Description
Historical activity that resulted
in contamination.
| A 2,647 sq. ft. drycleaning facility operated from 1975 to 1997 on the site. The drycleaner was located in a multi-tenant, multi-building strip mall. The source area has been identified in the rear of the building along the east wall of the site building. The drycleaning facility used PCE as its only solvent.
The property is surrounded on three sides by commercial properties and to the north a residential area exists. Remediation Status: In groundwater monitoring |
Contaminants
Contaminants present and the highest amount
detected in both soil and groundwater.
| Contaminant |
Media |
Concentration (ppb) |
Nondetect |
| cis-1,2-Dichloroethene |
groundwater |
|
|
| cis-1,2-Dichloroethene |
soil |
|
|
| Tetrachloroethene (PCE) |
groundwater |
|
|
| Tetrachloroethene (PCE) |
soil |
|
|
| Trichloroethene (TCE) |
groundwater |
|
|
| Trichloroethene (TCE) |
soil |
|
|
| Vinyl Chloride |
groundwater |
|
|
| Vinyl Chloride |
soil |
|
|
Site Hydrology
| Deepest Significant
Groundwater Contamination: |
|
32ft bgs |
| Plume Size: |
|
|
| Average Depth
to Groundwater: |
|
28ft |
Lithology and Subsurface Geology
|
|
silty clay loam
Depth: 0-20ft bgs
20ft thick
Conductivity: 8.96E-005ft/day
Gradient: 0.019ft/ft
|
|
|
silty clay
Depth: 20-23ft bgs
3ft thick
|
|
|
sandy clay loam
Depth: 23-27ft bgs
4ft thick
|
|
|
sandy loam
Depth: 27-36ft bgs
9ft thick
|
Pathways and DNAPL Presence
 Groundwater
 Sediments
Soil
Presumptive Evidence of DNAPL
|
Vapor Intrusion Pathway
Has the potential for vapor intrusion (VI) been evaluated? |
|
Yes
|
How was the site evaluated? |
|
|
Results of VI evaluation: |
|
The VI pathway was ruled out (or does not exist) |
Has a vapor mitigation system been installed? |
|
No |
Additional VI Information: |
|
The VI Pathway was evaluated and no risk was identified. |
Remediation Scenario
Cleanup
Goals: |
|
To achieve drinking water standards, with an interim goal of plume contraction.
|
Remedy Level: |
|
Full Scale Remedy |
Technologies
In Situ Biostimulation |
|
Why the technology was selected:
Biostimulation and zero valent iron (ZVI) was recommended by Innovative Environmental Technologies and selected in 2009 in order to stimulate the reductive dechlorination of PCE. The concentration of PCE's anaerobic reaction products were such that biological reductive dechlorination was occurring, but needed to be stimulated.
Date implemented:
Winter 2007- Biostimulation
Winter 2009- Biostimulation and ZVI
Final remediation design:
As an interim action, an excavation of approximately 63 tons of soil occurred at the site, with the excavated soil disposed of as hazardous waste. The excavated soil source area was identified through investigations to be in the loading dock area/ back door of the former drycleaner. The excavation was 30 ft x 8 ft x 8 ft deep. An infiltration gallery was installed into the excavation pit prior to backfilling.
A second interim action was designed and implemented by the environmental consultant in early Winter 2007. An area 45 ft x 75 ft x 15 ft deep was treated using the existing infiltration gallery plus 15 additional direct push points. The infiltration gallery was loaded with approximately 360 gallons of emulsified oil and the fifteen injection points were loaded with 500 gallons of emulsified oil (approximately 33 gallons per point).
A final remedial design was designed and implemented by Innovative Environmental Technologies in early winter 2009. An area of 12,850 square feet was treated using a solution of approximately 2,750 pounds of ZVI, 600 pounds of calcium propionate, 400 pounds of yeast extract, 200 pounds of an oxygen scavenger, 200 pounds of nutrient, vitamins B2 and B12, 750 pounds of HRC, and 5,400 pounds of EHC using 20 direct push points.
Results to date:
Groundwater sampling at the Bunny Cleaner's site has occurred quarterly across the site with specific monitoring wells sampled each time. The pre- and post-remedial PCE concentrations are displayed below from the early Winter 2009 injection event. The most significant reductions occurred in monitoring well MW-9 which is located in the source area.
PCE
Well March 08(pre) May 09 (post)
MW-3 880ppb 513ppb
MW-6 25ppb 10.6ppb
MW-7 320ppb 370ppb
Monitoring well MW-9
Feb 08 (pre) Sep 09 (post)
PCE 13,000 ppb 35 ppb
TCE 1,400 ppb 8.05 ppb
cis-DCE 3,300 ppb 1,500 ppb
VC 320 ppb 1,740 ppb
Next Steps:
Two more groundwater sampling events are scheduled over the upcoming 120 days.
Cost to Design and Implement:
-emulsified oil injection-$180,291
-Bio/Abiotic injection-$107,514
|
In Situ Zero Valent Iron |
|
Why the technology was selected:
Biostimulation and zero valent iron (ZVI) was recommended by Innovative Environmental Technologies and selected in 2009 in order to stimulate the reductive dechlorination of PCE. The concentration of PCE's anaerobic reaction products were such that biological reductive dechlorination was occurring, but needed to be stimulated.
Date implemented:
Winter 2007- Biostimulation
Winter 2009- Biostimulation and ZVI
Final remediation design:
As an interim action, an excavation of approximately 63 tons of soil occurred at the site, with the excavated soil disposed of as hazardous waste. The excavated soil source area was identified through investigations to be in the loading dock area/ back door of the former drycleaner. The excavation was 30 ft x 8 ft x 8 ft deep. An infiltration gallery was installed into the excavation pit prior to backfilling.
A second interim action was designed and implemented by the environmental consultant in early Winter 2007. An area 45 ft x 75 ft x 15 ft deep was treated using the existing infiltration gallery plus 15 additional direct push points. The infiltration gallery was loaded with approximately 360 gallons of emulsified oil and the fifteen injection points were loaded with 500 gallons of emulsified oil (approximately 33 gallons per point).
A final remedial design was designed and implemented by Innovative Environmental Technologies in early winter 2009. An area of 12,850 square feet was treated using a solution of approximately 2,750 pounds of ZVI, 600 pounds of calcium propionate, 400 pounds of yeast extract, 200 pounds of an oxygen scavenger, 200 pounds of nutrient, vitamins B2 and B12, 750 pounds of HRC, and 5,400 pounds of EHC using 20 direct push points.
Results to date:
Groundwater sampling at the Bunny Cleaner's site has occurred quarterly across the site with specific monitoring wells sampled each time. The pre- and post-remedial PCE concentrations are displayed below from the early Winter 2009 injection event. The most significant reductions occurred in monitoring well MW-9 which is located in the source area.
PCE
Well March 08(pre) May 09 (post)
MW-3 880ppb 513ppb
MW-6 25ppb 10.6ppb
MW-7 320ppb 370ppb
Monitoring well MW-9
Feb 08 (pre) Sep 09 (post)
PCE 13,000 ppb 35 ppb
TCE 1,400 ppb 8.05 ppb
cis-DCE 3,300 ppb 1,500 ppb
VC 320 ppb 1,740 ppb
Next Steps:
Two more groundwater sampling events are scheduled over the upcoming 120 days.
Cost to Design and Implement:
-emulsified oil injection-$180,291
-Bio/Abiotic injection-$107,514
|
Ex Situ Soil Removal |
|
Date implemented:
Winter 2006- Excavation
Final remediation design:
As an interim action, an excavation of approximately 63 tons of soil occurred at the site, with the excavated soil disposed of as hazardous waste. The excavated soil source area was identified through investigations to be in the loading dock area/ back door of the former drycleaner. The excavation was 30 ft x 8 ft x 8 ft deep. An infiltration gallery was installed into the excavation pit prior to backfilling.
A second interim action was designed and implemented by the environmental consultant in early Winter 2007. An area 45 ft x 75 ft x 15 ft deep was treated using the existing infiltration gallery plus 15 additional direct push points. The infiltration gallery was loaded with approximately 360 gallons of emulsified oil and the fifteen injection points were loaded with 500 gallons of emulsified oil (approximately 33 gallons per point).
A final remedial design was designed and implemented by Innovative Environmental Technologies in early winter 2009. An area of 12,850 square feet was treated using a solution of approximately 2,750 pounds of ZVI, 600 pounds of calcium propionate, 400 pounds of yeast extract, 200 pounds of an oxygen scavenger, 200 pounds of nutrient, vitamins B2 and B12, 750 pounds of HRC, and 5,400 pounds of EHC using 20 direct push points.
Results to date:
Groundwater sampling at the Bunny Cleaner's site has occurred quarterly across the site with specific monitoring wells sampled each time. The pre- and post-remedial PCE concentrations are displayed below from the early Winter 2009 injection event. The most significant reductions occurred in monitoring well MW-9 which is located in the source area.
PCE
Well March 08(pre) May 09 (post)
MW-3 880ppb 513ppb
MW-6 25ppb 10.6ppb
MW-7 320ppb 370ppb
Monitoring well MW-9
Feb 08 (pre) Sep 09 (post)
PCE 13,000 ppb 35 ppb
TCE 1,400 ppb 8.05 ppb
cis-DCE 3,300 ppb 1,500 ppb
VC 320 ppb 1,740 ppb
Next Steps:
Two more groundwater sampling events are scheduled over the upcoming 120 days.
|
Costs
Cost
for Assessment:
|
|
$158,162 |
Cost
for Operation and Maintenance:
|
|
|
Total
Costs for Cleanup:
|
|
$445,967.00 |
Contacts
Program Manager
TDEC-DoR
Drycleaner Environmental Response Program
401 Church St.
Nashville, TN
Elizabeth Bishop
Innovative Environmental Technologies
6130 Kit Road, Pipersville, PA
www.iet-inc.net
888-721-8283
elizabethbishop@iet-inc.net
615-263-3876
|
|
