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samples were reported to be below analytical laborator3 detection limits and the Chrome III <br /> analytical results were reported as 14 and 26 mg/kg for samples HH-SB-1-11.0-11.5 and HH-SB- <br /> 1-16.0-16.5,respectively. These concentrations are not considered as hazardous under the <br /> California Code of Regulations. Analytical laboratory reports are attached to this report. <br /> Conclusions <br /> The information obtained from the cuttings and soil sa ples collected from the soil boring is <br /> summarized as follows: (1) lithologies present below tf,e former tank site is comprised primarily <br /> of fine to coarse-grained sand; (2) lithology confirms with previous described geologic units for <br /> the Lodi area in the upper 40 feet of the subsurface; an (3)no evidence of vertical migration of <br /> petroleum hydrocarbons were found to be present belo 7.5 feet below ground surface. <br /> San Joaquin County Public Works Department prepared a groundwater surface elevation map.in <br /> 1998 that depicted the depth to top of groundwater surface at approximately -10 feet mean sea <br /> level. The ground surface elevation at the site is approximately 50 feet above mean sea level. At <br /> least 45 feet of uncontaminated soil remains below the former UST site and the top of the <br /> groundwater table. <br /> We recommend this site for closure based on the fact that no petroleum hydrocarbons were found <br /> in the subsurface below the former UST location. <br /> Please contact me if you have any questions at (209) 369-9421. Thank you for your assistance on <br /> this project. <br /> NC qA E.EF)/N� <br /> Sincerely, <br /> co <br /> ¢ ro <br /> NO. 4 9 <br /> Data40,o <br /> Stephen G. Muir <br /> Certified Engineering Geologist#1224 <br /> Expiration Date: 08/30/02 <br /> 4 <br />