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•i <br /> STATE OF CALIFORNIA It <br /> CAI_IFOR'NIA REGIONAL WATER QUALITY CONTROL BOARD— '" sca. Governor <br /> CENTRAL VALLEY REGION - <br /> 3443 ROUTIER ROAD. SUITE A �4 ' 'd"Y' ie <br /> SACRAMENTO. CA 95827-3098 � a:, <br /> PHONE: (916) 361-5600 `` PE +•w.,,..°' <br /> FAX: (916) 361-5686 <br /> J U L 0 1 1992 <br /> ENVIRONMENTAL HEALTH <br /> Mr. Abel Haines PERMIT/SERVICES <br /> Environmental Protection Office 26 June 1992 <br /> Defense Distribution Region West <br /> P. 0. Box 960001 <br /> Stockton, CA 95296-0250 <br /> 1991 ANNUAL PROGRESS REPORT, GROUND WATER MONITORING PROGRAM. DEFENSE <br /> DISTRIBUTION REGION WEST (DDRW) , SHARPE, SAN JOAQUIN COUNTY <br /> We have reviewed the 1991 Annual Progress Report, submitted as part of DDRW, <br /> Sharpe's ground water monitoring program. The Report was well prepared. Our <br /> initial review of the document was discussed with Mr. Craig MacPhee of the U. S. <br /> Army Toxic and Hazardous Materials Agency (USATHAMA) on 20 May 1992. The <br /> enclosed memorandum includes those issues discussed with Mr. MacPhee, as well as <br /> other major concerns with the document. <br /> As with previous documents, adequate justification for changes in the monitoring <br /> program was not provided. Therefore, we are unable to concur with the specific <br /> changes in the frequency of the monitoring program. We would like to discuss <br /> these proposed changes at the next Project Manager's Meeting. <br /> We are also concerned that the continued use of A-4 and NA-7 as extraction wells <br /> may only serve to exacerbate the plume extent. The current total volatile <br /> organic constituent (VOC) concentrations in samples from these wells are well <br /> below the proposed aquifer cleanup level of 5 micrograms per liter (µg/1 ) for <br /> trichloroethylene (the Primary Maximum Contaminant Level (MCL)) . We request <br /> that the use of these extraction wells be discontinued until such time as the <br /> VOC concentrations exceed the Primary MCL. <br /> We do not concur with the proposal to monitor wells annually for aromatic VOCs. <br /> Because the ground water is known to contain petroleum hydrocarbon contamination <br /> and because the underground storage tank (UST) investigation is incomplete, <br /> annual monitoring for aromatic VOCs in the areas of the USTs is inadequate. <br /> �Iff you have any questions, please call me at (916)361-5670. <br /> CAMILLA WILLIAMS <br /> Engineering Geologist <br /> CKW:cw <br /> Enclosure <br />