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€ <br /> € RMC Geoscience; Inc. <br /> Shadow Lake Mobile Home Community <br /> March 9,2010 <br /> l Page 2 <br /> i d <br /> M <br /> N <br /> l through 18(the pits are numbered from north to south)include a 6-inch-diameter perforated PVC <br /> pipe positioned in the center of the pit, with the remainder of each pit backfilled with gravel. <br /> Seepage pit numbers 19 through 24 are rel itively newer than pits 1 through 18 and include an fl- <br /> inch-diameter perforated PVC pipe in the c nter of the pit. <br /> GEOLOGIC CONDITIONS <br /> 3 <br /> The Shadow Lake facility is located in the Central Valley and is protected from a 100 year flood by <br /> levees along the Calaveras River(the levees are maintained by the San Joaquin Area Flood Control <br /> District). The geology of the area is characterized by alluvial deposits from the',Sierra Nevada and <br /> Coastal mountain ranges that border the Central Valley. Soil borings advanced as part ofmonitoring <br /> well installation at the site indicated similar lithology at each of the soil boring locations. In general, <br /> the subsurface soils encountered between 10 and 70 feet below the ground suiface are relatively <br /> uniform and consist of ight brown to brown fine-grained silty sand and sandy silt: Silty sand appear <br /> to be the predominant soil type based on the samples recovered from the borings. Bedding was not f <br /> observed in any of the samples that were recovered and individual soil type horizons(silty sand and <br /> sandy silt)could not be correlated between the borings. Groundwater was encountered about 62 to <br /> 63 feet below the ground surface during.soil boring and well installation activities. <br /> GROUNDWATER MONITORING NETWORK : <br /> The groundwater monitoring system at the Shadow Lake Mobile Home Community includes the <br /> three monitoring wells(MW-1 through MW-3)shown in Figure 2. These wells are constructed of <br /> !, 2-inch diameter PVC and screen the upper 10 feet of first encountered groundwater. The wells were <br /> completed at the ground surface with an at-grade Christy box. Surveyed ground surface and <br /> groundwater elevation reference elevations are shown in Table 1. As indicated in Table lc,well <br /> MW-3 had been damaged and was repaired during the September 22,2005 monitoring event. <br /> C:% ptojectsLShadowl ke%iaxutonngRepofWAQ2009Repart4Q2pp9ReporLwpd <br />