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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 /> Secretarvjor Sacramento Main Office Arnold <br /> Environmental 11020 Sun Center Drive#200,Rancho Cordova,California 95670-6114 Governor <br /> Protection Phone v9ww. acerb a FAX(A,;CFgVEDD <br /> http://www.waterboards.ca.go <br /> 3UN 16 2008 <br /> 12 June 2008 ENVIRONMENT HEAt„11A <br /> >�I:RM1T���RV#C�3 <br /> Mr. Joe Aldridge, Remediation Manager <br /> NuStar Energy L.P <br /> 2330 North Loop 1604 West <br /> San Antonio, TX 78278 <br /> VERTICAL GROUNDWATER CHARACTERIZATION WORK PLAN, ST SERVICES BULK <br /> FUEL TERMINAL, 2941 NAVY DRIVE, STOCKTON, SAN JOAQUIN COUNTY <br /> Regional Water Quality Control Board - Central Valley Region (Regional Water Board) staff <br /> reviewed the 28 April 2008 Vertical Groundwater Characterization Work Plan (Work Plan). <br /> Ash Creek Associates, Inc. (Ash Creek) prepared the Work Plan on behalf of ST Services, <br /> L.L.C. (a subsidiary of NuStar Energy L.P. [NuStar]) for the ST Services Stockton Terminal <br /> located at 2941 Navy Drive in Stockton (Site). <br /> NuStar submitted the Work Plan in response to the Regional Water Board's 26 March 2008 <br /> letter requesting submission of a groundwater investigation work plan to delineate the vertical <br /> extent of the plume in the source area. NuStar proposes using a phased approach to <br /> determine whether groundwater underlying and downgradient of the facility has been <br /> degraded by releases from the facility. Groundwater bearing units underlying the Site are <br /> subdivided into four progressively deeper units designated Zones "A" through "D". The Work <br /> Plan proposes to <br /> • advance six soil borings in the B zone during the first phase of the investigation <br /> upgradient, beneath and downgradient of the area at the facility with current or historic <br /> separate phase hydrocarbons (SPH) using a direct push drilling rig; <br /> • collect continuous soil cores from each boring and field screen them with a photoionization <br /> detector at five-foot intervals and collect one grab groundwater sample from each boring; <br /> • submit 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 (ETBE) and ethanol; <br /> • evaluate the data to determine optimal locations for groundwater well installation; <br /> • install step-out B-zone borings, if necessary, to complete the delineation of pollutants in the <br /> B-zone; <br /> • submit a work plan addendum, if warranted based on B-zone results, proposing to advance <br /> borings in the C-zone, possibly using a different drilling technology ; and <br /> California Environmental Protection Agency <br /> cai RecYcled Paper <br />