State Coalition for Remediation of Drycleaners Site Profiles
Carousel Cleaners, Oregon City, Oregon
Description
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Carousel Cleaners is an active retail dry cleaner located in Oregon City, Clackamas County, Oregon (NW ΒΌ, Section 38, Township 2S, Range 2E). The site topography and surface gradient are relatively flat. Several residences and commercial businesses are located within the immediate vicinity of the site. The site is bounded by an apartment complex to the east, a vacant lot to the north, and a small business park to the south.
In July 1999, soil and groundwater samples were collected at the site as part of a preliminary site investigation. PCE was detected in soil boring samples from 35 to 1,010,000 micrograms per kilogram (ug/kg). The location with 1,010,000 ug/kg of PCE is adjacent to the back door to the dry cleaning facility.
PCE was also detected, at 0.7 ug/L, in a groundwater sample collected from the facility industrial supply well completed in the deep basalt aquifer. The supply well is on the south side of the property approximately 100 feet downgradient of the primary source area. Remediation Status: In active remediation |
Contaminants
Contaminants present and the highest amount
detected in both soil and groundwater.
Contaminant | Media | Concentration (ppb) | Nondetect |
---|---|---|---|
Tetrachloroethene (PCE) | groundwater | 25,700 ppb | |
Tetrachloroethene (PCE) | soil | 7,000,000 ppb |
Site Hydrology
Deepest Significant Groundwater Contamination: | 150ft bgs | |
Plume Size: | Plume Length: 100ft Plume Width: 50ft |
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Average Depth to Groundwater: | 15ft |
Lithology and Subsurface Geology
silt Depth: 0-30ft bgs 30ft thick Gradient: 0.002ft/ft |
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fractured basalt Depth: 30ft bgs |
Pathways and DNAPL Presence
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Remediation Scenario
Cleanup
Goals: |
Final cleanup goals yet to be established. Likely cleanup goals for groundwater and soil will be based on vapor intrusion modeling, and protection of deep aquifer at the MCL of 5ppb for PCE. |
Technologies
In Situ Bioremediation |
Why the technology was selected: Date implemented: Final remediation design: Results to date: Cost to Design and Implement: |
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In Situ Soil Vapor Extraction |
Why the technology was selected: Date implemented: Final remediation design: Next Steps: Cost to Design and Implement: |
Costs
Cost
for Assessment: |
$101,000 | |
Cost
for Operation and Maintenance: |
$55,000 | |
Total
Costs for Cleanup: |
Lessons Learned
1. Site investigations need to be more comprehensive. Significant source material in vadose zone should have been addressed initially through alternative means than biological amendment flushing (e.g. SVE or removal) |
Contacts
MArk Pugh, Project Manager DEQ Northwest Region 2020 SW 4th Avenue, Suite 400 Portland, OR 97201 E-mail: Pugh.Mark@deq.state.or.us Phone: (503)229-6662 Fax: (503)229-6945 |