General Information

Site Name and Location:		Ace Quality Cleaners Orlando, Florida, United States
Description: Historical activity that resulted in contamination.		This is an active PCE drycleaning facility that has been in operation since 1967. It is located in a strip shopping center in a mixed retail commercial/residential setting. The contaminant source area is the soils beneath the facility floor slab in the vicinity of the drycleaning machine.

Contaminants:

Contaminants: Contaminants present and the highest amount detected in both soil and groundwater (please avoid giving ranges).		Contaminant Conc in GW Conc. in Soil 1,1-Dichloroethene 10 µg/L Tetrachloroethene (PCE) 10.1 µg/L 67 µg/Kg
Other Contaminants Present: Indicates what other contaminants were found on-site
Deepest Significant Groundwater Contamination:		43 ft bgs
Plume Size:		65 ft x 40 ft x 30 ft

Site Hydrology:

Depth to Groundwater:		15 ft bgs
Lithology and Subsurface Geology:		Surface - 43 ft bgs: fine-grained sand; 43-48 ft bgs: dense clay; 48-94 ft bgs: clayey, fine-grained sand with limestone lenses; 94-100 ft bgs: sandy limestone.
Conductivity:		1.48 ft/day ft/day
Gradient:		0.0098 ft/day

Pathways and DNAPL Presence:

Pathways:		Groundwater Soil
DNAPL Presence:		No

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 = 3.0 µg/l; 1,1-DCE = 7.0 µg/L Soil: PCE = 30 µg/kg

Technologies:

Technologies Used:		In Situ: Monitored Natural Attenuation Soil Vapor Extraction Ex Situ: Carbon Adsorption
Other technologies used:
Why the technology was selected:		Due to low contaminant levels in soil and groundwater, monitored natural attenutation was initially chosen as the remedy at the site. After two and one-half years of monitoring and no decline in contaminant concentrations in groundwater, the decision was made to conduct an active soil gas survey to evaluate the mass of VOCs present in the unsaturated zone in the contaminant source area. Four vapor monitoring points were installed (1.25-inch diameter PVC, screened 5-10 ft BLS). Two of the vapor monitoring points were installed beneath the facility floor slab and two were installed outside the facility (one outside service door and the other one on the side of the faciliy). A portable regenerative blower was run at 12-72 cfm to recovery vapor samples from each vapor monitoring point for a period of one hour for each sampling point. Recovered vapors were monitored with a PID and at the end of each sampling period, a vapor sample was collected for fixed laboratory analysis. Fixed laboratory analysis of these vapor samples found PCE in concentrations ranging from 8.2 to 25 mg/cubic meter. The decision was made to install a SVE system at the site.
Date implemented:		SVE system: September 24, 2004
Final remediation design:		One two-inch diameter Schedule 40 PVC vapor recovery well installed beneath the facility floor slab (screened 2-12 ft BLS). System powered by 1.5 HP Ametek Rotron regenerative blower. off gas treated by 200 lb. G.A.C. unit. System run at 43 scfm with 28 inches applied vacuum.

Results and Next Steps:

Results to date:		The SVE system was shut down on July 1, 2005. An estimated one pound of VOCs was recovered. Groundwater monitoring continued for another year. Groundwater cleanup target levels were achieved in early 2006.
Next Steps:		The site has achieved No Further Action status and a Site Rehabilitation Completion Order will be issued.

Costs:

Cost for Assessment:		$67,500
Cost to Design and Implement:		$65,800 (includes active soil gas survey)
Cost for Operation and Maintenance:		$54,400
Total Costs for Cleanup:		$200,400 (includes $12,700 for closure reporting & site restoration)

Lessons Learned:

Lessons Learned:

1. An active soil gas survey provided a more representative picture of VOC mass distribution in the contaminant source area than conventional soil samplind and analysis. 2. The small amount of contaminant mass recovered by the SVE system was enought to provide a continual contaminant source to shallow groundwater at the site through leaching during seasonal groundwater table fluctuations. 3. At most PCE drycleaning facilities there will be enough PCE in the unsaturated zone under the facility floor slab to continue to cause MCL exceedances in shallow groundwater if not addressed.

Contacts:

Principal Point of Contact:

Karen Milicic, Project Manager Bureau of Waste Cleanup (MS4520) Florida Department of Environmental Protection 2600 Blair Stone Road Tallahassee, Florida 32399-2400 Phone: (850) 245-8931 E-mail: Karen.Milicic@DEP.state.fl.us Mike Lodato, PG GeoSyntec Consultants 14055 Riveredge Drive, Suite 300 Tampa, Florida 33637 Phone: (813) 558-9829 E-mail: mlodato@geosyntec.com

Site Specific References:

Site Specific References:

Contamination Assessment Report - 2001 Limited Remedial Action Plan - 2004 Construction Report - 2004 Operation & Maintenance Reports Groundwater Monitoring Reports

Images:

Images of Site: