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1117 Lone Palm Avenue <br /> C—y Suite B <br /> Modesto, CA 95351209.5792221 <br /> Fax 209579.2225 S O C I A T E S I N C . <br /> 1: F <br /> .. s <br /> €E J <br /> June 2, 1999 <br /> 17292.0004 <br /> Mr. Jeff Wong <br /> San Joaquin,County Public Health Services <br /> Environmental Health Division <br /> `j 304 E. Weber Street, Third Floor <br /> i Stockton, California 95202 <br /> I <br /> Subject: Subsurface Investigation at the Transportation Center/Corporation Yard, 1932 El <br /> Pinal Drive, Stockton, California <br /> 5 <br /> V) . <br /> Dear Mr. Wong: <br /> ATC Associates Inc. has completed the Subsurface Investigation of the above referenced site. <br /> $. n The attached report summarizes our activities and findings. <br /> { Of the 25 soil samples analyzed during this investigation, none were reported to contain BTEX <br /> constituents above laboratory detection limits. Although soil samples collected from the vicinity <br /> �i <br /> of the remote fill pipeline-contained concentrations of TPHd (ranging from <1.0 to 7.5 ppm) the <br /> laboratory indicated the chromatogram pattern did not match that of a diesel standard. <br /> E Additionally, discrete peaks, which are also•observed on-the chromatograms, may be naturally <br /> occurring organics in the soil. <br /> Soil beneath the location of the former diesel USTs appears to be impacted by total petroleum <br /> hydrocarbons. However,the impacted soil appears to be limited vertically to the upper 35 feet of <br /> the soil column and laterally to a radius of approximately five to ten feet from S133 (as exhibited <br /> ' by sample 597 and borings SB4 and S135). <br /> h <br /> Of the twelve soil samples collected from the vicinity of the former gasoline USTs, none were <br /> reported by the laboratory to contain TPHg, BTEX, or fuel oxygenates above laboratory <br /> r detection limits. <br /> Based on the analytical results, field observations, estimated depth to groundwater (90 feet), and <br /> the fact that the site is capped with asphalt, additional investigation does not appear to be <br /> C. <br /> warranted. <br /> 4 <br />