U.S. EPA Contaminated Site Cleanup Information (CLU-IN)

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U.S. Environmental Protection Agency
U.S. EPA Technology Innovation and Field Services Division

State Coalition for Remediation of Drycleaners Site Profiles

Former Giant Wash, McPherson, Kansas

Historical activity that resulted in contamination.

The site operated as a dry cleaning and laundry facility from 1963 to 1965. An investigations of tetrachloroethylene (PCE) detected in two public water supply (PWS) wells in 1987 and 1989 revealed one source of PCE in the groundwater was attributed to the Tidy Laundry Site but that there was another unidentified contributing site. A directory search in 2000 showed the Giant Wash Laundry located upgradient from one PWS well. In 1995, the City of McPherson installed a Packed tower air stripper system that remediates contaminated water from the PWS wells. The Kansas Department of Health and Environment (KDHE) conducted the site investigation and remediation under the authority of the Kansas Drycleaner Environmental Response Act (DERA).

Remediation Status: In active remediation

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

Contaminant Media Concentration (ppb) Nondetect
chloroform groundwater
cis-1,2-Dichloroethene groundwater
1,2-Dichloroethane groundwater
Tetrachloroethene (PCE) groundwater
Tetrachloroethene (PCE) soil
Trichloroethene (TCE) groundwater
trans-1,2-Dichloroethene groundwater

Site Hydrology

Deepest Significant Groundwater Contamination:   105ft bgs
Plume Size:   Plume Length: 900ft
Plume Width: 200ft
Plume Thickness: 15ft
Average Depth to Groundwater:   87.5ft

Lithology and Subsurface Geology

  Fine to coarse sands with interbedded silty clay layers
Depth: 0-28.5ft bgs
28.5ft thick
  Light red lean clay
Depth: 28.5-51ft bgs
22.5ft thick
  Fine to coarse sand
Depth: 51-55ft bgs
4ft thick
  silty clay
Depth: 55-70ft bgs
15ft thick
  weathered shale bedrock
Depth: 70-152ft bgs
82ft thick

Pathways and DNAPL Presence

DNAPL Present

Vapor Intrusion Pathway

Has the potential for vapor intrusion (VI) been evaluated?
How was the site evaluated?
  Soil vapor and/or Sub-slab vapor sampling,Groundwater sampling
Results of VI evaluation:
  The VI pathway was ruled out (or does not exist)
Has a vapor mitigation system been installed?

Remediation Scenario

Cleanup Goals:
  Reduce PCE and TCE groundwater contamination to below EPA Maximum Contaminant Level (MCL) of 5 µg/L.
Remedy Level:
  Full Scale Remedy


In Situ Air Sparging

Why the technology was selected:
O&M cost, effectiveness of the technology, and expected duration of cleanup.

Date implemented:
System start-up, August 2008.

Final remediation design:
A cluster of three vertical SVE wells were planned at three different depths to a total depth of approximately 70 ft bgs. The wells were screened at 10-30 ft bgs, 35-50 ft bgs, and 55-70 ft bgs. Universal RAI Model 24URAI, rotary lobe blower with a design capacity of approximately 70 scfm airflow at 80 in. H2O vacuum.

Results to date:
Due to difficulty in drilling and reaching total depth during installation, only two SVE wells were installed. One is screened from 9-30 ft bgs and the other is screened from 35-60 ft bgs. Roughly 1000 lbs of VOC's have been rememoved from the soil since system start-up, the system is currently in operation.

Next Steps:
Continue with soil remediation and groundwater monitoring.

Cost to Design and Implement:


Cost for Assessment:
Cost for Operation and Maintenance:
Total Costs for Cleanup:

Lessons Learned

Limited access drilling equipment was functional when conditions are favorable. However, due to significant rainfall during the installation of the deep SVE well, surface runoff entered the borehole and caused the annulus to smear off. Installation contractor attempted to rehab the well through the addition of water, surging, and purging of the well screen. Well rehab assisted in cleaning fines from the filter pack, but system needed to operate for a year before the screened interval dried out enough to allow flow-paths to develop and obtain recordable flow at the header.


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