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A model was developed that ranks U.S. Air Force installations on the basis of potential for contamination form uncontrolled hazardous material disposal sites. The model is a multiple regression equation formulated from data presented in 77 records search reports for previously studied Air Force installations. Data required for the equation should be readily available from military archives and published soil survey reports. The model can be used to assign priorities to open or closed Air Force installations for initiating Phase I of the Installation Restoration Program. The effects of statistical variance in the multiple regression equation are graphically displayed so that program managers can balance program goals and installation investigation costs. Originator supplied keywords: Installation Restoration Program; Multiple regression equation, Hazard Assessment Rating Methodology (HARM), Hazardous materials, Uncontrolled hazardous waste disposal sites, and Site ranking model.
Pursuant to a congressional request, GAO reviewed 30 contractor-developed Installation Restoration Program Phase I reports, which identify areas of potential environmental contamination due to hazardous waste disposal at Air Force installations, and compared them to the procedures outlined in the Air Force's guidance manual. GAO found that the contractors used the required procedures to determine whether the potential for contamination at a disposal site warranted recommending the site for further work. Each site was given a Hazard Assessment Rating Methodology score that provided the Air Force with a relative indication of the potential for contamination over a wide range of sites and conditions; however, the scores for the sites recommended for further action were inconsistent. The Air Force stated that: (1) many of the contractors had been conservative in assigning scores; and (2) while the method for computing a score primarily uses objective factors, the contractors have to make some subjective evaluations. As a result, the Air Force reviewed the contractors' recommendations and decided to include more sites for further action than were recommended. An Air Force status report indicated that work has begun at 10 of the sites and, after more data analysis, the Air Force decided to do further work at 9 additional sites.
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. (Author).
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.