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ENVIRONMENTAL HEALTH`DEPARTMENT <br /> pp ll,IlV C SAN JOAQUIN COUNTY <br /> Unit Supervisors <br /> Donna K Heran,R.E.H.S. Carl Borgman,R.E.H.S. <br /> < 304 East Weber Avenue, Third Floor <br /> Director Mike Huggins,R.E.H.S.,R.D.I. <br /> AI Olsen,R.E.H.S. Stockton, California 95202-2708 Douglas W.Wilson,R.E.H.S. <br /> Program Manager Telephone: (209) 468-3420 Margaret Lagorio,R.E.H.S. <br /> Laurie A.Cotulla,R.E.H.S. Robert McClellan,R.E.H.S. <br /> Program MFax: (209) 464-0138 <br /> gr Manager g Mark Brcellos,R.E.H.S. <br /> FEB 01XM <br /> SUSAN OAKDEN VICTORIO ARANDA <br /> RICHARD OAKDEN TRUST 5487 E MARSH STREET <br /> 1200 WATT AVENUE STOCKTON CA 95215 <br /> SACRAMENTO CA 95864 <br /> RE: Former Electro Delta <br /> 821 S. Wilson Way <br /> Stockton, CA <br /> San Joaquin County Environmental Health Department (EHD) has reviewed <br /> "Additional Site Assessment Report" dated October 25, 2005, and "Quarterly <br /> Report—Third Quarter 2005" dated November 15, 2005, prepared by Advanced <br /> GeoEnvironmental, Inc. for the above referenced site. The site assessment <br /> report discusses the results of the cone penetration tests (CPT's) that were <br /> conducted in August 2005 and recommends installation of another shallow <br /> screened monitoring well and depth discrete monitoring wells in the former <br /> underground storage tank (UST) area to confirm the vertical definition of the <br /> dissolved hydrocarbon contamination. The Third Quarter report confirms <br /> groundwater contamination at the site and recommends continuation of quarterly <br /> ground water monitoring and installation of a shallow screened groundwater <br /> monitoring well within the former UST location. <br /> EHD directs that quarterly ground water monitoring continue. EHD concurs that <br /> another shallow screened monitoring well should be installed. EHD recommends <br /> that this monitoring well be installed between the locations of boring B6 and <br /> CPT3 (downgradient of the former UST location). EHD concurs that a deeper <br /> screened monitoring well should be installed in the hydrogeologic unit 3 identified <br /> in the October 2005 site assessment report but recommends it be placed <br /> downgradient of the former UST location. <br /> In previous investigations soil sample analytical results have documented that <br /> the soil in the former UST area contains high concentrations of petroleum <br /> hydrocarbons. EHD directs that removal of this soil be evaluated so that the <br /> mass of contamination that may be left in place at this site will be reduced. If the <br /> soil removal evaluation results in a proposal to excavate the contaminated soil, <br /> installation of the monitoring wells discussed above should occur after the soil <br /> removal work. <br />