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San Joaquin County DIRECTOR <br /> Donna Heran,REHS <br /> °�`" Environmental Health Department <br /> M ASSISTANT DIRECTOR <br /> 600 East Main Street Laurie Colulla,REHS <br /> Stockton, California 95202-3029 PROGRAM COORDINATORS <br /> Carl Borgman,REHS <br /> Website: www.s ov.or ehd Mike Huggins,RENS, RDI <br /> 18 / <br /> 8 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 /> 28 April 2008 <br /> Endich Estate P. Surinder and Karanti Singh <br /> 1770 Gillis Road 10620 Chantel Ln. <br /> Stockton CA 95215 Stockton, CA 95212-9216 <br /> Subject: Former Top Filling Station <br /> 101 S. Wilson Way <br /> Stockton, California <br /> San Joaquin County Environmental Health Department (EHD) has received and reviewed <br /> Proposal for Additional Soil Investigation (WP) dated 10 January 2008, prepared by Advanced <br /> GeoEnvironmental, Inc. (AGE) on your behalf. The WP was prepared to address issues raised <br /> during a telephonic communication between the EHD and AGE. In the WP, AGE proposes to <br /> advance three soil borings to 40 feet below surface grade (bsg), two borings to further assess <br /> hydrocarbon-impacted soil encountered during removal of underground storage tanks (USTs) <br /> numbers 2 and 3 and one soil boring to evaluate the effectiveness of the operating soil vapor <br /> extraction (SVE) system. The former UST area has not had further assessment of impacted soil <br /> since the USTs were removed. Any of the soil borings yielding significantly impacted soil <br /> samples will be converted to SVE wells and incorporated into the SVE system. AGE proposes <br /> that the well screens of such wells should extend from 10 to 35 feet bsg. <br /> Soil samples will be collected at 5-foot intervals; selected soil samples will be submitted for <br /> chemical analysis for total petroleum hydrocarbons as gasoline (TPH-g), benzene, toluene, <br /> ethylbenzene and total xylenes (BTEX), methyl tert-butyl ether (MTBE), 1,2-dichloroethane (1,2- <br /> DCA), ethylene dibromide (EDB) and the other fuel oxygenates. <br /> The EHD approves the work plan as necessary and adequate [Health & Safety Code (H&S) <br /> Section 25299.37(c)(3)], but recommends that the screen intervals of any borings converted to <br /> SVE wells should be limited to the interval of significantly impacted soil in each boring. Please <br /> implement this approved work plan within 60 days of the date of this letter. Submit a well permit <br /> application with the required $89.00 permit fee and $297.00 inspection fee ($386.00 total) to the <br /> EHD. Provide the EHD with a minimum 48-hour notice prior to initiating any field work. <br /> Your questions and comments should be directed to Nuel Henderson, Engineering Geologist, at <br /> (209)468-3436 or by mail (address on the letterhead). <br /> Nuel C. Henderson, Jr., PG Margaret Lagorio, REHS <br /> Engineering Geologist Program Coordinator <br /> C: Tim Cuellar—AGE—837 Shaw Road, Stockton, CA 95215 <br /> James Barton, PG -CVRWQCB- 11020 Sun Center Dr.#200, Rancho Cordova, CA 95670 <br /> WP Approval Letter 0308.doc <br />