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i a <br /> Chevron Environmental Management Company Page 3 <br /> Chevron Station 9-8264 3775 Tracy Boulevard Tracy,California Janua 17 2003 <br /> TPHd was detected in five groundwater samples at concentrations ranging from <br /> . 64 micrograms per liter (µg/1) in the sample from CPT-2 at 25 feet bgs to 290 <br /> µg/1 in the sample from CPT-4 at 24 feet bgs MtBE was detected in four <br /> groundwater samples at concentrations ranging from 0 9 µg/1 in the sample from <br /> CPT-3 at 15 feet bgs to 11 µg/1 in the sample from CPT-4 at 24 feet bgs No <br /> other analytes were detected above the laboratory method detection limits <br /> If there are any questions regarding the contents of this report,please call Brian Silva of <br /> SECOR at (916) 861-0400 extension 240 or Robert (Bob) Cochran of Chevron at (925) <br /> 842-9655 <br /> Sincerely, <br /> SECOR International Incorporated <br /> I otenhuis Brian A Silva <br /> Staff Scientist Project Manager <br /> Attachments Table 1 --- CPT Groundwater Analytical Data <br /> • <br /> Figure 1 — Site Location Map <br /> Figure 2— Site Plan <br /> Figure 3 —CPT Groundwater Chemical Concentrations Map <br /> Attachment A— Summary of Previous Investigations <br /> Attachment B —Field And Laboratory Procedures <br /> Attachment C— Cone Penetration Test Data <br /> Attachment D— Laboratory Analytical Reports and Cham-of-Custody <br /> Documentation <br /> cc Robert J Cochran, Chevron Environmental Management Company, San Ramon, <br /> CA <br /> Marty Hartzell, RWQCB —Central Valley Region, Sacramento, CA <br /> Joe Neely, Cambria Environmental, Sonoma, CA <br /> I 1Chevron1982641REPORTSICPT siteassessment doe <br />