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I' <br /> "SOMA <br /> September 14, 1993 Working 7o Restore Nature <br /> ARCO Service Station 2168, Stockton, California <br /> i <br /> WORK IN PROGRESS <br /> ARCO is currently negotiating with the City of Stockton to gain access to public property <br /> to install two groundwater monitoring wells near the site These wells will be used to assess <br /> potential offstte sources <br /> CONCLUSIONS AND RECOMMENDATIONS <br /> A linear depression trending northwest-southeast near well MW-4 was present in the <br /> 1 potentiometnc surface Dissolved gasoline hydrocarbons and halogenated volatile organic <br /> compounds were detected in samples from the five wells On this basis, we recommend <br /> continued quarterly evaluation of groundwater beneath the site, including analyzing water <br /> samples from all monitoring wells for halogenated volatile organic compounds in addition <br /> to TPHg and BTEX <br /> 1 <br /> We recommend that a copy of this report be forwarded to Mr Michael Infurna, San Joaquin <br /> Public Health Services, 445 North San Joaquin, Stockton, California 95202 and Mr Jim <br /> Manghan, California Regional Water Quality Control Board, 3443 Routier Road, Suite A, <br /> Sacramento, California 95827-3098. Please call if you have any questions regarding this <br /> status report. <br /> Sincerely, <br /> RESNA Industries <br /> �O .4 <br /> Jay R Johnson <br /> No 4313 Program Manager <br /> �91f <br /> 1 OF Cal. <br /> Ohn B Bobbitt <br /> R G. 4313 <br /> Attachments Plate 1, Site Vicinity Map <br /> Plate 2, Generalized Site Plan <br /> 1 Plate 3, Potentiometric Map <br /> Table 1, Groundwater Monitoring Data <br /> Table 2, Results of Additional Analyses of Groundwater Samples <br /> Appendix EMCON Associates Field Notes, Chain of Custody Record, and <br /> Laboratory Analysis Reports <br /> 0712rcar <br /> 3100" 3 <br />(1 <br />