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STATE OF CALIFORNIA- Environmental Prote*Agency � PETE WILSON, Governor <br /> CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD <br /> CENTRAL VALLEY REGION I .T1;i HEALTH <br /> 3443 Rouder Road, Suite A (�{ r.: '.i ,�.j"VI(,E <br /> Sacramento, CA 95827-3098 pp�� ,p <br /> PHONE:(916) 255-3000 Cl6 OCT 'S PM Z' �� rr <br /> FAX:(916) 255-3015 W <br /> October 3, 1994 <br /> Mr. John Guzman <br /> Defense Distribution Region West <br /> P.O. Box 960001 <br /> Stockton, CA 95296-0250 <br /> FINAL CLOSURE REPORT FOR UNDERGROUND STORAGE TANK REMOVA4 DDRW <br /> SHARPE FACILITY, STOCKTON, SAN JOAQUIN COUNTY <br /> We have reviewed the Final Closure Report for eleven underground storage tank (UST), prepared by <br /> PetroCon, Inc. for DDRW Sharpe, received 22 July 1994. The purpose of the Closure Report is to <br /> provide the Board with sufficient information to make a dertermination if any of the site require <br /> additional action. The closure reports indicate that soil contamination remains at six sites. We <br /> request an investigation be conducted to define the nature and extent of soil and ground water <br /> contamination at these sites. Five sites: 3, 10, 25/74, 58, and 61 may be considered closed. <br /> Work Plans must be prepared for the following tank sites: 5, 12, 15, 17, 18-18A, and 34. The <br /> objective of these Work Plans should be to accurately delineate the lateral and vertical extent of soil <br /> and ground water contamination associated with each of the tank sites. Petroleum hydrocarbons, as <br /> diesel must be defined to non-detectable levels. The Work Plans for further investigation of tanks 5, <br /> 12, 15, 17, 18-18A and 34 are to include: <br /> 1. A map showing the location of these tanks relative to the base as a whole and the <br /> monitoring well network presently existing at the Sharpe facility. <br /> 2. Proposed soil borings and monitoring well installations, with locations, sampling <br /> depths, and laboratory analysis. Existing monitoring wells may be utilized in this <br /> evaluation, if appropriately located. <br /> The Army should submit a Work Plan addressing the above comments with a schedule for completion <br /> of individual tasks by 15 November 1994. Upon approval of the Work Plan, work can begin. <br /> If you have any questions, please call me at (916) 255-3047. <br /> �t -305► <br /> (�RI CONDON <br /> Associate Engineering Geologist <br /> cc: Mr. Marlon Mezquita, U. S. Environmental Protection Agency, Region IX, San Francisco <br /> Ms. Tracie Billington Department of Toxic Substances Control, Sacramento <br /> Mr. Fred Mueller, Us Army Corps of Engineers, Sacramento District <br /> Ms. Margaret Lagorio, Public Health Services of San Joaquin County, Environmental Health, <br /> Stockton <br />