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The United States Air Force (USAF) is currently engaged in a program to identify and mitigate impacts resulting from past solid waste handling and disposal procedures at their facilities. This program is known as the Installation Restoration Program (IRP) and is composed of four phases. Phase II is a confirmation of the existence or absence of contamination which is divided into Stage 1 (qualitative) and Stage 2 (quantitative) investigations. This report defines the activities completed in Phase II, Stage 2-1 at McClellan Air Force Base California. It is divided into two volumes.
The United States Air Force (USAF) is currently engaged in a program to identify and mitigate impacts resulting from past solid waste handling and disposal procedures at their facilities. This program is known as the Installation Restoration Program (IRP) and is composed of four phases. Phase II is a confirmation of the existence or absence of contamination which is divided into Stage 1 (qualitative) and Stage 2 (quantatitive) investigations. This volume contains the supporting data and appendices to AD-A156282 which deals with activities at McClellan Air Force Base (AFB) near Sacramento, California.
An investigation was performed to confirm the presence, type and distribution of groundwater contamination as previously identified in the IRP Phase II, Stage 1 reconnaissance survey. The field study included geophysical surveys, construction of 10 two-inch diameter monitoring wells and nine six-inch diameter high yield wells, sampling and analysis of more than 200 groundwater samples, and multi-seasonal observation of the piezometric surfaces in the shallow aquifer. Study findings confirm two areas contaminated by weathered petroleum products. The more contaminated site appears to be contained on the base and not migrating; the second site is near the base property line and hydrocarbon contamination has been monitored at the surface of the water table outside of the base boundaries. The contamination at both sites appears to be historical in origin, and the probable sources are identified. A third area of concern is associated with low molecular weight chlorinated hydrocarbon contamination in the groundwater near the American Lake Garden Tract. No sources of these contaminants have been identified. Remedial measures can proceed in the areas of petroleum contamination. Additional investigations, however, should be conducted in the McChord AFB/American Lake Garden Tract areas to confirm the extent and characteristics of contamination and identify probable sources of pollution prior to development of remedial actions.
A total of 13 sites at Homestead Air Force Base (AFB) were identified by the Phase I Installation Assessment as having a potential for environmental contamination. These 13 sites were ranked using the Hazardous Assessment Rating Methodology (HARM) and the top eight ranked sites were recommended for monitoring under Phase II. Two additional sites, from the original 13 sites, the leak at Pump Station No. 9 (SP-5) and the Residual Pesticide Disposal Area (P-3), were added by USAFOEHL to the Phase I recommendations for monitoring making a total of 10 sites which received Phase II confirmation investigation. Two sites (SP-4 and SP-6), located near the west gate, in close proximity to one another, are indistinguishable from each other based on the groundwater analysis results. these are combined into a single zone for Phase II, Stage 2 recommendations. Nineteen 2-inch groundwater monitoring wells were installed into the upper Biscayne aquifer during Phase II, Stages. These, along with three existing wells, were sampled, with samples being shipped to both OEHL and SAIC laboratories. Soil samples were collected at three sites, and sediment samples at two.
The Department of Defense's Installation Restoration Program (IRP) is a four-phase program to identify past waste disposal practices, evaluate environmental impacts, propose mitigation measures, and remediate environmental problems. Phase I of the IRP is an initial assessment and records search to locate potential environmental problems associated with waste disposal practices. The Phase II field study was conducted between March 1984 and August 1986. The investigation focused on whether environmental contamination had occurred, the magnitude and extent of the contamination, and the environmental consequences of migrating pollutants. Nine coreholes and nine groundwater monitoring wells were drilled, and sampled. Contaminants were detected in the soil and groundwater at most of the sites. The contaminants detected in the highest quantities in the groundwater were lead and benzene. However, the shallow groundwater at the base is not used for drinking water. Shallow groundwater use outside the base is unknown, but it is not believed to include drinking water supplies. Additionally, the existing aquifers are thin and discontinuous on the base so that no known immediate treat to human health exists. Each of the eleven sites was categorized according to Air Force criteria: Category I - no further investigation required, Category II - additional work needed, or Category III - institute remedial action. All sites were Category II.
The Phase II (Records Search) Installation Restoration Program study at Sheppard AFB initially identified twenty-three individual sites of potential environmental concern. Of these twenty-three, eleven sites were identified as possibly containing hazardous waste. These sites were evaluated using the USAF Hazard Assessment Rating Methodology (HARM). Based upon the HARM scores, four of the eleven sites were identified for Phase II investigations. This investigation (Phase II stage 1) was conducted between October 1984 and February 1985, and included geophysical surveys, the installation and sampling of nine ground-water monitoring wells, coring and sampling of shallow soils at two of the four sites, and sampling and analysis of surface water from seven locations near the waste sites. Keywords: Installation restoration, Groundwater sampling, Surfacewater sampling, Soil sampling, Remedial action, Hazardous waste, Geophysical surveys, Monitoring wells.
The Department of Defense's Installation Restoration Program (IRP) is a four-phase program to identify past waste disposal practices, evaluate environmental impacts, propose mitigation measures, and remediate environmental problems. Phase I of the IRP is an initial assessment and records search to locate potential environmental problems associated with waste disposal practices. The Phase II field study was conducted between March 1984 and August 1986. The investigation focused on whether environmental contamination had occurred, the magnitude and extent of the contamination, and the environmental consequences of migrating pollutants. Nine coreholes and nine groundwater monitoring wells were drilled, and sampled. Contaminants were detected in the soil and groundwater at most of the sites. The contaminants detected in the highest quantities in the groundwater were lead and benzene. However, the shallow groundwater at the base is not used for drinking water. Shallow groundwater use outside the base is unknown, but it is not believed to include drinking water supplies. Additionally, the existing aquifers are thin and discontinuous on the base so that no known immediate treat to human health exists. Each of the eleven sites was categorized according to Air Force criteria: Category I - no further investigation required, Category II - additional work needed, or Category III - institute remedial action. All sites were Category II.