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Groundwater Data Gaps Site Investigation <br /> 8 March 2019 <br /> Page 4 <br /> • GGW-02 will be collected and analyzed for VOCs to evaluate the lateral and vertical extent <br /> of VOCs in groundwater to the west, where wells are damaged and need to be replaced <br /> (Data Gap 3). <br /> • GGW-03 will be collected and analyzed for VOCs to evaluate the lateral and vertical extent <br /> of VOCs downgradient of the source area(Data Gap 2). <br /> At Site 4,the following samples are proposed to be collected to address the data gaps identified: <br /> • GGW-04 will be collected and analyzed for VOCs to evaluate the lateral extent of VOCs <br /> to the north and to establish background VOC concentrations upgradient of Site 4 source <br /> area(Data Gap 5). <br /> • GGW-05 and GGW-06 will be collected and analyzed for VOCs to evaluate the VOC <br /> concentrations west of W-20 (Data Gap 7 and 8). <br /> • GGW-07 and GGW-08 will be collected and analyzed for VOCs to evaluate western extent <br /> of VOCs in groundwater at Site 4 (Data Gap 6). <br /> • GGW-09 will be collected and analyzed for VOCs to evaluate the vertical extent of VOCs <br /> at Site 4(Data Gap 7). <br /> • GGW-10 will be collected and analyzed for VOCs to evaluate the lateral and vertical <br /> downgradient extent of vinyl chloride at Site 4 (Data Gap 4). <br /> In the Central Area, the following samples are proposed to be collected to address the data gaps <br /> identified: <br /> • GGW-11 will be collected and analyzed for VOCs to evaluate the lateral extent of VOCs <br /> in the Central Area(Data Gap 9). <br /> • GGW-12 and GGW-13 will be collected and analyzed for VOCs to evaluate the lateral and <br /> northern extent of VOCs in the Central Area(Data Gap 9). <br /> • GGW-14 will be collected and analyzed for VOCs determine the presence of VOCs in <br /> groundwater in the Central Area near wells W-299, W-300, and W-318, which could not <br /> be located during the groundwater monitoring sampling event(Data Gap 10). <br /> In the Landfill Area, the following samples are proposed to be collected to address the data gaps <br /> identified: <br /> 2019_0308_RRI_Revised Data Gaps Investigation Memo <br /> engineers I scientists I innovators <br />