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5.ENVIRONMENTAL CHECKLIST MOUNTAIN HOUSE NEIGHBORHOODS K AND L INITIAL STUDY 16.UTILITIES AND SERVICE SYSTEMS ■ Sanitary sewer systems to serve Neighborhoods E, F, G, H, and the Delta Community College South Campus area south of Grant Line Road (Groover, 2011). A 5.4-mgd average annual flow WWTP would be necessary to treat the sewage generated by the Mountain House community at buildout. An Initial Study was prepared for the 5.4-mgd WWTP to address all the potential environmental impacts associated with construction of the WWTP at full capacity(SJCCDD, 1998). In 1998, San Joaquin County issued a Use Permit for the WWTP. The WWTP is currently operated under waste discharge requirements issued by the Central Valley Regional Water Quality Control Board(RWQCB). Treated effluent from the WWTP was previously disposed by means of flooding2 on approximately 200 acres of land located north of Byron Road within the project site between the months of April and November. The land,owned by Shea Mountain House LLC, included an easement for the MHCSD to use this area for land disposal. Land disposal was prohibited during the rainy season from November to March;thus,two 60-million-gallon treated effluent storage ponds were constructed between the WWTP and the land disposal area to hold the effluent until land disposal can recommence. These ponds still exist but are empty and no longer used since the MHCSD received approval to dispose of all treated wastewater via an outfall to Old River at the northern end of Neighborhood L. Any sludge generated from the WWTP was originally to be disposed at Forward, Inc., a Class II landfill within San Joaquin County,or transported outside the county for disposal (Karam,2006). Recently, however, sludge has been sold to cotton farmers to use as fertilizer(Groover, 2011). Storm Drainage The sites for Neighborhoods K and L were formerly used almost entirely for agriculture, so an urban storm drain system did not exist in these areas. Mountain House Creek traverses the boundary between Neighborhoods K and L. Mountain House Creek flows in natural and man-made earthen channels. Existing drainage of lands on both sides of the creek consists of ditches and agricultural drains that discharge into the creek. Refer to Section 5.8, Hydrology and Water Quality,for more discussion of drainage and water quality control features. Solid Waste Very little solid waste was generated at the Neighborhoods K and L project site, which was formerly agricultural land. There was no urban solid waste (garbage) 2 Flooding refers to allowing treated effluent to flow out onto the surface of the ground through valves on pipelines as opposed to spraying the effluent into the air through turf spray or sprinkler systems. (Will) 5-196