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PUBLIC HEALTH SERVICES <br /> SAN JOAQUIN COUNTY <br /> ENVIRONMENTAL HEALTH DIVISION " ° Z< <br /> Karen Furst, M.D., M.P.H., Health Officer <br /> 304 East Weber Avenue, Third Floor • Stockton, CA 95202 <br /> 209/468-3420 <br /> PAT MEEKS <br /> KEVIN MEEKS <br /> PACIFIC AUTO CENTER <br /> 25355 HWY 99 <br /> ACAMPO CA 95220 <br /> DEC 011999 <br /> RE: PACIFIC AUTO CENTER SITE CODE: 508378 <br /> 25355 HWY 99 <br /> ACAMPO CA 95220 <br /> Background <br /> Three underground storage tanks (UST) were removed at the above-referenced site in <br /> 1978. No soil samples were collected at the time of the UST removal. A site <br /> assessment project was conducted between January 25, 1999 and February 25, 1999 by <br /> Advanced GeoEnvironmental, Inc. (AGE). Analytical results of a grab groundwater <br /> sample collected at 77 feet below surface grade (bsg) from Boring #1 (B-1) in the <br /> vicinity of the former USTs were 13 parts per million (ppm) of Total Petroleum <br /> Hydrocarbons as gasoline (TPH-g), and 262 parts per billion (ppb), 1,471 ppb, 672 ppb, <br /> and 3,618 ppb of Benzene, Toluene, Ethylbenzene, and Total Xylenes (BTEX), <br /> respectively. The site was subsequently placed in the Local Oversight Program (LOP) <br /> for oversight of the investigation and remediation of the petroleum hydrocarbon <br /> contamination at the site. <br /> Five borings were drilled and 3 monitoring wells (MW) were installed between <br /> February 26, 1999 and March 11, 1999. Analytical results of the groundwater samples <br /> collected from B-3/MW-2 were 41,000 ppb TPH-g, 280 ppb, 1,700 ppb, 430 ppb, and <br /> 5,600 ppb BTEX, respectively, and 47 ppb Tert-Butyl Alcohol (TBA), and from <br /> B5/MW-3 were 37,000 ppb TPH-g, 600 ppb, 1,900 ppb, 170 ppb, and 6,200 ppb BTEX, <br /> and 18 ppb TBA as reported in the Preliminary Investigation and Evaluation Report <br /> dated April 7, 1999 prepared by AGE. The vertical and lateral extent of contamination <br /> has not been determined at this site. A domestic well of unknown construction is <br /> located approximately 34 feet north of the former UST location. A water sample from <br /> the domestic well was collected for analysis, but analytical results were not included in <br /> the report. On October 1, 1999, San Joaquin County Public Health Services, <br /> Environmental Health Division (PHD/EHD) was informed by AGE that due to a <br /> financial dispute with the property owner they will not provide any more sample <br /> results or perform any further sampling of the monitoring wells. <br /> A Division of San Joaquin County Health Care Services <br />