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• S,ATE OF(ALIFCRNIA • <br /> GEORGE DEUKM EJIAN,Governor <br /> CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD— <br /> CENTRAL VALLEY REGION <br /> 3443 ROUTIER ROAD <br /> SACRAMENTO.CA 95827-3098 <br /> 19 October 1987 <br /> Fred Burkett, LTC, USA ��V\RRA\ <br /> Director, Office of Installation Services F� <br /> Defense Depot Tracy <br /> Tracy, CA 95367-5000 <br /> GROUND WATER REMEDIAL INVESTIGATION/FEASIBILITY STUDY, DEFENSE <br /> DEPOT TRACY, SAN JOAQUIN COUNTY <br /> We are aware that the final phase of well construction, based on <br /> the currently approved RI/FS contract, has been planned, and work <br /> is scheduled to begin shortly at this site. This phase of work, <br /> when completed, will not sufficiently define the extent of off- <br /> site contamination. <br /> If all of the planned wells indicate non-detectable levels of <br /> contaminants, there are still areas which will need to be <br /> investigated as indicated in the attached memorandum. In <br /> addition, more information on the plume configuration in Area 2 <br /> will be needed in order to create an acceptable model for use in <br /> the similarly contaminated area to the south, Area 3 . If <br /> detectable levels of contaminants are found in the proposed <br /> wells, additional wells will be needed to determine the full <br /> lateral and vertical extent of the off-site contamination in Area <br /> 2. More wells are also needed down gradient of Area 3 . As we <br /> stated in our last letter, this is one of the conditions which <br /> must be met if a model is to be used to define the extent of <br /> contamination in Area 3 . <br /> We must emphasize that the use of the model to define <br /> contamination in Area 3 is dependent on a complete <br /> characterization of the plume configuration. in Area 2 . The use <br /> of a model to "fill in" vital missing information in Area 2 is <br /> not acceptable. <br /> We feel it is necessary for you to exercise the options available <br /> in the current contract in order to complete the Remedial <br /> Investigation. Since 15 February 1988 is the deadline for those <br /> options to be exercised, you should move quickly to secure them. <br /> The progress of the current phase of the investigation has been <br /> acceptable, but if complete site characterization is delayed <br /> beyond the term of the contract for RI/FS work which is currently <br /> in effect we will have to consider enforcement action against <br /> Defense Depot Tracy. This should not be necessary if the options <br /> in the existing contract are exercised to meet the goal of <br /> complete characterization of the contaminant plume. <br />