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Sulfates - EPA 300; and <br />Sulfides - EPA 376.2. <br />4.3.1 CAM Metals <br />Groundwater analysis was conducted for the same 17 CAM Metals identified in Section 3.1.1. <br />Groundwater samples collected for analysis were filtered in the field to remove particulate matter to <br />assure that groundwater being analyzed is representative of metal concentrations that are soluble in <br />groundwater. The regulatory criteria applied to groundwater analytical results is the DTSC Maximum <br />Contaminant Level (MCL) (26 CCR, 64435). <br />Only one metal was detected above the MCL in groundwater samples collected from Parcel HI. <br />Arsenic was detected at concentrations of 130p.g/L and 60 pg/L in MW-1 and MW-4 respectively. <br />Arsenic was also detected at 60 AgIL in MW-00, a duplicate sample of MW4. The concentration <br />detected in MW-4 is not elevated significantly above the MCL of 50 pg/L for arsenic. However, the <br />concentration in MW-1 is more than twice the MCL. These detections of arsenic should be confirmed <br />by resampling. Comprehensive laboratory analytical data reports are included in Appendix B. <br />4.3.2 Chlorinated Pesticides and PCBs <br />Chlorinated Pesticides and PCBs were not detected in groundwater samples collected from MW-1 <br />and MW-4. Comprehensive laboratory analytical data reports are included in Appendix B. <br />4.3.3 Organophosphate Pesticides <br />No Organophosphate Pesticides were detected in groundwater samples collected from MW-1 and <br />MW-4. Comprehensive laboratory analytical data reports are included in Appendix B. <br />4.3.4 Total Recoverable Petroleum Hydrocarbons <br />TRPH was not detected in groundwater samples collected from MW-1 and MW-4. <br />4.3.5 Purgeable Halocarbons <br />Purgeable Halocarbons were not detected in groundwater samples collected from MW-1 and <br />MW-4. Comprehensive laboratory analytical data reports are included in Appendix B. <br />SAC28.013 <br />17 <br /> December 20, 1991