Drycleaner Site Profiles

Hayden Island Cleaners, Portland, Oregon

Description
Historical activity that resulted in contamination.

This is an active perchloroethylene (PCE) drycleaning facility that has been in operation since 1975. It is located in a commercial setting adjacent to the Columbia River.

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


Contaminant Media Concentration (ppb) Nondetect
cis-1,2-Dichloroethene groundwater 3,400 ppb
Tetrachloroethene (PCE) groundwater 1,230,000 ppb
Trichloroethene (TCE) groundwater 1,000 ppb

Site Hydrology

Deepest Significant Groundwater Contamination:  
Plume Size:  
Average Depth to Groundwater:   7ft

Lithology and Subsurface Geology

Upper surficial aquifer
  silty sand
Depth: 20-40ft bgs
20ft thick
Gradient: 0.001ft/ft

Pathways and DNAPL Presence

checkGroundwater
Sediments
Soil
DNAPL Present

Remediation Scenario

Cleanup Goals:
  Site cleaned up using Oregon's Risk Based Concentrations (RBCs) as outlined at:
www.deq.state.or.us/wmc/tank/rbdm.htm

Technologies

In Situ Bioremediation
 

Date implemented:
5/17/1999

Final remediation design:
Treatment area was 200 ft2 (two "treatment" walls) in the upper surficial aquifer. A total of 2,310 pounds of HRC™ were injected, using direct push technology, at 42 locations, spaced on 10-ft centers (two 2-x-80-ft grid walls) at depths of 25-40 ft. bgs. 3.2 lbs/ft of HRC™ were used at each injection point.

Results to date:
After 1 yr and 3 mos, an 87% mass reduction in PCE was achieved. Substantial increases of daughter products TCE, cis-1,2-DCE were observed.

Next Steps:
This site received a No Further Action (NFA) determination by the state in December 2001.

Cost to Design and Implement:
HRC™ product -- $ 14,000 ($6.00/lb)HRC™ Install -- $45,000HRC™ Groundwater Monitoring -- $20,000

Costs

Cost for Assessment:
  $70,000
Cost for Operation and Maintenance:
  $53,000
Total Costs for Cleanup:
  $202,000

Lessons Learned

1. Location of site next to river complicated the hydrogeology of the site. River stage and tidal fluctuations accounted for flow reversals at the site. In addition, the timeframe of the injection occurred during the slowest groundwater transport period which required several months for HRC™ enhanced remediation to be noticed.

2. HRC was injected along two transects to account for groundwater flow reversals. The injections were designed to provide an engineered "treatment wall" or zone prior to off-property and surface water discharge migration.

3. A steam-cleaner is very helpful with clean-up of HRC product. Cleanup should commence the same day as injection activities. Waiting until the following day or at the end of injection event necessitated additional labor/time.

4. Analysis of acid in water sooner would have helped facilitated the amount of HRC remaining in the subsurface.

5. Regenesis offers onsite assistance and instruction during injection activities. Their guidance was very useful during the initiation of the project.

Contacts

David Anderson
Oregon DEQ
811 SW 6th
Portland, OR 97204
(503) 229-5428
anderson.david@deq.state.or.us