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HomeMy WebLinkAboutPlanning Commission Resolution 2014-23 07/22/2014RESOLUTION NO. 2014-23 CITY OF PETALUMA PLANNING COMMISSION RESOLUTION OF THE CITY OF PETALUMA PLANNING COMMISSION RECOMMENDING CITY COUNCIL APPROVAL OF CONSTRUCTION OF A DETENTION BASIN ON CITY LANDS EAST OF RIESLING ROAD BETWEEN CORONA CREEK SCHOOL AND KENILWORTH JUNIOR HIGH SCHOOL 0 Riesling Road APN 137-070-049 Project File No: 09 -TSM -0344 WHEREAS, the applicant, Corona Road Associates, L.C.C., submitted an application for a Tentative Subdivision Map for a 31 -lot residential subdivision to be comprised of the existing house at 498 Corona Road remaining at its current location and the creation of 30 new vacant residential lots, along with associated requests for Annexation and Pre -Zoning; and WHEREAS, the Flood Insurance Rate Map (FIRM) revisions were finalized by the Federal Emergency Management Agency (FEMA), and adopted in February of 2014 and show most of the proposed annexation area within the 100 -year floodplain for nearby Corona Creek; and WHEREAS, to address the 2014 Flood Insurance Rate Map showing the annexation area and surrounding area, the applicant proposes a detention basin at open field abutting Corona Creek, upstream of the project site, northeast of Riesling Road on approximately ±4.6 acres of Urban Separator lands between Corona Creek (northwest of Kenilworth Junior High) and the ball field of the Corona Creek Elementary School; inside the City limits and at the UGB line; and WHEREAS, the detention basin proposal and design have been fully analyzed on behalf of the City by water engineering consultants, and found to successfully remove the subdivision and annexation and adjacent existing houses to the east and south from the 100 -year flood plain; and WHEREAS, the Initial Study/MND concludes that the proposed detention basin together with Mitigation Measures HYDRO 2 through 4 (agreed to by Corona Road Associates, L.C.C.) ensures that flood risks are reduced to levels below significance; and WHEREAS City Engineer and the Water Division have reviewed the proposal, accept it, and find that it will remove housing from the flood hazard associated with the 10 year and 100 year flood; and WHEREAS, after public review and input at duly noticed public hearings on January 28 and July 22, 2014, the Planning Commission of the City of Petaluma adopted Resolutions recommending adoption of the Mitigated Negative Declaration, support of Annexation, Pre - Zoning the Annexation lands in the manner consistent with the General Plan designation, designation of the house at 498 Corona Road as a local landmark, and Tentative Subdivision Map approval of 10.1 acres into a 31-1ot subdivision, all relating to the Corona Road Annexation and Subdivision project; and WHEREAS, at the January 28 and July 22, 2014 public hearings, the Planning Commission also received public comment and considered the proposed detention basin on City lands in the Urban Separator east of Riesling Road. Planning Commission Resolution No. 2014-23 Page 1 NOW, THEREFORE, BE IT RESOLVED that the Planning Commission hereby recommends the City Council authorize construction of the detention basin, as modified by the project Mitigation Measures and Conditions of Tentative Subdivision Map approval, based on the based on the following findings: The addition of the basin does not significantly change the use of the urban separator or prohibit residents from venturing out into the urban separator lands. 2. Location of the detention basin is consistent with the Corona Ely Specific Plan which designates that the urban separator serve the purpose of preserving views to Sonoma Mountain and serving as a barrier between residential uses and those occurring on County lands (such as agricultural uses). With the basin addition, the urban separator lands will continue to serve as a separator between residential uses and those occurring on County lands and existing views to Sonoma Mountain will remain as the detention basin is an excavation rather than projection. 3. Location of the detention basin is consistent with the Corona Ely Specific Plan which designates that the urban separator be passive open space and be 300 feet in depth. With construction of a detention basin, the subject urban separator segment will continue to serve as passive open space and be 300 feet in depth. As in the current condition, particularly as now designed with 5:1 slopes; nothing prevents residents from venturing out into the urban separator lands. 4. There is a precedent for detention basins in the urban separator lands; there is one in the Heritage Subdivision urban separator (between Lansdowne Way and Westminster Lane) and three in the Shelter Hills Subdivision urban separator (at St Augustine Circle). 5. The proposed Corona Subdivision with the Riesling Road detention basin replaces the lost floodplain storage due to build out of the proposed Corona Subdivision and reduces water surface elevations below existing elevations at the project site 6. Construction of the detention basin within the City's Urban Separator will provide the following benefits to the greater public good: a. The proposed detention basin will provide excess water storage capacity during the 100 -year storm event. This will reduce the downstream water surface elevation below existing elevations and reduce the overflow potential of Corona Creek; b. Existing surrounding homes that the new FIRM map shows as being located within the 100 year event flood zone will be removed and will not be required to have Flood insurance; c. The 100 -year water surface elevation will be reduced in Corona Creek by an average of about 0.5 feet; d. The 100 -year water surface elevation will be reduced in the Petaluma River by an average of about 0.01 feet; e. The project will construct the urban separator streetscope improvements which did not occur with build -out of the Graystone Creek subdivision. As required by the Corona Ely Specific Plan including Policies 124 and 125, the project will construct a 25 -foot wide, Urban Separator edge improvement, along the frontage of Riesling Road. Commencing at Riesling Road, the Urban Separator edge improvement will consist of a 6 foot landscape strip, an 8 foot multi -use concrete path, an 11 foot landscape strip, and a 3 foot high open -type vehicle barricade at the top of the detention basin bank. Planning Commission Resolution No. 2014-23 Page 2 ADOPTED this 22nd day of July, 2014, by the following vote: Commission Member Aye No Absent Abstain Benedetti- Petnic X Lin X Gomez X Marzo X Councilmember Miller X Vice Chair Pierre X Chair Wolpert X ATTEST: H61ather Hines, C0 -mission Secretary Bi I Wolpert, Chair APPROVED AS TO FORM: 1 Eric W. Danly, City Attorne Planning Commission Resolution No. 2014-23 Page 3