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a <br /> 19449 Riverside Drive,Suite 230,Sonoma,California 95476 <br /> CONESTOGA-ROVERS Telephone: 707.935.4850 Facsimile: 707.935.6649 <br /> &ASSOCIATES '�-� www.CRAworld.cam <br /> April 9,2009 Reference No.241511 <br /> PERMI'V f"E RVIC"' <br /> Ms.Vicki McCartney <br /> San Joaquin County Environmental Health Departmei it q `l A. <br /> 600 East Main Street <br /> Stockton,California 95202 <br /> Dear Ms. McCartney: AA <br /> Re: Interim Remedial System Shutdown Request and Case Closure Request <br /> Former Shell Service Station <br /> 1313 East Charter Way <br /> Stockton,California <br /> SAP Code 136138 <br /> Incident No. 98996179 <br /> Agency Case No. 692 <br /> Conestoga-Rovers & Associates (CRA) prepared this document on behalf of Equilon Enterprises <br /> LLC dba Shell Oil Products US(Shell)to request shut own of the interim-remediation system <br /> operating at the subject site. In addition this documer t presents a summary of site conditions <br /> that indicate that case closure may be appropriate for I his site. <br /> The subject site is located on the northeast corner of E st Charter Way and Airport Way in a <br /> mixed commercial/residential area of Stockton,California (Figure 1). The former site layout <br /> included two station buildings,three fuel underground storage tanks (USTs), and four <br /> dispenser islands (Figure 2). The subject site is currently a vacant lot. <br /> INTERIM-REMEDIATION SYSTEM SHUTDOWN REQUEST <br /> Shell recently performed an internal review of the performance of the temporary groundwater <br /> extraction(GWE) system operating at this site to evalt Late its effectiveness at removing <br /> 1,2-dichloroethane (1,2-DCA) from the groundwater I eneath the site. This evaluation included <br /> looking at the 1,2-DCA concentration trends,cumulat ve mass removal,and the cost of <br /> operation to remove 1,2-DCA. Below is a description f the existing GWE system and a <br /> discussion of the effectiveness evaluation findings. <br /> Equal <br /> Employment <br /> Opportunity Employer <br /> worldw de Engineering, Environmental,Construction,and IT Services <br />