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Pu. <br /> Bti`C HEALTH StitVICES - <br /> -SAN JOAQUIN COUNTY <br /> JOGI KHANNA;M.D.,M.P.H. <br /> Health Officer <br /> C' P <br /> P.O. Box 2009 . (1601 East Hazelton A3svenue) Stockton,California 95201 <br /> (209) 468-3400 <br /> February 14 ,: 19,90 <br /> San Joaquin County <br /> Department of General Services <br /> 222 E. Weber', Avenue <br /> Courthouse Roow 275 <br /> Stockton, CA- 95202 S <br /> RE: San Joaquin County IN REPLY REFER TO SITE CODE: 1838 <br /> Motor Pool <br /> 444 S. Wilson Way <br /> Stockton, CA 95201 <br /> We have reviewed the Site Assessment Report dated December 22, <br /> 1989 . Based .on the analyticalresu,Its, the report recommends that <br /> no further investigation be conducted at this site. <br /> Contamination (12mg/kg TPH). .was noted at the bottom of soil boring <br /> number five (21 . 5 ft. ) and chromium and zinc contamination was <br /> present in all the soil samples analyzed. The report implies that <br /> the level of contamination in SB5 does not warrant further <br /> .investigation. C <br /> The report also 'states that levelsof chromium and zinc appear to <br /> be, consistent with background soil . concentrations typical of <br /> nothern San Joaquin Valley: Background levels at this site have <br /> not yet been . determined. <br /> This office recommends that an additional soil boring be drilled in F <br /> close proximity to soil boring five, and the California Water f <br /> Service Municipal well on the ' neirghboring parcel, to show the <br /> extent of vertical contamination. A second soil boring in an area - <br /> not suspected of contamination shobld be drilled to demonstrate <br /> background levels of chromium 'and:,' This boring should be <br /> sampled at sufficient depths to confirm the consultant 's statements <br /> in, the report''. <br /> 17 <br /> A Division of San Joaquin County Health Care Services <br />