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►ua <br /> Tonal Water Quality C <br /> Linda S.Adams Central Valley Re q'ol Board <br /> Acting Secretary for Kath glon <br /> Environmental 11020 Su Katherine Hart, <br /> Chair <br /> Protection n Center Drive#200,Ranch <br /> (916)464.3291. o Cordova Calico95670- , <br /> htip://www Ovate FA'(916)464-4645 mia -6114 „ <br /> 1 7 Fe boards.ca. <br /> February 2011 gO°/oentralvalley �/�A�I Edmund G.Brown J <br /> RECEIVED <br /> VCDmor <br /> Mr. Jeff Baker FEB 2 2 20111 <br /> Tesoro Companies, Inc. <br /> 3450 South 344 EN PERMITSERVICESL� <br /> Auburn, WA 98001-a9 Suite 100 <br /> 5931 <br /> FOURTH <br /> QUARTER <br /> MONITORING AND 2010 ANNUAL S/TE rUS, GROUNDWATER <br /> TECHNICAL COMM/TTEE pO SUMMARYREPORT <br /> STOCKTON TERM/NALS <br /> RT OF STOCKTON <br /> Regional Water Qualityr SAN✓OAOU/N COUNTY <br /> Board) staff reviewed the 31 Control <br /> Board, Central Valle <br /> Status, Groundwater Monitoring January 2011 Fourth y Region (Central Valley Water <br /> submitted on behalf of the Stockton Terminals <br /> Sul Quarter and I 0io(An Annual Site <br /> rminals Technical I✓ommi (Annual Report) <br /> Consulting Corporation (Stantec . mittee (STTC <br /> STTC is comprised of three bulk fuel facilities at the <br /> Port of ec <br /> Company Inc. (Tesoro),including drFormeetroleu oil Company <br /> ARCO <br /> collectively referred to ) the Site. Durimeing p Y (FTOC).)' Tesoro Petroleum <br /> informed Central Valley Water Board staff that NuStar will soon occupy terminals are <br /> g a meeting on 13 October 2010, the STTC <br /> and utilize it to store ethanol. FTOC will retain the liability for soil and groundwater <br /> cleanup. the FTOC site <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 /> was not conducted prior to the release. However, monitoring for this constituent <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 /> fourth quarter of 2010 between 1 and 5 November 2010. Sediments underlying the Site <br /> are subdivided into four progressively deeper hydrostratigraphic units classified as the <br /> A Zone, B Zone, C Zone, and D Zone. During the fourth quarter, depth to groundwater <br /> ranged from about two to 11 feet below ground surface (bgs). Groundwater flowed <br /> toward the southeast in all the zones at gradients ranging from 0.002 to 0.006 feet per <br /> foot. The historically downward vertical gradients between the four hydrostratigraphic <br /> units prevailed during the fourth quarter and ranged from 0.003 to 0.067 feet per foot. <br /> r,d11tj 1y 1iaEnVIranmental Protection Agency <br /> n?'ecydet'•Paper <br />