 CaC_5548 275 275 75.27 75.27 LCaC_6105 CaC_6105 CaC_5902 276 276 78.75 78.75 ICaC_6200 CaC_6200 CaC6105 276 276 84.22 84.22 Link1278 CaCL02 CaC7L04 2 2 34.10 34.08 -0.02 UW_cacL04 CaC__L04 CaC_L20 1 0 34.00 34.00 cacL130 CaC_L04 CaC7_1-130 0 0 34.00 34.00 Link1259 CaC_L10 CaC_L20 0 0 34.67 34.67 UW_cacl-110 CaC_L100 CaCL110 0 0 33.33 33.33 Link1447 CaC_L110 CaC7L160 0 0 33.33 33.33 Link1451 CaC_L120 CaC7L140 0 0 33.90 33.90 Link1455 CaC_L120 CaC71-110 0 0 33.90 33.90 Link1452 CaC_L130 CaC71-150 0 0 34.02 34.01 Link -1454 CaC_1-130 CaC7_1-120 0 0 34.02 34.01 Capri Link1449 CaC_L140 CaC_1-170 0 0 30.44 30.44 Creek Link1453 CaC_L150 CaC_1-140 0 0 30.10 30.05 -0.05 Link1448 CaC_L160 CaC_1-140 0 0 29.63 29.62 Link1450 CaC_L170 CaC_0047 0 0 30.00 30.00 Link1260 CaC_1-20 CaC_L30 0 0 34.03 34.02 UW cacl.50 CaC 1-20 CaC 1-50 0 0 33.65 33.65 1 of4 54 MORI 3r1w Capri Creek Terracing XP -Storm Results Summary - 10 -year Event 2 of4 55 Peak Discharge (cfs) U/S Node Water Surface Elevation Flooding Existing Existing Link ID UIS Node DIS Node Source With Project Change With Project Change Conditions Conditions Link1261 CaC_L30 CaCL40 0 0 32.85 32.84 -0.01 UW_cacl-40 CaC_L40 CaC__L100 0 0 33.60 33.60 Link1440 CaC_L50 CaC_L60 0 0 33.65 33.65 Linkl441 CaC_1-50 CaC_1-70 0 0 33.65 33.65 Linkl444 CaC_1-70 CaC_1-100 0 0 33.60 33.60 Link1263 CaC_R10 CaC_R20 66 66 34.33 34.33 Link1417 CaC_R100 CaCR110 1 1 33.61 33.60 -0.01 Link1438 CaC_R100 CaC7_TP40 13 11 -2 33.61 33.60 -0.01 Link1418 CaC_R110 CaC_R190 0 0 33.10 33.09 Linkl420 CaC_R110 C@C_Rl20 0 0 33.10 33.09 Linkl421 CaC_R120 CaC_R150 0 0 30.12 30.11 Link1422 CaC_R150 CaC_R160 0 0 29.02 29.01 -0.01 Link1423 CaC_R160 CaC_R180 0 0 27.90 27.89 Link1424 CaC_R180 CaC_R200 0 0 27.21 27.19 -0.02 Link1428 CaC_R190 CaC_R180 0 0 32.98 32.98 Link1264 CaR20 CaC_R30 14 14 34.12 34.10 -0.02 Link1267 CaCR20 CaC_R60 38 35 -4 34.12 34.10 -0.02 Link1269 CaC7_R20 CaC_R80 12 12 34.12 34.10 -0.02 Link1425 CaC_R200 CaC_R210 0 0 28.00 28.00 Link1265 CaC_R30 CaC_R40 2 1 34.12 34.10 -0.02 Link1266 CaC_R40 CaC_R50 0 0 34.12 34.10 -0.02 Lin1<1415 CaC_R50 CaC_R52 0 0 34.05 34.04 -0.01 1-101416 CaC_R52 CaC_R54 0 0 33.75 33.73 -0.02 Link1268 CaC_R60 CaC_R70 34 31 -3 34.12 34.10 -0.02 CaC_R70 CaC_TP10 6 4 -2 33.70 33.70 Link1271 CaC_R70 CaC_R72 23 20 -3 34.12 34.10 -0.02 Link1277 CaC_R70 CaC_1-02 3 3 34.12 34.10 -0.02 UW_cacR70 CaC_R70 CaC_TP10 6 4 -2 33.70 33.70 Link1272 CaC_R72 CaC_R74 6 6 34.03 34.02 UW_cacR72 CaC_R72 CaC_R100 21 18 -2 33.40 33.40 Link1273 CaC_R74 CaC_R76 1 0 34.04 34.03 UW_cacR76 CaC_R76 CaC_R110 0 0 33.00 33.00 Link1270 CaC_R80 CaC_R90 2 1 34.12 34.10 -0.02 Linkl274 CaC_R90 CaC_R92 0 0 34.12 34.10 -0.02 Link1279 CaC_TP10 CaC_TP15 4 3 -2 33.79 33.77 -0.02 Link1286 CaC_TP15 CaC_TP20 2 1 -1 30.88 30.85 -0.03 Linkl287 CaC_TP15 CaC_TP40 2 1 30.88 30.85 -0.03 Link1280 CaC_TP20 CaC_TP30 2 1 30.32 30.27 -0.04 Link1295 CaC_TP30 CaC_TP50 2 1 28.60 28.56 -0.03 Linkl288 CaC_TP40 CaC_TP50 14 12 -2 30.12 30.12 Linkl289 CaC_TP50 CaC_TP70 9 7 -3 28.56 28.51 -0.05 Link1292 CaC_TP70 CaC_TP80 1 1 28.56 28.51 -0.05 UW_cacTP70 CaC_TP70 CaR130 -753 -753 30.35 30.35 Link1293 CaC_TP80 CaC_TP90 1 1 28.53 28.49 -0.05 Linkl439 CaC_TP90 pr_0510 1 1 27.58 27.54 -0.04 Ipr_0020 pr_0020 pr_0010 8510 8504 -6 6.53 6.53 Ipr_0030 pr_0030 pr_0020 8509 8503 -6 6.59 6.59 Ipr_0040 pr_0040 pr 0030 8508 8502 -6 6.65 6.65 Ipr_0050 pr 0050 pr 0040 7083 7077 -6 6.73 6.73 Ipr_0060 pr_0060 pr_0050 7075 7069 -5 6.76 6.76 Ipr_0070 pr_0070 pr_0060 7069 7064 -5 6.93 6.93 Ipr_0080 pr_0080 pr_0070 7066 7062 -5 6.98 6.98 Ipr_0090 pr_0090 pr_0080 7064 7059 -5 7.05 7.05 Ipr_0100 pr_0094 pr 0090 6520 6515 -5 7.07 7.07 Link1230 pr 0096 pr 0094 6517 6512 -5 7.19 7.18 Link1229 pr 0098 pr 0096 6516 6511 -5 7.23 7.23 2 of4 55 EXHIBIT 3 Capri Creek Terracing XP -Storm Results Summary -10-year Event Flooding Source Link ID U/S Node DIS Node Peak Discharge (cfs) U/S Node Water Surface Elevation ExistingExisting With Project Change With Project Change Conditions Conditions Link1228 pr_0100 pr 0098 6515 6510 -4 7.27 7.27 Ipr_0110 pr_0110 pr_0100 6482 6477 -5 7.33 7.33 Ipr_0120 pr_0120 pr_0110 6480 6475 -5 7.33 7.33 Ipr_0130 pr_0130 pr_0120 6478 6473 -5 7.38 7.38 Ipr_0140 pr_0140 pr_0130 6478 6473 -5 7.43 7.42 Ipr_0150 pr_0150 pr 0140 6480 6475 -5 7.50 7.50 Ipr_0160 pr_0160 pr 0150 6268 6263 -5 7.61 7.61 Ipr_0170 pr -0170 pr 0160 6263 6257 -6 7.67 7.67 Ipr_0180 pr_0180 pr_0170 6241 6235 -6 7.71 7.71 Ipr_0190 pr_0190 pr_0180 6241 6235 -6 7.76 7.75 Ipr_0195 p11-0195 pr_0190 6204 6200 -4 7.87 7.87 Ipr_0200 pr_0200 pr_0195 5691 5689 -2 7.94 7.94 Links 239 pr_0206 pr_0200 5660 5658 -2 7.96 7.96 Ipr_0208 pr_0208 pr_0206 5658 5656 -2 8.04 8.03 Ipr_0210 pr_0210 pr_0208 5656 5654 -2 8.03 8.02 Ipr_0220 pr_0220 pr_0210 5639 5638 -2 8.07 8.07 Ipr_0230 pr_0230 pr_0220 5636 5634 -2 8.08 8.07 Ipr_0240 pr_0240 pr_0230 5631 5628 -3 8.08 8.08 Ipr_0250 pr_0250 pr 0240 5628 5626 -2 8.08 8.08 Ipr_0260 pr_0260 pr 0250 5626 5623 -3 8.09 8.08 Ipr_0270 pr_0270 pr 0260 5624 5622 -3 8.09 8.09 Ipr_0280 pr_0280 pr_0270 5623 5621 -2 8.11 8.10 Ipr_0290 pr_0290 pr_0280 5622 5620 -2 7.99 7.99 Ipr_0298 pr_0298 pr_0290 5505 5510 5 8.39 8.39 Ipr_0300 pr_0300 pr_0298 5505 5510 5 8.53 8.52 Ipr_0308 pr_0308 pr_0300 5505 5510 5 8.73 8.73 Ipr_0310 pr_0310 pr_0308 5505 5510 5 8.86 8.86 Ipr_0320 pr_0320 pr_0310 5505 5510 5 8.77 8.77 Ipr_0322 pr_0322 pr_0320 5472 5472 19.42 19.42 Ipr_0330 pr_0330 pr_0320 5505 5510 5 8.88 8.88 Ipr_0338 pr_0338 pr_0330 5483 5488 5 9.18 9.18 Ipr_0340 pr_0340 pr 0338 5483 5488 5 9.44 9.44 Ipr_0350 pr_0350 pr 0340 5483 5488 5 9.78 9.78 Ipr_0360 pr_0360 pr 0350 5483 5488 5 10.98 10.98 Ipr_0370 pr_0370 pr 0360 5433 5438 5 11.68 11.69 Ipr_0380 pr_0380 pr_0370 5433 5438 5 12.19 12.19 Ipr_0390 pr_0390 pr_0380 4941 4945 4 13.05 13.06 Ipr_0400 pr_0400 pr_0390 4404 4408 3 13.25 13.25 Ipr_0410 pr_0410 pr 0400 60 60 21.97 21.97 Ipr_0420 pr_0420 pr 0400 4404 4407 3 13.50 13.51 Ipr_0430 pr_0430 pr_0420 4404 4407 3 13.69 13.69 Ipr_0440 pr_0440 pr_0430 4404 4407 3 15.11 15.12 Ipr_0445 pr_0445 pr_0440 4403 4406 3 16.07 16.08 Ipr_0448 pr_0448 pr 0445 4403 4406 3 16.32 16.33 Petaluma Ipr_0450 pr_0450 pr_0448 4403 4406 3 16.54 16.55 River Ipr_0452 pr_0452 pr 0450 4403 4406 3 16.70 16.71 Ipr_0458 pr_0458 pr_0452 4404 4407 3 16.98 16.99 Ipr_0460 pr_0460 pr 0458 4404 4407 3 17.11 17.11 Ipr_0465 pr_0465 pr_0460 4377 4380 3 17.34 17.34 Ipr_0470 pr0470 pr_0465 4378 4381 3 17.47 17.47 Ipr_0480 pr_0480 pr_0470 43794382 3 17.72 17.73 Ipr_0490 pr_0490 pr_0480 4380 4383 3 1821 18.21 Ipr_0496 pr_0496 pr_0490 4382 4385 3 18.4318.43 Ipr_0498 pr_0498 pr_0496 4383 4386 3 18.97 18.97 Ipr_0500 pr_0500 pr 0498 4384 4387 3 19.04 19.04 Ipr_0510 pr_0510 pr 0500 4385 4388 3 19.34 19.34 3 of 56 EXHIBIT 3 Capri Creek Terracing XP -Storm Results Summary -10-year Event Flooding Source Link ID UIS Node DIS Node Peak Discharge (cfs) UIS Node Water Surface Elevation Existing With Project Change' Existing With Project Change' Conditions Conditions Ipr_0520 pr_0520 pr -051 0 4358 4361 3 19.78 19.79 Ipr_0530 pr_0530n pr 0520 4361 4364 3 20.20 20.20 Ipr_0540 pr_0540n pr_0530n 4364 4367 3 21.01 21.01 1pr_O550 pr_0550 pr_0540n 3876 3878 2 21.55 21.55 Ipr_0552 pr_0552 pr 0550 3878 3880 1 21.65 21.65 3876.1 pr_0554 pr 0552 3879 3880 1 21.62 21.62 3876.2 pr_0554 pr 0552 0 0 21.62 21.62 Ipr_0560 pr 0560 pr 0554 3879 3881 1 22.11 22.12 Ipr_0570 pr_0570 pr_0560 3891 3892 1 24.16 24.16 Ipr_0580 pr_0580 pr_0570 3892 3893 1 25.13 25.13 Ipr_0590 pr_0590n pr_0580 3929 3929 26.85 26.85 Ipr_0600 pr_0600n pr_0590n 4078 4078 27.32 27.32 Ipr_0606 pr_0606n pr_0600n 4029 4030 28.03 28.03 2150.1 pr 0607n pr 0606n 4033 4033 28.29 28.29 UWCorona pr 0607n pr_0606n 0 0 11.26 11.26 Ipr_0608 pr_O608n pr_O607n 4033 4033 28.32 28.32 Ipr_0610 pr_O610n pr 0608n 3591 3591 28.68 28.68 Ipr_0612 pr_O612n pr_0610n 3584 3585 28.84 28.84 Ipr_0614 pr_0614n pr_0612n 3578 3578 28.99 28.99 Ipr_0616 pr_0616n pr_0614n 3555 3556 29.08 29.08 pr_0618 pr_061 Bn pr_0616n 3546 3547 29.33 29.33 Ipr_0620 pr_0620n pr_0618n 3539 3540 30.04 30.04 Ipr_0630 pr_0630n pr_0620n 3537 3537 30.54 30.54 Ipr_0640 pr 0640n pr 0630n 3537 3537 31.44 31.44 Ipr_0650 pr 0650 pr 0640n 3538 3538 31.52 31.52 Ipr_0660 pr 0660 pr 0650 3548 3548 31.65 31.65 Ipr_0670 pr_0670n or 0660 3562 3563 32.35 32.35 Ipr_0680 pr_0680n pr 0670n 3552 3553 32.40 32.40 2792.1 pr 0682 pr 0680n 3557 3557 32.51 32.51 6821ob pr_0682 pr 0680n 0 0 15.70 15.70 2791.1 pr_0684 pr_0682 3557 3558 32.63 32.63 684lob pr_0684 pr_0682 D 0 15.89 15.89 Ipr_0690 pr_0690n pr_0684 3558 3559 32.58 32.58 Ipr_0700 pr_0700 pr_0690n 3565 3565 32.75 32.76 Ipr_0710 pr 0710 pr 0700 3567 3567 34.73 34.73 Ipr_0720 pr 0720 pr 0710 3532 3533 35.69 35.69 Ipr_0723 pr_0723 pr 0720 3533 3533 36.93 36.93 3663.1 pr_0725 pr_D723 1087 1088 1 37.39 37.39 3663.2 pr_0725 pr_0723 3032 3031 37.39 37.39 Ipr_0730 pr_0730 pr_0725 3533 3533 37.65 37.65 Ipr_0740 pr_0740 pr_0730 3587 3588 37.74 37.74 2526.1 pr_0745 pr_0740 3239 3239 38.06 38.06 2526.2 pr_0745 pr_0740 348 349 38.06 38.06 Ipr_0750 pr 0750 pr_0745 3587 3587 38.19 38.19 Ipr_0760 pr_0760 pr_0750 3587 3587 38.33 38.33 Notes: (1) Change due to project --negative values indicate a decrease, and positive values an increase. Differences in discharge less than 1 cis and water surface elevation less than 0.01 feet are left blank. 4 of 57 r=:(:rr3rI3 Capri Creek Terracing XP -Storm Results Summary - 25 -year Event Flooding Source Link ID U/S Node D/S Node Peak Discharge (cfs) U/S Node Water Surface Elevation Existing With Project Change' Existing With Project Change' Conditions Conditions LCaC_47.1 CaC_0047 cc 004G 87 84 -3 29.08 28.98 -0.11 LC2C_47.2 CaC_0047 cc 0040 79 76 -3 29.08 28.98 -0.11 LCaC_47.3 CaC_0047 cc_0040 112 107 -5 29.08 28.98 -0.11 UW_CaC0047 CaC_0047 CaC_TP30 -19 -17 -2 28.49 28.49 LCaC_350 CaC_0350 CaC_0047 267 258 -9 29.32 29.22 -0.10 UW_cacl-150 CaC_0350 CaC_1-150 0 0 29.90 29.90 LCaC_584 CaC_0584 CaC_0350 268 259 -9 29.98 29.90 -0.08 LCaC_850.1 CaC_0850 CaC_0584 236 236 34.49 34.49 Link1258 CaC_0850 CaC_1-10 0 0 34.49 34.49 Link1262 CaC_0850 CaC R10 145 144 34.49 34.49 UWCaC0850 CaC_0850 CapriStor 48 48 29.00 29.00 LCaC1050 CaC_1050 CaC_0850 382 381 34.75 34.53 -0.22 LCaC7_1250 CaC_1250 CaC_1050 382 382 35.29 34.85 -0.44 LCaC1450 CaC_1450 C2C_1250 382 382 36.06 35.58 -0.48 LCaC7_1750 CaC1750 CaC_1450 382 382 37.81 37.12 -0.69 LCaC_1950 CAC7_1950 CaC_1750 383 383 39.02 38.63 -0.40 LCaC_2150 CaC_2150 CAC_1950 383 383 39.95 39.89 -0.06 LCaC_2241 CaC_2241 CaC2150 383 383 40.88 40.88 2350weir CaC_2350 CaC7_2241 123 122 36.94 36.94 LCaC2350.1 CaC_2350 CaC_2241 274 274 42,72 42.72 LCaC_2850 CaC_2850 CaC_2350 359 359 45.15 45.15 LCaC_3250 CaC_3250 CaC_2850 359 360 48.69 48.69 LCaC_3650 CaC_3650 CaC_3250 360 360 51.76 51.76 ICaC 3898 CaC_3898 CaC_3650 360 360 53.17 53.17 LCaC_3900 CaC_3900 CaC3898 360 360 54.08 54.08 LCaC4044.1 CaC_4044 CaC3900 271 271 55.92 55.92 UWCac4044 CaC_4044 CaC___3900 108 108 49.35 49.35 ICaC_4446 CaC_4446 CaC_4044 325 325 55.90 55.90 ICaC_4448 CaC_4448 CaC_4446 326 326 56.64 56.64 LCaC_4450 CaC_4450 CaC_4448 327 327 57.91 57.92 ICaC_4846 CaC_4846 CaC_4450 327 327 58.46 58.46 ICaC_4848 CaC_4848 CaC_4846 327 327 59.74 59.74 LCa4850 CaC4850 CaC_4848 327 327 61.68 61.68 Link1346 CaC7_5171 CaC5171 L10 8 8 65.45 65.45 Link1354 CaC5171 CaC_4850 327 327 65.45 65.45 LCaC_5181 CaC5181 CaC_5171 331 331 65.91 65.91 LCaC_5548 CaC__5548 CaC_5181 335 335 67.91 67.91 LCaC_5902 CaC75902 CaC_5548 353 353 75.33 75.33 LCaC_6105 CaC76105 CaC_5902 354 354 78.83 78.83 ICaC_6200 CaC76200 CaC_6105 354 354 84.41 84.41 LMAU78 CaC71-02 CaC_L04 9 9 34.33 34.33 UW_cacl-04 CaC71-04 CaC_L20 5 5 34,00 34.00 UW_cacl-130 CaC7_1-04 CaC_1-130 4 4 34.00 34.00 Link1259 CaC_1-10 CaC_1-20 0 0 34.67 34.67 UW_cacL110 CaC_1-100 CaC_1-110 0 0 33.33 33.33 Link1447 CaC_L110 CaC_1-160 0 0 33.34 33.34 Link1451 CaC_1-120 CaC_1-140 0 0 33.94 33.94 Link1455 CaC_1-120 CaC_L110 0 0 33.94 33.94 Link -1452 CaC_L130 CaC_1-150 3 3 34.09 34.08 Link -1454 CaC_1-130 CaC_1-120 0 0 34.09 34.08 Capri Link1449 CaC_1-140 CaC_1-170 1 1 30.54 30.54 Creek Link1453 CaC_1-150 CaC_1-140 2 2 30.55 30.54 Link1448 CaC_1-160 CaC_1-140 -1 -1 30.25 30.23 -0.02 Link1450 CaC_1-170 CaC_0047 0 0 30.14 30.13 Link1260 CaC_1-20 CaC_1-30 0 0 34.14 34.14 UW cacl-50 CaC 1-20 CaC 1-50 1 1 33.65 33.65 1 of 4 58 EXHIBIT 3 Capri Creek Terracing XP -Storm Results Summary - 25 -year Event 2 of4 wt Peak Discharge (cfs) U/S Node Water Surface Elevation Flooding Existing With Project Change' Existing With Project Change' Source Link ID U/S Node D/S Node Conditions Conditions Link1261 CaC_1-30 CaC_1-40 0 0 33.05 33.04 UW_cacl-40 CaC_1.40 CaC_1-100 0 0 33.60 33.60 Link1440 CaC_1-50 CaC_1-60 0 0 34.02 34.01 Link -1441 CaC_1-50 CaC_1.70 0 0 34.02 34.01 Link1444 CaC_1-70 CaC_1-100 0 0 33.60 33.60 Link1263 CaC_R10 CaC_R20 145 144 34.49 34.49 Link1417 CaC_R100 CaC_R110 3 3 33.74 33.74 Link1438 CaC_R100 CaC_TP40 52 51 33.74 33.74 Link1418 CaC_R110 CaC_R190 1 1 33.24 33.24 Link1420 CaC_R110 CaC_R120 4 4 33.24 33.24 Link1421 CaC_R120 CaC_R150 4 4 30.26 30.26 Link -1422 CaC_R150 CaC_R160 3 3 29.28 29.27 Unk1423 CaC_R160 CaC_R180 3 3 27.99 27.99 Unk1424 CaC_R180 CaC_R200 0 0 27.71 27.69 -0.02 Link1428 CaC_R190 CaC_R180 1 1 33.04 33.04 Link1264 CaC_R20 CaC_R30 24 25 2 34.42 34.42 Link1267 CaC_R20 CaC_R60 129 127 -2 34.42 34.42 Link1269 CaCR20 CaC_R80 17 18 1 34.42 34.42 Link1425 CaC__R200 CaC_R210 0 0 28.00 28.00 Link1265 CaC_R30 CaC_R40 6 6 34.43 34.42 Link1266 CaC_R40 CaC_R50 4 4 34.43 34.42 Link1415 CaC_R50 CaC_R52 4 4 34.30 34.29 -0.01 Link1416 CaC_R52 CaC_R54 0 0 34.30 34.29 -0.01 Link1268 CaC_R60 CaC_R70 128 126 -2 34.42 34.42 CaC_R70 CaC_TP10 54 53 -1 33.70 33.70 Link1271 CaC_R70 CaC_R72 63 63 34.39 34.39 Link1277 CaC_R70 CaC_1-02 10 9 34.39 34.39 UW_cacR70 CaC_R70 CaC_TP10 54 53 -1 33.70 33.70 Link1272 CaC_R72 CaC_R74 8 8 34.15 34.15 UW_cacR72 CaC_R72 CaC_R100 57 57 33.40 33.40 Unk1273 CaC_R74 CaC_R76 3 3 34.15 34.14 UW_cacR76 CaC_R76 CaC_R110 3 3 33.00 33.00 Link1270 CaC_R80 CaC_R90 4 4 34.42 34.42 Link -1274 CaC_R90 CaC_R92 0 0 34.43 34.42 Link1279 CaC_TP10 CaC_TP15 53 52 -1 33.99 33.99 Link1286 CaC_TP15 CaC_TP20 34 33 31.16 31.15 Link1287 CaC_TP15 CaC_TP40 20 19 31.16 31.15 Link1280 CaC_TP20 CaC_TP30 35 35 30.63 30.64 Link1295 CaCTP30 CaCTP50 35 34 29.81 29.79 -0.02 Link1288 CaC7TP40 CaC7TP50 70 68 -2 30.24 30.24 Link1289 CaC7TP50 CaC7_TP70 47 47 29.81 29.79 -0.02 Link1292 CaC7_TP70 CaC_TP80 18 17 29.81 29.79 -0.02 UW_cacTP70 CaC_TP70 CaC_R130 -753 -753 30.35 30.35 Link1293 CaC_TP80 CaC_TP90 18 17 29.72 29.70 -0.02 Link1439 CaC_TP90 pr_0510 17 17 28.44 28.42 -0.02 Ipr_0020 pr 0020 pr 0010 10071 10067 -4 6.53 6.53 Ipr_0030 pr_0030 pr 0020 10071 10067 -4 6.62 6.62 Ipr_0040 pr_0040 pr 0030 10070 10067 -4 6.70 6.70 Ipr_0050 pr_0050 pr_0040 8401 8399 -2 6.81 6.81 Ipr_0060 pr_0060 pr_0050 8401 8398 -3 6.85 6.85 Ipr_0070 pr_0070 pr_0060 8401 8397 -4 7.07 7.07 Ipr_0080 pr_0080 pr 0070 8400 8396 -4 7.14 7.14 Ipr_0090 pr_0090 pr 0080 8399 8395 -4 7.20 7.20 Ipr_0100 pr_0094 pr 0090 7778 7779 1 7.23 7.23 Link1230 pr_0096 pr_0094 7778 7779 1 7.37 7.37 Link1229 pr_0098 pr_0096 7778 7779 1 7.43 7.43 2 of4 wt EXHIBIT 3 Capri Creek Terracing XP -Storm Results Summary - 25 -year Event Flooding Source Link ID UIS Node DIS Node Peak Discharge (cis) UIS Node Water Surface Elevation ExistingExisting With Project Change With Project Change Conditions Conditions Link1228 pr_0100 pr_0098 7778 7779 1 7.48 7.48 pr -0110 pr -0110 pr_0100 7761 7762 1 7.55 7.55 Ipr_0120 pr_0120 pr_0110 7760 7761 1 7.55 7.55 Ipr_0130 pr_0130 pr_0120 7760 7761 1 7.61 7.61 Ipr_0140 pr_0140 pr 0130 7759 7760 1 7.68 7.67 Ipr_0150 pr_0150 pr 0140 7758 7759 1 7.78 7.77 Ipr_0160 pr_0160 pr -01 50 7636 7637 1 7.91 7.91 Ipr_0170 pr_0170 pr 0160 7636 7637 1 7.99 7.99 Ipr_0180 pr_0180 pr_0170 7624 7625 1 8.05 8.05 Ipr_0190 pr_0190 pr_0180 7624 7625 1 8.11 8.11 Ipr_0195 pr_0195 pr_0190 7623 7624 1 8.26 8.26 Ipr_0200 pr_0200 pr -01 95 7350 7352 1 8.37 8.37 Link1239 pr 0206 pr_0200 7333 7334 1 8.40 8.40 Ipr_0208 pr_0208 pr_0206 7333 7334 1 8.53 8.53 Ipr_0210 pr_0210 pr 0208 7333 7334 1 6.52 8.53 Ipr_0220 pr_0220 pr 0210 7324 7325 1 8.60 8.60 Ipr_0230 pr_0230 pr 0220 7324 7325 1 8.61 8.62 Ipr_0240 pr_0240 pr 0230 7324 7326 2 8.62 8.62 Ipr_0250 pr_0250 pr_0240 7325 7326 1 8.62 8.62 Ipr_0260 pr_0260 pr_0250 7325 7327 1 8.63 8.63 Ipr_0270 pr_0270 pr_0260 7326 7327 1 8.64 8.64 Ipr_0280 pr_0280 pr_0270 7326 7327 1 8.66 8.66 Ipr_0290 pr_0290 pr_0280 7326 7328 1 8.49 8.49 Ipr_0298 pr_0298 pr_0290 7221 7223 1 9.08 9.08 Ipr_0300 pr_0300 pr_0298 7222 7223 1 9.27 9.27 Ipr_0308 pr_0308 pr_0300 7222 7223 1 9.58 9.58 Ipr_0310 pr_0310 pr_0308 7223 7224 1 9.74 9.74 Ipr_0320 pr_0320 pr_0310 7223 7224 1 9.62 9.62 Ipr_0322 pr_0322 pr 0320 5472 5472 19.42 19.42 Ipr_0330 pr_0330 pr 0320 7223 7224 1 9.79 9.79 Ipr_0338 pr_0338 pr 0330 7197 7198 1 10.23 10.23 Ipr_0340 pr_0340 pr 0338 7197 7198 1 10.56 10.56 Ipr_0350 pr_0350 pr_0340 7197 7199 1 10.96 10.96 Ipr_0360 pr_0360 pr_0350 7198 7199 1 12.31 12.31 Ipr_0370 pr_0370 pr_0360 7138 7139 1 13.08 13.08 Ipr_0380 pr_0380 pr_0370 7138 7140 1 13.64 13.64 Ipr_0390 pr_0390 pr_0380 6330 6333 3 14.53 14.53 Ipr_0400 pr_0400 pr 0390 5670 5673 3 14.73 14.73 Ipr_0410 pr_0410 pr 0400 60 60 21.97 21.97 Ipr_0420 pr_0420 pr 0400 5669 5672 3 14.99 14.99 Ipr_0430 pr_0430 pr_0420 5669 5672 3 15.18 15.19 Ipr_0440 pr_0440 pr_0430 5668 5670 3 17.22 17.23 Ipr_0445 pr_0445 pr_0440 5666 5668 2 17.68 17.68 Ipr_0448 pr_0448 pr_0445 5664 5666 2 17.83 17.83 Petaluma Ipr_0450 pr_0450 pr_0448 5663 5665 2 17.97 17.98 River Ipr_0452 pr_0452 pr_0450 5661 5664 2 18.09 18.09 Ipr_0458 pr_0458 pr 0452 5660 5662 2 18.30 18.30 Ipr_0460 pr_0460 pr_0458 5659 5662 2 18.40 18.40 Ipr_0465 pr_0465 pr_0460 5624 5626 2 18.60 18.60 Ipr_0470 pr_0470 pr_0465 5623 5626 2 18,69 18.70 Ipr_0480 pr_0480 pr_0470 5623 5625 2 18.95 18.95 Ipr_0490 pr_0490 pr_0480 5622 5624 2 19.44 19.44 Ipr_0496 pr_0496 pr 0490 5622 5624 2 19.59 19.59 Ipr_0498 pr_0498 pr 0496 5622 5624 2 20.24 2024 Ipr_0500 pr_0500 pr_0498 5622 5624 2 20.31 20.32 Ipr_0510 pr_0510 pr_0500 5622 5624 2 20.59 20.60 3 of 60 EXHIBIT 3 Capri Creek Terracing XP -Storm Results Summary - 25 -year Event Flooding Source Link ID U/S Node DIS Node Peak Discharge (cfs) U/S Node Water Surface Elevation Existing With Project Change Existing With Project Change l Conditions Conditions Ipr_0520 pr_0520 pr_0510 5579 5581 2 21.19 21.20 Ipr_0530 pr_0530n pr_0520 5581 5583 3 21.87 21.87 Ipr_0540 pr_0540n pr_0530n 5583 5585 3 22.49 22.49 Ipr_0550 pr_0550 pr_0540n 5038 5040 1 23.31 23.31 pr_0552 pr_0552 pr 0550 5596 5626 30 23.39 23.39 3876.1 pr_0554 pr_0552 5481 5425 -56 23.36 23.36 3876.2 pr_0554 pr_0552 0 0 23.36 23.36 Ipr_0560 pr_0560 pr_0554 6094 5997 -97 23.52 23.52 Ipr_0570 pr_0570 pr 0560 5052 5053 1 24.49 24.49 Ipr_0580 pr_0580 pr 0570 5052 5053 1 25.55 25.55 Ipr_0590 pr_0590n pr_0580 4993 4993 27.41 27.41 Ipr_0600 pr_0600n pr_0590n 5184 5184 27.81 27.81 Ipr-0606 pr_0606n pr_O600n 5115 5115 28.50 28.50 2150.1 pr_0607n pr_0606n 5116 5116 28.87 28.87 UWCorona pr_0607n pr 0606n 0 0 11.26 11.26 Ipr_0608 pr_0608n pr_0607n 5116 5116 28.91 28.91 Ipr_0610 pr_0610n pr_0608n 4302 4302 29.32 29.32 Ipr_0612 pr_0612n pr_0610n 4291 4290 29.45 29.45 Ipr_0614 pr_0614n pr 0612n 4280 4279 29.63 29.63 Ipr_0616 pr_0616n pr_0614n 4248 4248 29.72 29.72 Ipr_0618 pr_0618n pr_0616n 4231 4231 29.92 29.92 Ipr_0620 pr_0620n pr_0618n 4217 4217 30.51 30.51 Ipr_0630 pr_0630n pr_0620n 4214 4213 31.21 31.21 Ipr_0640 pr_0640n pr_0630n 4213 4213 32.73 32.73 Ipr_0650 pr_0650 pr_0640n 4216 4216 32.77 32.77 Ipr_0660 pr_0660 pr_0650 4226 4226 32.82 32.62 Ipr_0670 pr_0670n pr_0660 4245 4245 33.32 33.32 Ipr_0680 pr_0680n pr_0670n 4248 4248 33.36 33.36 2792.1 pr_0682 pr_0680n 4247 4247 33.61 33.61 682lob pr 0682 pr_0680n 43 43 15.70 15.70 2791.1 pr 0684 pr 0682 4202 4202 33.88 33.88 6841ob pr_0684 pr 0682 155 155 15.89 15.89 Ipr_0690 pr_0690n pr 0684 4273 4273 33.81 33.81 Ipr_0700 pr_0700 pr_0690n 4296 4296 33.88 33.88 Ipr_0710 pr_0710 pr_0700 4310 4310 35.26 35.26 Ipr_0720 pr_0720 pr_0710 4275 4274 36.07 36.07 Ipr_0723 pr_0723 pr 0720 4276 4276 37.25 37.25 3663.1 pr 0725 pr_0723 2312 2312 37.55 37.55 3663.2 pr 0725 pr_0723 3030 3030 37.55 37.55 Ipr_0730 pr_0730 pr 0725 4276 4276 37.70 37.70 Ipr_0740 pr_0740 pr 0730 4320 4320 37.86 37.86 2526.1 pr_0745 pr 0740 3500 3500 3829 38.29 25262 pr_0745 pr 0740 820 820 38.29 38.29 Ipr_0750 pr_0750 pr 0745 4320 4320 38.56 38.56 Ipr_0760 pr 0760 pr 0750 4320 4320 38.73 38.73 Notes: (1) Change due to project -negative values indicate a decrease, and positive values an increase. Differences in discharge less than 1 cis and water surface elevation less than 0.01 feet are left blank. 4 of 1.2 EXHIBIT 3 Capri Creek Terracing XP -Storm Results Summary - 50 -year Event Flooding Source Link ID UIS Node D/S Node Peak Discharge ids) U/S Node Water Surface Elevation Existing With Project Change' Existing With Project Change' Conditions Conditions LCaC_47.1 CaC_0047 cc 0040 98 98 29,51 29.48 -0.03 LCaC_47.2 CaC_0047 cc 0040 90 89 29.51 29.48 -0.03 LCaC_47.3 CaC_0047 cc_0040 119 118 29.51 29.48 -0.03 UW_CaC0047 CaC_0047 CaC_TP30 -64 -62 -2 28.49 26.49 LCaC_350 CaC_0350 CaC_0047 290 282 -8 29.74 29.71 -0.03 UW_cacL150 CaC_0350 CaC_L150 0 0 29.90 29.90 LCaC_584 CaC_0584 CaC_0350 294 287 -7 30.28 30.20 -0.08 LCaC_850.1 - CaC_0850 CaC0584 239 239 34.57 34.57 Link1258 CaC_0850 CaC7_1-10 0 0 34.57 34.57 Link1262 CaC_0850 CaC R10 193 192 34.57 34.57 UWCaC0850 CaC_0850 CapriStor 48 48 29.00 29.00 LCaC_1050 CaC_1050 CaC_0850 432 431 34.88 34.62 -0.26 LCaC_1250 CaC_1250 CaC_1050 432 431 35.47 34.96 -0.51 LCaC_1450 CaC_1450 CaC_1250 432 432 36.26 35.69 -0.57 LCaC_1750 CaC_1750 CaC_1450 432 432 38.01 37.23 -0,77 LCac1950 CAC_1950 CaC_1750 432 432 39.22 38.76 -0,46 LCaC7_2150 CaC2150 CAC_1950 432 432 40.15 40.08 -0.08 LCaC_2241 _2241 CaC7 CaC_2150 433 432 41.08 41.08 2350weir CaC 2350 CaC_2241 178 178 36.94 36.94 LCaC2350.1 CaC_2350 CaC_2241 274 274 42.82 42.82 LCaC_2850 Ca2850 CaC_2350 398 397 45.29 45.29 LCaC_3250 Ca3250 CaC_2850 399 398 49.35 49.35 LCaC_3650 CaC_3650 CaC_3250 418 418 51.97 51.97 ICaC_3898 CaC_3898 CaC_3650 418 418 53.43 53.43 LCa3900 CaC_3900 CaC3898 419 419 54.32 54.32 LCaC4044.1 CaC_4044 CaC73900 274 273 56.01 56.01 UWCac4044 CaC_4044 CaC7_3900 182 182 49.35 49.35 ICaC 4446 CaC_4446 CaC_4044 380 380 55.98 55.98 ICaC 4448 CaC_4448 CaC_4446 380 380 56.85 56.85 LCaC_4450 CaC_4450 CaC4448 380 380 58.20 58.20 (CaC_4846 CaC_4846 CaC7_4450 380 380 58.69 58.69 ICaC_4848 CaC_4848 CaC4846 380 380 59.98 59.98 LCaC_4850 CaC_4850 CaC7_4848 380 380 61.94 61.94 Link1346 CaC_5171 CaC51711-10 12 12 65.77 65.77 Link1354 CaC_5171 CaC_4850 380 380 65.77 65.77 LCaC_5181 CaC_5181 CaC_5171 385 385 66.24 66.24 LCaC_5548 CaC_5548 CaC_5181 390 390 68.13 68.13 LCaC_5902 CaC5902 CaC_5548 408 408 75.36 75.36 LCaC_6105 CaC76105 CaC_5902 409 409 78.89 78.89 ICaC_6200 CaC76200 CaC_6105 410 409 84.52 84.52 1-ink1278 CaC71-02 CaC_L04 14 14 34.40 34.40 UW_cacl-04 CaC__L04 CaC_L20 6 7 34.00 34.00 U\Ai CaC_L04 CaC_1-130 7 7 34.00 34.00 Link1259 CaC_L10 CaC_1-20 0 0 34.67 34.67 UW_cacL110 CaC_L100 CaC_L710 0 0 33.33 33.33 Link1447 CaC_L110 CaC_1-160 0 0 33.34 33.34 Link1451 CaC_L120 CaC_L140 0 0 33.95 33.95 Link1455 CaL120 CaC_L110 0 0 33.95 33.95 Link1452 CaC_L130 CaCL150 6 6 34.12 34,12 Link1454 CaC_L130 CaC__L120 0 0 34.12 34,12 Capri Link1449 CaC_L140 CaC_L170 2 2 30.61 30.61 Creek Link1453 CaC_L150 CaC_1-140 6 6 30.64 30.64 Link1448 CaC_1-160 CaC_1-140 4 -4 30.55 30.55 Link -1450 CaC_1-170 CaC_0047 2 2 30.20 30.20 Link1260 CaC_1-20 CaC_1-30 11 34.17 34.17 UW cacl-50 CaC 1-20 CaC 1-50 3 3 33.65 33.65 1 of 4 62 EXHIBIT 3 Capri Creek Terracing XP -Storm Results Summary - 50 -year Event 2of4 63 Peak Discharge (cfs) UIS Node Water Surface Elevation Flooding Existing With Project Change Existing With Project Change Source Link ID U/S Node D/S Node Conditions Conditions Link1261 CaC_1-30 CaC_1-40 0 0 33.15 33.14 UW_cacl-40 CaC_L40 CaC_L100 0 0 33.60 33.60 Link1440 CaC_1-50 CaC_1-60 0 0 34.13 34.12 Link1441 CaC_1-50 CaC_1-70 0 0 34.13 34.12 Link1444 CaC_1-70 CaC_1-100 0 0 33.60 33.60 Link1263 CaC_R10 CaC_R20 193 192 34.57 34.57 Link1417 CaC_R100 CaC_R110 4 4 33.77 33.77 Link1438 CaC_R100 CaC_TP40 70 70 33.77 33.77 Link1418 CaC_R110 CaC_R190 1 1 33.30 33.29 Link1420 CaC_R110 CaC_R120 7 6 33.30 33.29 Link1421 CaC_R120 CaC_R150 6 6 30.34 30.34 Link1422 CaC_R150 CaC_R160 6 6 29.36 29.36 Link1423 CaC_R160 CaC_R180 6 6 28.04 28.04 Link1424 CaC_R180 CaC_R200 0 0 28.03 28.02 Link1428 CaC_R190 CaC_R180 1 1 33.06 33.06 Link1264 CaC_R20 CaCR30 24 27 2 34.54 34.54 Link1267 CaC_R20 CaC__R60 180 180 34.54 34.54 Link1269 CaC_R20 CaC_R80 19 21 2 34.54 34.54 Link1425 CaC_R200 CaC_R210 0 0 28.03 28.02 Link1265 CaC_R30 CaC_R40 10 9 34.54 34.54 Link1266 CaCR40 CaC_R50 9 9 34.54 34.54 Link1415 CaC7R50 CaC_R52 8 8 34.53 34.53 Link1416 CaC7_R52 CaC_R54 0 0 34.54 34.53 Link1268 CaC_R60 CaC_R70 180 179 34.54 34.54 CaC_R70 CaC_TP10 84 83 33.70 33.70 Link1271 CaC_R70 CaC_R72 81 81 34.49 34.49 Link1277 CaC_R70 CaC_1-02 14 14 34.49 34.49 UW_cacR70 CaC_R70 CaC_TP10 84 83 33.70 33.70 Link1272 CaC_R72 CaC_R74 8 8 34.20 34.20 UW_cacR72 CaC_R72 CaC_R100 74 74 33.40 33.40 Link1273 CaC_R74 CaC_R76 5 5 34.19 34.19 UW_cacR76 CaC_R76 CaC_R710 5 5 33.00 33.00 Link1270 CaC_R80 CaC_R90 4 4 34.54 34.54 Link1274 CaC_R90 CaC_R92 0 0 34.54 34.54 Link1279 CaC_TP10 CaC_TP15 83 83 34.07 34.07 Link1286 CaC_TP15 CaC_TP20 52 52 31.24 31.24 Link1287 CaC_TP15 CaC_TP40 32 31 31.24 31.24 Link1280 CaC_TP20 CaC_TP30 52 52 30.68 30.68 Link -1295 CaC_TP30 CaC_TP50 47 48 1 30.12 30.11 -0.01 Link1288 CaC_TP40 CaCTP50 101 100 30.30 30.30 Link1289 CaC_TP50 CaC__TP70 55 58 3 30.12 30.11 -0.01 Link1292 CaC_TP70 CaTP80 33 32 30.12 30.11 -0.01 UW_cacTP70 CaC_TP70 CaR130 -753 -753 30.35 30.35 Link1293 CaC_TP80 CaC_TP90 32 31 30.02 30.01 -0.01 Link1439 CaC_TP90 pr_0510 30 30 28.72 28.72 Ipr_0020 pr_0020 pr_0010 11039 11034 -5 6.53 6.53 Ipr_0030 pr_0030 pr 0020 11038 11033 -5 6.64 6.64 Ipr_0040 pr_0040 pr 0030 11038 11033 -5 6.73 6.73 Ipr_0050 pr_0050 pr_0040 9475 9480 4 6.89 6.89 Ipr_0060 pr_0060 pr_0050 9474 9478 4 6,94 6.94 Ipr_0070 pr_0070 pr 0060 9473 9477 4 7.20 7.20 Ipr_0080 pr_0080 pr_0070 9472 9476 4 7.28 7.28 Ipr_0090 pr_0090 pr_0080 9471 9475 4 7.37 7.37 Ipr_0100 pr_0094 pr_0090 9143 9148 4 7.40 7.40 Link1230 pr_0096 pr 0094 9143 9148 4 7.59 7.59 Link1229 pr_0098 pr_0096 9143 9148 4 7.68 7.68 2of4 63 EXHIBIT 3 Capri Creek Terracing XP -Storm Results Summary - 50 -year Event Flooding Source Link ID UIS Node D/S Node Peak Discharge (cfs) U/S Node Water Surface Elevation ExistingExisting With Project Change With Project Change Conditions Conditions Linkl228 pr_0100 pr_0098 9143 9148 4 7.74 7.74 1pr_0110 pr_0110 pr_0100 9125 9129 4 7.84 7.84 1pr_0120 pr_0120 pr 0110 9125 9129 4 7.84 7.84 Ipr_0130 pr_0130 pr_0120 9125 9129 4 7.92 7.93 Ipr_0140 pr_0140 pr 0130 9125 9129 4 8.01 8.01 Ipr_0150 pr_0150 pr 0140 9125 9129 4 8.14 8.14 Ipr_0160 pr_0160 pr 0150 8994 8999 5 8.32 8.32 Ipr_0170 pr_0170 pr_0160 8995 9000 5 8.41 8.41 Ipr_0180 pr_0180 pr_0170 8982 8987 5 8.49 8.49 Ipr_0190 pr_0190 pr_0180 8983 8987 5 8.56 8.56 Ipr_0195 pr_0195 pr_0190 8983 8988 5 8.76 8.76 Ipr_0200 pr_0200 pr_0195 8681 8686 5 8.90 8.90 Link1239 pr 0206 pr_0200 8662 8667 5 8.93 8.93 Ipr_0208 pr_0208 pr_0206 8662 8667 5 9.11 9.11 Ipr_0210 pr_0210 pr_0208 8663 8668 5 9.11 9.12 Ipr_0220 pr_0220 pr_0210 8653 8658 5 9.23 9.23 Ipr_0230 pr_0230 pr0220 8654 8659 5 9.25 9.25 Ipr_0240 pr_0240 pr_0230 8656 8660 5 9.25 9.26 Ipr_0250 pr_0250 pr_0240 8657 8662 5 9.26 9.26 Ipr_0260 pr_0260 pr_0250 8658 8663 5 9.27 9.27 Ipr_0270 pr_0270 pr_0260 8658 8663 5 9.28 9.28 Ipr_0280 pr_0280 pr_0270 8659 8664 5 9.30 9.30 Ipr_0290 pr_0290 pr_0280 8660 8664 5 9.11 9.11 Ipr_0298 pr_0298 pr_0290 8542 8547 5 9.78 9.78 Ipr_0300 pr_0300 pr_0298 8543 8548 5 10.00 10.00 Ipr_0308 pr_0308 pr_0300 8543 8549 5 10.36 10.36 Ipr_0310 pr_0310 pr_0308 8544 8549 5 10.54 10.54 Ipr_0320 pr_0320 pr_0310 8545 8550 5 10.40 10.41 Ipr_0322 pr -_0322 pr_0320 5472 5472 19.42 19.42 Ipr_0330 pr -_0330 pr_0320 8545 8550 5 10.59 10.59 Ipr_0338 pr_0338 pr 0330 8517 8522 5 11.12 11.13 Ipr_0340 pr_0340 or 0338 8517 8522 5 11.48 11.48 Ipr_0350 pr_0350 or 0340 8518 8523 5 11.87 11.88 Ipr_0360 pr_0360 pr_0350 8518 8523 5 13.26 13.27 Ipr_0370 pr_0370 pr_0360 8451 8456 5 14.07 14.07 Ipr_0380 pr_0380 pr_0370 8452 8457 5 14.67 14.67 Ipr_0390 pr_0390 pr_0380 7485 7491 6 15.60 15.60 Ipr_0400 pr_0400 pr_0390 6631 6638 6 15.81 15.82 Ipr_0410 pr_0410 pr 0400 60 60 21.97 21.97 Ipr_0420 pr_0420 pr 0400 6629 6635 6 16.10 16.10 Ipr_0430 pr_0430 pr 0420 6628 6634 6 16.31 16.32 Ipr_0440 pr_0440 pr_0430 6623 6629 6 18.31 18.32 Ipr_0445 pr_0445 pr 0440 6621 6627 6 18.67 18.68 Ipr_0448 pr_0448 pr_0445 6619 6625 6 18.80 18.80 Petaluma Ipr_0450 pr_0450 pr_0448 6617 6624 6 18.93 18.93 River Ipr_0452 pr_0452 pr 0450 6616 6622 6 19.03 19.03 Ipr_0458 pr_0458 pr 0452 6615 6622 6 19.21 19.22 Ipr_0460 pr_0460 pr 0458 6615 6622 6 19.30 19.30 Ipr_0465 pr_0465 pr 0460 6577 6584 7 19.47 19.48 Ipr_0470 pr_0470 pr 0465 6578 6584 7 19.56 19.56 Ipr_0480 pr_0480 pr 0470 6579 6586 7 19.82 19.82 Ipr_0490 pr_0490 pr 0480 6581 6588 7 20.25 20.25 Ipr_0496 pr_0496 pr_0490 6584 6591 7 20.3720.37 Ipr_0498 pr_0498 pr 0496 6586 6593 7 21.11 21.11 Ipr_0500 pr_0500 pr 0498 6587 6594 7 21.19 21.19 Ipr_0510 pr_0510 pr_0500 6589 6596 7 21.44 21.45 3 of 64 EXHIBIT 3 Capri Creek Terracing XP -Storm Results Summary - 50 -year Event Flooding Source Link ID U/S Node D/S Node Peak Discharge (cfs) U/S Node Water Surface Elevation Existing With Project Change' Existing With Project Change' Conditions Conditions Ipr_0520 pr_0520 pr_0510 6550 6557 7 22.06 22.06 Ipr_0530 pr_0530n pr_0520 6565 6572 8 22.76 22.77 Ipr_0540 pr_0540n pr_0530n 6575 6583 8 23.33 23.34 Ipr_0550 pr_0550 pr_0540n 5965 5970 5 24.09 24.09 Ipr_0552 pr_0552 pr 0550 5976 5982 5 24.19 24.20 3876.1 pr_0554 pr 0552 6384 6395 11 24.15 24.16 3876.2 pr_0554 pr_0552 -416 -422 6 24.15 24.16 Ipr_0560 pr_0560 pr_0554 5994 5999 5 24.67 24.68 Ipr_0570 pr_0570 pr_0560 5950 5952 2 25.17 25.18 Ipr_0580 pr_0580 pr_0570 5998 6000 2 25.94 25.94 Ipr_0590 pr_0590n pr_0580 5705 5704 27.71 27.71 Ipr_0600 pr_0600n pr_0590n 5901 5900 -1 28.10 28.10 Ipr_0606 pr_0606n pr_0600n 5822 5821 -1 28.77 28.77 2150.1 pr_0607n pr_0606n 5822 5821 -1 29.26 29.26 UWCorona pr_0607n pr 0606n 0 0 11.26 11.26 Ipr_0608 pr_0608n pr_0607n 5823 5821 -1 29.30 29.30 Ipr_0610 pr_061 On pr 0608n 4807 4806 29.71 29.71 Ipr_0612 pr_0612n pr 0610n 4802 4801 29.83 29.83 Ipr_0614 pr_0614n pr_0612n 4797 4796 30.04 30.03 Ipr_0616 pr_0616n pr_0614n 4770 4769 -1 30.14 30.14 Ipr_0618 pr_0618n pr_0616n 4767 4766 -1 30.30 30.30 Ipr_0620 pr_0620n pr_0618n 4765 4764 30.83 30.83 Ipr_0630 pr_0630n pr_0620n 4766 4765 31.62 31.62 Ipr_0640 pr_0640n pr_0630n 4767 4766 33.21 33.21 Ipr_0650 pr_0650 pr_0640n 4770 4769 33.24 33.24 Ipr_0660 pr_0660 pr 0650 4783 4783 33.29 33.29 Ipr_0670 pr_0670n pr 0660 4818 4811 -7 33.72 33.72 Ipr_0680 pr_0680n pr 0670n 4895 4859 -36 33.77 33.77 2792.1 pr_0682 pr 0680n 4629 4628 -1 34.01 34.01 682lob pr_0682 pr 0680n 695 693 -1 15.70 15.70 2791.1 pr_0684 pr_0682 4422 4421 -1 34.22 34.22 684lob pr_0684 pr_0682 1214 1206 -8 15.89 15.89 Ipr_0690 pr_0690n pr_0684 4847 4844 -3 34.16 34.16 Ipr_0700 pr_0700 pr_0690n 4866 4866 34.23 34.23 Ipr_0710 pr_0710 pr_0700 4887 4885 -2 35.42 35.42 Ipr_0720 pr_0720 or 0710 4817 4816 36.32 36.32 Ipr_0723 pr_0723 pr 0720 4802 4801 37.34 37.34 3663.1 pr_0725 pr 0723 3008 3007 -1 37.59 37.59 3663.2 pr_0725 pr 0723 3026 3027 37.59 37.59 Ipr_0730 pr_0730 pr_0725 4801 4801 37.74 37.74 1pr_G740 pr_0740 pr 0730 4825 4824 37.94 37.94 2526.1 pr_0745 pr 0740 3626 3626 38.45 38.45 2526.2 pr_0745 pr_0740 1199 1198 36.45 38.45 Ipr_0750 pr_0750 pr_0745 4825 4824 38.84 38.84 Ipr_0760 pr_0760 pr 0750 4825 4825 39.02 39.02 Notes: (1) Change due to project --negative values indicate a decrease, and positive values an increase. Differences in discharge less than 1 cfs and water surface elevation less than 0.01 feet are left blank. 4 of 65 EXHIBIT 3 Capri Creek Terracing XP -Storm Results Summary - 100 -year Event Flooding Source Link ID U/S Node D/S Node Peak Discharge (cfs) U/S Node Water Surface Elevation ExistingExisting With Project Change With Project Change Conditions Conditions LCaC_47.1 CaC_0047 cc_0040 115 115 30.10 30.08 -0.02 LCaC_47.2 CaC_0047 cc_0040 106 105 30.10 30.08 -0.02 LCaC7.3 CaC_0047 cc 0040 127 127 30.10 30.08 -0.02 UW_CaC0047 CaC_0047 CaC_TP30 -109 -107 -1 28.49 28.49 LCaC_350 CaC_0350 Ca0047 309 306 -2 30.21 30.19 -0.02 UW_cacL150 CaC_0350 CaC_L150 0 0 29.90 29.90 LCaC_584 CaC_0584 CaC_0350 310 308 -2 30.49 30.48 -0.01 LCaC_850.1 CaC_0850 CaC_0584 241 241 34.66 34.64 -0.01 Link1258 CaC_0850 CaC_1-10 0 0 34.66 34.64 -0.01 Linki262 CaC_0850 CaC_R10 249 240 -9 34.66 34.64 -0.01 UWCaC0850 CaC_0850 CapriStor 48 48 29.00 29.00 LCaC_1050 CaC_1050 CaC0850 493 481 -11 35.03 34.70 -0.33 LCaC_1250 CaC1250 CaC7_1050 493 482 -11 35.68 35.06 -0.61 LCaC_1450 CaC7_1450 CaC_1250 494 482 -12 36.49 35.79 -0.69 LCaC_1750 CaC_1750 CaC_1450 495 483 -13 38.24 37.34 -0.89 LCaC_1950 CAC_1950 CaC1750 496 483 -13 39.47 38.90 -0.57 LCaC_2150 CaC_2150 CAC7_1950 497 483 -14 40.40 40.26 -0.14 LCaC_2241 CaC_2241 CaC_2150 502 484 -18 41.44 41.43 -0.01 2350weir CaC_2350 CaC_2241 269 267 -1 36.94 36.94 1-CaC2350.1 CaC2350 CaC_2241 276 276 42.89 42.89 1-CaC_2850 CaC7_2850 CaC_2350 470 470 45.53 45.52 1-CaC_3250 CaC3250 CaC_2850 472 472 49.62 49.62 1-CaC_3650 CaC73650 CaC_3250 472 472 52.15 52.15 ICaC_3898 CaC73898 CaC_3650 472 472 53.70 53.70 LCa3900 CaC__3900 CaC_3898 473 473 54.53 54.53 LCaC4044.1 CaC4044 CaC_3900 276 276 56.07 56.07 UWCac4044 CaC__4044 CaC_3900 249 249 49.35 49.35 ICaC_4446 Ca4446 CaC_4044 431 431 56.03 56.03 ICaC_4448 CaC_4448 CaC_4446 431 431 57.03 57.03 LCaC_4450 CaC_4450 CaC_4448 431 431 58.46 58.46 ICaC_4846 CaC_4846 CaC_4450 432 432 58.90 58.90 ICaC_4848 CaC_4848 CaC_4846 432 432 60.19 60.19 LCaC_4850 CaC_4850 CaC_4848 432 432 62.16 62.16 Link1346 CaC_5171 CaC5171L10 14 14 66.05 66.05 Link1354 CaC_5171 CaC_4850 432 432 66.05 66.05 LCaC_5181 CaC_5181 CaC_5171 437 437 66.53 66.53 LCaC_554B CaC_5548 CaC_5181 443 443 68.32 68.32 LCaC_5902 CaC_5902 CaC_5548 462 462 75.39 75.39 LCaC_6105 CaC_6105 CaC_5902 463 463 78.93 78.93 ICaC_6200 CaC_6200 CaC_6105 463 463 84.62 84.62 Link1278 CaC_L02 CaC_L04 19 18 34.46 34.45 UW_cacl-04 CaC_L04 CaC_L20 8 8 34.00 34.00 UW_cacL130 CaC_L04 CaC_L130 9 9 34.00 34.00 Link1259 CaC_L10 CaC_L20 0 0 34.67 34.67 UW_cacl-110 CaC_L100 CaC_Li10 0 0 33.33 33.33 Link1447 CaC_L110 CaC_L160 0 0 33.35 33.35 Link1451 CaC_L120 CaC_L140 0 0 33.96 33.96 Link1455 CaC_L120 CaC_L110 0 0 33.96 33.96 Link -1452 CaC_L130 CaC_L150 9 9 34.14 34.14 Link -1454 CaC_L130 CaC_L120 0 0 34.14 34.14 Capri Link1449 CaC_L140 CaC_1-170 5 5 30.68 30.68 Creek 1-ink1453 CaCL150 CaC_L140 B 8 30.70 30.70 Link1448 CaC__L160 CaCL140 -6 -6 30.69 30.68 Link1450 CaC_L170 CaC7_0047 5 5 30.35 30.34 Link1260 CaC_L20 CaC_L30 1 1 34.20 34.20 UW cacl-50 CaC 1-20 CaC 1-50 5 5 33.65 33.65 I of M EXHIBIT 3 Capri Creek Terracing XP -Storm Results Summary -100-year Event 2 of4 67 Peak Discharge (cfs) U/S Node Water Surface Elevation Flooding Existing With Project Change' Existing With Project Change' Source Link ID UIS Node DIS Node Conditions Conditions Link1261 CaC_L30 CaC_L40 0 0 33.28 33.28 UW_cacl-40 CaC_L40 CaC_L100 0 0 33.60 33.60 Unk1440 CaC_1-50 CaC_1-60 0 0 34.18 34.18 Link1441 CaC_1-50 CaC_1-70 0 0 34.18 34.18 Link -1444 CaC_1-70 CaC_1-100 0 0 33.60 33.60 Link1263 CaC_R10 CaC_R20 249 240 -9 34.65 34.64 -0.01 Link1417 CaC_R700 CaC_R110 5 5 33.78 33.78 Link1438 CaC_R700 CaC_TP40 80 80 33.78 33.78 Link1418 CaC_R110 CaC_R190 2 2 33.32 33.32 Link1420 CaC_R110 CaC_R120 8 8 33.32 33.32 Link1421 CaC_R120 CaC_R150 8 8 30.37 30.37 Link1422 CaC_13150 CaC_R160 8 8 29.40 29.40 Link1423 CaC_13160 CaC_R180 8 7 28.24 28.23 Link1424 CaC_R180 CaC_R200 1 1 28.24 28.23 Link1428 CaC_R190 CaC_R180 2 2 33.08 33.08 Link1264 CaC_R20 CaC_R30 28 30 2 34.62 34.62 Link1267 CaC_R20 CaC_R60 228 224 -4 34.62 34.62 Link1269 CaC_R20 CaC_R80 20 21 1 34.62 34.62 Link1425 CaC_R200 CaC_R210 0 0 28.24 28.23 Link1265 CaC_R30 CaC_R40 15 14 34.63 34.62 Link1266 CaC_R40 CaC_R50 12 12 34.63 34.63 Link1415 CaC_R50 CaC_R52 9 10 34.64 34.64 Link1416 CaC_R52 CaC_R54 0 0 34.65 34.65 Link1268 CaC_R60 CaC_R70 227 224 -3 34.62 34.62 CaC_R70 CaC_TP10 113 112 -2 33.70 33.70 Link1271 CaC_R70 CaC_R72 94 93 34.55 34.55 Link1277 CaC_R70 CaC_1-02 19 19 34.55 34.55 UW_cacR70 CaC_R70 CaC_TP10 113 112 -2 33.70 33.70 Link -1272 CaC_R72 CaC_R74 8 9 34.21 34.21 UW_cacR72 CaC_R72 CaC_R100 100 100 33.40 33.40 Link1273 CaC_R74 CaC_R76 6 6 34.20 34.20 UW_cacR76 CaC_R76 CaC_R110 6 6 33.00 33.00 Link1270 CaC_R80 CaC_R90 5 5 34.63 34.62 Link1274 CaC_R90 CaC_R92 0 0 34.63 34.62 Linki279 CaC_TP10 CaC_TP15 112 111 -1 34.12 34.12 Link -1286 CaC_TP15 CaC_TP20 70 70 31.31 31.31 Link1287 CaC_TP15 CaC_TP40 42 42 31.31 31.31 Link -1280 CaC_TP20 CaC_TP30 70 69 30.75 30.74 Link1295 CaC_TP30 CaC_TP50 -63 -62 -1 30.31 30.31 Link1288 CaC_TP40 CaC_TP50 121 121 30.33 30.33 Link1289 CaC_TP50 CaC_TP70 51 55 4 30.32 30.31 Link1292 CaC_TP70 CaC_TP80 42 42 30.32 30.31 UW_cacTP70 CaC_TP70 CaC_R730 -753 -753 30.35 30.35 Link1293 CaC_TP80 CaC_TP90 41 41 30.22 30.21 Link1439 CaC_TP90 pr_0510 40 39 28.90 28.89 Ipr_0020 pr_0020 pr_0010 11912 11907 -5 6.53 6.53 Ipr_0030 pr_0030 pr_0020 11912 11907 -5 6.66 6.66 Ipr_0040 pr_0040 pr_0030 11912 11907 -5 6.77 6.77 Ipr_0050 pr_0050 pr_0040 10865 10865 6.98 6.98 Ipr_0060 pr_0060 pr 0050 10858 10858 7.07 7.07 Ipr_0070 pr_0070 pr_0060 10857 10857 7.38 7.38 Ipr_0080 pr_0080 pr_0070 10856 10856 7.48 7.48 Ipr_0090 pr_0090 pr_0080 10855 10855 7.81 7.81 Ipr_0100 pr_0094 pr_0090 10491 10491 7.85 7.85 Link1230 pr 0096 pr_0094 10492 10492 8.10 8.10 Link -1229 pr 0098 pr_0096 10492 10492 8.19 8.19 2 of4 67 EXHIBIT 3 Capri Creek Terracing XP -Storm Results Summary - 100 -year Event Flooding Source Link ID U/S Node D/S Node Peak Discharge (cfs) U/5 Node Water Surface Elevation Existing With Project Change' Existing With Project Change' Conditions Conditions Link -1228 pr 0100 pr_0098 10492 10493 8.27 8.27 Ipr_0110 pr_ot 10 pr_0100 10473 10473 8.38 8.38 Ipr_0120 pr_0120 for 0110 10474 10474 8.38 8.38 Ipr_0130 pr_0130 pr_0120 10475 10475 8.47 8.47 Ipr_0140 pr_0140 pr_0130 10476 10476 8.56 8.56 Ipr_0150 pr_0150 pr_0140 10477 10477 8.71 8.71 Ipr_0160 pr_0160 pr_0150 10338 10338 8.92 8.92 Ipr_0170 pr_0170 pr 0160 10340 10341 9.02 9.02 Ipr_0180 pr_0180 pr 0170 10326 10327 9.11 9.11 Ipr_0190 pr_0190 pr 0180 10328 10328 9.19 9.19 Ipr_0195 pr_0195 pr 0190 10329 10329 9.44 9.44 Ipr 0200 pr_0200 pr 0195 9998 9998 9.60 9.60 Link1239 pr_0206 pr_0200 9978 9978 9.63 9.63 Ipr_0208 pr_0208 pr_0206 9978 9978 9.86 9.86 Ipr_0210 pr_0210 pr_0208 9970 9980 9.89 9.89 Ipr_0220 pr_0220 pr_0210 9969 9970 10.06 10.06 Ipr_0230 pr_0230 pr_0220 9971 9972 10.09 10.09 Ipr_0240 pr_0240 pr_0230 9974 9976 1 10.09 10.09 Ipr_0250 pr_0250 pr_0240 9976 9977 10.09 10.09 Ipr_0260 pr_0260 pr 0250 9978 9979 1 10.10 10.10 Ipr_0270 pr_0270 pr 0260 9979 9979 10.12 10.12 Ipr_0280 pr_0280 pr 0270 9980 9980 10.14 10.14 Ipr_0290 pr_0290 pr 0280 9981 9981 9.93 9.93 Ipr_0298 pr_0298 pr 0290 9852 9852 10.64 10.64 Ipr_0300 pr_0300 pr 0298 9852 9853 10.87 10.87 Ipr_0308 pr_0308 pr_0300 9854 9855 11.27 11.27 Ipr_0310 pr_0310 pr_0308 9856 9856 11.45 11.45 Ipr_0320 pr_0320 pr_0310 9856 9857 11.30 11.30 pr 0322 pr_0322 pr 0320 5472 5472 19.42 19.42 Ipr_0330 pr_0330 pr_0320 9857 9857 11.49 11.49 Ipr_0338 pr_0338 pr_0330 9826 9826 12.04 12.04 Ipr_0340 pr_0340 pr_0338 9826 9827 12.41 12.41 Ipr_0350 pr_0350 pr_0340 9827 9827 12.80 12.80 Ipr_0360 pr_0360 pr_0350 9828 9829 14.19 14.19 Ipr_0370 pr_0370 pr 0360 9754 9755 15.02 15.02 Ipr_0380 pr_0380 pr_0370 9755 9755 15.64 15.64 Ipr_0390 pr_0390 pr_0380 8668 8669 1 16.52 16.52 Ipr_0400 pr_0400 pr_0390 7768 7770 2 16.76 16.76 Ipr_0410 pr_0410 pr_0400 60 60 21.97 21.97 Ipr_0420 pr_0420 pr_0400 7766 7768 2 17.08 17.08 Ipr_0430 pr_0430 pr_0420 7765 7767 2 17.32 17.32 Ipr_0440 pr_0440 pr 0430 7761 7763 2 19.02 19.02 Ipr_0445 pr_0445 pr 0440 7758 7760 2 19.40 19.40 Ipr_0448 pr_0448 pr_0445 7756 7758 2 19.53 19.53 Petaluma Ipr_0450 pr_0450 pr_0448 7755 7757 2 19.64 19.64 River Ipr_0452 pr_0452 pr_0450 7755 7757 2 19.73 19.73 Ipr_0458 pr_0458 pr_0452 7757 7759 2 19.93 19.94 Ipr_0460 pr_0460 pr_0458 7759 7761 2 20.02 20.02 Ipr_0465 pr_0465 pr_0460 7719 7721 2 20.20 20.20 Ipr_0470 pr_0470 pr_0465 7721 7724 2 20.28 2028 Ipr_0480 pr_0480 pr_0470 7725 7727 2 20.55 20.55 Ipr_0490 pr_0490 pr_0480 77307732 2 20.93 20.93 Ipr_0496 pr_0496 pr_0490 7735 7737 2 21.05 21.05 Ipr0498 _ pr_0498 pr_0496 7737 7740 2 21.92 21.92 Ipr_0500 pr_0500 pr_0498 7738 7740 2 22.00 22.01 Ipr_0510 pr_0510 pr_0500 7742 7744 2 22.25 22.25 3 of4 W. EXHIBIT 3 Capri Creek Terracing XP -Storrs Results Summary - 100 -year Event Flooding Source Link ID U/S Node DIS Node Peak Discharge (cfs) U/S Node Water Surface Elevation Existing With Project Change Existing Wth Project Change Conditions Conditions Ipr_0520 pr_0520 pr_0510 7700 7702 2 22.74 22.74 Ipr_0530 pr_0530n pr_0520 7715 7718 2 23.44 23.44 Ipr_0540 pr_0540n pr_0530n 7724 7727 2 24.02 24.02 Ipr_0550 pr_0550 pr_0540n 7062 7063 1 25.13 25.13 Ipr_0552 pr_0552 pr 0550 7078 7079 1 25.25 25.25 3876.1 pr_0554 pr_0552 7179 7178 25.27 25.27 3876.2 pr_0554 pr_0552 1151 1157 6 25.27 25.27 Ipr_0560 pr_0560 pr_0554 7109 7111 2 25.60 25.60 Ipr_0570 pr_0570 pr_0560 6826 6826 25.92 25.92 Ipr_0580 pr_0580 pr_0570 6871 6871 26.44 26.44 Ipr_0590 pr_0590n pr_0580 6461 6460 28.04 28.04 Ipr_0600 pr_O600n pr_0590n 6503 6502 28.38 28.38 Ipr_0606 pr_0606n pr_0600n 6406 6406 29.01 29.01 2150.1 pr_0607n pr_0606n 6403 6403 29.62 29.62 UWCorona pr_0607n pr_0606n 0 0 11.26 11.26 Ipr_0608 pr_0608n pr_0607n 6403 6403 29.67 29.67 Ipr_0610 pr 0610n pr_0608n 5325 5324 30.04 30.04 Ipr_0612 pr 0612n pr_061 On 5319 5319 30.15 30.15 Ipr_0614 pr_0614n pr_0612n 5314 5314 30.38 30.38 Ipr_0616 pr_0616n pr_0614n 5284 5284 30.48 30.48 Ipr_0618 pr_0618n pr 0616n 5281 5280 30.62 30.62 Ipr_0620 pr_0620n pr 0618n 5279 5279 31.11 31.11 Ipr_0630 pr_0630n pr 0620n 5280 5280 31.89 31.89 Ipr_0640 pr_0640n pr_0630n 5271 5271 33.57 33.57 Ipr_0650 pr_0650 pr_0640n 5274 5273 33.60 33.60 Ipr_0660 pr_0660 pr_0650 5285 5285 33.64 33.64 Ipr_0670 pr_0670n pr_0660 5303 5302 34.05 34.05 Ipr_0680 pr_0680n pr_0670n 5304 5303 34.10 34.10 2792.1 pr_0682 pr_0680n 4788 4790 2 34.31 34.31 682lob pr 0682 or 06130n 1447 1447 15.70 15.70 2791.1 pr 0684 or 0682 4528 4528 34.49 34.49 684lob pr 0684 pr 0682 1973 1972 15.89 15.89 Ipr_0690 pr 0690n pr 0684 5371 5371 34.43 34.43 Ipr_0700 pr_0700 pr_0690n 5386 5385 34.50 34.50 Ipr_0710 pr_0710 pr_0700 5401 5401 35.48 35.48 Ipr_0720 pr_0720 pr_0710 5369 5368 36.46 36.46 Ipr_0723 pr_0723 pr_0720 5374 5374 37.42 37.42 3663.1 pr 0725 pr_0723 3767 3767 37.62 37.62 3663.2 pr 0725 pr 0723 3026 3026 37.62 37.62 Ipr_0730 pr_0730 pr 0725 5374 5374 37.78 37.78 Ipr_0740 pr_0740 pr 0730 5359 5359 38.01 38.01 2526.1 pr_0745 pr_0740 37591 3759 38.62 38.62 2526.2 pr_0745 pr_0740 15991 1599 38.62 38.62 Ipr_0750 pr_0750 pr_0745 5359 5358 39.09 39.09 Ipr_0760 pr 0760 pr 0750 5360 5359 -1 39.28 39.28 Notes: (1) Change due to project --negative values indicate a decrease, and positive values an increase. Differences in discharge less than 1 cfs and water surface elevation less than 0.01 feet are left blank. 4 of Me