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Eum Nu G. BMUWN JH. <br /> 00�"�ft <br /> rFcEIVED T OOvertncH <br /> CPL 1 R O P N.• Jv 3 /�O�� 5[G EThgv FOPDRIOUE2 <br /> Water Boards 1 L ENVINONM6NTrtl PROTECTION <br /> N <br /> Central Valley Regional Water Quality CoRtA611 c 148qVrHCSS <br /> 21 May 2013 <br /> Michael N. Oliphant <br /> Chevron Environmental Management Company <br /> 6001 Bollinger Canyon Road <br /> P. O. Box 6012 <br /> San Ramon, CA 94583 <br /> REVIEW—SOIL INVESTIGATION WORKPLAN, FORMER TRACY PUMP STATION, 14821 <br /> WEST GRANTLINE ROAD, TRACY, SAN JOAQUIN COUNTY <br /> Chevron Environmental Management Company (Chevron) submitted the Soil Investigation <br /> Workplan (Workplan) for the former Tracy Pump Station dated 10 May 2013. The Workplan was <br /> prepared for Chevron by Science Applications International Corporation Energy, Environment & <br /> Infrastructure, LLC (SAIC) and submitted to Central Valley Regional Water Quality Control Board <br /> staff(Staff)for review and comment. <br /> Previous site investigative findings identified crude oil affected soil including an area of separate <br /> phase oil (SPO) near a fenced area of the site northwest of the former pump house. The purpose <br /> of the Workplan is to confirm the extent of the potential near-surface SPO seep previously identified <br /> using a geophysical evaluation to approximate the outline. The Workplan proposes up to ten soil <br /> borings based on the results of the geophysical investigation. Soil cuttings from the borings would <br /> be visually inspected for the presence of residual hydrocarbons. Final boring locations would be <br /> placed depending on the visual observations. Soil samples would not be collected for chemical <br /> analysis. An investigation report describing the findings and recommendations would be submitted. <br /> Staff concurs with the proposed Workplan. <br /> If you have any questions please contact Dean Hubbard at (559) 445-5179 or by email at <br /> dhubbard(a-)_waterboards.ca.gov. <br /> DANE S. JOHNSON <br /> Senior Engineering Geologist <br /> P.G. No. 4239 <br /> cc: San Joaquin County EHD, Stockton <br /> Michael Hurd, SAIC, Oakland <br /> KAnL E. LONGLEY $c D, P.E., CIIAIn I PAMELA C. CnnooN P.E., EICEE, rxcCLl7IVE Orriom <br /> 1685 C Street,Fresno.CA 93706 1 www.waterboarcJs.ca.gov/centralvalley <br /> C. nECrc LED rnrtH <br />