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The Eastern Study Area (ESA) Report summarizes a portion of the Remedial Investigation (RI) conducted at Rocky Mountain Arsenal (RMA). This report, Volume VII of the On-Post RI, integrates the study area history, geology, and hydrology with the results from soil, surface water, groundwater, air, biota, and structures investigations to identify contaminant sources, distribution patterns, and migration pathways. The ESA encompasses approximately 10 square miles on the eastern tier of RMA, and includes all of Sections 5, 19, 20, 30, 31, and 32 and portions of Sections 6, 7, 8, 20, 24, and 25. The ESA shares information along the western boundary from five adjacent study areas, including the Southern, South Plants, Central, North Plants, and North Central Study Areas. The boundaries of the ESA were chosen to delineate an area which is east of the primary manufacturing and disposal facilities on RMA. As the boundaries are drawn, no groundwater contaminant plumes are identified within the ESA, and the entire length of First Creek within RMA boundaries is in the ESA.
The purpose of the Southern Study Area (SSA) Report is to present the Army's Remedial Investigation (RI) results for the southern portion of Rocky Mountain Arsenal (RMA). This document is a formal RI product in accordance with the proposed Federal Facilities Agreement and Settlement Agreement (1988), the RMA Technical Program Plan (TPP) (PMO, 1988/RIC 88131R01), and the June 1985 U.S. Environmental Protection Agency (EPA) RI Guidance Document. The seven completed RI Study Area Reports (SARs), along with the RI media reports for air, biota, buildings, and water, fulfill the requirements of defining the nature and extent of contamination, and completing a comprehensive RI for the On-post Operable Unit of RMA as required by the Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA), the Superfund Amendments and Reauthorization Act (SARA), and the National Contingency Plan (NCP). The SSA report integrates known historical information, the results of previous investigations, and the current RI programs for buildings, soil, surface water, groundwater, biota, and air to present an overall environmental contamination assessment of the study area as required under Contract Numbers DAAA15-88-D- 0024. The SSA Report represents Volume VI of the overall RMA Remedial Investigation.
The Southern Study Area (SSA) report integrates the study area history, geology, and hydrology with the results of soil, surface water, ground water, air, biota, and structures investigations to define the nature and extent of contamination in the southern portion of RMA. The SSA includes all of sections 11 and 12 and portions of sections 1, 2, 3, and 7. Historic reports indicate that the SSA was not used for the production of agents or pesticides, but was a disposal area and buffer zone. 904 soil samples were analyzed as were surface water samples and ground water samples from numerous wells. Organochlorine pesticides and HG are the most commonly detected contaminants. The volume of potentially contaminated soil is estimated at 1.51 million cubic yards. This report is presented in three sections: characterization of the study area - geology, hydrology, climate history.
The North Central Study Area (NCSA) report integrates the study area history, geology, and hydrology with the results of soil, surface water, ground water, air, biota, and structures investigations to define the nature and extent of contamination of the central and northern areas of RMA. The NCSA includes the disposal basins, interconnecting ditches and adjoining sites, the sewer systems, and the north and northwest boundary contaminant systems. The chemical sampling program included analysis of 2,186 samples from 965 bores and monitoring of over 230 wells and 8 surface water locations. The most widely distributed contaminant group is organochlorine pesticides. The volume of potentially contaminated soil is estimated to be 9.2 million cubic yards.