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California �gional Water Quality Con' 1 Board <br /> Central Valley Region <br /> Karl E. Longley,ScD, P.E.,Chair =" <br /> Linda S.Adams Arnold <br /> ]1020 Sun Center Drive#200,Rancho Cordova,California 95670- Schwarzene er <br /> Secretcayfor Phone(916)464-3291 •FAX(916)464-4645 RECENEDDggEnvironmental Governor <br /> Protection http:/hvww.waterboards.ca.gov/centralvalley <br /> 8 July 2009 JUL 0 9 2009 <br /> ENVIRONMENT HEALTH <br /> PERMIT/SERVICES <br /> Ms. Vicki Goodenow <br /> NuStar Energy L.P. <br /> 2330 North Loop 1604 West <br /> San Antonio, TX 78278 <br /> SUBSURFACE INVESTIGATION WORK PLAN, NuSTAR TERMINALS STOCKTON <br /> FACILITY, 2941 NAVY DRIVE, STOCKTON, SAN JOA QUIN COUNTY <br /> Regional Water Quality Control Board, Central Valley Region (Central Valley Water Board) <br /> staff reviewed the 17 June 2009 Subsurface Investigation Work Plan (Work Plan) submitted <br /> by Ash Creek Associates, Inc. (Ash Creek) on behalf of NuStar Terminals Operating <br /> Partnership L.P. (NuStar) for the NuStar Terminals Stockton Facility located at <br /> 2941 Navy Drive in Stockton (Site). Groundwater monitoring at the Site is conducted pursuant <br /> to Monitoring and Reporting Program (MRP) No. R5-2007-0818. <br /> NuStar and its predecessor have conducted monitoring at the Site since 1992. In 2002, <br /> gasoline releases occurred from aboveground storage tanks (ALTs) G 3301, G 3302, and <br /> D 1503. The principal contaminants of concern (COCs) include total petroleum hydrocarbons <br /> as gasoline (TPHg), TPH as diesel (TPHd), benzene, toluene, ethylbenzene, and xylenes <br /> (collectively BTEX), tertiary amyl methyl ether (TAME), methyl tertiary butyl ether (MTBE), <br /> tertiary butyl alcohol (TBA), and di-isopropyl ether (DIPE). <br /> Groundwater bearing strata underlying the Site have been subdivided into four progressively <br /> deeper units designated as zones A through D by NuStar's predecessors and other <br /> responsible parties at neighboring sites. Based on an investigation conducted by NuStar <br /> during the Fall of 2008, NuStar concluded that these water bearing zones are deeper beneath <br /> the NuStar site and should be renamed accordingly. As such, NuStar has determined that <br /> some of their existing B-zone wells were actually completed in the C-zone, and grab <br /> groundwater samples thought to have been obtained in the B- and C-zones were actually <br /> collected in the C- and D-zones, respectively. <br /> The Work Plan was submitted pursuant to agreements reached between NuStar and Central <br /> Valley Water Board staff in the 21 May 2009 path-forward meeting. At the completion of the <br /> meeting, Central Valley Water Board staff concurred with NuStar's proposal to (1) install <br /> groundwater monitoring wells at proposed locations P-A through P-C, (2) perform lower zone <br /> (about 90 feet below ground surface [bgs]) grab groundwater sampling at locations P-A and <br /> P-C, and (3) conduct a comparative laboratory analysis for TPHd using three variations of <br /> Method 8015 B that will include no filtration, filtration by glass beads, and silica gel cleanup. <br /> California Environmental Protection Agency <br /> Ca Recycled Paper <br />