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3.PROJECT DESCRIPTION MOUNTAIN HOUSE NEIGHBORHOODS KAND L INITIAL STUDY consistent with existing plans and agreements. Storm drainage from the Neighborhoods K and L area would flow into existing drainage facilities that include Mountain House Creek and a water quality basin. These facilities have been designed in accordance with storm drainage Best Management Practices (BMPs). �} Portions of Neighborhoods K and L are in a Federal Emergency Management Agency(FEMA) 100-year flood zone but would be re-mapped outside the 100- year flood zone when the site elevation is raised as part the development allowed by the project. Subsequently,the FEMA 100-year floodplain map would be amended. In 2007,the State of California passed Senate Bill 5,which requires 200-year flood protection for urban or urbanizing areas. As part of the Senate Bill 5 process,the Department of Water Resources released preliminary maps that indicate portions of the project site are within the 200-year floodplain. While the State has not yet determined the official 200-year floodplain elevation,flood protection would be provided in the same manner in which 100-year flood protection is being provided, by raising the elevation through fill. The amount of fill to needed raise portions of Neighborhoods K and L above the FEMA 100-year flood elevation of 10.4 feet is approximately 2 million cubic yards. The fill material would come from the site during the excavation of the lakes and cut from the higher elevation portions of the site. Not all of the site would require fill. The portions closest to Old River are the lowest, at an elevation of 5 feet,and would be raised a minimum 5.4 feet to be removed from the FEMA 100-year floodplain. The southern portions of Neighborhoods K and L are already above the floodplain and would not require any fill. Water Lines and Agricultural Irrigation The MHCSD would provide domestic water to the project and has provided a Will Serve Letter to the applicant. The MHCSD water treatment plant is located on the north side of Byron Road west of the project site. The applicant would construct all of the required water facilities. The BBID, under contractual relations with the MHCSD, is providing raw water supply to the MHCSD. Facilities anticipated to be constructed by the applicant to provide water service to Neighborhoods K and L include the balance of backbone water facilities on the applicant's lands, consistent with the MHCSD adopted Water Service Master Plan. However,specific requirements would be determined by the MHCSD as part of subsequent engineering design and approvals. Several applicant-owned farm irrigation facilities currently exist on the project site.They include irrigation and drainage pipelines and ditches. Irrigation facilities would be removed during development. Improvement plans would be reviewed by the MHCSD. Additional detailed information regarding farm irrigation is included in the Neighborhood K and L Farm Irrigation and Drainage Reports completed by Condor in 2010(Condor, 2010) and is addressed in Section 5.8, Hydrology and Water Quality, of this Initial Study. cue rn 3-14