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• San Joaquin County Public Health Services <br /> Environmental Health Division <br /> May 2, 1995 <br /> Page 3 <br /> The well casing will for DMW-5 will be fitted with an expandable rubber air-tight plug <br /> Similar plugs will be placed on the existing monitoring wells at the site <br /> • Information on the TPH-IDQ test method utilized by D&M Laboratories is enclosed for your <br /> information However, as noted above, we will utilize EPA Methods 8015M-d and 8015-g <br /> as your agency is more familiar with those test methods <br /> In response to your expressed concern about the potential for solvents and/or gasoline to be <br /> in the vicinity of the former waste oil tank, I reviewed assessment reports prepared for the <br /> site The November 1987 report "Soil and Groundwater Assessment, American Molding and <br /> Millwork" prepared by Kleinfelder indicates that all soil samples analyzed for TPH were <br /> analyzed for both the gasoline and diesel ranges, but that only compounds in the diesel range <br /> were reported to be present In addition, samples from 15 and 25 feet bgs in soil boring <br /> • B-13 located approximately 40 feet southeast of the former waste oil tank was analyzed for <br /> solvents by EPA Method 8240 and no compounds were reported to be present <br /> Appendix C in the May 1992 report "Site Remediation Report, Former American Forest <br /> Products Facility, 2801 West Lane, Stockton, California" prepared by Dames & Moore <br /> presents records for removal of the waste oil tank in 1988 The records show that at the <br /> request of the San Joaquin Local Health District, samples from 13 feet bgs under the waste <br /> oil tank were submitted to California Water Labs and analyzed for different TPH ranges, <br /> BETX (EPA Method 8020), PCBs, and chlorinated solvents (EPA Method 8010) Only TPH <br /> compounds in the diesel range were reported to be present <br /> As indicated in the discussion of analytical methods, we will analyze samples from soil <br /> boring SB-2 for TPH/G We will collect adequate sample volumes to allow tests for solvents <br /> to be run However, I would like to further discuss with you the basis for determining which <br /> samples need to be analyzed for solvents <br /> Additional Modification of the November 1994 Work Plan <br /> . Due to the expected elevation of groundwater and the potential for a significant decrease in <br /> the elevation in the future, Dames & Moore proposes to construct monitoring well DMW-5 <br /> SAC 149 05 <br />