Drycleaner Site Profiles

Cintas Corporation, Allentown, Pennsylvania

Description
Historical activity that resulted in contamination.

Drycleaning and industrial laundry activies. Commercial property

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


Contaminant Media Concentration (ppb) Nondetect
Tetrachloroethene (PCE) groundwater 403 ppb
Tetrachloroethene (PCE) soil 1,000 ppb

Site Hydrology

Deepest Significant Groundwater Contamination:   90ft bgs
Plume Size:  
Average Depth to Groundwater:   90ft

Lithology and Subsurface Geology

 
  silty soil
Depth: 0-10ft bgs
10ft thick
 
  fractured rock
Depth: 10ft bgs

Pathways and DNAPL Presence

checkGroundwater
Sediments
checkSoil
DNAPL Present

Remediation Scenario

Cleanup Goals:
  50 ugl of PCE
Groundwater contamination was the result of PCE release as a result of former dry cleaning activities at the site. Groundwater samples were obtained for analysis from groundwater monitoring wells. Testing of groudnwater samples indicated the presence of Tetrachloroethene (PCE) at concentrations slightly higher than the Pennsylvania state action limits in MW-6, which is the point of compliance well. No other compound was ever detected above action limits in MW-6 or any other monitoring well at the site.

Technologies

In Situ In-Well Air Stripping
 

Why the technology was selected:
Proven to be most effective remediation system as well as cost efficient.

Date implemented:
In March 2002, MW-2 and MW-3 were converted to ART remedial wells; a third ART well was added approximately 45 feet upgradient from MW-6.The ART Systems were started in May 2002.

Final remediation design:
Three ART Systems installed in 4" wells to depth of 120 ft. In March 2002, MW-2 and MW-3 were converted to ART remedial wells and a third ART well was added approximately 45 feet upgradient from MW-6

Other technologies used:
Different remedial alternatives were evaluated to select the most effective site remedy to comply with Statewide health standards. The ART In Well Technology was determined to be the most effective remedial measure to achieve site closure.

The ART technology combines in-situ air stripping, air sparging, soil vapor extraction, enhanced bioremediation/oxidation, and "Dynamic Subsurface Circulation" in an innovative wellhead system.

Results to date:
Concentrations were reduced to below the action limits by April 2003. Analytical testing of groundwater samples obtained from MW-6 in November 2004 revealed that PCE concentrations had reached below detection limits.

Next Steps:
Final letter from PDNR was issued in 2004. Site completely closed with wells, piping and remediation system removed in Oct. 2005

Cost to Design and Implement:
Approximately $100K

In Situ Recirculating Wells
 

Why the technology was selected:
Proven to be most effective remediation system as well as cost efficient.

Date implemented:
In March 2002, MW-2 and MW-3 were converted to ART remedial wells; a third ART well was added approximately 45 feet upgradient from MW-6.The ART Systems were started in May 2002.

Final remediation design:
Three ART Systems installed in 4" wells to depth of 120 ft. In March 2002, MW-2 and MW-3 were converted to ART remedial wells and a third ART well was added approximately 45 feet upgradient from MW-6

Other technologies used:
Different remedial alternatives were evaluated to select the most effective site remedy to comply with Statewide health standards. The ART In Well Technology was determined to be the most effective remedial measure to achieve site closure.

The ART technology combines in-situ air stripping, air sparging, soil vapor extraction, enhanced bioremediation/oxidation, and "Dynamic Subsurface Circulation" in an innovative wellhead system.

Results to date:
Concentrations were reduced to below the action limits by April 2003. Analytical testing of groundwater samples obtained from MW-6 in November 2004 revealed that PCE concentrations had reached below detection limits.

Next Steps:
Final letter from PDNR was issued in 2004. Site completely closed with wells, piping and remediation system removed in Oct. 2005

Cost to Design and Implement:
Approximately $100K

In Situ Other
 

Why the technology was selected:
Proven to be most effective remediation system as well as cost efficient.

Date implemented:
In March 2002, MW-2 and MW-3 were converted to ART remedial wells; a third ART well was added approximately 45 feet upgradient from MW-6.The ART Systems were started in May 2002.

Final remediation design:
Three ART Systems installed in 4" wells to depth of 120 ft. In March 2002, MW-2 and MW-3 were converted to ART remedial wells and a third ART well was added approximately 45 feet upgradient from MW-6

Other technologies used:
Different remedial alternatives were evaluated to select the most effective site remedy to comply with Statewide health standards. The ART In Well Technology was determined to be the most effective remedial measure to achieve site closure.

The ART technology combines in-situ air stripping, air sparging, soil vapor extraction, enhanced bioremediation/oxidation, and "Dynamic Subsurface Circulation" in an innovative wellhead system.

Results to date:
Concentrations were reduced to below the action limits by April 2003. Analytical testing of groundwater samples obtained from MW-6 in November 2004 revealed that PCE concentrations had reached below detection limits.

Next Steps:
Final letter from PDNR was issued in 2004. Site completely closed with wells, piping and remediation system removed in Oct. 2005

Cost to Design and Implement:
Approximately $100K

Costs

Cost for Assessment:
  Approximately $150-$200K
Cost for Operation and Maintenance:
  Approximately $50K
Total Costs for Cleanup:
  Less than $400K

Lessons Learned

As a technology the ART Systems are very effective and cost efficaint and can be used on the most challeging sites. There is not one perfect technology for all sistuations but the ART System is one of the best we have seen.

Contacts

Steve Pucke
Cintas Corporation
513-965-4902
puckes@cintas.com

Dr. Marco Odah
101000 W 87th St. Suite 204
Overland Park, KS 66212
913=438-4383
modah@artinwell.com

Site Specific References

Steve Pucke
Cintas Corporation