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Californi:«egional Water Quality Cool Board .>: <br /> Central Valley Region <br /> Karl E. Longley,Scn,P.E.,Chair �O a <br /> Linda S.Adams 11020 Sun Center Drive#200,Rancho Cordova,California 95670-6114 <br /> Smental Pror Phone(916)464-3291 •FAX p Arnold <br /> Environmental Proleclion (916)464-0645 VE(�Sch Wevern r <br /> egg <br /> http;//www.weterboards.ca.gov/centralvalley U Governor <br /> JUL 1 5 2009 <br /> 13 July 2009 ENVIRONAIENT <br /> 116, <br /> PERMIT/SERVITH <br /> E8 <br /> Mr. Sergio Morescalchi <br /> Atlantic Richfield Company <br /> P.O. Box 1257 <br /> San Ramon, CA 94583 <br /> FEASIBILITY STUDY WORK PLAN, ARCO/BP STOCKTON FUEL TERMINAL #40T, <br /> 2700 WEST WASHINGTON STREET, PORT OF STOCKTON, SAN JOAQUIN <br /> 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 /> Table 6 of the first QMR includes the results of groundwater sampling, conducted on <br /> 19 March, for methylene blue active substances (MBAS), a constituent of fire <br /> suppression foam. In a 17 March 2009 letter, Central Valley Water Board staff <br /> requested that BP conduct sampling for this parameter to assist in evaluating the effects <br /> of a November 2008 fire suppression foam release. BP responded to our comments in <br /> the 29 April 2009 Response to RWQCB Letter Dated March 17, 2009 (Letter). <br /> Response No. 3 in the Letter explains that the samples were collected as "grab" <br /> samples from select monitoring wells. <br /> The select monitoring wells included AR/MW-5A, AR/MW-5C, AR/MW-13C, and <br /> AR/MW-14B. These wells are located within BP's above ground tank (AGT) secondary <br /> containment structure. The secondary containment structure was used to contain the <br /> mixture of released suppression foam and the water used to wash it away from the <br /> loading rack area. The laboratory analytical results showed that MBAS was detected at <br /> concentrations ranging from 210 micrograms per liter (pg/L) in the A zone to 2,300 pg/L <br /> in the C-zone. The water quality objective for MBAS is 500 pg/L. Although BP does <br /> directly address the MBAS monitoring results in the First QMR, they attribute historically <br /> high petroleum hydrocarbon levels to the November 2008 fire suppression foam <br /> release. The Letter states that MBAS monitoring will be conducted through the 4th <br /> quarter of 2009. <br /> California Environmental Protection Agency <br /> ped Recycled Paper <br />