Drycleaner Site Profiles

Touch of Class Cleaners, Orlando, Florida

Description
Historical activity that resulted in contamination.

PCE drycleaning operations were conducted at this site from 1987 to 1998. A dry drop-off facility currently occupies the bay that formerly housed the drycleaning operation. The site is located in a shopping center in a retail commercial/residential setting. The identified contaminant source area at the site is soil beneath the faciliyt floor slab in the vicinity of the drycleaning machine.

Remediation Status: In groundwater monitoring


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


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

Site Hydrology

Deepest Significant Groundwater Contamination:   22ft bgs
Plume Size:   Plume Length: 180ft
Plume Width: 100ft
Plume Thickness: 15ft
Average Depth to Groundwater:   7.18ft

Lithology and Subsurface Geology

 
  silty, fine-grained sand
Depth: 0-22ft bgs
22ft thick
Conductivity: 2.8ft/day
Gradient: 0.006ft/ft
 
  clay and sandy clay
Depth: 22-38ft bgs
16ft thick
 
  clayey, fine-grained sand and sandy clay
Depth: 38-99ft bgs
61ft thick

Pathways and DNAPL Presence

checkGroundwater
Sediments
checkSoil
checkDNAPL Present

Vapor Intrusion Pathway

Has the potential for vapor intrusion (VI) been evaluated?
  No
Has a vapor mitigation system been installed?
  Yes 
Type of Vapor Mitigation System(s):
  Soil Vapor Extraction

Remediation Scenario

Cleanup Goals:
  Groundwater: PCE = 3 ug/l, TCE = 3 ug/l, cis 1,2-DCE = 70 ug/l

Soil: PCE = 30 ug/kg
Remedy Level:
  Full Scale Remedy

Technologies

In Situ Monitored Natural Attenuation
 

Why the technology was selected:
Monitored natural attenuation was chosen as the groundwater remedy because contaminant concentrations in groundwater were relatively low and some PCE daughter products were present. Our Program experience shows that soil remediation alone can be sufficient to close sites with low contaminant concentrations in groundwater.

Date implemented:
April 5, 2001

Results to date:
The SVE system was turned off in May of 2002. Confirmatory soil sampling showed that the system had effectively remediated contaminated soils. The site was placed in monitored natural attenuatin. The last two consecutive groundwater monitoring events (latest event conducted in July 2009) showed that no contaminants were detected in groundwater in concentrations exceeding cleanup target levels.

Next Steps:
A Site Rehabilitation Completion Order was issued for this site on September 30, 2009.

Cost to Design and Implement:
All technologies: Design: $21,300 Implementation: $66,000

In Situ Soil Vapor Extraction
 

Why the technology was selected:
Soil vapor extraction was chosen as the soil remedial technology because it is an effective technology for removing VOCs from permeable, unsaturated sediments.

Date implemented:
April 5, 2001

Final remediation design:
The SVE system consisted of one 4-inch diameter vertical vapor extraction well screened from 0,5 - 4.5 ft BLS. The well was installed beneath the facility floor slab at the former location of the drycleaning machine. The system is powered by a 3 HP Rotron blower. Off gas is treated via two (2) 170 lb. G.A.C. canisters. Design flow rate is 66 scfm at a vacuum of 63 inches w.c. Estimated radius of influence is approximately 30 ft.

Results to date:
The SVE system was turned off in May of 2002. Confirmatory soil sampling showed that the system had effectively remediated contaminated soils. The site was placed in monitored natural attenuatin. The last two consecutive groundwater monitoring events (latest event conducted in July 2009) showed that no contaminants were detected in groundwater in concentrations exceeding cleanup target levels.

Next Steps:
A Site Rehabilitation Completion Order was issued for this site on September 30, 2009.

Cost to Design and Implement:
All technologies: Design: $21,300 Implementation: $66,000

Ex Situ Carbon Adsorption
 

Date implemented:
April 5, 2001

Final remediation design:
The SVE system consisted of one 4-inch diameter vertical vapor extraction well screened from 0,5 - 4.5 ft BLS. The well was installed beneath the facility floor slab at the former location of the drycleaning machine. The system is powered by a 3 HP Rotron blower. Off gas is treated via two (2) 170 lb. G.A.C. canisters. Design flow rate is 66 scfm at a vacuum of 63 inches w.c. Estimated radius of influence is approximately 30 ft.

Results to date:
The SVE system was turned off in May of 2002. Confirmatory soil sampling showed that the system had effectively remediated contaminated soils. The site was placed in monitored natural attenuatin. The last two consecutive groundwater monitoring events (latest event conducted in July 2009) showed that no contaminants were detected in groundwater in concentrations exceeding cleanup target levels.

Next Steps:
A Site Rehabilitation Completion Order was issued for this site on September 30, 2009.

Cost to Design and Implement:
All technologies: Design: $21,300 Implementation: $66,000

Costs

Cost for Assessment:
  $92,000
Cost for Operation and Maintenance:
  SVE system O&M: $65,300
Total Costs for Cleanup:
  $252,700

Contacts

Walsta Jean Baptiste, Project Manager
Bureau of Waste Cleanup (MS4520)
Florida Department of Environmental Protection
2600 Blair Stone Road
Tallahassee, Florida 32399-2400
Phone: (813) 245-8973
E-mail: Walsta.Jean-Baptiste@dep.state.fl.us

Doug Rodgers, P.E.
Shaw Environmental, Inc.
725 U.S. Highway 301 South
Tampa, Florida 33619-4349
Phone: (813) 612-3623
Doug.Rodgers@shawgrp.com

Site Specific References

Site Assessment Report: March 1999

Remedial Action Plan: August 2000

Construction Completion Report: June 2001

Operation & Maintenance Reports: 2001 - 2002

Groundwater Monitoring Reports: 2000 - 2009