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Atlantic Richfield Company 7 <br /> ARCO 595 6100 North Highway 99 Stockton California September 13 2002 <br /> CONCLUSIONS AND RECOMMENDATIONS <br /> Petroleum hydrocarbons in soil have been delineated both Iaterally and vertically during <br /> this and previous investigations <br /> Based on the results of this assessment, SECOR recommends continued monitoring and <br /> sampling of the newly installed shallow and deep wells to confirm the presence of fuel <br /> oxygenates and 1,2-DCA off-site, and to evaluate the groundwater gradient and flow <br /> direction in shallow and deep water bearing zones beneath and in the vicinity of the site <br /> Following two additional quarters of sampling, SECOR will evaluate the need for <br /> installing additional wells to delineate the lateral and vertical extent of the dissolved <br /> plume SECOR recommends the continued operation of the off-site remediation system <br /> installed at the well head of domestic well DW-1 to maintain groundwater quality <br /> If you have any questions or comments regarding this report, please feel free to call us at <br /> (916) 861-0400 <br /> Sincerely, <br /> SECOR International Incorporated <br /> QaoEss�o <br /> Kristen Flesoras <br /> Project Scientist <br /> LU NO C 058399 r <br /> * EV I <br /> - <br /> Rusty Benkosky, P E Rn! OF CA��Ep�a <br /> Project Manager <br /> 1 1ARC0105951Reportslwe11 msta113 doc <br />