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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 /> GGW-01 Site 3 -60 55-60 Evaluate vertical extent of Site 3 VOC plume beneath <br /> source area <br /> -25 20-25 Evaluate lateral extent of Site 3 VOC plume to west where <br /> wells are damaged and need replacement <br /> GGW-02 Site 3 <br /> -50 45-50 Evaluate lateral and vertical extent of Site 3 VOC plume to <br /> west where wells are damaged and need replacement <br /> -25 20-25 Evaluate lateral extent of Site 3 VOC plume downgradient <br /> GGW-03 Site 3 of source area <br /> -50 45-50 Evaluate lateral and vertical extent of Site 3 VOC plume <br /> downgradient of source area <br /> Evaluate lateral extent of Site 4 VOC plume to north. <br /> -5 First groundwater 5-10 Establish background VOC concentrations upgradient of <br /> GGW-04 Site 4 Site 4 source area. <br /> Evaluate northern and vertical extent of Site 4 VOC plume <br /> -35 40-45 and establish background VOC concentrations upgradient <br /> of Site 4 source area <br /> -5 First groundwater 5-10 Evaluate VOC concentrations west of W-020. <br /> GGW-05 Site 4 -35 40-45 Evaluate vertical and lateral extent of plume west of W- <br /> 020 <br /> -5 First groundwater 5-10 Evaluate lateral extent of VOC concentrations <br /> GGW-06 Site 4 downgradient of W-020 <br /> -35 40-45 Evaluate vertical and lateral extent of plume <br /> downgradient of W-020 <br /> -5 First groundwater 5-10 Evaluate western extent of Site 4 VOC plume <br /> GGW-07 Site 4 <br /> -35 40-45 Evaluate vertical and western extent of Site 4 VOC plume <br /> -5 First groundwater 5-10 Evaluate western extent of Site 4 VOC plume <br /> GGW-08 Site 4 <br /> -35 40-45 Evaluate vertical and western extent of Site 4 VOC plume <br /> 1oft <br />