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TABLE 9 <br /> Grab-Groundwater Sampling Plan <br /> Rough and Ready Island <br /> Stockton, California <br /> Approximate Sample <br /> Boring Elevation Target Sample Depth <br /> Identification Area (ft MSL) (ft bgs) Rationale <br /> -55 60-65 Evaluate vertical extent of VOC plume <br /> GGW-09 Site 4 Evaluate vertical extent of VOC plume and determine <br /> -70 75-80 depth of clay aquitard underlying water bearing zone at <br /> Site 4 <br /> GGW-10 Central Area -25 25-30 Evaluate lateral extent of VOC plume <br /> GGW-11 Landfill Area -55 55-60 Evaluate vertical extent of VOC plume <br /> -75 75-80 Evaluate vertical extent of VOC plume <br /> GGW-12 Landfill Area -55 55-60 Evaluate vertical extent of VOC plume <br /> -75 75-80 Evaluate vertical extent of VOC plume <br /> Evaluate lateral and vertical extent of VOC plume <br /> -15 15-20 between two areas with vinyl chloride concentrations <br /> greater than the MCL. <br /> Evaluate lateral and vertical extent of VOC plume <br /> GGW-13 Landfill Area -40 40-45 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 between two areas with vinyl chloride concentrations <br /> greater than the MCL. <br /> bgs= below ground surface <br /> ft=feet <br /> MCL= maximum contaminant limit <br /> MSL= relative to mean sea level <br /> VOC=volatile organic compound <br /> 2of2 <br />