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San Joaquin County <br /> Environmental Health Department DIRECTOR <br /> ).. _ .O Donna Heran,REHS <br /> r.` ? 600 East Main Street <br /> PROGRAM COORDINATORS <br /> y. < Stockton, California 95202-3029 Robert McClellon,REHS <br /> Jeff Carruesco,REHS,RDI <br /> • cq</koR�)P • Website: www.sjgovorg/ehd Kasey Foley,REHS <br /> Phone: (209)468-3420 <br /> Fax: .(209)464-0138 <br /> May 20, 2010 <br /> Jon Armstrong Albert Scannavino <br /> BP West Coast Products LLC Scannavino Properties <br /> 501 Westlake Park Boulevard 5463 Cherokee Lane <br /> WL 1-28. 160D Stockton, CA 95215 <br /> Houston,TX 77079 <br /> Subject: ARCO Station#595 <br /> 6100 North Highway 99 <br /> Stockton, CA 95212 <br /> The San Joaquin County Environmental Health Department (EHD) has reviewed Work Plan for Additional <br /> Subsurface Investigation (Work Plan), dated May 7, 2010, submitted on your behalf by ARCADIS, and <br /> has the following comments. <br /> In the Work Plan, Arcadis proposes to continue the investigation of petroleum hydrocarbon contamination <br /> remaining at this site with the installation of soil borings to collect soil samples for laboratory analysis, and <br /> one deep, discretely-screened groundwater monitoring well. <br /> The soil borings will be advanced at three locations to investigate soil contamination reported during tank <br /> and dispenser island removal activities that took place in December 2005, when the station was <br /> demolished. The areas of investigation are DI-1, located on the western side of the property; DI-4, <br /> located on the northern side of the property; and P-3, located near the middle of the property by the <br /> southwestern corner of the former underground storage tank (UST) pit. Arcadis proposes that the borings <br /> near the former dispenser islands will be to total depth of 20 feet below surface grade (bsg), and the <br /> borings in the former UST pit will be to total depth of 25 feet bsg. <br /> The deep groundwater monitoring well will be located between existing groundwater monitoring wells <br /> MW-4 and DMW-1 R, and will be drilled to approximate total depth of 130 feet bsg, but the actual total <br /> depth and placement of the screened interval of the well will be determined by site specific geologic data <br /> obtained during the drilling. <br /> The EHD approves the proposed scope of work with the condition that the soil borings extend beyond <br /> their proposed depths of 20 or 25 feet bsg if soil discoloration or petroleum hydrocarbon odors are <br /> present; and that the deep monitoring well is continuously cored at depth.(115 feet bsg and below) to <br /> ensure placement of the screen over an appropriate water bearing interval. <br /> If you have any questions please call Lori Duncan at(209)468-0337. <br /> Sincerely, <br /> Lori Duncan, REHS Nuel C. Henderson, Jr., PG <br /> Senior Registered Environmental Health Specialist Engineering Geologist <br /> c: James Barton, CVRWQCB, 11020 Sun Center Drive, Suite 200, Rancho Cordova, CA 95670 <br /> Tom Potter, ARCADIS, 950 Glenn Drive, Suite 125, Folsom, CA 95630 <br />