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0 Cafiforniaf egional Waterluality contrrr�Board ' � <br /> Central Valley Region <br /> Karl E.Longliey,ScD,EE.,Chair <br /> Linda S.AdamsArnold <br /> 11020 Sun Center Drive#200,Rancho Cordova,California 95670-6114 Schwanenegger <br /> Secretaryfor Phone(916)464-3291 •FAX(916)464-4645 <br /> Environmental Protection hap//, w .waterboards.ca.gov/centralvalley ��1r��Ir��4//F/l/,��u,�,,IE M Gm�ernor <br /> 111JI�V�� U �� <br /> 18 February 2009 FEB 2 0 2009 <br /> ENVIRONMENT HEALTH <br /> DESJC, M.BENSON PERMIT/SERVICES <br /> Defense Distribution Depot San Joaquin <br /> P.O. Box 960001 <br /> Stockton, CA 95296 <br /> REVIEW OF DRAFT SECOND FIVE-YEAR REVIEW REPORT FOR DEFENSE LOGISTICS <br /> AGENCY, DEFENSE DISTRIBUTION DEPOT SAN JOAQUIN— SHARPE SITE <br /> California Regional Water Quality Control Board, Central Valley Region (Regional Water <br /> Board) staff has reviewed the Defense Distribution Deport (DDJC)Draft Sharpe Second Five- <br /> Year Report (Draft Report), dated 12 December 2008. The Draft Report was prepared by URS <br /> Corporation on behalf of Defense Logistics Agency Enterprise Support San Joaquin, California <br /> (DESJC) for the DDJC Sharpe site. <br /> Regional Water Board staff considers the Draft Report to be a good review and evaluation of <br /> the actions taken during the second five-year review period between 2003 and 2007. Also, <br /> staff concurs with the recommendations and follow-up actions presented in the Draft Report. <br /> Comments presented below focus on statements within the Draft Report that should be <br /> included or modified for clarity and consistency. <br /> Comments <br /> 1. The period covered by the Draft Report should be stated in Section ES.O of the Executive <br /> Summary and in the opening paragraph of the Introduction. The period is not defined in <br /> the draft report until the second page of the Introduction. <br /> 2. Findings and issues presented in the Draft Report include the following: <br /> a) A portion of the South Balloon plume is beyond the capture zones of existing on-depot <br /> extraction wells. <br /> b) The constituents of concern (COCs) in the North Balloon may be migrating vertically to <br /> depths greater than the existing extraction system due to downward vertical gradients. <br /> Certain protectiveness statements made throughout the Draft Report regarding the threat <br /> posed by offsite migration of CCts in groundwater should be removed or modified. Such <br /> statements include the first sentence in the second paragraph of Section ES.2.1: <br /> "Even though these plumes may migrate beyond the western or northern depot <br /> boundaries, preliminary HydroPunch data from the 2007/2008 CPT/HydroPunch <br /> California Environmental Protection Agency <br /> CY Rerycled Paper <br />