Drycleaner Site Profiles

One Price Drycleaners, Sunrise, Florida

Description
Historical activity that resulted in contamination.

This is an active PCE drycleaning facility that has been operating since 1988. The facility is located in a mixed commercial/residential setting. A drainage canal is located approximately 75 feet southwest of the facility. The nearest public water supply well is located approximately 2000 feet southeast of the facility. The contaminant source area is the soil beneath the building floor slab in the vicinity of the drycleaning machine.

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


Contaminant Media Concentration (ppb) Nondetect
cis-1,2-Dichloroethene groundwater 97 ppb
1,1-Dichloroethene groundwater 1.98 ppb
Tetrachloroethene (PCE) groundwater 2.8 ppb
Tetrachloroethene (PCE) soil 5,300 ppb
Trichloroethene (TCE) groundwater 0.47 ppb
Vinyl Chloride groundwater 41 ppb

Site Hydrology

Deepest Significant Groundwater Contamination:   85ft bgs
Plume Size:   Plume Length: 200ft
Plume Width: 1,000ft
Average Depth to Groundwater:   6.5ft

Lithology and Subsurface Geology

 
  fine to medium-grained sand
Depth: 0-3.5ft bgs
3.5ft thick
Conductivity: 75ft/day
Gradient: 0.003ft/ft
 
  limestone with medium-grained sand interbeds
Depth: 3.5-10ft bgs
6.5ft thick
 
  fine to coarse-grained sand with shells
Depth: 10-21ft bgs
11ft thick
 
  silty, fine to medium-grained sand with some silty clay
Depth: 21-29ft bgs
8ft thick
 
  limestone with medium-grained sand interbeds
Depth: 29-96ft bgs
67ft thick

Pathways and DNAPL Presence

checkGroundwater
Sediments
checkSoil
DNAPL Present

Remediation Scenario

Cleanup Goals:
  Groundwater - MCLs: PCE = 3.0 µg/l, TCE = 3.0 µg/l, cis 1,2-DCE = 70 µg/l, 1,1-DCE = 7.0 µg/l, vinyl chloride = 1.0 µg/l

Soil: Cleanup target leachability standard: PCE = 30 ug/kg

Technologies

In Situ Monitored Natural Attenuation
 

Why the technology was selected:
Natural attenuation with monitoring was selected as the groundwater remedy because groundwater contaminant concentrations were well below natural attenuation default concentrations.

Date implemented:
February 9, 2000

Cost to Design and Implement:
$45,500 for all technologies

In Situ Soil Vapor Extraction
 

Why the technology was selected:
SVE is a cost effective technology for removing VOCs from permeable unsaturated soils.

Date implemented:
February 9, 2000

Final remediation design:
Two SVE and two air inlet wells were installed beneath the building floor slab using hand augers. Piping from the wells extended to the ceiling of the facility where it was routed out the back of the building to the treatment compound. Wells: 2 extraction, 2 air inlet Depth: SVE-1 screened 0.5-6 ft bgs; SVE-2 screened 0.5-8 ft bgs; air inlet wells screened 0.5-3.5 ft bgs. SVE motor size; 5.0 hp Rotron blower Design flowrate: 100 cfm at design vacuum of 70 in. w.c. Air inlet wells blower: 2.5 h.p. Rotron blower Design flowrate: 60 cfm at design vacuum of 80 in. w.c. Radius of influence: 80 ft Emissions treatment: 200 lb. GAC canister The system operated for 6 months - until August 9, 2000. For the first month of operation, all four wells, SVE and air inlet wells, were piped into the SVE system to reduce the possibility of inadvertent contamiant movement near the air inlet wells. In March of 2000, the air inlet wells were connected to the air inlet blower to eliminate any "dead zones" in the unsaturated zone.

Results to date:
Confirmatory soil sampling indicated that contaminant concentrations in soils are below soil cleanup target levels. An estimated 6.8 lbs. of PCE was removed by the SVE system. Contaminant concentrations in groundwater samples collected from monitor wells were below cleanup target levels for two consecutive monitoring events. Criteria for No Further Action have been met at the site and remediation has been completed. A Site Rehabilitatioh Completion Order was issued for the site on July 2, 2001.

Cost to Design and Implement:
$45,500 for all technologies

Costs

Cost for Assessment:
  $144,500
Cost for Operation and Maintenance:
  $66,500 Site Restoration: $6,500
Total Costs for Cleanup:
  $ 263,000

Lessons Learned

1. Local government agencies may require remediaiton equipment to be UL certified.
2. Installation of SVE wells inside the drycleaning facility is an option that should be considered.
3. Using air injection wells increases the pressure gradient and reduces the dead space between recovery wells, allowing for more efficient recovery of VOCs.

Contacts

Jennifer Farrell, Environmental Manager
Bureau of Waste Cleanup, MS 4520
2600 Blair Stone Road
Tallahassee, Fl 32399-2400
Phone: 850-245-8937
Jennifer.Farrell@dep.state.fl.us

Contractor: Richard E. Lewis, PhD, P.E.
HSA Environmental Engineers & Scientists
4019 East Fowler Avenue
Tampa, Fl 33617
rlewis@hsa-env.com

Site Specific References

1. ontamination Assessment Report 7/98
2. Remedial Action Plan 8/99
3. Remediaiton Performance Report 4/2000
4. SVE Summary Closure Report 11/2000