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STATE OF CALIFORNIA • • <br /> CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD— PETE wasoN, co e, o, <br /> CENTRAL VALLEY REGION ='� . <br /> 3443 ROUTIER ROAD, SUITE A <br /> SACRAMENTO, CA 95827-3098 eL <br /> PHONE: (916) 361-5600 `\v�J� <br /> FAX: (916) 361-5686 <br /> f�UY <br /> 7 November 1991 _ <br /> r y <br /> Mr. Abel Haines <br /> Director, Environmental Protection Office <br /> Defense Distribution Region West, Sharpe Site <br /> Lat prop, 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 />