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- al <br /> .. - <br /> ;S a <br /> 3164 Gold Camp D.ivs <br /> SUite 200 <br /> Rancho Cordova,Califomi,1,5 /0-6021 <br /> w//{/ � a'seraymeaT n 9151038-2085 <br /> March 4,2002 <br /> Ms. Rebecca E. Setliff <br /> San Joaquin County, Public Health Services <br /> ' Envlro—runental IHealth Divi5lon <br /> 304 East Weber Avenue, Third Floor <br /> Stockton, California 95202 <br /> Subject: Work Plan.for Additional Sift Assessment <br /> and Interim Remediation/Feasibility Testin,, <br /> ARCO Facility No. 5469 <br /> 130 South Wilson Way <br /> Stockton, California <br /> Delta Project No D000-336 <br /> Dear Ms. Setliff: <br /> -Delta Environmental Consultants, Inc. {Delta), on behalf of Atlantic Richfield Company <br /> (ARCO), is submitting this work plan to'!conduct additional site assessment and interim <br /> F remediation/feasibility testing at ARCO Facility No. 5469, located at -130 South Wilson <br /> Way, Stockton, California(Figure 1). This work plan was prepared in response to a letter <br /> from San. Joaquin County Public Health Services, Environmental Health Division <br /> (PHS/EHD), dated January 17, 2002. The PHS/EHD letter requested further evaluation <br /> of the lateral and vertical extent of a`petroleum hydrocarbon impact to soil and <br /> F groundwater. In addition, the letter also requested that feasibility testing be conducted to <br /> F evaluate a,feasible remedial alternative. <br /> This work plan proposes" to install monitoring wells to characterize the lateral extent of <br /> the dissolved hydrocarbon impact, and one CPT boring for the assessment of the vertical <br /> extent of ixzipact. -The work plan also proposes to initiate interim remediation/feasibility <br /> testing through the installation of an ozone microsparge system. Given the extent of <br /> impact, the presence of other petroleum"hydrocarlion plumes in the immediate vicinity, <br /> and local geology, ozone injection appears to be the.most feasible remedial alternative. In <br /> addition, discussions with PHS/EHD personnel indicated that ozone injection has been <br /> successfully implemented at other sites in" San Joaquin County. <br /> SITE BACKGROUND <br /> In February 1999, The IT Group (IT) observed the removal and replacement of product <br /> lines and associated dispensers. Samples collected din the vicinity of the dispenser islands <br /> indicated 'the presence of total petroleum hydrocarbons as gasoline (TPHG) at <br /> concentrations up to 7.32 milligrams per'kiloa am (mg/kg), benzene at a concentration of <br /> PT-lridirg - Competitive Edrge <br />