Drycleaner Site Profiles

B&M Laundromat, Pensacola, Florida

Description
Historical activity that resulted in contamination.

Drycleaning and laundering operations were performed at this facility from 1968 until 1974 when a fire destroyed the building that housed the operation. The facility used PCE. The facility was located in a stand-alone building and was served by a septic tank/drainfield. The site is located in a mixed retail commercial/residential setting. The identified contaminant source areas at the site were the septic tank and the soils beneath the facility floor slab. A sludge sample collected from the septic tank had high concentrations of chlorobenzene (125,700 ug/kg); 1,2-dichlorobenzene (892,860 ug/kg); 1,3-dichlorobenzene (28,255 ug/kg); 1,4-dichlorobenzene (193,593 ug/kg); benzene 97,360 ug/kg; toluene (3,035 ug/kg); ethylbenzene (51,951 ug/kg); and xylenes (247,289 ug/kg);

Remediation Status: In groundwater monitoring


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


Contaminant Media Concentration (ppb) Nondetect
cis-1,2-Dichloroethene groundwater 68.2 ppb
ethylbenzene groundwater 1.33 ppb
ethylbenzene soil 1,072 ppb
Tetrachloroethene (PCE) groundwater 369 ppb
Tetrachloroethene (PCE) soil 231 ppb
Trichloroethene (TCE) groundwater 33.6 ppb
toluene groundwater 41,399 ppb
trans-1,2-Dichloroethene groundwater 1.27 ppb

Site Hydrology

Deepest Significant Groundwater Contamination:   45ft bgs
Plume Size:   Plume Length: 160ft
Plume Width: 70ft
Plume Thickness: 30ft
Average Depth to Groundwater:   14.87ft

Lithology and Subsurface Geology

 
  silty, fine to medium grain sand
Depth: 0-7ft bgs
7ft thick
Gradient: 0.003ft/ft
 
  silt, 20% clay, 20% fine-grained sand
Depth: 7-11ft bgs
4ft thick
 
  silty, very fine to medium-grain sand, 20% clay
Depth: 11-19ft bgs
8ft thick
 
  fine to medium-grain sand, 20% silt; 20% clay
Depth: 19-28ft bgs
9ft thick
 
  silty, medium to coarse-grain sand
Depth: 28-35ft bgs
7ft thick
 
  clay, 10% sand
Depth: 35-37ft bgs
2ft thick
 
  plastic clay
Depth: 37-44ft bgs
7ft thick
 
  coarse sand, some clay
Depth: 44-50ft 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?
  No 
Additional VI Information:
  contaminated soil excavated

Remediation Scenario

Cleanup Goals:
  Groundwater: PCE = 3 ug/l; cis 1,2-DCE = 70 ug/l; Soil: PCE = 30 ug/kg
Remedy Level:
  Interim Action

Technologies

In Situ Monitored Natural Attenuation
 

Why the technology was selected:
Monitored natural attenuation was chosen because groundwater contaminant contrations were relatively low and it is believed that removal of the unsaturated zone source will result in the attenuation of contaminants in groundwater.

Other technologies used:
Septic tank pump out

Results to date:
Since the excavation/removal action, the site has been in monitored natural attenuation. Contaminant concentrations in groundwater have declined. The highest contaminant concentrations found in groundwater samples collected on June 29, 2011 (approximately nine months after the excavation), were 125 ug/l PCE, 31.4 ug/l TCE 68.2 ug/l cis 1,2-DCE, 1.2 ug/l trans 1,2-DCE and 16.9 ug/l vinyl chloride.

Next Steps:
Continue monitored natural attenuation.

Cost to Design and Implement:
Design: $2,800 Implementation: $74,000

Ex Situ Soil Removal
 

Why the technology was selected:
Excavation/removal was chosen because the building had been razed and contaminated soil and the septic tank were accessible.

Date implemented:
October 4-5, 2010: Septic tank pumped out and removed, soil surrounding septic tank and in the area of the razed building that formerly housed the drycleaning operation was excavated to the water table.

Final remediation design:
Approximately 2,700 gallons of sludge/wastewater were vacuumed from the septic tank on October 4, 2010 and were removed from the site for treatment and disposal. The septic tank was removed and shipped offsite for disposal. On October 5, Approximately 591 tons of contaminated soil in the area surrounding the septic tank and in the area of the former location of the building that housed the drycleaning operation was excavated and removed from the site for disposal. The approximate size of the excavation was 40 ft x 15 ft x 16 ft. The excavation was backfilled with clean fill material.

Other technologies used:
Septic tank pump out

Results to date:
Since the excavation/removal action, the site has been in monitored natural attenuation. Contaminant concentrations in groundwater have declined. The highest contaminant concentrations found in groundwater samples collected on June 29, 2011 (approximately nine months after the excavation), were 125 ug/l PCE, 31.4 ug/l TCE 68.2 ug/l cis 1,2-DCE, 1.2 ug/l trans 1,2-DCE and 16.9 ug/l vinyl chloride.

Next Steps:
Continue monitored natural attenuation.

Cost to Design and Implement:
Design: $2,800 Implementation: $74,000

Costs

Cost for Assessment:
  $97,300
Cost for Operation and Maintenance:
  Monitoring: $8,600/year
Total Costs for Cleanup:
 

Contacts

Theresa Pepe, Project Manager
Bureau of Waste Cleanup (MS4520)
Florida Department of Environmental Protection
2600 Blair Stone Road
Tallahassee, Florida 32399-2400
Phone: (850) 245-8966
E-mail: Theresa.Pepe@dep.state.fl.us

Bill Vogelsong, PE, Consultant
Arcadis
2081 Vista Parkway
West Palm Beach, Florida 33411
Phone: (561-6977046
E-mail: WVogelsong@Arcadis-us.com

Site Specific References

Site Assessment Report: 2009
Interim Source Removal Report: November 2010
Groundwater Monitoring Report 2011