Drycleaner Site Profiles

Crown Cleaners, Orange City, Florida

Description
Historical activity that resulted in contamination.

PCE Drycleaning operations were conducted at this facility from 1989 until mid-2003 when it was converted to a dry drop-off facility. The facility is located in a shopping center in a retail commercial/residential setting. Contaminant source areas are the soils beneath the floor slab where the drycleaning machine was formerly located and the area around the service door. A sinkhole lake is located approximately 1000 feet north-northwest of the site.

Remediation Status: Site closed


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


Contaminant Media Concentration (ppb) Nondetect
Tetrachloroethene (PCE) groundwater
Tetrachloroethene (PCE) soil
Trichloroethene (TCE) groundwater

Site Hydrology

Deepest Significant Groundwater Contamination:   20ft bgs
Plume Size:   Plume Length: 830ft
Plume Width: 80ft
Plume Thickness: 10ft
Average Depth to Groundwater:   10.97ft

Lithology and Subsurface Geology

 
  fine-grained sand
Depth: 0-34ft bgs
34ft thick
Conductivity: 10.4ft/day
Gradient: 0.015ft/ft
 
  silty, fine-grained sand
Depth: 34-36ft bgs
2ft thick
 
  shell hash
Depth: 36-38ft bgs
2ft thick
 
  shell hash in clay matrix
Depth: 38-40ft bgs
2ft thick
 
  silty, medium plastic clay
Depth: 40-56ft bgs
16ft thick
 
  fine-grained sand
Depth: 56-58ft bgs
2ft thick
 
  medium stiff clay with shell fragments
Depth: 58-64ft bgs
6ft thick
 
  clayey, fine-grained sand with shell fragments
Depth: 64-89ft bgs
25ft thick
 
  sandy limestone
Depth: 89-94ft bgs
5ft thick
 
  silt with minor limestone fragments
Depth: 94-100ft bgs
6ft thick

Pathways and DNAPL Presence

checkGroundwater
Sediments
checkSoil
DNAPL 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
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 due to the low contaminant concentrations present in groundwater and the belief that remediation of unsaturated zone source would result in attenuation of low level contaminants in groundwater.

Next Steps:
A Site Rehabilitation Completion Order was issued for the site on April 20, 2007.

Cost to Design and Implement:
$92,700 for all technologies

In Situ Soil Vapor Extraction
 

Why the technology was selected:
Soil vapor extraction was selected for remediation of the unsaturated zone because it is an effective technology for removing VOCs from permeable undsatured sediments (fine-grained sand in this case).

Date implemented:
Soil Vapor Extraction System start-up: December 1, 2005

Final remediation design:
The SVE system consists of two vapor extraction wells screened form 1.5 - 8 ft BLS. These wells are constructed of 4-inch diameter Schedule 40 PVC with 0.020-inch slot screen. One of the wells is installed beneath the facility floor slab near the drycleaning machine and the other one is installed outside the service door of the facility. The system is powered by a r HP Rotron blower. Off gas is treated via a 200-lb. G.A.C. vessel.

Results to date:
The SVE system was shut down on December 12, 2006 after operating for just over one year. Contaminant concentrations in groundwater dropped below cleanup target levels in the October 2005 sampling event (prior to start-up of SVE system) and remained below cleanup target levels. Confirmatory soil samples were collected on October 4, 2006.

Next Steps:
A Site Rehabilitation Completion Order was issued for the site on April 20, 2007.

Cost to Design and Implement:
$92,700 for all technologies

Ex Situ Carbon Adsorption
 

Date implemented:
Soil Vapor Extraction System start-up: December 1, 2005

Final remediation design:
The SVE system consists of two vapor extraction wells screened form 1.5 - 8 ft BLS. These wells are constructed of 4-inch diameter Schedule 40 PVC with 0.020-inch slot screen. One of the wells is installed beneath the facility floor slab near the drycleaning machine and the other one is installed outside the service door of the facility. The system is powered by a r HP Rotron blower. Off gas is treated via a 200-lb. G.A.C. vessel.

Results to date:
The SVE system was shut down on December 12, 2006 after operating for just over one year. Contaminant concentrations in groundwater dropped below cleanup target levels in the October 2005 sampling event (prior to start-up of SVE system) and remained below cleanup target levels. Confirmatory soil samples were collected on October 4, 2006.

Next Steps:
A Site Rehabilitation Completion Order was issued for the site on April 20, 2007.

Cost to Design and Implement:
$92,700 for all technologies

Costs

Cost for Assessment:
  $82,600
Cost for Operation and Maintenance:
  Total O&M: $22,700
Total Costs for Cleanup:
  $189,100

Contacts

John Sykes, Project Manager
Bureau of Waste Cleanup (MS4520)
Florida Department of Environmental Protection
2600 Blair Stone Road
Tallahassee, Florida 32399-2400

Phone: (850) 245-8960
E-mail: John.SykesIII@dep.state.fl.us

Jay McGovern, PG, Consultant
Tetra Tech EC
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: 2002
Remedial Action Plan: 2005
Constuction Completion Report: 2006
Operation & Maintenance Reports: 2003 - 2007