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PUBLIC H5ALTH SERVICE06S <br /> m.P�u1H- <br /> SAN JOAQUIN COUNTY <br /> ENVIRONMENTAL HEALTH DIVISION ` <br /> Karen Furst, M.D., M.P.H., Health Officer �. •:P <br /> q`%P o•R�� <br /> 304 East Weber Avenue, Third Floor • Stockton, CA 95202 <br /> 209/468-3420 <br /> JOHN & MAXINE FERRAIOLO 'JUL 2 4 2000 <br /> PO BOX 757 <br /> LODI CA 95241 <br /> RE: HARRY'S AUTO MART SITE CODE: 1306 <br /> 2662 N WILSON WY <br /> STOCKTON CA 95205 <br /> San Joaquin County Public Health Services,Environmental Health Division (PHS/EHD) <br /> has reviewed Subsurface Inzestigation Report(the report) dated April 12,2000 prepared by <br /> Ground Zero Analysis,Inc. (Ground Zero) for the above referenced site. A monitoring well <br /> (MW-1) was installed with screen section set at 45 feet below surface grade (bsg) to 65 feet <br /> bsg with the top of the sand pack sitting at 43 feet bsg at the site. Depth to water was 42.16 <br /> feet bsg before purging of the well, and gradient direction was from northeast to southeast <br /> based on recent information from a neighboring site. Analytical results of the water sample <br /> collected from MW-1 after its development were 240,000 parts per billion (ppb) of Total <br /> Petroleum Hydrocarbons as gasoline (' H g),25,000 ppb of Benzene, 34,000 ppb of <br /> Toluene, 11,000 ppb of Ethylbenzene, and 44,000 ppb of Xylenes (BTEX collectively). The <br /> 5 oxygenates were not detected in the water sample using EPA Method 8260,but the <br /> detection limit was 50 ppb for all the oxygenates except tert butanol (TBA) which was 500 <br /> ppb. Analytical results of the soil sample collected from soil boring# 1 (SB-1) at 45 feet bsg <br /> were 3,200 parts per million (ppm) of TPH g, and 2.7 ppb, 120 ppb, 64 ppb,290 ppb of <br /> BTEX,respectively, and at 80 feet bsg were not-detect at 1.0 ppm of TPH g, and had <br /> detections of 0.005 ppb,0.028,0.015 ppb,and 0.079 ppb of BTEX, respectively. Analytical <br /> results of the soil sample collected from SB-2 at 30 feet bsg were 810 parts per million (ppm) <br /> of TPH g, and 0.86 ppb,4.8 ppb,5.3 ppb,27 ppb of BTEX,respectively. The report <br /> concluded that the soil contamination does not appear to be present below 80 feet bsg. <br /> PHS/EHD agrees with the report's recommendation for additional work to delineate the <br /> lateral extent of the contaminant plume. PHS/EHD does not agree that the vertical extent <br /> of the soil contamination is defined. Only one soil sample (at 80 feet bsg) was analyzed <br /> between 45 feet bsg and 80 feet bsg. Depth to water in MW-2 at a neighboring site,Moving <br /> Center(U-Haul) at 2701 North Wilson Way,was 77.64 feet bsg in January 1992 according to <br /> P7 ect Status Report dated May 12, 1992 prepared by ETS Environmental&Associates. <br /> Historically the greatest depth to water-in the area was approximately 80 feet bsg according <br /> to San Joaquin Flood Control and Water Conservation District publication of lines of equal <br /> depth of water wells in Fall 1993. The vertical extent of the soil contamination should be <br /> defined by at least two consecutive samples at five feet intervals that are non-detect for <br /> analytes. Consideration should be taken to prevent contaminated groundwater from cross- <br /> contaminating the soil samples in future collection endeavors. <br /> A Division of San Joaquin County Health Care Services <br />