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HEALTH SERVICESPUBLIC <br /> SAN JOAQUIN COUNTY W <br /> ENVIRONMENTAL HEALTH DIVISION " ` ` <br /> Karen Furst, M.D., M.P.H., Health Officer . ; - <br /> ���FOR�` <br /> 304 East Weber Avenue, Third Floor • Stockton, CA 95202 <br /> 209/468-3420 R - <br /> DALE BOYETT <br /> BOYETT PETROLEUM �, , p <br /> P O BOX 1099 DEC G 1 X9.,8 <br /> SALIDA CA 95368 <br /> Re: BOYETT PETROLEUM Site Code: 1433 <br /> 419 S. MAIN ST. <br /> MANTECA CA 95336 <br /> San Joaquin County Public Health Services, Environmental Health Division <br /> (PHS/EHD) has reviewed "Underground Storage Tank Preliminary Investigation <br /> Report of Findings" dated October 23, 1998 prepared by WHF, Inc. Two Geo- <br /> ProbeO soil borings (SB) were advanced to approximately 18 feet below grade level <br /> (bgl) on October 5, 1998. Depth to groundwater was at approximately 18 feet bgl. <br /> Grab water and 3 soil samples per boring were collected for laboratory analyses. <br /> Analytical results of all soil samples were non-detect (ND) at 5 parts per billion (ppb) <br /> or above for Benzene, Toluene, Ethyl-Benzene, and Xylenes (BTEX), and ND at 1.0 <br /> parts per million (ppm) or above for Total Petroleum Hydrocarbon as gasoline (TPH- <br /> g). However, analytical results of soil samples taken at 16 feet bgl were 600 ppb <br /> methyl tert-butyl ether (MTBE) for SB1, and 4,700 ppb MTBE for SB-2 soil. In <br /> addition, results of both bore-hole grab water samples were 47,000 ppb and 6,700 ppb <br /> MTBE for SB-1 and SB-2, respectively. <br /> PHS/EHD disagrees with the report statement that the "contamination problem is <br /> waterborne". Analytical results of soil samples previously collected from the dispenser <br /> area at 2 feet bgl on November 20, 1996 indicated petroleum contamination in the soil <br /> including aromatic hydrocarbons as toluene, ethylbenzene, xylenes, and oxygenate as <br /> MTBE in the soil. Analytical results of the stockpile soil samples collected on <br /> November 20, 1996 also indicated the presence of petroleum contamination, including <br /> TPH-g, toluene, ethylbenzene, and xylenes. MTBE was detected at 1,100 ppb in both <br /> soil stockpile samples. Since each stockpile sample analyzed at the laboratory was <br /> composited using two soil samples collected on site, the analytical result may be <br /> diminished. Therefore, there is contamination in the soil as shown by the November <br /> 1996 sampling. <br /> PHS/EHD disagrees with the report conclusion that the MTBE contamination is from <br /> an off site location. There is currently not enough data to support this conclusion. <br /> The site has not been properly characterized vertically or horizontally. Investigation <br /> A Division of San Joaquin County Health Care Services <br />