Former Gateway Cleaners, Florissant, Missouri

State Coalition for Remediation of Drycleaners Site Profiles

Description
Historical activity that resulted in contamination.

The site was previously occupied by Gateway Cleaners, a full service dry cleaning company from 1988 to 1998. The facility is located in a strip mall in a mixed commercial setting. Site is now Lamp and Lantern Village The contaminant source areas identified at the drycleaner include the soils beneath the concrete floor. There was minimal to moderate staining on the surrounding walls and floors from the past use of dry cleaning equipment.

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

Contaminant	Media	Concentration (ppb)	Nondetect
cis-1,2-Dichloroethene	groundwater	260 ppb
cis-1,2-Dichloroethene	soil	510 ppb
Tetrachloroethene (PCE)	groundwater	200 ppb
Tetrachloroethene (PCE)	soil	15,900,000 ppb
Trichloroethene (TCE)	groundwater	80 ppb
Trichloroethene (TCE)	soil	250 ppb
Vinyl Chloride	groundwater	180 ppb
Vinyl Chloride	soil		ND

Site Hydrology

Deepest Significant Groundwater Contamination:
Plume Size:
Average Depth to Groundwater:		19ft

Lithology and Subsurface Geology

Brown silty clay to brown fatty clay
Depth: 0-34ft bgs
34ft thick

Pathways and DNAPL Presence

Groundwater

Sediments

Soil

DNAPL Present

Remediation Scenario

Cleanup Goals:

Soil: PCE = 55 mg/kg; TCE = 56 mg/kg
Groundwater: PCE = 0.005 mg/L; TCE = 0.005 mg/L.

Technologies

In Situ Cap

Why the technology was selected:
CAP used to reduce exposure to groundwater contamination.

Date implemented:
12/8/2004

Final remediation design:
CAP used to restrict exposure to soil and groundwater PCE contamination and restriction on land use for non-residential purposes and restriction on groundwater use filed in Restrictive Covenant for site.

Other technologies used:
Restrictive Covenant restricting land use and groundwater use on the site.

Results to date:
Soil removal was completed. Restriction on land use for non-residential purposes and restriction on groundwater use filed in Restrictive Covenant for site. The site was given a certificate of completion on 12/14/2004.

Ex Situ Incineration

Date implemented:
12/8/2004

Final remediation design:
Soil removal was used to remove high levels of PCE in soil because of time issues.

Other technologies used:
Restrictive Covenant restricting land use and groundwater use on the site.

Ex Situ Soil Removal

Why the technology was selected:
Site is redeveloped as strip mall. City utilities provides drinking water. Soil removal was used to remove high levels of PCE in soil because of time issues.

Date implemented:
12/8/2004

Final remediation design:
Soil removal was used to remove high levels of PCE in soil because of time issues.

Other technologies used:
Restrictive Covenant restricting land use and groundwater use on the site.

Costs

Cost for Assessment:
Cost for Operation and Maintenance:
Total Costs for Cleanup:

Lessons Learned

1. Make sure the consultant is aware of the proper cleanup level for the applicable state program.
2. Drill deep wells at the start of site characterization.

Contacts

Mr. Ken Koon
Missouri Department of Natural Resources
Hazardous Waste Program
Brownfields/Voluntary Cleanup Program
Dry Cleaner Remediation Unit
PO Box 176
Jefferson City, MO 65102
(573) 522-1597

Top of Page

U.S. EPA Contaminated Site Cleanup Information (CLU-IN)

State Coalition for Remediation of Drycleaners Site Profiles