Drycleaner Site Profiles

Master Cleaners, Winter Haven, Florida

Description
Historical activity that resulted in contamination.

This is an active PCE drycleaning facility that has been in operation since 1988. The facility is located in a shopping center in a mixed retail commercial/residential setting. The contaminant source area is the soil beneath the facility floor slab in the vicinity of the drycleaning machine.

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 58 ppb
Tetrachloroethene (PCE) groundwater 870 ppb
Tetrachloroethene (PCE) soil 164 ppb
Trichloroethene (TCE) groundwater 475 ppb
Trichloroethene (TCE) soil 7 ppb
trans-1,2-Dichloroethene groundwater 10 ppb

Site Hydrology

Deepest Significant Groundwater Contamination:   15ft bgs
Plume Size:   Plume Length: 120ft
Plume Width: 70ft
Plume Thickness: 7ft
Average Depth to Groundwater:   8.41ft

Lithology and Subsurface Geology

 
  very fine to medium-grained sand
Depth: 0-33ft bgs
33ft thick
Conductivity: 2.5ft/day
Gradient: 0.009ft/ft
 
  sandy clay
Depth: 33-75ft bgs
42ft 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:
  Groundwater: PCE = 3 µg/L, TCE = 3 µg/L, cis 1,2-DCE = 70 µg/L, trans 1,2-DCE = 70 µg/L.

Soil: PCE = 30 µg/kg, TCE = 30 µg/kg

Technologies

In Situ Monitored Natural Attenuation
 

Why the technology was selected:
Soil vapor extraction was chosen because it is an effective technology for removing VOCs from permeable unsaturated soils. Monitored natural attenuation was chosen, because reductive dechlorination was occuring in groundwater, and because it was believed that given the limited area of groundwater contamination, operation of a SVE system would be sufficient to close the site.

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

Cost to Design and Implement:
$47,100 for all technologies

In Situ Soil Vapor Extraction
 

Why the technology was selected:
Soil vapor extraction was chosen because it is an effective technology for removing VOCs from permeable unsaturated soils. Monitored natural attenuation was chosen, because reductive dechlorination was occuring in groundwater, and because it was believed that given the limited area of groundwater contamination, operation of a SVE system would be sufficient to close the site.

Date implemented:
May 27, 2004

Final remediation design:
Four 2-inch diameter Schedule 40 PVC vapor extraction wells, screened 1-5 ft bgs with 0.02-inch screen. Three of these wells installed beneath the facility floor slab and the fourth well installed outside service door. Three 2-inch vacuum monitoring wells. 15 HP rotary lobe blower (200 scfm @ 10" Hg). Off gas treatment - 200 lb. G.A.C. unit.

Results to date:
SVE system operated at an average flow rate of 100 scfm under a vacuum of 30 to 35 inches of w.c. SVE system was shut down on August 24, 2005. An estimated 7.34 lbs of VOCs recovered.

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

Cost to Design and Implement:
$47,100 for all technologies

Costs

Cost for Assessment:
  $89,000
Cost for Operation and Maintenance:
  $75,900(includes monitoring) $7,000 (site closure & restoration)
Total Costs for Cleanup:
  $219,000

Lessons Learned

1. Contaminant concentrations in groundwater samples collected beneath the facility floor slab were two orders of magnitude higher than levels in groundwater samples collected beneath the parking lot of the shopping center. Without the installation of three monitoring wells beneath the floor slab of the shopping center, the magnitude and the extent of groundwater contamination would have been underestimated.

Contacts

Nancy Murchison, Project Manager
Bureau of Waste Cleanup (MS4520)
Florida Department of Environmental Protection
2600 Blair Stone Road
Tallahassee, Florida 32399-2400
Phone: (850) 245-8990
E-maili: Nancy.Murchison@DEP.state.fl.us

Contractor:
Gregg Roberts, PG
Shaw Environmental
725 U.S. Highway 301 South
Tampa, Florida 33619-4349
Phone: (813) 612-3687
E-mail: Greg.Roberts@shawgrp.com

Site Specific References

Contamination Assessment Report - August 1999

Remedial Action Plan - May 2003

Operation & Maintenance Reports - 2004 - 2005.

Operation & Maintenance Reports 2004/2005