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Fifteen sites of potential environmental concern, grouped into six waste management zones, were evaluated. A total of 22 monitor wells were installed and groundwater samples were obtained from each well. Soil samples were obtained for chemical analysis from 12 soil borings. Samples of surface water, bottom sediments and fish tissues were obtained from three ponds. All chemical analyses were accomplished in accordance with Standard USEPA analytical methods. Based on the sampling and analyses performed, levels of contamination were found in soils or groundwater at seven of the 15 sites evaluated which warrant further investigation and potential remedial actions. Recommendations were made as to appropriate follow-up site evaluation work at these seven sites.
The Department of the Air Force has prepared an Engineering Evaluation/Cost Analysis and assessment of environmental impact to respond to contaminated ground water in Operable Unit (OU) B at McClellan AFB, California. Proposed action involves: (1) installation of extraction wells; (2) extraction of contaminated ground water; (3) treatment of extracted groundwater; and (4) release of the treated groundwater. Additional ground water monitoring, abandonment of a contaminated production well, continued extraction from a production well, and restriction on the use of a third production well are also proposed as integral parts of the restoration and water reclamation activity. This action only covers short-term measures to reduce the potential for increased health risks from the migration of higher concentrations of contaminants to on- and off-base water supply 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.
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 Department(of Defense's Installation Restoration Program (IRP) is four-phase program to identify past waste disposal practices, evaluate the environmental impacts, propose mitigation measures, and remediate environmental problems. An IRP investigation is currently underway at AF Plant 4, Texas. Phase I, an initial assessment and records search to locate potential environmental problems associated with waste disposal practices, was completed in 1984. Phase II, a field program to investigate potential environmental contamination, has been under way since 1985 under the direction of the U.S. Air Force Occupational and Environmental Health Laboratory (USAFOEHL). Radian Corporation of Austin, Texas, has performed Stage 1 of the Phase II investigation which is reported in this document. Keywords: Installation restoration program, 4, Volatile organics.
AeroVironment Inc. conducted a Phase II, Stage 3 IRP Survey at Mather AFB in Sacramento, California. The objective of this survey was to confirm and quantify the presence and extent of contamination at the 7100 Disposal Area, Air Command and Warning (ACW) Area Disposal Site, West Ditch and in the Northeast Perimeter of the base. These sites had been invesigated in 1985 during a Phase II, Stage I Survey and additional work recommended for all four. During Stage 3, thirty-five groundwater monitoring wells were installed, using standard mud rotary techniques. Seventeen were drilled into the water table aquifer and 18 into the confined aquifer. Two rounds of groundwater samples were collected from 35 Stage 3 wells, 1 Stage 2 well, and 8 Stage 1 wells. One round of samples was collected from base production wells. A geophysical survey and a soil gas survey were also conducted at the ACW and 7100 sites.