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California <br /> egional Water Quality Control Board <br /> Central Valley Region . <br /> Karl E. Longley, SCD,P.E.,Chair > <br /> Linda S.Adams <br /> Secretaryjar 11020 Sun Center Drive 4200,Rancho Cordova,Cal ifomia 956706114 Arnold <br /> Environmental Phone(916)464-3291 •FAX(916)4644645 Schwarzenegg <br /> Protection http://www.waterboards.ca.gov/centralvalley Governor <br /> 20 August 2009 <br /> Mr. Jeff Baker AUG Z.1 20019 <br /> Tesoro Companies, Inc p�IRON�?ENTHE41H <br /> 3450 South 344th Way, Suitei6RV1CfS <br /> Auburn, WA 98001-5931 <br /> SECOND QUARTER 2009 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 (Central Valley Water <br /> Board) staff reviewed the 31 July 2009 Second Quarter 2009 Quarterly Site Status, <br /> Groundwater Monitoring and Remedial Summary Report (Second 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 (CDCs) 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). Methylene blue <br /> active substances (MBAS) also has been observed in groundwater after monitoring for <br /> this constituent began in March 2009 following a November 2008 release of fire <br /> suppression foam from the BP loading rack. <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 /> second quarter of 2009 between 5 and 8 May 2009. Sediments underlying the Site are <br /> subdivided into four progressively deeper hydrostratigraphic units classified as the <br /> A Zone, B Zone, C Zone, and D Zones. During the second quarter, Stantec calculated <br /> that groundwater flowed toward the southeast in all the zones. The historically <br /> downward vertical gradients between the four hydrostratigraphic units were also <br /> predominantly downward during the second quarter. During October 2008, Stantec <br /> conducted a site-wide resurvey of groundwater monitoring wells at STTC and the <br /> nearby NuStar Energy facility. Despite this resurvey, a local depression remains in a <br /> downgradient groundwater monitoring well at the NuStar site. STTC recommends that <br /> monitoring wells on the nearby Kinder Morgan Energy Partners (KMEP) site should also <br /> be resurveyed for consistency. <br /> California Environmental Protection Agency <br /> �IS Recycled Paper <br />