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MEMORANDUM CALIFORNIA REGIONAL W06R QUALITY CONTROL BOAR CENTRAL VALLEY R- 3443 Routier Road Phone: (916) Sacramento, CA 95827-3098 ATSS Phone: ?- TO: Antonia Vorster FROM: John J. Tomkoo DATE: 17 July 1989 SIGNATURE: 4& SUBJECT: Statement of Work for Interim Ground Water Extraction, Withdrawal , and Disc System, July 1989, Defense Depot Tracy, San Joaquin County. I have reviewed the subject report. The Depot is requesting the telefaxing of our cc to them no later than 24 July 1989 so they can meet their funding deadline for the C federal fiscal year. The Depot has agreed to conduct a phased approach to their Interim Remedial Act= requested in our letter of May 1989. The Depot intends to install five extraction three injection wells, and ten monitoring wells as an initial phase. They also inti construct a stripping tower to handle flows up to 500 gpm. The Statement of Work provides a fairly comprehensive phased approach to the instal ' of an interim ground water extraction, treatment, and disposal system. However, I h-a . following comments and concerns regarding this Statement of Work: 1) Section 3. 1.3.4 states that a permit to discharge will have to be obtainer the Department of Water Resources and the Regional Water Quality Control The only required permit to discharge to the injection wells and the stor* is a Waste Discharge Requirement's permit from the Regional Board. A Rep- Waste Discharge application form and the associated filing fee schedule mt: completed by the Depot before Waste Discharge Requirements are draftee monitoring requirements discussed below will likely be included in the requirements. 2) Section 3.13. 15 discusses the content of a Ground Water Model Report tha.- be prepared by the contractor prior to the construction of the ground system. Though the main objective of the extraction system is to contain site migration of contaminants, because of the unknowns associated wi hydrogeology of the site, an important aspect of this initial phase generate the hydrological and water quality data necessary to evalua� . effectiveness of the initial design, and to feedback the collected data. : ground water model , to the design of the subsequent phases of extracti injection well installation. In order to generate useful data it is nec.- to install monitoring wells in the proper locations and at appropriate and to effectively monitor the extraction, injection, and monitoring ra . The Ground Water Model Report should provide the strategy to be emoir: collecting the necessary data. The extraction and injection we: apparently be placed and screened within the more permeable strata the site and the exact determination of these strata will be based on