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Wright <br /> Environmental <br /> Services, Inc. W <br /> Construction ♦ Engineering # Remediation <br /> JUL p 2 2004 <br /> June 28,2004 ENVIRON <br /> Project No. 9111 (rev.1) MENT HEALTH <br /> PPPMIT/SERVICES <br /> Ace Tomato Co.,Inc. <br /> 2771 East French Camp Road <br /> Mantica,California 95336 <br /> Attn.: Mr. Dean Janssen <br /> Re: Preliminary Soil and Groundwater Site Assessment <br /> Site at 2771 East French Camp Road, Mantica, CA (SITE CODE 0001557) <br /> Dear Mr. Janssen, <br /> Wright Environmental Services,Inc. (Wright) has prepared this workplan for the above referenced <br /> site. The proposed work is in response to a letter dated April 14, 2004 from the San Joaquin <br /> County Environmental Health Department (SJC EHD) for additional subsurface site assessment. <br /> Two underground petroleum fuel storage tanks occur on-site: one 6,000-gallon Diesel and one <br /> 6,000-gallon Gasoline. The disperkrs occur at the ends of the tanks. <br /> This subsurface work is being proposed to address locally elevated contaminants on-site, <br /> specifically in the immediate vicinity of a gasoline pump dispenser fill bucket. Since Methyl-Tert- <br /> Butyl Ether (MTBE) and Tert Butyl Ether (TBA) were present SJC PHD desires additional <br /> subsurface sampling at this time in and around this location and subsurface tanks beyond that <br /> originally proposed in the immediate vicinity of the dispenser. This workplan revises the original <br /> Wright workplan dated March 17,2004. <br /> Scope of Work Tasks and Technical Approach <br /> The technical approach to this project is drill and sample four exploratory borings that will be <br /> placed at the locations shown on Figure 1. A brief review of 1996 regional depth to groundwater <br /> maps prepared by the County of San Joaquin Planning Department (Flood Control and Water <br /> Conservation District) indicates groundwater occurs at depths of about 25 to 30 feet flowing <br /> westerly in the site area. This approach will allow for a relatively rapid subsurface reconnaissance <br /> by collecting and chemically analyzing the vadose soil and uppermost aquifer groundwater samples. <br /> The data from these borings will be used to initially interpret contaminant extent and evaluate the <br /> need and approach of site cleanup. <br /> One boring will be placed as close to the underground tank fill box and dispenser as feasible <br /> (where the contaminant leakage was observed)and up to four soil samples for vertical soil profiling <br /> will be selected on the basis of field evidence of contaminant presence, and one groundwater sample <br /> will be analyzed for presence of contaminants. The three more distant borings will collect a soil <br /> sample near the capillary fringe and one groundwater sample for chemical analysis at surmised <br /> downgradient flow directions for chemical analysis from each of those three boreholes. <br /> 67 E. 10th Street • Tracy,CA 95376 Page t of 3 <br /> 209.833.0758 • Fax 209.832.5152 <br /> wrighf@inreach.com Lic. #651501 A-BHazMat ZA� <br /> websit http://home.inreach.com/wright <br />