Record Display for the EPA National Library Catalog


Main Title Pilot Region-Based Optimization Program for Fund-Lead Sites in EPA Region 3. Site Optimization Tracker: Croydon TCE Site, Bristol Towns, Pennsylvania.
CORP Author Environmental Protection Agency, Philadelphia, PA. Region III.
Publisher Dec 2006
Year Published 2006
Report Number EPA/542/R-06/006I;
Stock Number PB2007-108464
Additional Subjects Optimization program ; Fund-lead sites ; EPA Region 3 ; Optimization tracker ; Ground water ; Aquifers ; Contaminants ; Degradation ; Plumes ; Remedial action ; Implementation ; Pennyslvania ; Croydon TCE Site ; Bristol Towns(Pennsylvania) ; Cleanup operations
Internet Access
Description Access URL
Library Call Number Additional Info Location Last
NTIS  PB2007-108464 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 32p
The TCE concentrations at the site are relatively low (a maximum of approximately 16 ug/L relative to the MCL of 5 ug/L), and concentrations continue to decrease. Although this represents significant progress toward aquifer restoration, it also means that the P&T system is having a diminishing effect on removing contaminant mass and progressing toward aquifer restoration. The site team should begin to consider the point at which P&T will provide no additional benefit to the natural processes of dilution and dispersion (and possibly degradation) that are occurring. With P&T operation, TCE concentrations may continue to decline or they may become asymptotic, indicating the impracticability of the P&T system to meet the current (or potentially modified) cleanup standard. It is unlikely that any decision to shut down the P&T system will be made before the site is transferred to the State. As a result, the evaluation team suggests that an exit strategy for the P&T system be deferred until after the site is transferred to the State in November 2005. The State can then work with EPA to consider the concentration trends, determine the effect the P&T system has on reaching the cleanup standard, develop an appropriate cleanup standard, and determine an appropriate point to discontinue P&T.