ARCHIVED REPORTS XR0001332 - Laserfiche WebLink

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I March 12, 1993 Working To Restore Nature I ARCO Service Station 2168, Stockton, California coliform bacteria The results of analyses are summarized in Tables 1 and 2. Copies of the laboratory analysis reports are in the Appendix 1 Results of analyses of water samples indicated TPHg, BTEX, and 1,2-dichloroethane were detected in ground-water samples from the three wells The highest concentrations of TPHg and benzene were detected in well MW-3 (67,000 to 12,000 ppb, respectively) 1,2,- dichloropropane was detected in wells MW-1 and MW-2 Total and fecal coliform bacteria were not detected in well MW-3 WORK IN PROGRESS ff In January 1993, RESNA observed the drilling of seven soil borings and the installation of two groundwater monitoring wells and four vapor-extraction wells to evaluate whether ` gasoline hydrocarbons are present in soil beneath the dispenser islands and to further delineate gasoline hydrocarbons in ground water beneath the site We are,�urrently evaluating field and laboratory data CONCLUSIONS AND RECOMMENDATIONS The ground-water flow direction was to the northeastduring this monitoring event Dissolved gasoline hydrocarbons and 1,2-dichloroethane were detected in samples from the three wells 1,2-dichloropropane was detected in wells MW-1 and MW-2 Total and fecal coliform bacteria were not detected in well MW-3 On this basis, we recommend continued quarterly evaluation of ground water beneath the site to include analyzing water samples from all monitoring wells for halogenated volatile organic compounds in addition to TPHg and BTEX. We recommend that a copy of this report be forwarded to Mr Michael Infurna, San Joaquin Public Health Services, 445 North San Joaquin, Stockton, California 95202 and Mr Jim Manghan, California Regional Water Quality Control Board, 3443 Routier Road, Suite A, Sacramento, California 95827-3098 i 0125ccar 31009-6 3