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Californi-10egiof>tal Water Quality C1g9§ 10 <br /> L Central Valley Region TV <br /> Karl E. Longley,SeD,P.E.,Chair DEC 1 7 2008 ". <br /> Linda S.Adams <br /> Secreta or 11020 Sun Center Drive#2O0,Rancho Cordova,California 9 Arnold <br /> Environmental Phone(916)464-3291 •FAX(916)464-4645 WR6NM1-1,J ,9EALTH Schwarzenegg <br /> Protection http://www.waterboards.ca.gov/centralvalley M.11VOIT/SERV2ES Governor <br /> 15 December 2008 <br /> Mr. Jeff Baker <br /> Tesoro Companies, Inc. <br /> 3450 South 344th Way, Suite 100 <br /> Auburn, WA 98001-5931 <br /> THIRD QUARTER 2008 SITE STATUS, GROUNDWATER MONITORING AND <br /> REMEDIAL SUMMARY REPORT, STOCKTON TERMINALS TECHNICAL <br /> COMMITTEE FACILITIES, PORT OF STOCKTON, SAN JOAQUIN COUNTY <br /> Regional Water Quality Control Board, Central Valley Region (Regional Water Board) <br /> staff reviewed the 31 October 2008 Third Quarter 2008 Quarterty Site Status, <br /> Groundwater Monitoring and Remedial Summary Report (Third QMR) submitted on <br /> behalf of the Stockton Terminals Technical Committee (STTC) by Stantec Consulting <br /> Corporation (Stantec). STTC is comprised of three bulk fuel facilities at the Port of <br /> Stockton (Site) including British Petroleum (BP) (formerly ARCO), Tesoro Petroleum <br /> Company Inc. (Tesoro), and Time Oil Company. <br /> The principal contaminants of concern (COCs) at the Site include total petroleum <br /> hydrocarbons as gasoline (TPHg), TPH as diesel (TPHd), benzene, toluene, <br /> ethylbenzene, and xylenes (collectively BTEX), tertiary amyl methyl ether (TAME), <br /> methyl tertiary butyl ether (MTBE), and tertiary butyl alcohol (TBA). Since <br /> 20 September 2002, the STTC has utilized SoakeaseTM separate phase hydrocarbon <br /> (SPH) removal socks in four wells to remove SPH. <br /> The STTC conducts monitoring at the Site pursuant to Monitoring and Reporting <br /> Program (MRP) No. R5-2004-0823. Stantec conducted groundwater monitoring for the <br /> third quarter of 2008 between 4 and 7 August 2008. Sediments underlying the Site are <br /> subdivided into four progressively deeper hydrostratigraphic units referred to as the <br /> A Zone, B Zone, C Zone, and D Zone. During the second quarter, Stantec calculated <br /> that groundwater Flowed toward the southeast in the A through C zones and toward the <br /> east in the D zone. The historically downward vertical gradients between the four <br /> hydrostratigraphic units were consistently downward during the third quarter. During <br /> October 2008, a site-wide resurvey of STTC and NuStar groundwater monitoring wells <br /> was conducted as recommended by Geotracker. Due to this change, groundwater <br /> elevations are about two feet higher than previously calculated. <br /> The Third QMR reports that SPH or SPH sheen was observed in two A zone wells at <br /> the Time Oil and Tesoro facilities. Consistent with historical observations, no B, C, or D <br /> zone wells contained SPH. The highest COC concentrations typically underlie the BP <br /> and Time Oil facilities. During the third quarter 2008, the highest COC concentrations <br /> California Environmental Protection Agency <br /> 0 Recycled Paper I <br />