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7-L Groundwater . Groundwater flow direction at the site is easterly The flow direction has vaned from northeast to southeast for the past year The current gradient is approximately 0 0008 ft/ft towards at the west end of the site, but steepens to approximately 0 003 near MW-5 43 Analytical Results of Soil and Groundwater Samples It hydrocarbon odors were noted in soil samples and auger returns from 35 to 45 feet Slight in MW-5. However, no volatile organic vapors were detected in the field using a PID. Soil Isamples from depths of 30 and 35 feet were analyzed for TPH as gasoline and BTE&X No petroleum hydrocarbons were detected in the samples analyzed TPH as gasoline was detected in the water sample from MW-5 at 93 ppb Toluene and xylenes were detected at 13 ppb and 0 55 ppb, respectively No benzene or ethylbenzene were detected in the water sample The analytical results are summarized in Table 2 The ' laboratory reports and chains-of-custody are included in Appendix C TABLE 2 ANALYTICAL RESULTS OF WATER SAMPLES Comfort Air, Inc. 1607 Turnpike Road, Stockton, California Well ID Sample TPH as Benzene Toluene Ethyl Xylene Date Gasoline benzene ' MW-1 3-3-92 300,000 7,500 12,000 2,200 9,200 10-20-92 120,000 11,000 13,000 2,200 8,200 MW-2 3-3-92 230,000 5,700 13,000 2,000 9,800 10-20-92 95,000 5,500 12,000 1,500 7,900 MW-3 3-3-92 260,000 8,500 17,000 2,000 9,500 I 10.20-92 76,000 5,500 10,000 1,200 6,000 MW-4 10-19-93 6,800 1,400 560 240 450 1-25-94 1,400 460 25 75 22 MW-5 6-2-94 93 ND 13 1 ND I0 55 parts per billion(ppb) ND None Detected 5.0 CONCLUSIONS No hydrocarbons were detected in the soil samples from MW-5, indicating that impacted soil at the site does not extend east, off Comfort Air's property However, impacted soil does remain in the area of the former UST aden MW ka msna.,n...esw I