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Y Color Spot, Inc. August 16, 1991 (M88168G) • Environmental Services Site Remediation. Color Soot Lodi, Inc. , February 1990 • Resoonse Reply to San Joaquin County Public Health Services Environmental Health Division Letter Dated January 17. 1990, April 1990 • Suoolemental Site Assessment Color Soot, Inc. Facility, 5400 East Harney Lane Lodi, California, November 1990 These reports have been submitted to Color Spot, Inc. and to EHD. A ground water sample was collected from MW-1 on May 22, 1991, by SGD in the presence of Ms. Diane Hinson, Supervising Environmental Health Specialist, EHD. Before sample collection, the depth to ground water was measured at 73.25 feet below the top of the well casing. After approximately 6 gallons of ground water were removed from MW-1, no more water could be effectively removed with the bailer. After 1.25 hours, a ground water sample was collected in a pre-packaged, disposable bailer. The sample was transferred into two 40-milliliter glass volat .� organics analysis (VOA) vials, which contained NaHSO4 as preservative. The VOA vials were sealed with Teflon-lined screw caps without headspace, labeled, secured in plastic guard bottles, and placed in a cooler with ice. Chain-of- custody documentation accompanied the ground water sample from collection to delivery to the state-certified laboratory, Coast-to-Coast Analytical Services in Goleta, California. The ground water sample was analyzed for benzene, toluene, ethylbenzene, total xylenes, 1,2-dichloroethane, ethylene dibromide, and total petroleum hydrocarbons (TPH) . Analytical methods employed were EPA 5030 for purge-and-trap extraction followed by EPA 8260 (gas chromatography/mass spectrography) and California Department of Health Services (DHS) Draft TPH, modified. A laboratory-prepared travel blank accompanied the sampling equipment to the site and the sample back to the laboratory. As shown in Table 1 - Ground Water Sample Analytical Results, none of the fuel constituents were detected in the sample except toluene, at a trace concentration of 0.0006 milligrams per liter (mg/1) . This concentration is very much lower than the DHS applied action level of 0.1 mg/1 for toluene in drinking water. Table 1 also contains the results of the ground water analyses of samples from the nearby water wells previously documented in the SGD report dated April 1990, listed above. Three of the nearby wells contained trace concentrations of toluene equivalent to that found in MW-1. All four of the nearby wells contained trace amounts of benzene and TPH, but MW-1 did not. 1