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California "egional Water Quality Cor �)l Board <br /> Central Valley Region <br /> a <br /> Karl E. LongleN, Se D, P.E., Chair <br /> Linda S. Adams Arnold <br /> ��"nrrirr i„r I 1020Sun('rntrr 1)me#200. Rancho Cordova.California 9567(161 I4 Sehwarzene <br /> Phone(916)464-3291 • FAX 19161 464-4645 gg <br /> rn rruunrrnl <br /> !r,rru,r hnpihv\c\s \Naterboar&ca-go\Ice ntralvalle\ Governor <br /> 1 June 2009 <br /> JUN 0 2 2009 <br /> Ms. Shelby <br /> ENVIRONMENT HEALTH <br /> y Lathro p PERN1171SERVICES <br /> ConocoPhillips Company <br /> 76 Broadway <br /> Sacramento, CA 95818 <br /> REVISED SCHEDULE AND FIRST QUARTER 2009 STATUS SUMMARY REPORT, <br /> FORMER TOSCO BULK TERMINAL #10013, 3505 NAVY DRIVE, STOCKTON, SAN <br /> JOAQUIN COUNTY <br /> California Regional Water Quality Control Board, Central Valley Region (Central Valley <br /> Water Board) staff reviewed the 29 April 2009 Revised Field Work Schedule (Schedule) <br /> submitted by Stantec Consulting Corporation (Stantec) on behalf of the ConocoPhillips <br /> Company (ConocoPhillips) for the former Tosco bulk fuel terminal at 3505 Navy Drive in <br /> Stockton (Site). NuStar Energy currently owns and operates the Site. <br /> The Schedule proposes to delay installation of eight shallow zone (IP-01 through IP-08) <br /> and three deep zone (IP-10 through IP-12) wells at the Site from May to August 2009 to <br /> complete access negotiations with the Port of Stockton. However, in a voice mail to <br /> Central Valley Water Board staff on 26 May 2009. Stantec stated that drilling could <br /> begin during the second week in June. ConocoPhillips plans to submit a report within <br /> 60 days of well installation and implement the additional six months of bi-weekly oxygen <br /> injection events upon completion of the proposed well installations. <br /> ConocoPhillips conducts groundwater monitoring at the Site pursuant to Monitoring and <br /> Reporting Program (MRP) No. R5-2004-0824. The 29 April 2009 First Quarter 2009 <br /> Status Summary Repori (First QMR) describes groundwater monitoring activities <br /> performed in February 2009. During the first quarter. depth to groundwater varied from <br /> about three to 14 feet below ground surface (bgs). The hydrostratigraphy underlying the <br /> Site consists of three progressively deeper layers called the A, B, and C zones. The <br /> A zone occurs at depths of about 10 to 25 feet bgs. the B zone from 30 to 50 feet bgs. <br /> and the C zone from 55 to 75 feet bgs. The groundwater flow directions in the A, B, and <br /> C zones were to the southwest. The gradients ranged from 0.001 feet per foot (ft/ft) in <br /> the C zone to 0.002 ft/ft in the A zone. The gradients are consistent with previous <br /> observations. <br /> Groundwater underlying the Site is polluted with dissolved petroleum hydrocarbons. <br /> Constituents of concern (COCs) include total petroleum hydrocarbons as gasoline <br /> (TPHg). TPH as diesel (TPHd), methyl tertiary butyl ether (MTBE), di-isopropyl ether <br /> (DIPE), and tertiary butyl alcohol (TBA). Benzene, toluene, ethyl benzene, and xylenes <br /> (BTEX) historically have been essentially non-detect (ND) in Site wells. TPHg <br /> California Environmental Protection .4genc.r <br />