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x <br /> Mr. Kyle Christie <br /> December 9, 1988 <br /> r� Page 7 <br /> Recommendations <br /> Brown and Caldwell recitnmends ARCO continue with quarterly groundwater sampling of the <br /> on- and off-site monitoring wells. This data will make it possible to track the BTX plume. <br /> This data will also be useful in designing the remediation of the contaminated groundwater. <br /> T , <br /> Brown and Caldwell also recommends that ARCO proceed with a detailed characterization of <br /> hydrocarbon occurrence in the vadose zone at the site. A. detailed characterization of the <br /> extent of hydrocarbon contamination in the vadose zone is necessary for designing a soil <br /> remediation system. if hydrocarbons in the vadose zone are the source of BTX in <br /> groundwater, then remediation of hydrocarbon contamination in the vadose zone will be an <br /> s <br /> important element in the cleanup of groundwater beneath this site. <br /> ` Brown and Caldwell also recommends ARCO proceed with the installation of the planned <br /> extraction well and air stripping treatment system to remediate the groundwater beneath the <br /> site. <br /> Should you have any questions regarding this report, please contact me or Ms. Jeanne <br /> Wallberg at (916) 441-4123. <br /> ti <br /> Very truly yours, <br /> $& BROWN AND CALDWELL <br /> Aaw�nce E. Phillips <br /> Project Manager <br /> %b LEP:JSW:mkw <br /> cc/enc: Mr. Gordon Boggs, California Regional Water Quality Control Board, Sacramento <br /> Ms. Laurie Cotulla, San Joaquin Local Health District, Stockton <br /> Mr. Fran Fork-as, City of Lodi, Lodi <br /> Mr. Robert Grimshaw, Stockton Sanitary Engineering Branch, Stockton <br /> R Mr. Chris Winsor, ARCO Products Company, Lob Angeles <br /> r <br /> ` BROWN AND CALDWELL <br /> j �"" <br /> 7235 STREET SACRAMENM CAUFMNIA VAMIM•(9761444.OW <br />