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RMC Geoscience,Inc. 405 East b Street, Suite 409 <br /> Engineering Geology Petaluma,California 94952 <br /> Environmental Geoscience Phone: 415 699-8073•Fax: 707 765-1924 <br /> March 9, 2010 U (r EVED <br /> E " <br /> Shadow Lake Mobile Home Community <br /> MAR 16 2010 <br /> 5100 North Highway 99 ENVIRONMENT HEALTH <br /> Stockton, California 95212 EERMITISERVICES <br /> Subject: Quarterly Groundwater Monitoring Report,Shadow Lake Mobile Home Community <br /> This letter report presents the results of the fourth quarter 2009 quarterly groundwater sampling and <br /> analysis event at the Shadow Lake Mobile Home Community, located in Stockton, California. <br /> Groundwater sampling and analytical procedures were performed in general accordance with the <br /> procedures described in the March 2001 Groundwater Monitoring and Seepage Pit Infiltration <br /> Capacity Workplan that was prepared by RMC Geoscience, Inc. for Wastewater Solutions <br /> International and Shadow Lake LLC. <br /> FACILITY LOCATION AND DESCRIPTION <br /> The Shadow Lake mobile home community is located at 5100 North Highway 99 in Stockton, <br /> California in Section 51,T2N,R6E of the Mount Diablo Baseline and Meridian as shown in Figure <br /> 1. The Calaveras River is located approximately 500 feet south of the site and surrounding land uses <br /> are primarily residential and agricultural. <br /> The mobile home community includes about 256 mobile homes and two clubhouses with kitchens. <br /> Sewage and wastewater from the residential sites and clubhouses are conveyed through a gravity <br /> collection system to an onsite activated sludge treatment plant. Effluent from the treatment plant <br /> is discharged to a polishing pond and then through a sand filter prior to discharge to a second <br /> polishing pond. Effluent from the second pond is discharged by gravity and flows to a series of <br /> seepage pits for disposal. Daily peak flows from the treatment plaint are absorbed by the ponds so <br /> that flow to the seepage gallery is relatively constant. <br /> The seepage pits are valved in eight groups of three pits per valve(i.e.,a single valve controls flow <br /> to each group of three pits). The seepage pits are located along the western edge of the property line <br /> adjacent to the Highway 99 frontage road(Figure 2). The seepage pits are 60 inches in diameter and <br /> 25 feet deep and are located approximately 12 feet apart(center-to-center). Seepage pit numbers <br /> c:u,_rro��s�ow�wsor,��wQzoo9xyon+aQzoo9x�c�a <br />