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PUBIC HEALTHSEiVICES oP. ...� <br /> SAN JOAQUIN COUNTY r: <br /> /\ . <br /> JOGI KHANNA M.D.,M.P.R. tot <br /> Health Officer <br /> P.O. Box 2009 . (1601 East Hazelton Avenue) i,tockton,California 95201 c4�ji, <br /> (209) 468-3400 <br /> u <br /> 'i <br /> February 14 , 1990 <br /> 'C <br /> San Joaquin County <br /> II <br /> Department of General Services ` <br /> 222 E. Weber Avenue <br /> Courthouse Room 275 <br /> Stockton, CA 95202 { <br /> RE: San Joaquin County IN REPLY REFER TO SITE CODE: 1838 I <br /> Motor Pool ' <br /> 444 S. Wilson Way ; <br /> Stockton, CA 95201 <br /> I� <br /> We have reviewed the Site Assessment Report dated December 22 , j <br /> 1989 . Based on the analytical results, the report recommends that <br /> no further investigation be conducted at'� this site. <br /> i <br /> Contamination (12mg/kg TPH), was noted atllthe 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. y <br /> The report also states that levels of chromium and zinc appear to <br /> be consistent with background soil concentrations typical of <br /> northern San Joaquin Valley. Background ' levels at this site have <br /> not yet been determined. <br /> l This office recommends that an additional Il�soil boring be drilled in <br /> close proximity to soil boring five, and the California Water <br /> Service Municipal well on the neighboring parcel, to show the <br /> extent of vertical contamination. A second soil boring in an area <br /> not suspected of contamination should be drilled to demonstrate <br /> background levels of chromium and zinc. ' This boring should be <br /> i sampled at sufficient depths to confirm the consultant ' s statements <br /> in the report. I <br /> 'b f <br /> 00 f , t <br /> A Division of San Joaquin County Health Care Services <br />