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t <br />STATE E+F- CALIF ORNIA PETE WILSON, Governor <br />CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD— ;•�=_ <br />CENTRAL VALLEY REGION <br />3443 ROUTIER ROAD, SUITE A <br />SACRAMENTO, CA 95827-3098 <br />PHONE: (916) 361-5600 <br />FAX: (916) 361-5686 <br />7 November 1991 <br />Mr. Abel Haines <br />Director, Environmental Protection Office <br />Defense Distribution Region West, Sharpe Site <br />Lathrop, CA 95331 <br />WORK PLAN FOR UNDERGROUND TANK INVESTIGATION, DEFENSE DISTRIBUTION REGION WEST <br />(DDRW), SHARPE SITE, SAN JOAQUIN COUNTY <br />We have reviewed the Work Plan for Underground Tank Investigation submitted on <br />2 October 1991 by the U. S. Army Toxic and Hazardous Materials Agency <br />(USATHAMA) and prepared by Environmental Science and Engineering (ESE). On 15 <br />and 18 October 1991, I discussed my major concerns with Mr. Craig MacPhee of <br />USATHAMA. My major concerns involved completion of all of the underground <br />tank (UGT) investigations at the site, cleanup criteria in the Plan and the <br />installation of monitor wells at selected tank sites. These concerns, as well <br />as other comments on the Work Plan, can be found in the enclosed memorandum. <br />In general, we found the Work Plan to be adequate. We commend USATHAMA/ESE <br />for the preparation of the tables which summarized the previous investigations <br />conducted at each of the tank sites. The tables expedited the review of the <br />Plan. Although there remains several tanks at the site which have no sampling <br />data, we support the approach to conduct a "complete" investigation at <br />selected tank sites rather than conducting the investigation to fill data <br />gaps. <br />However, we are concerned that the soil cleanup levels for total petroleum <br />hydrocarbons (TPH) may not be acceptable. The depths of the soils samples <br />with existing analytical data were not provided, therefore we cannot concur <br />with the proposed cleanup levels of 100 milligrams per kilogram (mg/kg) for <br />diesel and 10 mg/kg for gasoline. Based on the analytical results of the data <br />to be developed, we should better be able to concur with the proposed cleanup <br />levels after the investigation is conducted. <br />We understand that you will address cleanup of the contaminated soils and <br />ground water for the remaining tank sites under the Comprehensive <br />Environmental Response, Compensation and Liability Act (CERCLA) process. We <br />