Drycleaner Site Profiles

Dryclean Pro, Palm Beach Gardens, Florida

Description
Historical activity that resulted in contamination.

PCE drycleaning opertions were conducted at this site from 1993 to January 2005. The contaminant floor slab was the drycleaning machine. The facility is located in a strip mall in a retail commercial/residential setting.

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
Tetrachloroethene (PCE) groundwater
Tetrachloroethene (PCE) soil
Trichloroethene (TCE) groundwater

Site Hydrology

Deepest Significant Groundwater Contamination:   50ft bgs
Plume Size:   Plume Length: 105ft
Plume Width: 75ft
Plume Thickness: 45ft
Average Depth to Groundwater:   4ft

Lithology and Subsurface Geology

 
  fine-grained sand
Depth: 0-8ft bgs
8ft thick
Conductivity: 14ft/day
Gradient: 0.00056ft/ft
 
  silty, fine-grained sand
Depth: 8-18ft bgs
10ft thick
 
  fine-grained sand with shells interbedded with silty, fine-grained sand with shells
Depth: 18-100ft bgs
82ft 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:
  Soil: PCE = 30 ug/kg
Groundwater: PCE = 3 ug/l, TCE = 3 ug/l, Cis 1,2-DCE = 70 ug/l
Remedy Level:
  Full Scale Remedy

Technologies

In Situ Soil Vapor Extraction
 

Why the technology was selected:
Soil vapor extraction was selected beacause it is an effective technology for removing VOCs from permeable unsaturated sediments. Soil is cmposed of fine-grained sands.

Date implemented:
July 10, 2002

Final remediation design:
SVE system consists of two horizontal vapor extraction wells. One 15 foot section of screened was installed at a depth of two and one-half feet beneath the facility floor slab and the other vapor extraction well (40 foot screen) was installed just outside the southwall of the facility. The system was powered by a 5 HP Rotron blower. Off gas was treated via two 500 lb. carbon vessels. Design flow rate for the two vapor extraction wells was 10 cfm and 20 cfm.

Results to date:
Due to problems with water entrainment in the SVE lateral installed outside the building, (problem with sprinkler system), the system was modified and a vertical vapor extraction well was installed beneath the facilty floor slab adjacent to the drycleaning machine. This well was screened 1-4 beneath the floor slab. The system was operated until January 4, 2008. It recovered an estimated 11.2 lbs. of VOCs. Confirmatory soil sampling was conducted in August 2007. Consecutive groundwater monitoring events conducted in October 2008 and January 2009 found no contaminants in groundwater samples in concentrations exceeding MCLs or Groundwater Cleanup Target Levels. A Site Rehabilitation Completion Order was issued for the site on February 27, 2009.

Cost to Design and Implement:
Design: $17,900 Implementation: $63,000

Ex Situ Carbon Adsorption
 

Date implemented:
July 10, 2002

Final remediation design:
SVE system consists of two horizontal vapor extraction wells. One 15 foot section of screened was installed at a depth of two and one-half feet beneath the facility floor slab and the other vapor extraction well (40 foot screen) was installed just outside the southwall of the facility. The system was powered by a 5 HP Rotron blower. Off gas was treated via two 500 lb. carbon vessels. Design flow rate for the two vapor extraction wells was 10 cfm and 20 cfm.

Results to date:
Due to problems with water entrainment in the SVE lateral installed outside the building, (problem with sprinkler system), the system was modified and a vertical vapor extraction well was installed beneath the facilty floor slab adjacent to the drycleaning machine. This well was screened 1-4 beneath the floor slab. The system was operated until January 4, 2008. It recovered an estimated 11.2 lbs. of VOCs. Confirmatory soil sampling was conducted in August 2007. Consecutive groundwater monitoring events conducted in October 2008 and January 2009 found no contaminants in groundwater samples in concentrations exceeding MCLs or Groundwater Cleanup Target Levels. A Site Rehabilitation Completion Order was issued for the site on February 27, 2009.

Cost to Design and Implement:
Design: $17,900 Implementation: $63,000

Costs

Cost for Assessment:
  $91,600
Cost for Operation and Maintenance:
 
Total Costs for Cleanup:
 

Lessons Learned

The high PCE concentrations found in groundwater were in samples collected at the top of the water table in the near vicinity of the drycleaning machine. During assessment activities, soil borings in the contaminant source area are generally deepened into the top of the water table where groundwater samples are collected. Generally, these groundwater samples have the highest contaminant concentrations of all the groundwater samples collected during assessment activities.

Contacts

John Sykes, Project Manager
Bureau of Waste Cleanup
Florida Department of Environmental Protection
2600 Blair Stone Road
Tallahassee, Florida 23399-2400
Phone: (850) 245-8960
E-mail: John.Sykes@dep.state.fl.us

Jay McGovern, PG
TetraTech-Floster Wheeler
759 South Federal Highway, Suite 100
Stuart, Florida 34994-2936
Phone: (772) 781-3409
E-mail: Jay.McGovern@tteci.com

Site Specific References

Site Assessment Report: September 2001

Remedial Action Plan: March 2002

Construction Completion Report: August 2002

Operation & Maintenance/Monitoring Reports: 2002-2008.