In Situ Treatment Using Cosolvent Flushing, Thermal Desorption, or In-Well Air Stripping at Four Drycleaner Sites

Site Name:

Multiple (4) Dry Cleaner Sites

Location:

- Marine Corps Base Camp Lejeune, Building 25, NC
- Cedarburg Drycleaners, Cedarburg, WI
- Former Nu Look One Hour Cleaners, Coral Springs, FL
- Former Sages Drycleaners, Jacksonville, FL

Period of
Operation:

- Marine Corps Base Camp Lejeune, Building 25- March 15 - August 15, 1999
- Cedarburg Drycleaners - Not specified
- Former Nu Look One Hour Cleaners - 30 days (specific dates not specified)
- Former Sages Drycleaners - Not specified

Cleanup
Type:

Field demonstrations

Technology:
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Cleanup Authority:
- Cedarburg Drycleaners, State cleanup
- all others not specified

Contacts:
Varied by site

Contaminants:
Chlorinated Solvents:
- All of the sites were contaminated with PCE and TCE
- Concentrations in groundwater varied by site ranging from 1.9 to 170 mg/L for PCE and 0.8 to 34 mg/L for TCE.
- One site (Cedarburg Drycleaners) also reported soil contamination with PCE (highest concentration 21 mg/kg) and TCE (highest concentration 0.3 mg/kg).

Waste Source:
Waste and wastewater from drycleaning operations

Type/Quantity of Media Treated:
- Groundwater plume areas ranged from 0.27 to 17 acres. The deepest reported plume went to 92 feet below ground surface. Actual treatment areas ranged from 6,000 to 150,000 cubic feet for groundwater treatments. At the Cedarburg Drycleaners site, the 100 cubic feet of soil were treated.

Purpose/Significance of Application:
Field demonstrations of in situ technologies for the remediation of chlorinated solvents in soil and groundwater at drycleaner facilities

Regulatory Requirements/Cleanup Goals:
The Cedarburg Drycleaners site reported a cleanup goal of less than 6 mg/kg PCE in soil based on state requirements. Cleanup goals for the other sites were not reported.

Results:
- At the Building 25, Camp Lejeune Marine Corps Base site, 72% (74 - 88 gallons) of the DNAPL in the treatment zone were removed. However, DNAPL was not removed from low permeability areas of the treatment zone. Test results indicated that the technology is not effective for soils with a permeability of less than 1.4 feet per day.
- At the Cedarburg Drycleaners site, soil PCE concentrations were reduced to below 0.4 mg/kg. However, treatment was limited because the unit used could not penetrate deep enough to reach all contamination.
- At the Former Nu Look One Hour Cleaners site, a 75% reduction in volatile organic compounds was achieved in a 62-foot radius around the in-well air stripping unit. Slight rebounds of PCE were observed 6 months after completion of the demonstration.
- At the Former Sages Drycleaners site, 63% (11 gallons) of the DNAPL in the treatment zone were removed. Residual ethanol remaining after the flushing process reportedly enhanced biodegradation of chlorinated compounds.

Cost Factors:
Reported costs:
- Building 25, Camp Lejeune Marine Corps Base - Not reported
- Cedarburg Drycleaners design and implementation costs - $48,000 for soil treatment, $44,000 for groundwater treatment
- Former Nu Look One Hour Cleaners total costs- $193,000
- Former Sages Drycleaners design and implementation costs - $440,000

Description:
Field demonstrations of in situ treatment technologies were conducted at four drycleaner sites drycleaner sites contaminated with TCE and PCE as the primary contaminants. The technologies demonstrated included cosolvent flushing (2 sites), thermal desorption, and in-well air stripping. The Cedarburg Drycleaners site reported a cleanup goal of less than 6 mg/kg PCE in soil based on state requirements. Cleanup goals for the other sites were not reported.