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t 15 June 2409 AGE-NC ProjectNo.05-1306 f Page 3 of 33 2.3. WELL SEARCH AND SURVEY A well survey was conducted by ATC Associates,Inc. (ATC)in 2000 that searched Department of Water Resources(DWR)files,performed a site and vicinity reconnaissance,and contacted the City of Stockton and California Water Service for wells within 2,000 feet of the site vicinity(ATC 2000). According to ATC,the nearest well is located approximately 400 feet southeast of the site and is a monitoring well. The nearest well potentially used for drinking water is a domestic well located at 215 South Los Angeles Street, approximately 1,300 feet to the south of the site. California Water Service Well#70, located at Navy Drive and Charter Way, is approximately 2,800 feet south east of the site. In addition, San Joaquin County Environmental Health Department (EHD) ordinances require a minimum 50 foot sanitary seal at the top of any public water well; additionally,the EHD ordinances require a minimum 100 foot sanitary seal at the top of any public water supply well in areas with documented ground water contamination. These sanitary seal requirements would preclude shallow affected water at the site from future use as a source of municipal water. A copy of the ATC well survey is included in Appendix B. The McCormick and Baxter (M&B) wood preserving company operated on a 29-acre site at 1214 West Washington Street (adjacent site to the east of Penny-Newman Grain) in Stockton, .m- California from 1942 until 1990. The M&B site is located in an industrial area near the junction of the I-5 interchange(Figure 1).The northern boundary of the site borders Old Mormon Slough,which y empties into the Port of Stockton turning basin on the San Joaquin River. M&B chemically treated wood products in pressure cylinders with various preservation solutions containing creosote, pentachlorophenol (PCP), arsenic, copper, chromium, and zinc. Solvents or carriers for these preservatives reportedly included petroleum-based fuels such as fuel oil,kerosene and diesel,butane, and ether. The chemicals of concern (COC) identified for the M&B site are PCP, carcinogenic polynuclear aromatic hydrocarbon(CPAH),arsenic,dioxins/furans and naphthalene.Dioxinslfurans are believed to have originated as manufacturing impurities contained in the PCP solution. These constituents have longevity greater than the diesel release on the former Continental Grain site and will likely remain a threat to the regional ground water well beyond the minor threat presented by I the residual diesel impacts at the former Continental Grain site. Waste oils generated from the wood-treatment processes were disposed of in unlined ponds and concrete tanks on-site. Previous y characterization found soils throughout the site were contaminated with constituents of creosote. Dense Non Aqueous Phase Liquids (DNAPLs) from the site are present in the subsurface. i Drilling and installation ofmonitoring wells has occurred on and off the M&B site,including a series of monitoring wells installed on the Penny-Newman Grain site to the west of the LUST incident, related to the M&B investigation. The water table, at the M&B site, is located approximately 10-15 feet bgs.The United States Environmental Protection Agency(EPA)has supplied information regarding the construction and water quality of these recently installed monitoring wells including -�. MW-11A, MW-12B, and MW-17D. The EPA supplied well logs and a copy of the 2006 Advanced GeoEnvironmental,Inc. 1