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Californi egional Water Quality Cool Board <br /> Central Valley Region x 7 <br /> Karl E.Longley,ScD,P.E.,Chair � <br /> Linda S.Adams Arnold <br /> Secretaryfor Sacramento Main Office Schwarzenegger <br /> Environme,oal 11020 Sun Center Drive 9200,Rancho Cordova,California 956706114 Governor <br /> Protection Phone(916)464-3291 -FAX(916)464-4645 <br /> http://www.waterboards.ca.gov/centralval ley <br /> 9 May 2008 <br /> RECENEDD <br /> Mr. Stephan Defibaugh <br /> Kinder Morgan Energy Partners MAY 1 3 22008 <br /> 1100 Town & Country Road ENVIRONMENT HEALTH <br /> Orange, CA 92868 PERMIT/SE9v1GF`; <br /> MONITORED NATURAL ATTENUATION ESTIMATE, KINDER MORGAN ENERGY <br /> PARTNERS, L.P, 2947 NAVY DRIVE, STOCKTON, SAN JOAQUIN COUNTY <br /> Staff of the Regional Water Quality Control Board - Central Valley Region (Regional Water <br /> Board) reviewed the 28 March 2008 Estimated Times For Petroleum Hydrocarbons and Fuel <br /> Oxygenates to Achieve Water Quality Objectives at the SFPP, L.P Stockton Terminal, <br /> Stockton, California (MNA Estimate) submitted by LFR, Inc (LFR) on behalf of SFPP, L.P., <br /> operating partnership of Kinder Morgan Energy Partners (KMEP) for the KMEP terminal at <br /> 2947 Navy Drive in Stockton (Site). The MNA Estimate was submitted in response to our <br /> 29 February 2008 letter, which reiterated our request that future annual monitoring reports <br /> contain an estimate of the time required for groundwater chemical concentrations to reach <br /> water quality objectives (WQOs). <br /> The MNA (Monitored Natural Attenuation) Estimate presents the results of three MNA <br /> parameter sampling events conducted between December 2005 and October 2007. <br /> Regression analyses on concentration trends of benzene, methyl tertiary butyl ether (MTBE) <br /> and total petroleum hydrocarbons as gasoline (TPHg) were performed to predict the year that <br /> these constituents would attain their respective WQOs. Nine monitoring wells were divided into <br /> three categories to represent specific areas of the plume within the project area. SP/M-1 and <br /> SP/M-9 were categorized as manifold area wells. SP/M-3, SP/M-4, SP/M-7, and SP/M-10 were <br /> designated as co-mingled area wells. SP/M-5, SP/M-6 and SP/M-8 were categorized as low- <br /> concentration distal wells. According to LFR, MNA evaluation in conjunction with the <br /> concentration trends shows that biodegradation of petroleum hydrocarbons is occurring. <br /> The 31 January 2008 Combined Semiannual and Annual 2007 Groundwater Monitoring Report <br /> for the SFPP, LP Stockton Terminal (Annual Report) shows that the highest concentrations of <br /> contaminants of concern (CDCs) are generally detected in manifold area wells SP/M-9 and <br /> SP/M-10. During the fourth quarter of 2007, the highest concentrations of benzene, MTBE, <br /> and TPHg in these two wells were 17,000 micrograms per liter (ug/1), 130,000 ug/l, and <br /> 140,000 ug/l, respectively. SP/M-9 contained the highest concentrations of TPHg and MTBE, <br /> while SP/M-10 contained the highest benzene concentration. The groundwater flow direction <br /> was to the east at an average gradient of 0.002 feet per foot (ft/ft). <br /> California Environmental Protection Agency <br /> �a Recycled Paper <br />