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N <br />" PUBLIC HEALTH SERVICES �OPQ U I N <br /> SAN JOAQUINCOUNTY Q z� <br /> JOGI KHANNA M.D , NIT K 0. <br /> Health Officer <br /> P.O. Box 2009 ( 1601 East Hazelton Avenue) Stockton, Calitomia 95201 q t F o a <br /> ( 209 ) 468-3400 <br /> �1 <br /> KYLE A CHRISTIE <br /> ARCO PRODUCTS COMPANY <br /> P . O . BOX 5811 OCT1 6199?. <br /> SAN MATEO CA 94402 <br /> RE : Arco # 548 ( 1612 Hammer Lane , Stkn . , CA ) SITE CODE : 1127 <br /> Public Health Services Environmental Health Division ( PHS / EHD ) <br /> has reviewed your most recent Quarterly Report , dated August 18 , <br /> 1992 , and the " Report of Oil -Water Separator / Clarifier <br /> Investigation " . The following comments are meant to address both <br />'i <br /> of these documents and the current status of the site . <br /> a <br /> 1 ) The three Quarterly Reports submitted thus far have <br /> established the groundwater flow beneath this site to <br /> be slightly south of east and southeast . Under current <br /> conditions there are no monitoring wells east or <br /> southeast of the old tank pit area . Additional <br /> monitoring wells and the data they will provide are <br /> essential in evaluating the extent of hydrocarbon <br /> contamination on this site . <br /> i <br /> 2 ) Further investigation will be necessary to determine <br /> the lateral extent of contamination near both B - 12 , <br /> where oil and grease were encountered at depths of 20 <br /> and 40 feet , and B - 13 , with Toluene , ethyl -benzene , <br /> xylene , and TPH -G being found at 45 feet below grade <br /> surface . <br /> j 3 ) The " Report of Oil -Water Separation / Clarifier <br /> Investigation submitted by EA Engineering on <br /> September 25 , 1992 contains results which indicate the <br /> j presence of total recoverable petroleum hydrocarbons in the <br /> soil beneath the building . The lateral and vertical extent <br /> of contamination will need to be determined in order to <br /> evaluate the potential threat to ground water and possible <br /> remedial alternatives . <br /> A Division of San Joaquin County Health Care ti mces � � <br />