Former Serry's Cleaners, Corvallis, Oregon

State Coalition for Remediation of Drycleaners Site Profiles

Description
Historical activity that resulted in contamination.

Serry's Cleaners operated at the site from the mid 1960s to 2001, when the cleaners closed, and the building was converted to an Asian food market. Historical spills and/or leaks have resulted in contamination of the shallow soil and shallow groundwater beneath and surrounding the building. The site is in a mixed residential and commercial area, with residential bordering the site on two sides and roadways on the other two.

Remediation Status: In groundwater monitoring

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

Contaminant	Media	Concentration (ppb)
cis-1,2-Dichloroethene	groundwater	3,100 ppb
Tetrachloroethene (PCE)	groundwater	22,000 ppb
Trichloroethene (TCE)	groundwater	1,700 ppb
trans-1,2-Dichloroethene	groundwater	56 ppb
Vinyl Chloride	groundwater	72 ppb

Site Hydrology

Deepest Significant Groundwater Contamination:
Plume Size:		Plume Length: 150ft Plume Width: 90ft Plume Thickness: 30ft
Average Depth to Groundwater:		10ft

Lithology and Subsurface Geology

		Clayey silt Depth: 0-15ft bgs 15ft thick Conductivity: 5ft/day Gradient: 0.01ft/ft
		Stiff silty clay with interbeds of fine sand Depth: 15-25ft bgs 10ft thick

Pathways and DNAPL Presence

Groundwater

Sediments

Soil

Presumptive Evidence of DNAPL

Remediation Scenario

Cleanup Goals:

Reduce or eliminate the threat from volatilzation from soil and groundwater to indoor air at the site building (Asian food market) and adjacent residential buildings.

Technologies

In Situ Bioremediation

Why the technology was selected:
DEQ and Adventus Americas teamed to pilot the effectiveness of EHC to meet the remediation objectives. Adventus providing its product at a reduced rate, and EPA Grant funding, helped reduce DEQ's costs.

Date implemented:
Injections completed in August 2006

Final remediation design:
Site is being evaluated for current risk, to determine if vapor intrusion may be a current threat, and if additional cleanup is needed.

Other technologies used:
In-Situ Integrated biological and chemical reduction using the Adventus Americas' product EHC injected in 32 locations in a grid over an area of about 800 square feet

Results to date:
Demonstrated that EHC (and other products) can be injected into fine grained soils at the site. One year after the EHC application, total chlorinated VOCs decreased by greater than 99% at the four monitoring well sampling locations. PCE and TCE have reduced to concentrations below the detection limit of 1 ppb at all locations. For more information visit the DEQ project web site at www.deq.state.or.us/Webdocs/Forms/Output/FPController.ashx?SourceId=3113&SourceIdType=11 in 2011 groundwater conditions remained good, with little or no rebound observed in EHC treatment areas

Next Steps:
Limited performance monitoring for groundwater. Additional VI assessment. Evaluate site for closure.

Cost to Design and Implement:
$53,000 Work plan and implementation $10,000 Adventus Americas (EHC and engineering support) $2,000 Final pilot study report

In Situ Zero Valent Iron

Date implemented:
Injections completed in August 2006

Final remediation design:
Site is being evaluated for current risk, to determine if vapor intrusion may be a current threat, and if additional cleanup is needed.

Other technologies used:
In-Situ Integrated biological and chemical reduction using the Adventus Americas' product EHC injected in 32 locations in a grid over an area of about 800 square feet

Next Steps:
Limited performance monitoring for groundwater. Additional VI assessment. Evaluate site for closure.

Cost to Design and Implement:
$53,000 Work plan and implementation $10,000 Adventus Americas (EHC and engineering support) $2,000 Final pilot study report

Costs

Cost for Assessment:		$70,000
Cost for Operation and Maintenance:		$26,000 Monitoring and reporting for 14 months
Total Costs for Cleanup:		159,000 Initial Cost for bio/EHC removal action and monitoring.

Lessons Learned

1. It was determined that Adventus' EHC can be injected into fine grained soils using the Geoprobe Pressure Activated Injectin probe with a high pressure grout pump, and be effectively distributed to treat shallow groundwater at the site.
2. The EHC treatment has been effective in reducing VOC concentrations by 99% in the treatment zone, with little generation of cis-1,2 DCE or vinyl chloride.
3. High pressure injections in relatively shallow fine grained soils can result in surfacing of the injectate. Pavement in the injection area can mask surfacing and can be damaged by mounding.

Contacts

Don Hanson
Oregon Dept. of Environmental Quality
165 E. 7th Avenue, Suite 100
Eugene, OR 97401
(541) 687-7349
hanson.don@deq.state.or.us

Vendor:
Adventus Americas, Inc.
Josephine Molin, Project Engineer
2871 W. Forest Rd, Suite 2
Freeport, IL 61032
tel 815.235.3503
josephine.molin@adventusgroup.com
www.adventusgroup.com

Site Specific References

"Full Scale EHC Pilot Study Injection Report, former Serry's Cleaners", Hart Crowser, November 21, 2006.

"EHC Pilot Study for Oregon DEQ's Dry Cleaner Program at a Former Dry Cleaner Site, OREGON USA", Adventus Americas, Inc.

Both are Available at DEQ's web site: http://www.deq.state.or.us/Webdocs/Forms/Output/FPController.ashx?SourceId=3113&SourceIdType=11

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