Laserfiche WebLink
�4 <br /> RMC Geoscience, Inc. <br /> Shadow Lake Mobile Home Community <br /> April 13, 2009 <br /> Page 2 <br /> E <br /> 1 through 18(the pits are numbered from north to south)include a 6-inch-diameter perforated PVC Ik <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 I .through 1$ and include an 8- <br /> inch-diameter perforated PVC pipe in the center of the pit. I} <br /> f <br /> GEOLOGIC CONDITIONS <br /> The Shadow Lake facility is located in the Central Valley and is protected from a 100 year flood by <br /> i' <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 /> f 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 /> 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 /> 1 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 /> M <br /> GROUNDWATER MONITORING NETWORK <br /> I <br /> 1 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 /> k <br /> completed at the ground surface with an at-grade Christy box. Surveyed ground surface and 1 <br /> groundwater elevation reference elevations are shown in Table 1. As indicated in Table 1c, well ' <br /> MW-3 had been damaged and was repaired during the September 22, 2005 monitoring event. <br /> i` <br /> A, <br /> C-la_Projeas%Shado,,L.akeWonitonngReports51 Q211119Report5l QZou)Report.w pd <br /> I' <br /> I <br /> L <br />