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� u�a <br /> November 1, 1993 =�AWA"17 <br /> ARCO Service Station 2168, Stockton, California Working to Restore Nature <br /> (Table 3) Concentrations of TPHg and benzene are shown on Plate 2 <br /> WORK IN PROGRESS <br /> Two groundwater monitoring wells were installed during October to assess potential offsite <br /> sources of hydrocarbons in groundwater Results of this subsurface investigation will be <br /> submitted during fourth quarter 1993 <br /> CONCLUSIONS AND RECOMMENDATIONS <br /> The direction of groundwater flow is towards the northeast Dissolved gasoline <br /> hydrocarbons and halogenated volatile organic compounds were detected in samples from <br /> the five wells TOG was detected in sample collected from MW-2. We recommend <br /> continued quarterly evaluation of groundwater beneath the site, including analyzing water <br /> samples for halogenated volatile organic compounds, TPHg and BTEX We also <br /> recommend water sample from MW-2 be analyzed for TOG <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 Ms <br /> Elizabeth Thayer, California Regional Water Quality Control Board, 3443 Routier Road, <br /> Suite A. Sacramento, California 95827-3098 <br /> tooarcar <br /> 31009-9 3 <br />