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CAM metals - STLC - EPA 6010; <br />Chlorinated Pesticides and PCBs - EPA 8080; <br />Organophosphate Pesticides - EPA 8140; and <br />Total Recoverable Petroleum Hydrocarbons (TRPH) - EPA 418.1. <br />Borings for monitoring wells MW-1 and MW-4 were also used to supplement the soil <br />investigation. Two relatively undisturbed soil samples were collected from each of the monitoring wells <br />borings. Soil samples were collected from near the ground surface (0 to 6 inches bgs), and from the <br />capillary fringe (approximately 10 feet bgs). Soil samples collected from MW-1 and MW4 were <br />analyzed for the constituents listed above plus the following constituents: <br />Volatile Organic Compounds (VOCs) - EPA 8240; and <br />Semi-volatile Organic Compounds (SVOCs) - EPA 8270. <br />Soil samples collected from MW-1 were also analyzed for: <br />Elemental (Total) Sulphur - EPA 6010; and <br />Sulfates - EPA 9030. <br />Task 3 - Groundwater Investigation <br />This task consisted of the drilling, installing, developing, and sampling of groundwater monitoring <br />wells. Groundwater monitoring well locations were coordinated with DBT representatives to avoid <br />interference with planned future development of the parcels. Well locations are shown on Figure 2. One <br />upgradient (background) groundwater monitoring well (MW-1) was located in the northeast corner of the <br />portion of Parcel III, just south of the tracks. Groundwater monitoring wells were located downgradient <br />of the proposed sulphur stockpile in Parcel I (MW-2), the proposed copper concentrate stockpile in Parcel <br />II (MW-3), and the existing petroleum coke stockpile in Parcel III (MW-4). San Joaquin County well <br />installation permits were obtained prior to the implementation of this task. Drilling, well completion, <br />development and sampling protocols are presented in Appendix A. <br />Groundwater samples from MW-1 and MW-4 were analyzed for the following constituents: <br />CAM metals - TTLC - EPA 6010; <br />Chlorinated Pesticides and PCBs - EPA 608; <br />Organophosphate Pesticides - EPA 614; <br />Total Recoverable Petroleum Hydrocarbons (TRPH) - EPA 418.1; <br />Purgeable Halocarbons - EPA 601; <br />SAC28.013 <br /> December 20, 1991 <br />3 <br />MoORE