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Table 1 <br /> Grab-Groundwater Sampling Plan <br /> Rough and Ready Island <br /> Stockton,California <br /> Approximate Lab <br /> Boring Sample Elevation Target Sample Depth Analysis Data Gap <br /> Identification Area (ft MSL) (ft b s) VOCs� plumber Rationale <br /> -5 First groundwater 5-10 X 6 Evaluate western extent of Site 4 VOC plume <br /> GGW-08 Site 4 -35 40-45 X 6 Evaluate vertical and western extent of Site 4 VOC <br /> plume <br /> GGW-09 Site 4 -55 60-65 X 7 Evaluate vertical extent of VOC plume <br /> -70 75-80 X 7 Evaluate vertical extent of VOC plume at Site 4 <br /> -25 20-25 X 4 Evaluate the lateral downgradient extent of vinyl <br /> GGW-]0 Site <br /> chloride near W-109. <br /> - - - <br /> -50 45-50 X 4 Evaluate the vertical downgradient extent of vinyl <br /> chloride near W-109. <br /> GGW-I I Central Area -25 25-30 X 9 Evaluate lateral extent of VOC plume <br /> GGW-12 Central Area -25 20-25 X 9 Evaluate lateral extent of VOC plume <br /> GGW-13 Central Area -25 20-25 X 9 Evaluate northern extent of VOC plume. <br /> W-299,W-300,and W-318 unable to be found during <br /> sampling event. Collect sample to evaluate VOC <br /> GGW-14 Central Area -25 20-25 X 10 concentrations in area with vinyl chloride <br /> concentration greater than the MCL <br /> GGW-15 Landfill Area -55 55-60 X 12 Evaluate vertical extent of VOC plume <br /> -75 75-80 X 12 Evaluate vertical extent of VOC plume <br /> GGW-16 Landfill Area -55 55-60 X 12 Evaluate vertical extent of VOC plume <br /> -75 75-80 X 12 Evaluate vertical extent of VOC plume <br /> Evaluate lateral and vertical extent of VOC plume <br /> -15 15-20 X 1 I between two areas with vinyl chloride concentrations <br /> greater than the MCL <br /> Evaluate lateral and vertical extent of VOC plume <br /> GGW-17 Landfill Are -40 40-45 X 1 1 between two areas with vinyl chloride concentrations <br /> greater than the MCL <br /> Evaluate lateral and vertical extent of VOC plume <br /> -60 60-65 X 1 1 between two areas with vinyl chloride concentrations <br /> greater than the MCL <br /> 2of3 <br />