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RMC Geoscience,Inc. 405 East D Street, Suite 109 <br /> Engineering Geology Petaluma,California 94952 <br /> Environmental Geoscience Phone: 415)699-8073• Fax: (707)765-1924 <br /> April 13, 2009 <br /> RE;��� � <br /> APR 2 12009 <br /> Shadow:Lake Mobile Home Community WIRONMFNT HFJM <br /> 5100 North Highway 99 PERMIT/SFRMF <br /> Stockton, California 95212 <br /> i <br /> Subject: Quarterly Groundwater Monitoring Report,Shadow Lake Mobile Home Community <br /> This letter report presents the results of the first 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 /> i <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 /> I <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 plant 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 /> } <br /> { C:Iq_Projects45hadoalake%MonitoringReportsl1 Q2009Repnri4I Q2009Reporrt-,cpd <br /> ' I <br />