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California N- io'nal Water Quality ControlBoard <br /> Central ValleN Region, <br /> Karl V. LongleN. SeD. P.F..Chair <br /> Linda S. Nd:ml� Arnold <br /> Sacramento Main 01 ic•c <br /> _ Schwarzencgl'cr <br /> ..•,.n;, ,r.;r 1 If,-'(�tion l cnlcl Dmc:200. Rancho C ordU%a.l aIOmni a 9.4674h1 1.1 r;,nrrn„r <br /> 11h,1nr ir)lb1 4(A-­_9 1 •IAN iulr�)464-46.1 <br /> 11111 X+n t%;IwrllmlydC Ca o\ cennahallc. <br /> 19 August 2008 <br /> AUG 2 1 2008 <br /> Mr. Joe Aldridge, Remediation Manager ENVIRQRIlvtEN HEALTH <br /> NuStar Energy L.P PERMlTlSEPOCES <br /> 2330 North Loop 1604 West <br /> San Antonio, TX 78278 <br /> REVISED VERTICAL GROUNDWATER CHARACTERIZATION WORK PLAN, NUSTAR <br /> TERMINALS OPERATING PARTNERSHIP LP. 2941 NAVY DRIVE. STOCKTON. SAN <br /> JOAQUIN COUNTY <br /> Regional Water Quality Control Board, Central Valley Region (Regional Water Board) staff <br /> reviewed the 21 July 2008 Revised Vertical Groundwater Characterization Work Plan (Revised <br /> Work Plan). Ash Creek Associates, Inc. (Ash Creek) prepared the Revised Work Plan on <br /> behalf of ST Services, L.L.C. (a subsidiary of NuStar Energy L.P. [NuStar]) for the ST Services <br /> Stockton Terminal located at 2941 Navy Drive in Stockton (Site). <br /> NuStar submitted the Revised Work Plan in response to the Regional Water Board staff's <br /> 12 June 2008 letter requesting submission of a revised Work Plan to complete site <br /> characterization more quickly, preferably using the Triad Approach. In an 8 July 2008 <br /> 'elephone conversation Ms Amanda Spencer with A.sh Creek. stated that mobile laboratory <br /> costs made the Triad Approach prohibitively expensive Therefore. the Revised Work Plan <br /> proposes to <br /> • advance six borings, using direct push drilling technology. to initiate the Investigation of the <br /> B-zone aquifer (40 to 55 feet deep), <br /> • submit two to three groundwater samples per day to a fixed laboratory on a 24-hour <br /> turnaround time so that the next phase of the investigation can be planned without the <br /> need for remobilization, <br /> • submit the groundwater samples for laboratory analysis for the principal contaminants of <br /> concern (CDCs). including total petroleum hydrocarbons as gasoline (TPHg). TPH as <br /> diesel (TPHd), benzene. toluene. ethylbenzene. and xylenes (BTEX). tertiary amyl methyl <br /> ether (TAME), methyl tertiary butyl ether (MTBE). tertiary butyl alcohol (TBA). di-isopropyl <br /> ether (DIPE). ethyl tert-butyl ether (ETRE), methanol and ethanol. <br /> • submit soil samples for TPHd, TPHg, methanol. and volatile organic compounds (VOCs), <br /> install step-out B-zone borings, if necessary. to complete the delineation of pollutants in the <br /> B-zone: <br /> • evaluate the data to determine optimal locations for B-zone groundwater well installation.. if <br /> additional borehole advancement is not planned. <br /> C(I/if(')I'll icr E/11•iMilinc11Ill/ Prulccviurr .-t;cnc.> <br />