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G W-4 <br /> April 8, 2021 <br /> Page 2 <br /> To evaluate potential impacts to GW-4 from historical releases, it is recommended that GW-4 be <br /> resampled for volatile organic compounds(VOCs)by EPA Method 8260 and semi-volatile organic <br /> compounds (SVOCs) using EPA Method 8270-SIM. Due to the likely historical nature of the <br /> DRO in GW-4, PCBs and organic pesticides, herbicides,and fungicides are unlikely to be present; <br /> therefore, analysis for these compounds should not be necessary. The VOCs from EPA Method <br /> 8260B and SVOCs from EPA Method 8270C-SIM from Table A of Regulation 41 are provided in <br /> Table 1 and Table 2. The standards presented in Tables 1 and 2 are based on human health criteria, <br /> although no human health receptors have been identified at the Mine. <br /> GW-4 SW22 Sampling Plan RevFINAL <br />