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} <br /> RMC Geoscience,Inc. <br /> Engineering Geolo_ 405 East D Street, Suite 109 <br /> EnVLOnmental Geoscience Petaluma,Califomia 94952 <br /> Phone; 15)699-$073• Fax.-(707)765-1924 <br /> 1 <br /> April 16, 20I0 <br /> qp <br /> Shadow Lake Mobile Home Community <br /> a <br /> 5100N <br /> North Highway 99 <br /> Stockton, California 95212 <br /> S <br /> Subject: Quarterly Groundwater Monitoring Report,Shadow Lake Mobile Home Community <br /> This letter report presents the results of the first quarter 2010 quarterly groundwater sampling and 1 <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 />.. F <br /> a. 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 ofthe site and surrounding land uses <br /> are primarily residential and agricultural. <br /> F <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 /> t <br /> polishing pond. Effluent from the second pond is discharged b <br /> � seepage pits for dis osal. Dail g Y gravity and flows to a series of <br /> p y 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 g 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 /> 1. 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 I2 feet apart(center-to-center). Seepage pit numbers ' <br /> f C:L4_Pr01ccatSWOw[ake4lv[miLonngReponsll Q2010RepoTtQ Q2010Repaa.wpd - <br /> I <br />