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E MOUNTAIN HOUSE NEIGHBORHOODS K ANO L INITIAL STUDY 5.ENVIRONMENTAL CHECKLIST $.HYDROLOGY AND WATER QUALITY J Pacific Advanced Civil Engineering (PACE), Inc., December 2005. Conditional Letter of Map Revision Based on Fill, Mountain House between Byron Road and Old River. .. Condor Earth Technologies, October 2010. Fara Irrigation Report, Neighborhoods K and L, Mountain House, California. Y All of these studies can be reviewed at the San Joaquin County Community Development Department. Removal of Farmland Irrigation Infrastructure As described above, Neighborhoods K and L were historically irrigated by water from Old River via a series of irrigation pumps, pipes, and ditches. The proposed development of Neighborhoods K and L would require the abandonment and removal of all irrigation infrastructure within these two neighborhoods. A Farm �. Irrigation Report has been prepared for Neighborhoods K and L(Condor,2010). Farm Irrigation Reports must be submitted to and approved by San Joaquin County Community Development with each Tentative Subdivision Map. ' Storm Water Master Plan Update The Mountain House Storm Water Master Plan Addendum II (PACE, 2006) presents the results of HEC-1 modeling conducted for Mountain House and forms the basis for the updated conceptual drainage improvements associated with the development of Neighborhoods K and L. Drainage-related improvements proposed for Neighborhoods K and L include primary and secondary storm drain systems, Old River levee improvements, and permanent lake features. These drainage improvements would be built as needed based on the phased construction of Neighborhoods K and L. Certain elements of the drainage infrastructure for Neighborhoods K and L have already been constructed as part of prior development projects in the Mountain House community(i.e.,Water Quality Basin No. 1 and the Mountain House Creek restoration). Primary Storm Drain System I The primary storm drainage system would provide conveyance of all off-site i F runoff and on-site runoff and would include trunk storm drain pipes(72-inch- diameterand larger), open channels, and lakes. Pipes and open channels would be designed for the 100-year flood capacity to the point of terminal discharge at z w Old River. r; Secondary Storm Drain System w The secondary storm drainage system would be located within the local and collector streets and would consist of gutters, local drainage swales, minor channels, catch basins,catch basin laterals, and smaller storm drain pipes (smaller than 72-inch-diameter). This system would transport on-site drainage to r, trunk lines and lake features. i ;grim} 5-147 f � 1