Abstracts of Remediation Case Studies, Volume 7 - Federal ...

Soil Vapor Extraction (SVE) and Monitored Natural Attenuation (MNA) at Three
Drycleaner Sites, Various Locations (continued)
Regulatory Requirements/Cleanup Goals:
Soil
For two sites, cleanup goals were based on state regulatory standards which included 0.03 mg/kg leachable PCE. For
the third site, the cleanup goal for soil was the U.S. EPA target risk range (actual values not specified).
Groundwater
Cleanup goals were based on drinking water MCLs, which was specified for 2 sites as 3.0 µg/L for PCE and TCE,
70 µg/L for cis-1,2-DCE, 100 µg/L for trans-1,2-DCE, and 1.0 µg/L for vinyl chloride.
Results:
All the sites reported that SVE reduced PCE in soils to below cleanup levels.
Two sites (Dry Clean Inn and Former Dollar Cleaners) reported that contaminant concentrations in groundwater were
below cleanup target levels in the last two monitoring events. Both sites received Site Rehabilitation Completion
Orders. No information was provided on the results of MNA at the third site.
Costs:
Design and implementation costs for SVE systems ranged from $109,000 to $135,000, and annual O&M costs for SVE
systems ranged from $28,000 to $30,000.
Description:
SVE and MNA was conducted at three drycleaner sites contaminated with chlorinated solvents from leaks, spills, or
dumping of drycleaning solvents or wastewaters. All three sites reported that SVE reduced PCE concentrations in soil to
below cleanup levels. Two sites reported that contaminant concentrations in groundwater had been reduced by MNA to
below cleanup levels in the last two monitoring events. Both sites received Site Rehabilitation Completion Orders.
Information on groundwater contaminant concentrations for the third site was not provided. Reported design and
maintenance costs for SVE ranged from $109,00 to $135,000. Reported O&M costs for SVE systems ranged from $28,000
to $30,000.
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