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Historic UST Investigation Report <br /> 630 N.California Street <br /> June 1,2011 <br /> Page 4 <br /> Table 2—Laboratory Analytical Results—CAM 5 Metals <br /> Constituent <br /> Sample ID Date Sampled Units: mg/kg (EPA Method 6010B) <br /> Cadmium Chromium Lead FNickel FZinc <br /> Detection Limits (mg/kg): 1.0 1.0 1.0 1.0 5.0 <br /> GPI-16 5/5/2011 <1.0 20 8.3 17 24 <br /> GP2-18 5/5/2011 <1.0 21 7.3 19 17 <br /> GP2-30 5/5/2011 <1,0 17 11 15 19 <br /> Units: mg/kg:milligrams per kilogram,pans per million(ppm). <br /> Cadmium was not detected in any of the three samples analyzed for CAM 5 Metals. Chromium, lead, <br /> nickel, and zinc were detected in all three samples analyzed. All of the metals results are consistent with <br /> background concentrations for these metals. <br /> SUMMARY AND CONCLUSIONS <br /> Condor conducted a subsurface soil sampling event on May 5, 2011 to investigate the potential presence <br /> of a historic UST and associated petroleum hydrocarbon contamination at 630 N. California Street in <br /> Stockton. Based on the field observations and laboratory analytical results, gasoline appears to have been <br /> released to subsurface soil beneath a UST still in place. The laboratory analytical results appear to be <br /> consistent with highly degraded gasoline, as no oxygenates, no benzene, and no diesel or motor oil were <br /> detected. Condor recommends that the UST be removed along with impacted soil to the maximum <br /> practical extent. Groundwater is likely impacted at the Site from the southern adjoining property as well <br /> as from the gasoline release at the Site. If you have any questions or need additional information, please <br /> call Alex Dewitt at(209) 234-0518. <br /> Respectfully submitted, <br /> CONDOR EARTH TECHNOLOGIES,INC. `0IAAI GF <br /> o` <br /> k� O <br /> O 6? <br /> i ALEXANDER 8.DEWITT � <br /> Alexander B. Dewitt,CA PG No. 7502 <br /> No. . <br /> Environmental Services Manager <br /> Attachment A Op CA��FO <br /> Figure 1. Vicinity Map <br /> Figure 2. Site Map <br /> Figure 3. Laboratory Analytical Results <br /> Attachment B <br /> Boring Logs <br /> Attachment C <br /> Laboratory Analytical Reports with COCl <br /> P:\5000_pd\5960 SIC UST RFQ\59606 County of San Joaquin - Records Center\Reports\report\Historic UST Investigation Report\R <br /> 20110601.doc <br /> CONDOR <br />