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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' Number Rationale <br /> GGW-01 Site 3 -60 55-60 X 1 Evaluate vertical extent of Site 3 VOC plume beneath <br /> source area. <br /> -25 20-25 X 3 Evaluate lateral extent of Site 3 VOC plume to west <br /> where wells are damaged and need replacement <br /> GGW-02 Site 3 - <br /> Evaluate lateral and vertical extent of Site 3 VOC <br /> -50 45-50 X 3 plume to west where wells are damaged and need <br /> replacement <br /> -25 20-25 X 2 Evaluate lateral extent of Site 3 VOC plume <br /> GGW-03 Site 3 - - - downgradient of source area <br /> -50 45-50 X 2 Evaluate lateral and vertical extent of Site 3 VOC <br /> plume downgradient of source area <br /> Evaluate lateral extent of Site 4 VOC plume to north. <br /> -5 First groundwater 5-10 X 5 Establish background VOC concentrations upgradient <br /> GGW-04 Site 4 of Site.4 source area. -- <br /> Evaluate northern and vertical extent of Site 4 VOC <br /> -35 40-45 X 5 plume and establish background VOC concentrations <br /> upgradient of Site 4 source area <br /> -5 First groundwater 5-10 X 7 Evaluate VOC concentrations west of W-020 <br /> GGW-05 Site 4 -35 40-45 X 7 Evaluate vertical and lateral extent of plume west of <br /> W-020 <br /> -5 First groundwater 5-10 X 8 Evaluate lateral extent of VOC concentrations <br /> GGW-06 Site 4 — - — downgradient of W-020 <br /> -35 40-45 X 8 Evaluate vertical and lateral extent of plume <br /> downgradient of W-020 <br /> -5 First groundwater 5-10 X 6 Evaluate western extent of Site 4 VOC plume <br /> GGW-07 Site 4 -35 40-45 X 6 Evaluate vertical and western extent of Site 4 VOC <br /> plume <br /> 1 of3 <br />