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| - Selective Remediation ofContaminated Sites Using aTwo-Level Multiphase Strategy andGeostatistics
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| - Selective soil remediation aims to reduce costs bycleaning only the fraction of an exposure unit (EU) necessaryto lower the average concentration below the regulatorythreshold. This approach requires a prior stratification ofeach EU into smaller remediation units (RU) which arethen selected according to various criteria. This paperpresents a geostatistical framework to account foruncertainties attached to both RU and EU averageconcentrations in selective remediation. The selection ofRUs is based on their impact on the postremediation probabilityfor the EU average concentration to exceed the regulatorythreshold, which is assessed using geostatistical stochasticsimulation. Application of the technique to a set of 600 dioxinconcentrations collected at Piazza Road EPA Superfundsite in Missouri shows a substantial decrease in the numberof RU remediated compared with single phase remediation.The lower remediation costs achieved by the newstrategy are obtained to the detriment of a higher risk offalse negatives, yet for this data set this risk remains belowthe 5% rate set by EPA region 7.
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