Drycleaner Site Profiles

One Hour Dry Cleaners, Coral Springs, Florida

Description
Historical activity that resulted in contamination.

One Hour is a former perchloroethylene (PCE) drycleaning facility that operated from 1985-2000. It occupies space in a strip mall located in a mixed commercial/residential setting. A drainage canal is located approximately 130 ft north of the site. Public water supply wells are located approximately 1,800 ft from the facility. The contaminant source areas are the soils beneath the building floor slab in the vicinity of the former location of the drycleaning machine and the area outside the service door of the facility.

Remediation Status: Site closed


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


Contaminant Media Concentration (ppb) Nondetect
cis-1,2-Dichloroethene groundwater 25,100 ppb
1,1-Dichloroethene groundwater 98.6 ppb
Tetrachloroethene (PCE) groundwater 1,252 ppb
Tetrachloroethene (PCE) soil 10.8 ppb
Trichloroethene (TCE) groundwater 24,300 ppb
trans-1,2-Dichloroethene groundwater 1,425 ppb

Site Hydrology

Deepest Significant Groundwater Contamination:   45ft bgs
Plume Size:   Plume Length: 160ft
Plume Width: 200ft
Plume Thickness: 38ft
Average Depth to Groundwater:   7.5ft

Lithology and Subsurface Geology

 
  Silty, fine to medium-grained sands with shells
Depth: 0-14ft bgs
14ft thick
Conductivity: 14ft/day
Gradient: 0.0003ft/ft
 
  Medium to coarse-grained sand with shells
Depth: 14-18ft bgs
4ft thick
 
  Very fine to fine-grained sand
Depth: 18-50ft bgs
32ft thick

Pathways and DNAPL Presence

checkGroundwater
Sediments
checkSoil
DNAPL Present

Remediation Scenario

Cleanup Goals:
  Groundwater (MCL's): PCE = 3.0 µg/L, TCE = 3.0 µg/L, cis-1,2-DCE = 70 µg/L, trans-1,2-DCE = 100 µg/L, 1,1-DCE = 7.0 µg/L.
Soils (leachability-based /CTLs): PCE = 30 µg/kg

Technologies

Ex Situ Carbon Adsorption
 

Why the technology was selected:
The contaminants are volatile organic compounds in permeable sediments at relatively shallow depths (highest concentrations are at depths ranging from 30-40 ft BLS.

Date implemented:
August 2000

Final remediation design:
The full-scale remediation design is as follows: SVE Wells: 2 Design flow rate: 122 scfm Actual avg. air flow rate: 186 scfm Design vacuum: 123 inches of water column Motor size: 7.5 hp Radius of influence: 50 ft

Next Steps:
The site has met the No Further Action criteria and a Site Rehabilitation Completion Order will be issued.

Cost to Design and Implement:
For all technologies: Design: $36,600 Construction: $204,300

In Situ Air Sparging
 

Why the technology was selected:
The contaminants are volatile organic compounds in permeable sediments at relatively shallow depths (highest concentrations are at depths ranging from 30-40 ft BLS.

Date implemented:
August 2000

Final remediation design:
The full-scale remediation design is as follows: Air Sparging Points: 4 Depth: 40 ft bgs Radius of influence: 30 ft Pressure: 26.7 psig Flow rate: 14.4 scfm Motor size: 5 hp

Results to date:
In August of 2002, the AS/SVE system was shut down. An estimated lbs of contaminants had been recovered. Three monitor wells produced groundwater samples with Cis 1,2-DCE concentrations exceeding the MCL (ranging from 76.6 to 516 ug/l). The highest contaminant concentration was detected in a groundwater sample collected from MW002, located directly outside the service door of the facility. The site was placed in monitored natural attenuation. After 3 years of monitoring, the Cis 1,2-DCE concentration in a groundwater sample collected from MW002 (located outside serive door)was 248 ug/l. The decision was made to modify and re-start the AS/SVE system. Two air sparge wells were installed in the area behind the facility. They were constructed of 2-inch diameter Schedule 40 PVC and screened 37.5-39.5 with 40 micron porous HDPE. An additional lateral vapor extraction well was installed in the area behind the facility. It was constructed of 15 feet of 4-inch Schedule 40 PVC with 0.02-inch slot and installed 2 feet below the pavement. The system was re-started on October 18, 2005 using two new air sparge wells, the new vapor extraction well and the existing vapor extraction well beneath the facility floor slab. The system was operated until November of 2006. The site was placed into post-active remedial monitoring. Contaminant concentrations in groundwater declined to below MCLs. Confirmatory soil sampling found no contaminants in soils in concentrations exceeding cleanup target levels.

Next Steps:
The site has met the No Further Action criteria and a Site Rehabilitation Completion Order will be issued.

Cost to Design and Implement:
For all technologies: Design: $36,600 Construction: $204,300

In Situ Soil Vapor Extraction
 

Why the technology was selected:
The contaminants are volatile organic compounds in permeable sediments at relatively shallow depths (highest concentrations are at depths ranging from 30-40 ft BLS.

Date implemented:
August 2000

Final remediation design:
The full-scale remediation design is as follows: SVE Wells: 2 Design flow rate: 122 scfm Actual avg. air flow rate: 186 scfm Design vacuum: 123 inches of water column Motor size: 7.5 hp Radius of influence: 50 ft

Results to date:
In August of 2002, the AS/SVE system was shut down. An estimated lbs of contaminants had been recovered. Three monitor wells produced groundwater samples with Cis 1,2-DCE concentrations exceeding the MCL (ranging from 76.6 to 516 ug/l). The highest contaminant concentration was detected in a groundwater sample collected from MW002, located directly outside the service door of the facility. The site was placed in monitored natural attenuation. After 3 years of monitoring, the Cis 1,2-DCE concentration in a groundwater sample collected from MW002 (located outside serive door)was 248 ug/l. The decision was made to modify and re-start the AS/SVE system. Two air sparge wells were installed in the area behind the facility. They were constructed of 2-inch diameter Schedule 40 PVC and screened 37.5-39.5 with 40 micron porous HDPE. An additional lateral vapor extraction well was installed in the area behind the facility. It was constructed of 15 feet of 4-inch Schedule 40 PVC with 0.02-inch slot and installed 2 feet below the pavement. The system was re-started on October 18, 2005 using two new air sparge wells, the new vapor extraction well and the existing vapor extraction well beneath the facility floor slab. The system was operated until November of 2006. The site was placed into post-active remedial monitoring. Contaminant concentrations in groundwater declined to below MCLs. Confirmatory soil sampling found no contaminants in soils in concentrations exceeding cleanup target levels.

Next Steps:
The site has met the No Further Action criteria and a Site Rehabilitation Completion Order will be issued.

Cost to Design and Implement:
For all technologies: Design: $36,600 Construction: $204,300

Costs

Cost for Assessment:
  $120,700
Cost for Operation and Maintenance:
  Operation & Maintenance (includes monitoring):$265,700 Decomission system & restore site: $14,800
Total Costs for Cleanup:
  $642,100

Lessons Learned

1. Air compressor problems have been resolved by consulting with the manufacturer.
2. Local government agencies may require remediation equipment to be UL certified.

Contacts

Theresa Pepe, Project Manager
FDEP, Division of Waste Management, Bureau of Waste Cleanup, Hazardous Waste Cleanup Section
2600 Blair Stone Road, MS 4520
Tallahassee, FL 32399-2400
850-245-8927
theresa.pepe@dep.state.fl.us

Contractor:
William Vogelsong, PG
Arcadis G&M, Inc.
2081 Vista Parkway
West Palm Beach, FL 33411
561-697-7000
wvogelsong@arcadis-us.com

Site Specific References

Contamination Assessment Report:11/97
Remedial Action Plan:5/99
Remedial Action Plan Modification: 2/2005
Operation and Maintenance Reports; 2005-2006
Post aMonitoring Reports: