Drycleaner Site Profiles

Colonial Cleaners (NY), Tompkins County, New York

Description
Historical activity that resulted in contamination.

Colonial Cleaners is a drycleaning business located about half a mile north of the Village of Lansing, NY, on Route 34 (East Shore Drive). Perchloroethylene (PCE) was used as the drycleaning solvent in the business operation. A sample taken from an on-site drinking water well confirmed PCE contamination at a level exceeding 2,000 µg/L. A neighbor's well located slightly downgradient from the property was sampled by the Tompkins County Health Department and was also found to be contaminated at 31.9 µg/L. The Village of Lansing's water supply main on East Shore Drive has been extended and connected to the affected residences. A third downgradient homeowner's well that is not currently being used for drinking water was also sampled and found to be contaminated at lower levels. Property inspections, conducted by Department of Environmental Conservation and Department of Health representatives in 1990, noted the presence of distressed vegetation in one portion of the property, and a faint odor of PCE near the building. No vapor migration into the building or into adjacent structures has been identified to date.

Contaminants
Contaminants present and the highest amount detected in both soil and groundwater.


Contaminant Media Concentration (ppb) Nondetect
Tetrachloroethene (PCE) groundwater 9,600 ppb
Tetrachloroethene (PCE) soil 440,000 ppb
Trichloroethene (TCE) groundwater 90 ppb
1,2-Dichloroethene groundwater 140 ppb

Site Hydrology

Deepest Significant Groundwater Contamination:   12ft bgs
Plume Size:   Plume Length: 200ft
Plume Width: 250ft
Average Depth to Groundwater:   6ft

Lithology and Subsurface Geology

 
  topsoil
Depth: 0.5-1ft bgs
0.5ft thick
 
  Low permeability silty clay
Depth: 1-1.5ft bgs
0.5ft thick
 
  low permeability gravely silty clay
Depth: 1.5-2.5ft bgs
1ft thick
 
  fractured bedrock
Depth: 2.5ft bgs

Pathways and DNAPL Presence

checkGroundwater
Sediments
checkSoil
DNAPL Present

Remediation Scenario

Cleanup Goals:
  5 µg/L for water; 1.4 mg/kg for soil

Technologies

In Situ Soil Vapor Extraction
 

Date implemented:
The sub-floor vent system was installed in 1999 to treat soils beneath the building slab.

Final remediation design:
There have been 4 IRMs at this site to date. Th IRMs involved excavation of contaminated soil, construction of a groundwater pump-and-treat system, and construction of two SVE systems. In 1998, contaminated soil was removed and placed on a liner with extraction piping within the contaminated soil. A pole barn was constructed over the treatment system in 2000. The contaminated soil has been treated on-site with an ex situ SVE system. The remediated soil (after confirmatory sampling) was left in place to become the floor of a boat storage barn. Contaminated soil beneath the drycleaning building is being treated with a soil venting system installed in 1999. A "no further action" ROD was issued in March 2001, but the IRM treatment systems continue to be operated.

Results to date:
Soils beneath the building will be resampled once extracted vapor concentrations reach asypmptotic levels.

Next Steps:
The groundwater system continues to operate during non-winter months.

Cost to Design and Implement:
not available

Ex Situ Pump and Treat
 

Date implemented:
The pump-and-treat system began operation in June 1998.

Final remediation design:
There have been 4 IRMs at this site to date. Th IRMs involved excavation of contaminated soil, construction of a groundwater pump-and-treat system, and construction of two SVE systems. In 1998, contaminated soil was removed and placed on a liner with extraction piping within the contaminated soil. A pole barn was constructed over the treatment system in 2000. The contaminated soil has been treated on-site with an ex situ SVE system. The remediated soil (after confirmatory sampling) was left in place to become the floor of a boat storage barn. Contaminated soil beneath the drycleaning building is being treated with a soil venting system installed in 1999. A "no further action" ROD was issued in March 2001, but the IRM treatment systems continue to be operated.

Results to date:
Immediate - Extension of the water supply removed the exposure from drinking contaminated groundwater. Groundwater - In August 1998, after 2 months of operation, PCE concentrations had dropped to 64 µg/L. In February 1999, after the system had been shut down for two months, PCE concentrations had dropped to 2 µg/L, but concentrations of 1,2-DCE and TCE (breakdown products) had risen to 42 µg/L and 15 µg/L respectively. October 2003 data showed PCE concentrations of 380 µg/L, indicating a continuing source.

Next Steps:
The groundwater system continues to operate during non-winter months.

Cost to Design and Implement:
not available

Ex Situ Soil Vapor Extraction
 

Date implemented:
1998

Final remediation design:
There have been 4 IRMs at this site to date. Th IRMs involved excavation of contaminated soil, construction of a groundwater pump-and-treat system, and construction of two SVE systems. In 1998, contaminated soil was removed and placed on a liner with extraction piping within the contaminated soil. A pole barn was constructed over the treatment system in 2000. The contaminated soil has been treated on-site with an ex situ SVE system. The remediated soil (after confirmatory sampling) was left in place to become the floor of a boat storage barn. Contaminated soil beneath the drycleaning building is being treated with a soil venting system installed in 1999. A "no further action" ROD was issued in March 2001, but the IRM treatment systems continue to be operated.

Results to date:
Approximately 260 tons of contaminated soil was removed for ex situ treatment and remediated.

Next Steps:
The groundwater system continues to operate during non-winter months.

Cost to Design and Implement:
not available

Costs

Cost for Assessment:
  not available
Cost for Operation and Maintenance:
  not available
Total Costs for Cleanup:
 

Contacts

Jim Harrington
New York Department of Environmental Conservation
11th Floor
625 Broadway
Albany, New York 12233-7012
518-402-9755
518-402-9722 (fax)
jbharrin@gw.dec.state.ny.us

Site Specific References

available on microfilm
1. January 1996, Focused Remedial Investigation Workplan, C&H Engineers P.C.
2. June 1997, Focused Remedial Investigation Report, C&H Engineers P.C.
3. January 1998, IRM Data Report, C&H Engineers P.C.
4. August 1998, IRM Data Report, C&H Engineers P.C.
5. February 2001, Proposed Remedial Action Plan
6. March 2001, Record of Decision and Responsiveness Summary