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dF <br /> W <br /> URS <br /> RECENED . <br /> p;:Q 0 6 2004 <br /> ENVIRONMENT HEALTH <br /> PERMIT/SERVICES <br /> April 6,2004 <br /> Ms.Vicki McCartney,REHS 2186 <br /> Unit IV-Site Mitigation 06.a4 <br /> San Joaquin County Environmental Health Department <br /> 304 East Weber Avenue,Third Floor <br /> Stockton,California 95202-2708 <br /> RE: Workplan Addendum for Air Sparging Well Installation <br /> ARCO Station No.2186 <br /> 3212 North California Street,Stockton,California 95204 <br /> Dear Ms.McCartney: <br /> On behalf of Atlantic Richfield Company (ARCO - a BP affiliated company), URS Corporation <br /> Americas (URS) has prepared this workplan addendum to conduct air-sparging (AS) well installation <br /> activities at ARCO Station 2186 located at 3212 North California Street in Stockton,California(Figure <br /> 1). This workplan addendum has been written in response to the San Joaquin County Environmental <br /> Health Department(SJCEHD)letter dated March 22, 2004(Attachment A). The SJCEHD letter directs <br /> the following amendment t%the URS Workplan for Groundwater Monitoring and Remediation Well <br /> Installation dated February 1*2004: <br /> 1. Submit a workplan by April 30, 2004,for a pilot test to evaluate the proposed IAS system. Also <br /> include an estimate, with calculations and assumptions, of the hydrocarbon mass at this site. <br /> URS concurs with the above directive and therefore proposes to install one AS well to a depth of 65 feet <br /> +j below ground surface for the,purpose of conducting an AS pilot test. The proposed location of the <br /> single AS well is shown on the amended Proposed Well Locations map (Figure 2). All permitting, <br /> drilling, soil sampling, laboratory analysis, lithologic logging, well construction, and well surveying <br /> details as written in the URS Workplan for Groundwater Monitoring and Remediation Well Installation <br /> dated February 1,22,'2004,will apply to the installation of the proposed single AS well. <br /> URS will produce a pilot test workplan with site hydrocarbon mass calculations (and assumptions used <br /> for the calculations)following installation of the AS well. <br /> j <br /> URS Corporation <br /> Crown Corporate Center <br /> 2570 Gateway Oaks Drive,Suite 300 <br /> Sacramento,CA 95833 <br /> Tel;916.679.2000 <br /> Fax:916.679.2900 <br /> Y, <br />