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PUBLIC HEALTH SEMCES <br /> .o <br /> SAN JOAQUIN COUNTY <br /> ENVIRONMENTAL HEALTH DIVISION <br /> Ernest M. Fujimoto, M.D., M.P.H., Acting Health Officer <br /> 445 N. San Joaquin Street • P. 0. Box 388 • Stockton, CA 9 1-0388 c4�rFo"aa�P <br /> 209/468-3420 <br /> MR TIM GILL <br /> WAGNER LAND COMPANY <br /> P O BOX 690725 17 199F <br /> STOCKTON CA 95269 <br /> RE: Brannon Tire <br /> 540 North Hunter Street <br /> Stockton CA <br /> San Joaquin County Public Health Services, Environmental Health Division (PHS/EHD) has <br /> reviewed the March 21, 1995 letter (the letter) prepared by Anne M. Farr, Ph.D. for the above <br /> referenced site. <br /> The letter describes documentation used in the analysis of data gathered at this site, provides a <br /> brief summary of the UST removal and soil sampling and presents an analysis of the data. The <br /> letter recommends site closure based upon all data obtained to date. <br /> In the section entitled "UST Removal and Soil Sampling" the letter states that soil sampling was <br /> requested by the County due to the detection levels for BTEX for soil samples collected from <br /> the tank excavations being higher than required by the County. Brannon tire complied with this <br /> request and drilled two borings on November 19, 1993. From that subsurface investigation the <br /> letter concludes that the vertical extent of contamination is from 8 feet to 9.5 feet. <br /> PHS/EHD has reviewed the analytical results of the 8 foot sample from the November 19, 1993 <br /> data and has found that TPH as Gas and TPH as Diesel were confirmed as present at 640 and <br /> 1200 ppm respectively. Xylenes at a concentration of 2.7 ppm and Ethylbenzene at a <br /> concentration of .49 ppm were also detected. The letter fails to state that the .1 ppm detection <br /> limit used for Benzene and Toluene in this analysis exceeds the .005 ppm detection limit <br /> recommended in the LUFT manual and the Tri-Regional guidelines. Therefore, the evidence <br /> for the presence or absence of Benzene and Toluene in the eight foot sample at a concentration <br /> of .1 ppm to .005 ppm is inconclusive at this time. <br /> The boring log from November 19, 1993 indicates that there were no hydrocarbon odors below <br /> a depth of 9.5 feet. Evidence indicating that contamination is present below 9.5 feet was <br /> obtained during the tank removal which occurred on May 31, 1988. When the opened tank <br /> excavation was sampled during removal sample 1-WO was obtained from a depth of 13 feet 4 <br /> inches. During the sampling procedure the PHS/EHD inspector noted a hydrocarbon odor <br /> present in the sample. Laboratory analysis of this sample confirmed the presence of Total <br /> Volatile Petroleum <br /> A Division of San Joaquin County Health Care Services <br />