SITE INFORMATION AND CORRESPONDENCE_1987-1992

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ffl LEEDSHILL•HEPKENHOFF. INC. establish existing water quality conditions near the outer bounds of the Lincoln Village Center. Based on information generated from completion of the above tasks, addition- al work may be required. The exact scope and level of effort is not quanti- fiable at this time, but will be addressed at the completion of the Phase I work and recommended for Phase II. PHASE I - INVESTIGATION TASK 1 - SITE HISTORY The history of product use and disposal practices of potential contaminants will be documented, based on existing information plus interviews with the operators of the dry-cleaners and other establishments that are possible sources of contamination. Dates and quantities of product disposal will be documented insofar as data are available. Source evaluation will include documentation of the use of floor drains or other means of disposal . TASK 2 - EVALUATION OF EXISTING DATA Existing data include geologic logs and construction details of wells in the area, as-built sewer and storm drain plans, pumping records of Lincoln Village wells and analytical laboratory data for water samples from Lincoln Village wells. Other information may be available from the RWQCB, San Joaquin Local Health District and San Joaquin County Public Works Depart- ment, County Maintenance District, Department of Water Resources, Department of Health Services and U.S. Geological Survey. All available data will be evaluated to derive maximum benefit from work already completed. All perti - nent data will be summarized and presented in the report. TASK 3 - GROUNDWATER INVESTIGATION The proposed groundwater investigation is designed to address the concerns of the RWQCB regarding the presence and movement of shallow groundwater contamination, and to provide a basis for recommending additional Phase II engineering services. -2-