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{ <br /> RMC Geoscience, Inc. I <br /> Shadow Lake Mobile Home Community <br /> July 27, 2010 <br /> 3 Page 2 <br /> i I <br /> I <br /> 1 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 relatively newer than pits 1 through 18 and include an 8- <br /> inch-diameter perforated PVC pipe in the center of the pit. <br /> I <br /> GEOLOGIC CONDITIONS <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 of monitoring <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 surface are relatively <br /> r. uniform and consist of light 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 <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 /> k The groundwater monitoring system at the Shadow Lake Mobile Home Community includes the <br /> k. 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 1 c, well <br /> MW-3 had been damaged and was.repaired during the September 22, 2005 monitoring event. <br /> However, the reference point for this well has not be re-surveyed and groundwater elevations <br /> s reported for this well are uncertain. <br /> C,1A_Projemt ShadowfakelManitonngReports12Q201ORq-rft2Q2010Reyort.wpd <br />