SHUTDOWN PROCESS FOR REMEDIATION SYSTEMS: ABSTRACT
As a Comprehensive Environmental Response, Compensation, and Liability Act
(CERCLA) National Priority List site, Fort Wainwright, Alaska, has undergone
extensive remedial investigation and subsequent treatment to restore contaminated
soil and groundwater to safe levels. Treatment systems were installed at various
contaminated areas beginning in the mid-1990's and now, several years later,
an approach must be developed to bring these systems off- line. The purpose
of this paper is to develop a methodology for shutting down treatment systems,
including determining the optimal time to shutdown a treatment system and the
steps to take following the shutdown. Shutting down a treatment system at the
most appropriate time is the critical factor, as demonstrated below. If contaminants
rebound, the system was shut down prematurely; however, if contaminants do not
rebound, the system may have been run longer than necessary. To develop a methodology
for shutting down treatment systems, including the optimal time to shutdown
a treatment system.
Four factors examined in development of a shutdown process:
- System's operational history
- Remedial progress
- Continued cost-effectiveness
- Post-shutdown monitoring programs
Two representative treatment systems studied for this paper - Eight-Car Header
and Valve Pit C
Keywords: Remediation; Shutdown; Soil contamination; Soil vapor extraction;
Rebound
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