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PUBLIC HtALTH �'!LECQPY <br /> a�SERVICtS oP.� ....� <br /> SAN JOAQUIN COUNTY <br /> ENVIRONMENTAL HEALTH DIVISION ` <br /> Karen Furst, M.D., M.P.H., Health Officer <br /> 304 East Weber Avenue, Third Floor • Stockton, CA 95202 %Foa <br /> 209/468-3420 <br /> JOIN DAVIS JUN U 12000 <br /> MCDOWELL & DAVIS TOWING <br /> 1360 ESCALON AVE <br /> ESCALON CA 95320 <br /> RE: McDowell & Davis Towing SITE CODE: 1486 <br /> 1360 Escalon Ave. <br /> Escalon CA 95320 <br /> San Joaquin County Public Health Services, Environmental Health Division (PHS/EHD) has <br /> reviewed the "Subsurface Soil Investigation Report"dated March 10, 2000 that was submitted <br /> by M.J. Kloberdanz &Associates (MJK)on behalf of the above referenced site and has the <br /> following comments. <br /> The report documents the subsurface soil investigation that occurred at this site on January 28, <br /> 2000. On that date, four soil borings were advanced by conventional hollow-stem auger drilling <br /> techniques and soil samples for analysis were collected every five feet to a maximum depth of <br /> 40-feet below surface grade (bsg). Analytical results evidenced significant petroleum <br /> hydrocarbon contamination at the 15-foot bsg level in boring B-2, which was located near the <br /> western dispenser island area. Contaminant concentrations were 2,600 parts per million (ppm) <br /> total petroleum hydrocarbons as gas (TPHg), 860 parts per billion (ppb) benzene, 120,000-ppb <br /> toluene, 51,000-ppb ethylbenzene, 400,000-ppb xylene and 87,000-ppb methyl tertiary butyl <br /> ether(MTBE). These concentrations attenuated rapidly with depth, to non-detect results from <br /> both the 35-foot and 45-foot bsg samples. <br /> On March 20, 2000 PHS/EHD reviewed the analytical results from this investigation with a <br /> representative from the Regional Water Quality Control Board, Central Valley Region <br /> (CVRWQCB). The representative indicated that before this site could be considered for a low- <br /> risk closure, a groundwater investigation would have to be conducted. <br /> Please prepare a work plan to conduct a preliminary groundwater investigation at this site and <br /> submit it to PHS/EHD by July 14, 2000. If you have any questions or comments please call Lori <br /> Duncan at (209)468-0337. <br /> Donna Heran, REHS, Director <br /> Environmental Health Division <br /> Lori Duncan, Senior REHS Margaret Lagorio, REHS <br /> LOP/Site Mitigation Unit IV Supervisor, Unit IV <br /> cc: Marty Hartzell, CVRWQCB <br /> Mike Kloberdanz, MJK <br /> A Division of San Joaquin County Health Care Services <br />