Description
Historical activity that resulted
in contamination.
| This is an active PCE drycleaning facility that has been in operation since 1966. It is located in a strip mall in a mixed retail commercial/residential setting.
PCE was formerly stored in an above-ground storage tank (AST) located in the southeastern corner of the facility. A wastewater sample collected from the sanitary sewer in an earlier investigation showed a PCE concentration of 9,610 µg/L. Identified contaminant source areas at the site were: the drycleaning machine, AST, and sanitary sewer lateral. 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 |
460 ppb |
|
| Tetrachloroethene (PCE) |
groundwater |
430 ppb |
|
| Tetrachloroethene (PCE) |
soil |
6,097 ppb |
|
| trans-1,2-Dichloroethene |
groundwater |
7.31 ppb |
|
| Vinyl Chloride |
groundwater |
290 ppb |
|
Site Hydrology
| Deepest Significant
Groundwater Contamination: |
|
57ft bgs |
| Plume Size: |
|
Plume Length: 400ft
Plume Width: 240ft
Plume Thickness: 57ft |
| Average Depth
to Groundwater: |
|
8.5ft |
Lithology and Subsurface Geology
|
|
fine to medium-grained sand with limestone stringers
Depth: 0-20ft bgs
20ft thick
Conductivity: 88ft/day
Gradient: 0.0013ft/ft
|
|
|
fine to medium-grained sand
Depth: 20-58ft bgs
38ft thick
|
|
|
limestone
Depth: 58-70ft bgs
12ft thick
|
Pathways and DNAPL Presence
 Groundwater
 Sediments
Soil
DNAPL Present
|
Remediation Scenario
Cleanup
Goals: |
|
Groundwater: PCE = 3 µg/L, TCE = 3 µg/L, cis 1,2-DCE = 70 µg/L, trans 1,2-DCE = 100 µg/L, vinyl chloride = 1 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 as the soil remedy, because it is an effective technology for removing VOCs from permeable unsaturated soils. Monitored natural attenuation was chosen as the groundwater remedy, because contaminant levels were low in groundwater and reductive dechlorination was actively occurring. It was believed that removing the contaminants from the unsaturated zone in conjuction with the already-occurring reductive dechlorination in groundwater would result in site closure.
Results to date:
SVE system was shut down in April 2004. The system recovered an estimated 4.2 lbs of VOCs. Groundwater monitoring was conducted after shut down of the SVE system.
Groundwater cleanup target levels were met except in samples from monitoring wells located south of the drycleaning facility near the sanitary sewer lateral that served the strip mall.
In May 2006, a camera was run down the sewer line. Numerous cracks and and some partial collapses of sections of sewer pipe were documented.
The City of Hollywood repaired the sewer line, and contaminant concentrations in nearby monitoring wells dropped below cleanup target levels.
Next Steps:
The site has met the No Further Action Criteria and a Site Rehabilitation Order will be issued for the site.
Cost to Design and Implement:
$86,400 for all technologies
|
In Situ Soil Vapor Extraction |
|
Why the technology was selected:
Soil vapor extraction was chosen as the soil remedy, because it is an effective technology for removing VOCs from permeable unsaturated soils. Monitored natural attenuation was chosen as the groundwater remedy, because contaminant levels were low in groundwater and reductive dechlorination was actively occurring. It was believed that removing the contaminants from the unsaturated zone in conjuction with the already-occurring reductive dechlorination in groundwater would result in site closure.
Date implemented:
May 7, 2003
Final remediation design:
Three vapor 4-inch diameter PVC extraction wells screened 3-6 ft bgs. A 3-H.P. Rotron blower. Off gas treated with two 170-lb G.A.C. units. Design flow rate was 55 cfm/well and 3" w.c./well.
Results to date:
SVE system was shut down in April 2004. The system recovered an estimated 4.2 lbs of VOCs. Groundwater monitoring was conducted after shut down of the SVE system.
Groundwater cleanup target levels were met except in samples from monitoring wells located south of the drycleaning facility near the sanitary sewer lateral that served the strip mall.
In May 2006, a camera was run down the sewer line. Numerous cracks and and some partial collapses of sections of sewer pipe were documented.
The City of Hollywood repaired the sewer line, and contaminant concentrations in nearby monitoring wells dropped below cleanup target levels.
Next Steps:
The site has met the No Further Action Criteria and a Site Rehabilitation Order will be issued for the site.
Cost to Design and Implement:
$86,400 for all technologies
|
Ex Situ Carbon Adsorption |
|
Why the technology was selected:
Soil vapor extraction was chosen as the soil remedy, because it is an effective technology for removing VOCs from permeable unsaturated soils. Monitored natural attenuation was chosen as the groundwater remedy, because contaminant levels were low in groundwater and reductive dechlorination was actively occurring. It was believed that removing the contaminants from the unsaturated zone in conjuction with the already-occurring reductive dechlorination in groundwater would result in site closure.
Date implemented:
May 7, 2003
Final remediation design:
Three vapor 4-inch diameter PVC extraction wells screened 3-6 ft bgs. A 3-H.P. Rotron blower. Off gas treated with two 170-lb G.A.C. units. Design flow rate was 55 cfm/well and 3" w.c./well.
Results to date:
SVE system was shut down in April 2004. The system recovered an estimated 4.2 lbs of VOCs. Groundwater monitoring was conducted after shut down of the SVE system.
Groundwater cleanup target levels were met except in samples from monitoring wells located south of the drycleaning facility near the sanitary sewer lateral that served the strip mall.
In May 2006, a camera was run down the sewer line. Numerous cracks and and some partial collapses of sections of sewer pipe were documented.
The City of Hollywood repaired the sewer line, and contaminant concentrations in nearby monitoring wells dropped below cleanup target levels.
Next Steps:
The site has met the No Further Action Criteria and a Site Rehabilitation Order will be issued for the site.
Cost to Design and Implement:
$86,400 for all technologies
|
Ex Situ Soil Removal |
|
Why the technology was selected:
Soil vapor extraction was chosen as the soil remedy, because it is an effective technology for removing VOCs from permeable unsaturated soils. Monitored natural attenuation was chosen as the groundwater remedy, because contaminant levels were low in groundwater and reductive dechlorination was actively occurring. It was believed that removing the contaminants from the unsaturated zone in conjuction with the already-occurring reductive dechlorination in groundwater would result in site closure.
Date implemented:
May 7, 2003
Final remediation design:
Three vapor 4-inch diameter PVC extraction wells screened 3-6 ft bgs. A 3-H.P. Rotron blower. Off gas treated with two 170-lb G.A.C. units. Design flow rate was 55 cfm/well and 3" w.c./well.
Results to date:
SVE system was shut down in April 2004. The system recovered an estimated 4.2 lbs of VOCs. Groundwater monitoring was conducted after shut down of the SVE system.
Groundwater cleanup target levels were met except in samples from monitoring wells located south of the drycleaning facility near the sanitary sewer lateral that served the strip mall.
In May 2006, a camera was run down the sewer line. Numerous cracks and and some partial collapses of sections of sewer pipe were documented.
The City of Hollywood repaired the sewer line, and contaminant concentrations in nearby monitoring wells dropped below cleanup target levels.
Next Steps:
The site has met the No Further Action Criteria and a Site Rehabilitation Order will be issued for the site.
Cost to Design and Implement:
$86,400 for all technologies
|
Costs
Cost
for Assessment:
|
|
$153,900 |
Cost
for Operation and Maintenance:
|
|
$90,500 (includes monitoring)
$7,000 site closure & restoration |
Total
Costs for Cleanup:
|
|
$337,800 |
Lessons Learned
|
Failure to identify continuing sources of contamination from active drycleaning operations will preclude closure at most sites.
|
Contacts
Aaron Cohen
Florida Dept. of Environmental Protection
Bureau of Waste Cleanup, MS 4500
2600 Blair Stone Road
Tallahassee, Florida 32399
850-245-8974
Aaron.Cohen@dep.state.fl.us
Contractor:
Guy Frearson, Consultant
Metcalf & Eddy, Inc.
3740 Executive Way
Miramar, Florida 33025
Phone: (954) 450-5144
E-mail: Guy.Frearson@m-e.aecom.com
|
Site Specific References
Site Assessment Report - 1997
Remedial Action Plan - 2002
SVE System Start-up Report - 2003
Operation & Maintenance Reports
Groundwater Monitoring Reports
|
|
