Reso PC15-01 PC Reso (3051 ) to Adopt Initial Study-Mitigated Negative Declaration - La Palma

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3.0 Environmental Impact Checklist have inadequate capacity to serve the project and upgrades to the water and wastewater mains would be required.Mitigation Measures UTIL-1 and UTIL-2 would require an assessment of the existing water and wastewater mains to ensure adequate capacity to service the project and require the applicant to upgrade the mains as necessary. Mitigation Measure UTIL-1:Prior to the issuance of Grading and Encroachment Permits,the applicant shall prepare a Water System Study of the existing 6-inch water main in Kentfield Avenue to determine if the existing flow and pressure are adequate to serve domestic needs and fire flow requirements of the proposed project.If the Water System Study determines the existing water main is inadequate to service the project, the applicant shall upgrade the water main to provide adequate flow and pressure to serve the project. The Water System Study and the proposed upgrade in size of the water main shall be submitted to Engineering and Transportation Services for review and approval. Mitigation Measure UTIL-2:Prior to the issuance of Grading and Encroachment Permits,the applicant shall prepare a Wastewater System Study of the existing 6-inch wastewater main in Kentfield Avenue to determine if there is adequate capacity to serve the project. The Wastewater System Study shall account for the additional wastewater flow created by the project and the contribution to Inflow and Infiltration(III). If the Wastewater System Study determines the existing wastewater main is inadequate to service the project, the applicant shall upgrade a specified Iength of the wastewater main to provide adequate capacity to serve the project or pay an established in-lieu fee.The Wastewater System Study and the proposed upgrade in size of the wastewater main shall be submitted to Engineering and Transportation Services for review and approval. With implementation of Mitigation Measure UTIL-1 and UTIL-2,impacts to the City's water distribution and wastewater collection systems would be less than significant. c) Require or result in the construction of new stormwater drainage facilities or expansion of existing facilities,the construction of which could cause significant environmental effects? Less-than-Significant Impact with Mitigation Incorporated.As discussed in Section 3.9, Hydrology and Water Quality, the project would increase the amount of impervious surface on the project site, which would increase the amount of stormwater flows from the project site. Replacement of the three existing residential structures and driveways on-site with 12 single- family homes and walkways areas would increase the amount of impervious surface on the project site by approximately 13,409 square feet of impervious surfaces on the project site. The City requires the limiting of post-development discharge to equal or less than pre- development discharge. In the event of a 10-year storm,current runoff rate of the project site is 0.9 cubic feet per second (cfs) and the post-construction runoff rate of the project site with implementation of the project would be 0.98 cfs,representing a nominal net change of 0.08 cfs. To address the increase in runoff,the project would incorporate an on-site detention system and metering device to minimize the increased runoff due to additional impervious areas in accordance with Mitigation Measure HYD-3. As part of the project, approximately 500 feet of storm drain pipe and associated storm drain structures would be installed within Kentfield Avenue to connect to the City's existing storm drain system. Mitigation Measure HYD-4 would La Palma Subdivision Project Final Initial Study/Mitigated Negative Declaration 62