Drycleaner Site Profiles

Dry Clean Inn, Lauderhill, Florida

Description
Historical activity that resulted in contamination.

This is an active PCE drycleaning facility that has been in operation since 1986. The facility is located in a small strip shopping center in a mixed commercial/residential setting. Stormwater at the site is collected in catchment basins and routed to a series of French drains. Two of the catchment basins are located near the service door of the drycleaning facility. Contaminant source areas at the site are the soils beneath the facility floor slab and contaminated sediments in the stormwater catchment basins.

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


Contaminant Media Concentration (ppb) Nondetect
cis-1,2-Dichloroethene groundwater 127 ppb
Tetrachloroethene (PCE) groundwater 80.9 ppb
Tetrachloroethene (PCE) soil 3,200 ppb
Trichloroethene (TCE) groundwater 61.9 ppb
trans-1,2-Dichloroethene groundwater 3.81 ppb
Vinyl Chloride groundwater 3.9 ppb

Site Hydrology

Deepest Significant Groundwater Contamination:   15ft bgs
Plume Size:   Plume Length: 40ft
Plume Width: 80ft
Average Depth to Groundwater:   4ft

Lithology and Subsurface Geology

 
  fine to medium-grained sand interbedded with limestone
Depth: 0-14ft bgs
14ft thick
Conductivity: 103ft/day
Gradient: 0.0024ft/ft
 
  fine to medium-grained sand
Depth: 14-18ft bgs
4ft thick
 
  shell hash
Depth: 18-23ft bgs
5ft thick
 
  fine to medium-grained sand
Depth: 23-52ft bgs
29ft thick
 
  sandy limestone
Depth: 52-71ft bgs
19ft thick

Pathways and DNAPL Presence

checkGroundwater
checkSediments
checkSoil
DNAPL Present

Remediation Scenario

Cleanup Goals:
  Groundwater - MCLs: PCE = 3 µg/l, TCE = 3 µg/l, cis 1,2-DCE = 70 µg/l, trans 1,2-DCE = 100 µg/l, vinyl chloride = 1 µg/l

Soils - leachability cleanup target level: PCE = 30 µg/kg

Technologies

In Situ Monitored Natural Attenuation
 

Why the technology was selected:
Natural attenuation was selected for the groundwater remedy due to the low contaminant cocentrations present in groudwater and the evidence of active reductive dechlorination (PCE degradation products present).

Results to date:
Contaminant concentrations in groundwater were below cleanup targets in the final two monitoring events conducted in February and August of 2001. The critera for No Further Action have been met and a Site Rehabilitation Completion Order was issued on September 19, 2001.

Cost to Design and Implement:
$109,000 for all technologies

In Situ Soil Vapor Extraction
 

Why the technology was selected:
SVE was chosen to remediate contaminated soils beneath the facility floor slab due to the inaccessability of the soils and the efficiency of SVE in removing VOCs from permeable soils.

Date implemented:
SVE system startup - June 28, 2000.

Final remediation design:
The SVE system utilized 2 horizontal extraction wells. One extraction well (VEW-1) was installed benath the alley near the service door of the facility and the other well (VEW-2) was installed beneath the facility floor slab near the drycleaning machine. Depth: VEW-1 3.5 ft bgs; VEW-2 3 ft bgs Screen Length: wells 1 & 2 - 10 ft Blower: Rotron 3 hp. capacity: 83 scfm at design vacuum of 34 in. w.c. Actual Flow Rate: 83 scfm at 14.5 in. w.c. Emissions Treatment: 2-200 lb. GAC vessels in series. Radius of Influence: each well - 25 ft, System radius of influence - 40 ft.

Results to date:
The system was operated for 12 months - until June 30, 2001. The system is estimated to have removed 1.46 lbs. of PCE. Confirmatory soil sampling indicated that contaminant levels in soils in contaminant source areas are below cleanup target levels. Contaminant concentrations in groundwater were below cleanup targets in the final two monitoring events conducted in February and August of 2001. The critera for No Further Action have been met and a Site Rehabilitation Completion Order was issued on September 19, 2001.

Cost to Design and Implement:
$109,000 for all technologies

Ex Situ Carbon Adsorption
 

Why the technology was selected:
SVE was chosen to remediate contaminated soils beneath the facility floor slab due to the inaccessability of the soils and the efficiency of SVE in removing VOCs from permeable soils.

Date implemented:
SVE system startup - June 28, 2000.

Final remediation design:
The SVE system utilized 2 horizontal extraction wells. One extraction well (VEW-1) was installed benath the alley near the service door of the facility and the other well (VEW-2) was installed beneath the facility floor slab near the drycleaning machine. Depth: VEW-1 3.5 ft bgs; VEW-2 3 ft bgs Screen Length: wells 1 & 2 - 10 ft Blower: Rotron 3 hp. capacity: 83 scfm at design vacuum of 34 in. w.c. Actual Flow Rate: 83 scfm at 14.5 in. w.c. Emissions Treatment: 2-200 lb. GAC vessels in series. Radius of Influence: each well - 25 ft, System radius of influence - 40 ft.

Results to date:
The system was operated for 12 months - until June 30, 2001. The system is estimated to have removed 1.46 lbs. of PCE. Confirmatory soil sampling indicated that contaminant levels in soils in contaminant source areas are below cleanup target levels. Contaminant concentrations in groundwater were below cleanup targets in the final two monitoring events conducted in February and August of 2001. The critera for No Further Action have been met and a Site Rehabilitation Completion Order was issued on September 19, 2001.

Cost to Design and Implement:
$109,000 for all technologies

Ex Situ Soil Removal
 

Why the technology was selected:
Excavation was chosen as the most cost-effective method to remove contaminated sediments from the stormwater catchment basins.

Date implemented:
Excavation of contaminated sediments from stormwater catchment basins - July, 1999.

Results to date:
Contaminant concentrations in groundwater were below cleanup targets in the final two monitoring events conducted in February and August of 2001. The critera for No Further Action have been met and a Site Rehabilitation Completion Order was issued on September 19, 2001.

Cost to Design and Implement:
$109,000 for all technologies

Costs

Cost for Assessment:
  $67,000
Cost for Operation and Maintenance:
  $28,000 Groundwater Monitoring: $19,000System Closeout and Site Restoration: $14,000
Total Costs for Cleanup:
  $237,000

Lessons Learned

1. Sites with shallow, low-level contaminant concentrations in groundwater and with a contaminant source area in permeable soils can be effectively remediated with SVE.
2. One of the keys to the effectivness of the SVE system is locating extraction wells in contaminant source areas (generally beneath the facility floor slab at drycleaning facilities).

Contacts

Andrea Bain, Prjoject Manager
Bureau of Waste Cleanup (MS4520)
Florida Department of Environmental Protection
2600 Blair Stone Road
Tallahassee, Florida 32399-2400
Andrea Bain@dep.state.fl.us
(850) 245-8970

Bruce Koenig, Contractor
Metcalf & Eddy
3740 Executive Way
Miramar, Florida 33025
Bruce.koenig@metcalfeddy.com
(954) 450-5201

Site Specific References

1. Site Assessment Report - 9/97
2. Remedial Action Plan - 9/99
3. SVE System Startup Report - 8/2000
4. SVE O&M Reports 2000/2001
5. Natural Attenuation Monitoring Reports 1999-2001