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California&gional Water Quality Cot*l Board <br /> Central Valley Region <br /> Karl E. Longley, ScD, P.E.,Chair ^...:� <br /> Linda S.Adams <br /> 12,cre¢ul.r,,,. 11020 Sun Center Drive#200.Rancho Cordova.C'alilornia 95 70_ II Arnold <br /> I...rranniental Phone(916)464-3291 •FAX(916)464-4645 ���1r�lr�l Schwarzenegg <br /> Vrorection http.//www waterboards.ca.gov/eentralvalleN WSW Governor <br /> JUL 1 4 2009 <br /> 10 July 2009 <br /> ENVIRONMENT HEALTH <br /> PERMIT/SERVICES <br /> Mr. Jeff Baker <br /> Tesoro Companies, Inc. <br /> 3450 South 344th Way, Suite 100 <br /> Auburn, WA 98001-5931 <br /> FIRST QUARTER 2009 SITE STATUS, GROUNDWATER MONITORING AND <br /> REMEDIAL SUMMARYREPORT, STOCKTON TERMINALS TECHNICAL <br /> COMMITTEE FACILITIES, PORT OF STOCKTON, SAN JOAQUIN COUNTY <br /> Regional Water Quality Control Board, Central Valley Region (Central Valley Water <br /> Board) staff reviewed the 30 April 2009 First Quarter 2009 Quarterly Site Status, <br /> Groundwater Monitoring and Remedial Summary Report (First 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 SoakeaseTA° 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 /> first quarter of 2009 between 3 and 5 February 2009. 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 first quarter, Stantec calculated that <br /> groundwater flowed toward the southeast in the A through D zones. The historically <br /> downward vertical gradients between the four hydrostratigraphic units were consistently <br /> downward. During October 2008, a site-wide resurvey of STTC and NuStar <br /> groundwater monitoring wells was conducted. STTC recommends that monitoring wells <br /> on the nearby Kinder Morgan Energy Partners (KMEP) site should also be resurveyed <br /> for consistency. <br /> The First QMR reports that SPH or SPH sheen was observed in two A zone wells at the <br /> 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. As shown on Table 6.. during the first quarter 2009, the highest <br /> California Environmental Protection Agency <br /> c� ae�, rcdr ,f,e,. <br />