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STATE OF CALIFORNIA- Environmental Protectogency • PETE WILSON, Governor. <br /> CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD (P.,i- HEALTH <br /> CENTRAL VALLEY REGION "VICE <br /> 3443 Routier Road, Suite A <br /> Sacramento, CA 95827-3098 2 <br /> 94 ���- � PN ' O� <br /> PHONE:(916) 255-3000 L <br /> DOD FAX: (916) 255-3052 <br /> 22 July 1994 <br /> Mr. John J. Guzman <br /> Defense Distribution Region West <br /> P.O. Box 960001 <br /> Stockton, CA 95296-0250 <br /> FINAL CLOSURE REPORT FOR UNDERGROUND STORAGE TANK REA-fOY-9L, DDRW <br /> SHARPE FACILITY, STOCKTON, SAN JOAQUIN COUNTY <br /> We have reviewed the eight underground storage tank (UST) closure reports prepared by <br /> Environmental Investigation & Action, Inc. (EIA) for DDRW Sharpe, received 21 April 1994. The <br /> purpose for a closure report is to provide a document upon which the regulator may make an <br /> objective decision regarding the requested closure. Based on this set of closure reports soil <br /> contamination remains at two sites. At these sites an investigation must be conducted to define the <br /> nature and extent of the soil problem. Petroleum hydrocarbons, as diesel must be defined to non- <br /> detectable levels to determine whether a "soil only" or a soil and ground water remediation must be <br /> considered. <br /> Work plans for tanks sites 73K and 7B must be prepared to address concentrations of diesel fuel <br /> reported in native soils underlying these UST systems. The remaining six sites (45K, 71E, 72J, <br /> 60L, 70G, and 79F) may be considered closed. <br /> The Work Plans for further investigation of tanks 73K and 7B is to include a base map illustrating <br /> the location of these tanks relative to the monitoring well network presently existing at the Sharpe <br /> facility and one year's chemical analysis, prior to the tank removal, of the closest down gradient <br /> wells for each of these tanks. The objective of these work plans should be to accurately delineate <br /> the lateral and vertical extent of soil contamination associated with the two tanks. Therefore, the <br /> Work Plan should also include a recommendation for boreholes, with locations, sampling depths, <br /> and laboratory analysis proposed. <br /> Please submit a Work Plan with a schedule for completion of individual tasks by <br /> 30 September 1994 . Upon approval of the work plan, to define soil contamination, work can <br /> begin. <br /> If you have any questions, please call me at (916) 255-3047. <br /> CORI CONDON <br /> Associate Engineering Geologist <br /> cc: Ms. Margaret Lagorio, Public Health Services of San Joaquin County, Environmental <br /> Health, Stockton <br /> Ms. Tracie Billington, Department of Toxic Substances Control, Region 1, Sacramento <br /> Mr. Marlon Mezquita, U. S. Environmental Protection Agency, Region IX, San Francisco <br />