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• � /...JfJ.� �Iln`„I,rc. oa.wll.l H. <br /> Mnrnica Hooaiau¢ <br /> Water Boards <br /> Central Valley Regional Water Quality Control Board RECEIVED <br /> OCT 16 2012_ <br /> 15 October 2012 <br /> ENVIRONMENTAL HEALTH <br /> PERMIT/SERVICES <br /> Mr. Mark Chandler <br /> Time Oil Company <br /> 2737 West Commodore Way <br /> Seattle, WA 98199 <br /> SITE CHARACTERIZATION REPORT, TIME OIL STOCKTON TERMINAL, 3015 NAVY <br /> DRIVE, STOCKTON, SAN JOAQUIN COUNTY <br /> California Regional Water Quality Control Board, Central Valley Region (Central Valley Water <br /> Board) staff reviewed the 27 September 2012 Site Characterization Report(Report) submitted <br /> by Environmental Technologies Group (ETG) on behalf of TOC Holdings Co. (TOC) for the <br /> former Time Oil Company terminal at 3015 Navy Drive in Stockton (Site). TOC is part of the <br /> Stockton Terminals Technical Committee (STTC), which is responsible for addressing the <br /> dissolved plume beneath the Site. <br /> The Site operated as a bulk petroleum fuel storage facility from sometime prior to 1968 until <br /> 1996 and is currently operated by NuStar Energy (NuStar) for the storage and distribution of <br /> ethanol fuel. Two aboveground storage tanks (AGTs) used to store ethanol are located inside a <br /> concrete bermed, unpaved tank farm at the southern portion of the Site. In 2010, NuStar <br /> removed five AGTs that were formerly used to store unleaded regular gasoline, regular leaded <br /> gasoline, unleaded premium gasoline, and aviation fuel. <br /> In July 2012, Time Oil drilled 45 soil borings and installed 16 monitoring wells in the B, C, and D <br /> aquifer zones. The soil borings and monitoring wells were installed to better define the soil and <br /> groundwater contamination at the Site. The maximum soil concentrations were detected around <br /> the inactive overhead loading racks and pump manifold; the southwest corner of the Site; and in <br /> the central portion of the tank farm area. TOC estimates the mass of petroleum hydrocarbons <br /> remaining in the vadose zone is about 66,600 pounds and the amount remaining in groundwater <br /> beneath the Site is about 140 pounds. <br /> Groundwater monitoring and sampling at the Site is conducted by the STTC in accordance with <br /> Monitoring and Reporting Program (MRP) No. R5-2001-0813. TOC and the STTC need to <br /> begin sampling the new monitoring wells quarterly in accordance with the MRP and present the <br /> results in future quarterly monitoring reports. <br /> KARL E. LONGLEY SCD, P.E.. CHAIR PAMELA C. CRCCnoH P.E., BCEE. E%CCVrIVF OrPCER <br /> 11020 Sun Cnnter Drive 0200,Ranch.Cortl.va.CA 05670 ww.walarb.artls.ca.g.v/canimlvaliey <br /> Cd.rcron-n a.rre <br />