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San Joaquin County DIRECTOR <br /> Donna Heran,REHS <br /> :. Environmental Health Department <br /> 1" ASSISTANT DIRECTOR <br /> GLaurie Cotulla, REHS <br /> A ? 600 East Main Street <br /> Stockton, California 95202-3029 PROGRAM COORDINATORS <br /> :. Carl Borgman, REHS <br /> Mike Huggins,REHS, RDI <br /> CQ�!O_Ra�P Website: www Sjgov.org/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 /> August 27, 2008 <br /> Mr. Allen Fetters <br /> Ripon Farm Service Incorporated <br /> 3705 Portsmouth Circle <br /> North Stockton, California 95219 <br /> Subject: Ripon Farm Service Incorporated <br /> 932 East Frontage Road (Formerly 22871 South Highway 99) <br /> Ripon, California 95366 <br /> The San Joaquin County Environmental Health Department (EHD) has reviewed Soil <br /> Vapor Assessment Work Plan dated July 18, 2008, prepared and submitted by Advanced <br /> GeoEnvironmental, Inc. (AGE) on your behalf for the above-referenced site. The work <br /> plan was submitted in response to the EHD letter dated June 20, 2008, directing an <br /> assessment of the potential hazard for vapor intrusion into the existing onsite buildings. <br /> In the work plan, AGE proposes to advance three soil probe borings to total depths of <br /> approximately four feet below ground surface (bgs) using a Geoprobe 5400 direct-push <br /> probing unit at locations illustrated in Figure 2. Soil gas samples will be collected on solid <br /> adsorbent TO-17 tubes for analysis of total petroleum hydrocarbons (TPH) quantified as <br /> diesel (TPH-d), and in Tedlar bags for analysis of TPH quantified as gasoline (TPH-g); <br /> benzene, toluene, ethyl benzene, and total xylenes (BTEX); methyl tertiary-butyl ether <br /> (MTBE), tertiary-amyl methyl ether(TAME), di-isopropyl ether(DIPE), ethyl tertiary-butyl <br /> ether (ETBE), tertiary-butyl alcohol (TBA), 1,2-dibromoethane (EDB), and 1,2- <br /> dichoroethane (1,2-DCA). AGE proposes to check for leak detection by placing a plastic <br /> sheet over the sampling equipment and exposing the ambient air to isopropyl alcohol. The <br /> EHD approves the work plan with minor revisions noted below. <br /> Soil gas samples will be collected at five feet bgs or deeper, instead of the proposed four <br /> feet bgs, at least thirty minutes following the probe installation. Based on the document <br /> titled Advisory Active Soil Gas Investigation dated January 28, 2003, issued jointly by the <br /> Department of Toxic Control (DTSC) and the California Regional Water Quality Control <br /> Board — Los Angeles Region (LARWQCB), Section 2.2.3 states that "soil gas probes <br /> should be installed at a minimum of one sample depth, generally at five feet bgs" and <br /> Section 2.2.1 states that "if the bottom five feet of a continuously cored boring is composed <br />