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U. <br /> DI <br /> PUBLIC HtALTH Svn <br /> SAN JOAQUIN COUNTY ` za <br /> c X <br /> N.. <br /> ENVIRONMENTAL HEALTH DIVISION <br /> Karen Furst, M.D., M.P.H., Health Officer cq o a;P <br /> 304 East Weber Avenue, Third Floor • Stockton, CA 95202 <br /> 209/468-3420 <br /> py <br /> JOHN DAVIS C (O <br /> MCDOWELL a DAVIS TOWING <br /> 1360 E SCALON AVE JAN 112000 <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) <br /> has reviewed the Work Plan, Subsurface Soil and Groundwater Investigation dated <br /> January 4, 2000 that was submitted by M. J. Kloberdanz&Associates (MJK) on behalf <br /> of the above referenced site and has the following comments. <br /> The work plan proposes to begin the investigation of the petroleum hydrocarbon <br /> contamination at this site with a series of three direct push soil borings to an <br /> approximate depth of 40-feet below surface grade (bsg). In a conversation between <br /> PHS/EHD and MJK on January 10, 2000 it was discussed that the presence of hardpan <br /> soils in this area of Escalon is not conducive to the use of direct push drilling techniques. <br /> It was agreed that the work plan would be amended to include the use of a conventional <br /> hollow-stem auger drill rig to perform this site work. <br /> The analytical results from the soil samples collected following the March 1999 removal <br /> of three underground storage tanks and associated piping indicated two areas of <br /> contamination, the western side of the former tank pit near tanks#1 and #2, and the <br /> western side of the dispenser island area. The work plan proposes to advance one <br /> boring in each of these areas and one boring on the east site of the former tank pit. <br /> These proposed locations would provide information on the vertical extent of the <br /> contamination in the source areas, but will provide information on the lateral extent of the <br /> contamination in one direction only. It is the recommendation of PHS/EHD that more <br /> lateral coverage is considered with this mobilization. <br /> Depth to water in this area of the county is estimated to be approximately 65-70 feet bsg. <br /> In addition to the hardpan, the soil in this area is also known to contain a lot of sand. The <br /> total depth of each boring should extend beyond the proposed 40-foot bsg level if field <br /> observations indicate that contamination is still present at that depth. <br /> A Division of San Joaquin County Health Care Services <br />