Description
Historical activity that resulted
in contamination.
| The facility is part of a strip mall on a 1.5 acre parcel. The drycleaner has been in operation from 1985 to the present. The site is a commercial property with four suites in the strip mall. The drycleaner has only used PCE since its founding.
The source areas are identified as a dumpster area to the rear of the facility, as well as along the sewer line located in the front of the building. The receptors in the area is a Navy property with a standby well 150 yards from the site, as well as a Naval Air Station. 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 |
|
|
Site Hydrology
| Deepest Significant
Groundwater Contamination: |
|
|
| Plume Size: |
|
|
| Average Depth
to Groundwater: |
|
16.5ft |
Lithology and Subsurface Geology
|
|
clayey silts
Depth: 0-15ft bgs
15ft thick
Conductivity: 0.002834646ft/day
Gradient: 0.0036ft/ft
|
|
|
silty clay
Depth: 15-18ft bgs
3ft thick
|
|
|
clayey silts
Depth: 18-42ft bgs
24ft thick
|
|
|
sands
Depth: 42-48ft bgs
6ft thick
|
Pathways and DNAPL Presence
 Groundwater
 Sediments
Soil
Presumptive Evidence of DNAPL
|
Vapor Intrusion Pathway
Has the potential for vapor intrusion (VI) been evaluated? |
|
No
|
Has a vapor mitigation system been installed? |
|
No |
Additional VI Information: |
|
The VI Pathway was not evaluated because the facility is active. |
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:
Excavation and the injection of a slow release substrate (emulsified oil) was conducted first as an interim remediation. Two excavations were conducted to remove the heavily contaminated soil. Two infiltration galleries were installed at the bottom of excavated areas. The emulsified oil was chosen to stimulate the reductive dechlorination occurring at the site.
The full-scale remedial technology selected was recommended by Innovative Environmental Technologies and was a combination of abiotic and biotic technologies to stimulate the reductive dechlorination that was already occurring at the site.
Date implemented:
Fall 2006- excavation and injection of emulsified oil
Spring 2009- Injections of ZVI and Reductive Technologies.
Final remediation design:
Excavation was conducted in two areas; a 20'x30'x15' deep excavation north of the cleaners and a 60'x60'x'3' deep excavation that included a sewer line area from the facility's back door toward a dumpster area in Fall 2006. Injection galleries were installed in the bottom of both of the excavations. An emulsified oil was applied to excavated areas prior to backfilling the excavations. The excavation removed 644 tons of soil. The north infiltration gallery was loaded with 385 gallons of emulsified oil and the south infiltration gallery was loaded with 200 gallons of emulsified oil.
The full-scale groundwater remedy was designed and implemented by Innovative Environmental Technologies and included four treatment areas, as well as both of the infiltration galleries. 34 direct push injections were utilized to treat the subsurface from 14-50 feet bgs. Three source area injections were conducted, as well as the emplacement of an injectable permeable reactive barrier. The remedial event distributed Vitamins B-2 and B-12, 1,300 pounds of Yeast Extract, 10,000 pounds of EHC, 3,000 pounds of HRC, 5,000 pounds of ZVI, 500 pounds of an oxygen scavenger, and 500 pounds of nutrients.
Results to date:
In MW-6 a decrease of PCE by 82.2% has occured from the 1/08 event to the 10/09 event. The increase in cis 1,2 DCE and TCE indicates that reductive dechlorination continues to occur at this monitoring point.
In MW-5 an increase in cis 1,2 DCE from 40.8ppb to 148 ppb since the 2009 injection event indicates that the geochemistry of this monitoring point was also effected by the 09 injection event.
In MW-2 a slight decrease in PCE has occured from 7/08 to 10/09 by approx. 18%. While increases in TCE and cis 1,2 DCE indicate that reductive dechlorination is also occuring at some rate within this monitoring point.
Next Steps:
Four monitoring events are scheduled following the April 2009 injection events.
Cost to Design and Implement:
Excavation-$193,094
Injections-$260,846
|
In Situ Permeable Reactive Barriers (PRB) |
|
Why the technology was selected:
Excavation and the injection of a slow release substrate (emulsified oil) was conducted first as an interim remediation. Two excavations were conducted to remove the heavily contaminated soil. Two infiltration galleries were installed at the bottom of excavated areas. The emulsified oil was chosen to stimulate the reductive dechlorination occurring at the site.
The full-scale remedial technology selected was recommended by Innovative Environmental Technologies and was a combination of abiotic and biotic technologies to stimulate the reductive dechlorination that was already occurring at the site.
Date implemented:
Spring 2009- Injections of ZVI and Reductive Technologies.
Final remediation design:
Excavation was conducted in two areas; a 20'x30'x15' deep excavation north of the cleaners and a 60'x60'x'3' deep excavation that included a sewer line area from the facility's back door toward a dumpster area in Fall 2006. Injection galleries were installed in the bottom of both of the excavations. An emulsified oil was applied to excavated areas prior to backfilling the excavations. The excavation removed 644 tons of soil. The north infiltration gallery was loaded with 385 gallons of emulsified oil and the south infiltration gallery was loaded with 200 gallons of emulsified oil.
The full-scale groundwater remedy was designed and implemented by Innovative Environmental Technologies and included four treatment areas, as well as both of the infiltration galleries. 34 direct push injections were utilized to treat the subsurface from 14-50 feet bgs. Three source area injections were conducted, as well as the emplacement of an injectable permeable reactive barrier. The remedial event distributed Vitamins B-2 and B-12, 1,300 pounds of Yeast Extract, 10,000 pounds of EHC, 3,000 pounds of HRC, 5,000 pounds of ZVI, 500 pounds of an oxygen scavenger, and 500 pounds of nutrients.
Results to date:
In MW-6 a decrease of PCE by 82.2% has occured from the 1/08 event to the 10/09 event. The increase in cis 1,2 DCE and TCE indicates that reductive dechlorination continues to occur at this monitoring point.
In MW-5 an increase in cis 1,2 DCE from 40.8ppb to 148 ppb since the 2009 injection event indicates that the geochemistry of this monitoring point was also effected by the 09 injection event.
In MW-2 a slight decrease in PCE has occured from 7/08 to 10/09 by approx. 18%. While increases in TCE and cis 1,2 DCE indicate that reductive dechlorination is also occuring at some rate within this monitoring point.
Next Steps:
Four monitoring events are scheduled following the April 2009 injection events.
Cost to Design and Implement:
Excavation-$193,094
Injections-$260,846
|
In Situ Zero Valent Iron |
|
Why the technology was selected:
Excavation and the injection of a slow release substrate (emulsified oil) was conducted first as an interim remediation. Two excavations were conducted to remove the heavily contaminated soil. Two infiltration galleries were installed at the bottom of excavated areas. The emulsified oil was chosen to stimulate the reductive dechlorination occurring at the site.
The full-scale remedial technology selected was recommended by Innovative Environmental Technologies and was a combination of abiotic and biotic technologies to stimulate the reductive dechlorination that was already occurring at the site.
Date implemented:
Spring 2009- Injections of ZVI and Reductive Technologies.
Final remediation design:
Excavation was conducted in two areas; a 20'x30'x15' deep excavation north of the cleaners and a 60'x60'x'3' deep excavation that included a sewer line area from the facility's back door toward a dumpster area in Fall 2006. Injection galleries were installed in the bottom of both of the excavations. An emulsified oil was applied to excavated areas prior to backfilling the excavations. The excavation removed 644 tons of soil. The north infiltration gallery was loaded with 385 gallons of emulsified oil and the south infiltration gallery was loaded with 200 gallons of emulsified oil.
The full-scale groundwater remedy was designed and implemented by Innovative Environmental Technologies and included four treatment areas, as well as both of the infiltration galleries. 34 direct push injections were utilized to treat the subsurface from 14-50 feet bgs. Three source area injections were conducted, as well as the emplacement of an injectable permeable reactive barrier. The remedial event distributed Vitamins B-2 and B-12, 1,300 pounds of Yeast Extract, 10,000 pounds of EHC, 3,000 pounds of HRC, 5,000 pounds of ZVI, 500 pounds of an oxygen scavenger, and 500 pounds of nutrients.
Results to date:
In MW-6 a decrease of PCE by 82.2% has occured from the 1/08 event to the 10/09 event. The increase in cis 1,2 DCE and TCE indicates that reductive dechlorination continues to occur at this monitoring point.
In MW-5 an increase in cis 1,2 DCE from 40.8ppb to 148 ppb since the 2009 injection event indicates that the geochemistry of this monitoring point was also effected by the 09 injection event.
In MW-2 a slight decrease in PCE has occured from 7/08 to 10/09 by approx. 18%. While increases in TCE and cis 1,2 DCE indicate that reductive dechlorination is also occuring at some rate within this monitoring point.
Next Steps:
Four monitoring events are scheduled following the April 2009 injection events.
Cost to Design and Implement:
Excavation-$193,094
Injections-$260,846
|
Ex Situ Biostimulation |
|
Why the technology was selected:
Excavation and the injection of a slow release substrate (emulsified oil) was conducted first as an interim remediation. Two excavations were conducted to remove the heavily contaminated soil. Two infiltration galleries were installed at the bottom of excavated areas. The emulsified oil was chosen to stimulate the reductive dechlorination occurring at the site.
The full-scale remedial technology selected was recommended by Innovative Environmental Technologies and was a combination of abiotic and biotic technologies to stimulate the reductive dechlorination that was already occurring at the site.
Date implemented:
Fall 2006- excavation and injection of emulsified oil
Spring 2009- Injections of ZVI and Reductive Technologies.
Final remediation design:
Excavation was conducted in two areas; a 20'x30'x15' deep excavation north of the cleaners and a 60'x60'x'3' deep excavation that included a sewer line area from the facility's back door toward a dumpster area in Fall 2006. Injection galleries were installed in the bottom of both of the excavations. An emulsified oil was applied to excavated areas prior to backfilling the excavations. The excavation removed 644 tons of soil. The north infiltration gallery was loaded with 385 gallons of emulsified oil and the south infiltration gallery was loaded with 200 gallons of emulsified oil.
The full-scale groundwater remedy was designed and implemented by Innovative Environmental Technologies and included four treatment areas, as well as both of the infiltration galleries. 34 direct push injections were utilized to treat the subsurface from 14-50 feet bgs. Three source area injections were conducted, as well as the emplacement of an injectable permeable reactive barrier. The remedial event distributed Vitamins B-2 and B-12, 1,300 pounds of Yeast Extract, 10,000 pounds of EHC, 3,000 pounds of HRC, 5,000 pounds of ZVI, 500 pounds of an oxygen scavenger, and 500 pounds of nutrients.
Results to date:
In MW-6 a decrease of PCE by 82.2% has occured from the 1/08 event to the 10/09 event. The increase in cis 1,2 DCE and TCE indicates that reductive dechlorination continues to occur at this monitoring point.
In MW-5 an increase in cis 1,2 DCE from 40.8ppb to 148 ppb since the 2009 injection event indicates that the geochemistry of this monitoring point was also effected by the 09 injection event.
In MW-2 a slight decrease in PCE has occured from 7/08 to 10/09 by approx. 18%. While increases in TCE and cis 1,2 DCE indicate that reductive dechlorination is also occuring at some rate within this monitoring point.
Next Steps:
Four monitoring events are scheduled following the April 2009 injection events.
Cost to Design and Implement:
Excavation-$193,094
Injections-$260,846
|
Costs
Cost
for Assessment:
|
|
$259,054 |
Cost
for Operation and Maintenance:
|
|
|
Total
Costs for Cleanup:
|
|
$713,034.00 |
Contacts
Nancy Boisvert
Program Manager
TDEC-DoR
Drycleaner Response Program
401 Church St.
Nashville, TN
615-263-3876
Elizabeth Bishop
Innovative Environmental Technologies
6130 Kit Road, Pipersville, PA
www.iet-inc.net
888-721-8283
elizabethbishop@iet-inc.net
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