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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.
A field Investigation will be conducted at IRP Sites No. 7 (Dry Well off Corrosion Control Building) and No. 8 (Dry Well off Composite Maintenance Building), Montana Air National Guard, Great Falls International Airport, Great Falls, Montana. The Remedial Investigation (RI), completed in May 1997, recommended that an Engineering Evaluation/Cost Analysis be performed at Sites 7 and 8 to determine the significance of the groundwater contamination, and what remedial measures, if any, should be taken. The field investigation will consist of installing four (4) monitoring wells at each site, collecting and analyzing groundwater from each well, and measuring hydraulic properties of the groundwater. The objectives of this investigation will be to assess the extent of groundwater contamination, to determine the potential risk of the contamination to human health and the environment, and to evaluate removal action alternatives.
This cost analysis and environmental impact report presents the results of a comparative analysis of removal action options for the McClellan AFB Operable Unit B. This report documents the removal action selection process and presents the actions selected to mitigate the groundwater. Partial contents: Type of facilities and operational status; Soils; Surface water; Groundwater; Land use; Use, storage, and disposal of chemicals; Potential and known discharges; Contamination distribution; Potential health or environmental impacts; Exposure assessment; Toxicity assessment; Risk characterization; Removal scope; Ground/water extraction; Groundwater treatment plan; Industrial wastewater treatment plan; Sanitary sewer system; Reinjection of treated groundwaters into aquifer; Groundwater monitoring; Analysis of removal action alternatives.
This Volume I us a Site Investigation Report for IRP Site No. 1 and AOC No. 1, California Air National Guard, California Air National Guard, 261st CCS, Sepulveda Air National Guard Station, Van Nuys, CA. This is the first volume of a two volume site investigation report. The sites were investigated under the Installation Restoration Program. Soil samples were collected and analyzed. An Engineering Evaluation/Cost Analysis was recommended to fully delineate the extent of contamination and condut remediation activities, if required. Volume II contains the analytical data, boring logs, and QA/QC logs. Soil samples were collected for analysis of volatile organic compounds (VOCs), semivolatile organic compounds (SVOCs), priority pollutant metals, pesticides and polychlorinated biphenyls (PCBs), and sulfate to determine background levels. Soil vapor samples were collected for determining the optimum number and location of soil sampling borings needed to confirm the absence or presence of soil contamination.
The Installation Restoration Program was initiated by the Air National Guard (ANG) to evaluate potential contamination to the environment caused by past practices at its installations. Two sites were identified at Capital Municipal Airport during the 1990 Preliminary Assessment; the Petroleum, Oils and Lubricants Storage Area (Site 1) and the Old Fire Training Area (Site 2). Information gathered during a 1996 Site Investigation on both sites and 1995 Site Investigation Addendum for Site 2 did not provide adequate information for decision-making. This Field Investigation was designed to fill data gaps. The Tech Memo recommends Site 1 proceed to a No Further Action Decision Document, and Site 2 proceed to an Engineering Evaluation/Cost Analysis (EE/CA). No further field effort is necessary to complete the EE/CA. Vol 1 contains the main text of the report. Vol 2 contains the supporting data.