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At Sandia National Laboratories, an Environmental Restoration Program is underway to restore areas of the lab that were previously used for experimental purposes. One of these areas, the Lead Firing Site (ER Site 91) was the site of large-scale explosive experiments that spread lead across the site. The future land-use scenarios being considered for the Lead Firing Site were both industrial and residential. The respective cleanup goals for these two scenarios were 2000 and 400 ppm.
Geostatistical simulation and probability mapping were used to determine the volume of soil that would have to be removed for each cleanup scenario under a range of acceptable probabilities for not meeting the cleanup goal. At an estimated remediation cost of $545/yd3, the estimated remediation costs were calculated from the remediation volumes. The differences in remediation cost between the two cleanup goals is roughly 6-7 million dollars at low probabilities of not meeting the cleanup goal. Results of this study were used in discussions with a Citizens Advisory Board to help determine the final remediation plan.
Papers:
- McKenna, S.A., 1998, Geostatistical Approach for Managing Uncertainty in Environmental Remediation of Contaminated Soils: Case Study, Environmental and Engineering Geoscience, Vol. IV, No. 2, Summer 1998, pp. 175-184.
- McKenna, S.A., 1996, Combining Geostatistics and Geographic Information Systems to Facilitate Risk-Based Decisions in Environmental Remediation, (abstract), presented at the Geological Society of America Annual Meeting, Oct 28-31, Denver Colorado.
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