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I <br /> San Joaquin County DIRECTOR <br /> O PQM; cDonna Heran, REHS <br /> Environmental Health Department ASSISTANT DIRECTOR <br /> 600 East Main Street Laurie Cotuiia,RENS <br /> N. Stockton, California 05202-3029 PROGRAM COORDINATORS <br /> •_ N Carl Borgman,RENS <br /> Mike Huggins,RENS,RDI <br /> Website: www.Sjgov.o►g/ehd Margaret Lagorio,REHS <br /> Phone: (209) 468-3420 Robert McClellon, REHS <br /> Fax: (209) 464.0138 Jeff Carruesco, REHS,RDI <br /> Kasey Foley, REHS <br /> September 19, 2008 <br /> Robert Strong <br /> 1871 Middlefield <br /> Stockton, CA 95204 <br /> Subject: Ruth Strong Property Site Code: 2054 <br /> 5157 West Business Loop 205 <br /> Tracy, CA 95376 <br /> San Joaquin County Environmental Health Department (EHD) has reviewed Monitoring Well <br /> Installation Work Plan — September 2008 (Work Plan) dated!September 12, 2008, submitted <br /> on your behalf by Advanced G <br /> eoEnvlronmental (AGE) and has the following comments. <br /> In the Work Plan AGE proposes the installation of two groundwater monitoring wells to <br /> confirm the detections of petroleum hydrocarbon contam'ination' reported in two grab <br /> groundwater samples collected from the cone penetrometer test (CPT) boring advanced <br /> onsite on November 9, 2007. Total depth of the CPT boring was 110 feet below surface <br /> grade (bsg); water samples were collected at intervals of 64-69 feet bsg and 75-79 feet bsg. <br /> The EHD approves the installation of the two deeper, discretely screened groundwater <br /> .monitoring wells. AGE proposes that the screen interval of the wells to be 60-70 feet bsg. <br /> The EHD recommends the borings for the wells be continuously cored at depth to ensure <br /> placement of the screened interval across a water bearing zone, and that the screen interval <br /> be limited-to five feet in length. The contamination reported in`the 75-79 feet bsg grab sample <br /> must be verified and the vertical extent of the groundwater contamination must be defined. <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 Ste. 260, Rancho Cordova CA 95670 <br /> Brian Millman, AGE, 837 Shaw Road, Stockton CA 952.15 <br />