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STATE OF CALIFORNIA—ENVIRONMENTAL P0I014 AGENCY • PETE WILSON,Govemor <br /> CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD— w, <br /> CENTRAL VALLEY REGION <br /> 3443 ROUTIER ROAD,SUITE A <br /> SACRAMENTO,CA 95827-3098 . <br /> PHONE: (918)2553000 <br /> FAX: (916)255-3015 JJlllii!��"'ll"/ll r��Jaj J,l <br /> 26 June 1995 <br /> JUN 2 8 1995 <br /> Mr. Gerald O'Regan ENVIRONMENTAL HEALTH <br /> Pacific Environmental Group PERMIT/SERVICES <br /> 2025 Gateway Place Ste 440 <br /> San Jose CA 95110 <br /> REVIEW OF PROPOSED SCOPE OF WORK FOR WELL ABANDONMENT,MONITORING <br /> WELL CONSTRUCTION,AND GROUND WATER SAMPLING AT SHELL BULK <br /> TERMINAL, STOCKTON, SAN JOAQUIN COUNTY (Case No. 3007) <br /> We have reviewed the proposed scope of work(SOW) prepared by Pacific Environmental Group <br /> for construction of wells, ground water sampling, and abandonment of wells at the Shell Bulk <br /> Terminal in Stockton. The SOW was submitted on 23 May 1995 and it responded to tasks <br /> requested in our letter dated 27 March 1995 and to teleconference discussion between us and <br /> Pacific Environmental,representing Shell, on 12 April 1995. <br /> The SOW proposes to construct two new monitoring wells to further define the extent of <br /> hydrocarbons in the secondary source area (SSA-3) and the vertical extent of the dissolved <br /> hydrocarbon plume. One new well, MW-28, will be a shallow well; the other new well, DW-2, <br /> will be a deep monitoring well. Existing deep monitoring well DW-1 will be abandoned. Ground <br /> water samples will be collected from all three wells before abandonment of DW-1. <br /> We find the proposed SOW acceptable. Please note that we have already requested that TPH <br /> analyses include a method that involves GCFID, and that peaks that do not conform to the <br /> standards be reported. We prefer that copies of the chromatograms be included, in this case, <br /> particularly to verify and resolve the concerns raised in our earlier review and conversations about <br /> the references in the 1994 Annual Monitoring Report to"atypical" diesel. In addition, we regard <br /> the proposed subsurface vertical sampling frequency of 5 feet as a maximum frequency, and <br /> recommend, as feasible, sampling continuously or at least at every lithologic change. <br /> Please inform us at least three days ahead of field activity. We may wish to observe and possibly <br /> to split samples. <br /> If you have questions, please call me at (916) 255-3119. <br /> k*iee <br /> GAIL WIGGETT <br /> Associate Engineering Geologist <br /> cc: Mr. Harlin Knoll, San Joaquin Public Health Services, Stockton <br /> Mr. Brad Boschetto, Shell Oil Company, Anaheim <br /> Mr. Darren Denning, Shell Oil Company, Anaheim <br />