SITE INFORMATION AND CORRESPONDENCE_1988-1991

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David Wang, P.E. , Chief Page 2 March 6, 1991 Evaluation of environmental conditions at DDRW Sharpe began with the 1980 USATHAMA installation assessment. Since that time Battele Laboratories (1983) and ESE (through the present) have been contracted to determine the types and extent of contamination resulting from past activities. Early studies focused on ground water contamination consisting primarily of volatile organic compounds (VOC) . Agencies regulating the remedial activities at DDRW Sharpe (the Department, the U.S. Environmental Protection Agency, and the California Regional Water Quality Control Board) entered into a Federal Facilities Agreement (FFA) with the Army. The purpose of the FFA is to establish a framework for DDRW Sharpe ' s installation restoration program. A fundamental ingredient of the FFA is the schedule of deliverable documents which it serves to channel work efforts towards a successful conclusion for the installation restoration program. An important schedule component is the RI Report that is the subject of this memorandum. The RI Report compiles the scientific data that will be the foundation for more interpretive documents that will follow, primarily the Risk Assessment and FS . RI REPORT CONTENTS The RI Report summarizes all data gathered from 1980 to the present. The data gathered in support of this Report consists of: o more than 3 , 500 ground water samples, many analyzed for more than 30 different constituents. ; o approximately 1, 800 soil gas samples; 0 over 500 soil samples; and 0 200 air samples REPORTED RI FINDINGS ESE' s findings are summarized in the following section of the memorandum. They are presented here without interpretation by the Department. GROUND WATER CONCLUSIONS: o The geology beneath DDRW Sharpe is a complex of interbeded sand, silt, and clays. Individual lithologic units tend to be discontinuous over distance.