Description
Historical activity that resulted
in contamination.
| Cool City Cleaners operated from 1939 to 1982 and is located on a small, steeply sloped property of approximately ½ acre in small town urban setting. Stoddard solvent was used the entire time the dry cleaner operated. In the mid 1950s, PCE solvent was added as another cleaning option until the facility closed in 1982. Both solvents were stored in ASTs or drums. When the dry cleaner closed, the building was renovated for commercial and residential use. The lower level facing the water is a residence and the upper level, facing a busy commercial corridor, is a real estate office. The site is located at the tip of small peninsula at the confluence of two rivers. Remediation Status: Site closed |
Contaminants
Contaminants present and the highest amount
detected in both soil and groundwater.
| Contaminant |
Media |
Concentration (ppb) |
Nondetect |
| naphthalene |
groundwater |
133 ppb |
|
| Benzene |
groundwater |
160 ppb |
|
| cis-1,2-Dichloroethene |
groundwater |
8,950 ppb |
|
| Tetrachloroethene (PCE) |
soil |
8,000 ppb |
|
| Trichloroethene (TCE) |
groundwater |
434 ppb |
|
| 1,2,4-trimethylbenzene |
soil |
580,000 ppb |
|
| 1,3,5-trimethylbenzene |
soil |
151,000 ppb |
|
| Vinyl Chloride |
groundwater |
384 ppb |
|
Site Hydrology
| Deepest Significant
Groundwater Contamination: |
|
20ft bgs |
| Plume Size: |
|
|
| Average Depth
to Groundwater: |
|
10.5ft |
Lithology and Subsurface Geology
|
|
layers of clay, sand, and silt
Conductivity: 1.7ft/day
|
|
|
thick clay layer
|
Pathways and DNAPL Presence
 Groundwater
 Sediments
Soil
DNAPL Present
|
Vapor Intrusion Pathway
Has the potential for vapor intrusion (VI) been evaluated? |
|
Yes
|
How was the site evaluated? |
|
Soil vapor and/or Sub-slab vapor sampling,Indoor air sampling,Compared sample concentration to screening criteria
|
Results of VI evaluation: |
|
A completed VI pathway has been indentified |
Has a vapor mitigation system been installed? |
|
Yes |
Type of Vapor Mitigation System(s): |
|
Passive Vapor Barrier
Sub-slab Depressurization
Sub-slab Pressurization
Passive Venting
HVAC controls/modifications
Soil Vapor Extraction
|
Additional VI Information: |
|
The vapor intrusion risk to the residence was evaluated via 24-hour time integrated air sampling with SUMMA canisters. Although indoor air levels did not exceed US EPA air screening values, there were elevated solvents detected in sub-slab vapor samples. Therefore a sub slab depressurization system (radon type mitigation system) was installed in the building. Several years of indoor air monitoring after the system was installed showed a steady decrease in indoor air solvent concentrations. |
Remediation Scenario
Cleanup
Goals: |
|
To protect human health and the environment while allow succesful reuse of the building. To achieve closure and compliance with Wisconsin Administrative Code Ssandards.
The site was first reported to the Wisconsin Department of Natural Resources in 1999 when trimethylbenzenes (TMB) and other volatile organic compounds (VOC) were noted in soil at depths of 8 to 10 feet. Site investigation activities were performed between December 2001 and September 2003 and found varying degrees of PCE and its breakdown products, Stoddard solvent, and other contamination in shallow groundwater. No free phase product was encountered.
Petroleum contamination was discovered upgradient and downgradient of the dry cleaner during site investigation activities. MTBE and BTEX contaminants in groundwater at the site were attributed to an off-site source and have co-mingled with the dry cleaning solvents.
|
Remedy Level: |
|
Full Scale Remedy |
Technologies
in Situ Bioremediation |
|
Why the technology was selected:
to enhance reductive chlorination at source area
Date implemented:
September 2007
Final remediation design:
Monitoring for natural attenuation was conducted at the site quarterly and semi-annually for 3 years when a steady increase of 1,2 DCE and TCE was noted in a downgradient well adjacent to the building. The remedial action plan was amended and a carbon enhanced remedy was added. In August 2007, 220 gallons of 60% solution of emulsified edible oil (EOS) substrate were injected into 12 injection wells located within the building and outside of the building spaced about 10 feet apart.
Other technologies used:
Edible Oil Substate injection
Results to date:
Subsequent to the injection, five more quarters of groundwater monitoring and gas monitoring were conducted until September 2008. Prior to the injection, TOC concentrations were less that 20 mg/L, ORP readings were generally less than -40 mV, and DO was less than 1 mg/L. It was assumed that reduced conditions were already present due to the off-site PVOC plume passing through the site. At the most impacted monitoring well PCE, TCE, and cis 1,2 DCE dropped significantly after the carbon injection. As expected, ethene and VC increased. The EOS injection increased the TOC to over 100 mg/L but within 1 year, levels dropped back to 20 mg/L. PCE, TCE and cis 1,2 DCE levels also returned to their pre injection levels within one year indicating that all of the EOS had likely been consumed. Monitoring wells nearest the river exhibited low to very low levels of contaminants indicating reductive chlorination was occurring and continues to occur within the site prior to the groundwater discharging into the surface water.
Next Steps:
Pre- and Post- Results of the most impacted monitoring well (MW-2)
Contaminant Pre-injection (ug/L) Post injection (one year later) ug/L
PCE 93.3 38.7
TCE 4,639 434
12 cis DCE 8,900 2,950
12 trans DCE 298 82.4
VC 68 384
Closure was requested for the site in November 2009 and it was granted closure under NR 726 Wisconsin Administrative Code in April 2010. The site is listed in Wisconsin's Registry of Closed Remediation Sites with residual soil and groundwater contamination. Cap maintenance and continued vapor mitigation system operation and maintenance are part of the permitted closure of the site.
Cost to Design and Implement:
EOS injection: $63,421
|
in Situ Cap |
|
Why the technology was selected:
to enhance reductive chlorination at source area
Date implemented:
September 2007
Final remediation design:
Monitoring for natural attenuation was conducted at the site quarterly and semi-annually for 3 years when a steady increase of 1,2 DCE and TCE was noted in a downgradient well adjacent to the building. The remedial action plan was amended and a carbon enhanced remedy was added. In August 2007, 220 gallons of 60% solution of emulsified edible oil (EOS) substrate were injected into 12 injection wells located within the building and outside of the building spaced about 10 feet apart.
Results to date:
Subsequent to the injection, five more quarters of groundwater monitoring and gas monitoring were conducted until September 2008. Prior to the injection, TOC concentrations were less that 20 mg/L, ORP readings were generally less than -40 mV, and DO was less than 1 mg/L. It was assumed that reduced conditions were already present due to the off-site PVOC plume passing through the site. At the most impacted monitoring well PCE, TCE, and cis 1,2 DCE dropped significantly after the carbon injection. As expected, ethene and VC increased. The EOS injection increased the TOC to over 100 mg/L but within 1 year, levels dropped back to 20 mg/L. PCE, TCE and cis 1,2 DCE levels also returned to their pre injection levels within one year indicating that all of the EOS had likely been consumed. Monitoring wells nearest the river exhibited low to very low levels of contaminants indicating reductive chlorination was occurring and continues to occur within the site prior to the groundwater discharging into the surface water.
Next Steps:
Pre- and Post- Results of the most impacted monitoring well (MW-2)
Contaminant Pre-injection (ug/L) Post injection (one year later) ug/L
PCE 93.3 38.7
TCE 4,639 434
12 cis DCE 8,900 2,950
12 trans DCE 298 82.4
VC 68 384
Closure was requested for the site in November 2009 and it was granted closure under NR 726 Wisconsin Administrative Code in April 2010. The site is listed in Wisconsin's Registry of Closed Remediation Sites with residual soil and groundwater contamination. Cap maintenance and continued vapor mitigation system operation and maintenance are part of the permitted closure of the site.
Cost to Design and Implement:
EOS injection: $63,421
|
in Situ Monitored Natural Attenuation |
|
Why the technology was selected:
to enhance reductive chlorination at source area
Date implemented:
September 2007
Final remediation design:
Monitoring for natural attenuation was conducted at the site quarterly and semi-annually for 3 years when a steady increase of 1,2 DCE and TCE was noted in a downgradient well adjacent to the building. The remedial action plan was amended and a carbon enhanced remedy was added. In August 2007, 220 gallons of 60% solution of emulsified edible oil (EOS) substrate were injected into 12 injection wells located within the building and outside of the building spaced about 10 feet apart.
Results to date:
Subsequent to the injection, five more quarters of groundwater monitoring and gas monitoring were conducted until September 2008. Prior to the injection, TOC concentrations were less that 20 mg/L, ORP readings were generally less than -40 mV, and DO was less than 1 mg/L. It was assumed that reduced conditions were already present due to the off-site PVOC plume passing through the site. At the most impacted monitoring well PCE, TCE, and cis 1,2 DCE dropped significantly after the carbon injection. As expected, ethene and VC increased. The EOS injection increased the TOC to over 100 mg/L but within 1 year, levels dropped back to 20 mg/L. PCE, TCE and cis 1,2 DCE levels also returned to their pre injection levels within one year indicating that all of the EOS had likely been consumed. Monitoring wells nearest the river exhibited low to very low levels of contaminants indicating reductive chlorination was occurring and continues to occur within the site prior to the groundwater discharging into the surface water.
Next Steps:
Pre- and Post- Results of the most impacted monitoring well (MW-2)
Contaminant Pre-injection (ug/L) Post injection (one year later) ug/L
PCE 93.3 38.7
TCE 4,639 434
12 cis DCE 8,900 2,950
12 trans DCE 298 82.4
VC 68 384
Closure was requested for the site in November 2009 and it was granted closure under NR 726 Wisconsin Administrative Code in April 2010. The site is listed in Wisconsin's Registry of Closed Remediation Sites with residual soil and groundwater contamination. Cap maintenance and continued vapor mitigation system operation and maintenance are part of the permitted closure of the site.
Cost to Design and Implement:
EOS injection: $63,421
|
in Situ Other |
|
Why the technology was selected:
to enhance reductive chlorination at source area
Date implemented:
September 2007
Final remediation design:
Monitoring for natural attenuation was conducted at the site quarterly and semi-annually for 3 years when a steady increase of 1,2 DCE and TCE was noted in a downgradient well adjacent to the building. The remedial action plan was amended and a carbon enhanced remedy was added. In August 2007, 220 gallons of 60% solution of emulsified edible oil (EOS) substrate were injected into 12 injection wells located within the building and outside of the building spaced about 10 feet apart.
Results to date:
Subsequent to the injection, five more quarters of groundwater monitoring and gas monitoring were conducted until September 2008. Prior to the injection, TOC concentrations were less that 20 mg/L, ORP readings were generally less than -40 mV, and DO was less than 1 mg/L. It was assumed that reduced conditions were already present due to the off-site PVOC plume passing through the site. At the most impacted monitoring well PCE, TCE, and cis 1,2 DCE dropped significantly after the carbon injection. As expected, ethene and VC increased. The EOS injection increased the TOC to over 100 mg/L but within 1 year, levels dropped back to 20 mg/L. PCE, TCE and cis 1,2 DCE levels also returned to their pre injection levels within one year indicating that all of the EOS had likely been consumed. Monitoring wells nearest the river exhibited low to very low levels of contaminants indicating reductive chlorination was occurring and continues to occur within the site prior to the groundwater discharging into the surface water.
Next Steps:
Pre- and Post- Results of the most impacted monitoring well (MW-2)
Contaminant Pre-injection (ug/L) Post injection (one year later) ug/L
PCE 93.3 38.7
TCE 4,639 434
12 cis DCE 8,900 2,950
12 trans DCE 298 82.4
VC 68 384
Closure was requested for the site in November 2009 and it was granted closure under NR 726 Wisconsin Administrative Code in April 2010. The site is listed in Wisconsin's Registry of Closed Remediation Sites with residual soil and groundwater contamination. Cap maintenance and continued vapor mitigation system operation and maintenance are part of the permitted closure of the site.
Cost to Design and Implement:
EOS injection: $63,421
|
in Situ Bioremediation |
|
Why the technology was selected:
to enhance reductive chlorination at source area
Date implemented:
September 2007
Final remediation design:
Monitoring for natural attenuation was conducted at the site quarterly and semi-annually for 3 years when a steady increase of 1,2 DCE and TCE was noted in a downgradient well adjacent to the building. The remedial action plan was amended and a carbon enhanced remedy was added. In August 2007, 220 gallons of 60% solution of emulsified edible oil (EOS) substrate were injected into 12 injection wells located within the building and outside of the building spaced about 10 feet apart.
Results to date:
Subsequent to the injection, five more quarters of groundwater monitoring and gas monitoring were conducted until September 2008. Prior to the injection, TOC concentrations were less that 20 mg/L, ORP readings were generally less than -40 mV, and DO was less than 1 mg/L. It was assumed that reduced conditions were already present due to the off-site PVOC plume passing through the site. At the most impacted monitoring well PCE, TCE, and cis 1,2 DCE dropped significantly after the carbon injection. As expected, ethene and VC increased. The EOS injection increased the TOC to over 100 mg/L but within 1 year, levels dropped back to 20 mg/L. PCE, TCE and cis 1,2 DCE levels also returned to their pre injection levels within one year indicating that all of the EOS had likely been consumed. Monitoring wells nearest the river exhibited low to very low levels of contaminants indicating reductive chlorination was occurring and continues to occur within the site prior to the groundwater discharging into the surface water.
Next Steps:
Pre- and Post- Results of the most impacted monitoring well (MW-2)
Contaminant Pre-injection (ug/L) Post injection (one year later) ug/L
PCE 93.3 38.7
TCE 4,639 434
12 cis DCE 8,900 2,950
12 trans DCE 298 82.4
VC 68 384
Closure was requested for the site in November 2009 and it was granted closure under NR 726 Wisconsin Administrative Code in April 2010. The site is listed in Wisconsin's Registry of Closed Remediation Sites with residual soil and groundwater contamination. Cap maintenance and continued vapor mitigation system operation and maintenance are part of the permitted closure of the site.
Cost to Design and Implement:
EOS injection: $63,421
|
in Situ Bioremediation |
|
Why the technology was selected:
to enhance reductive chlorination at source area
Date implemented:
September 2007
Final remediation design:
Monitoring for natural attenuation was conducted at the site quarterly and semi-annually for 3 years when a steady increase of 1,2 DCE and TCE was noted in a downgradient well adjacent to the building. The remedial action plan was amended and a carbon enhanced remedy was added. In August 2007, 220 gallons of 60% solution of emulsified edible oil (EOS) substrate were injected into 12 injection wells located within the building and outside of the building spaced about 10 feet apart.
Results to date:
Subsequent to the injection, five more quarters of groundwater monitoring and gas monitoring were conducted until September 2008. Prior to the injection, TOC concentrations were less that 20 mg/L, ORP readings were generally less than -40 mV, and DO was less than 1 mg/L. It was assumed that reduced conditions were already present due to the off-site PVOC plume passing through the site. At the most impacted monitoring well PCE, TCE, and cis 1,2 DCE dropped significantly after the carbon injection. As expected, ethene and VC increased. The EOS injection increased the TOC to over 100 mg/L but within 1 year, levels dropped back to 20 mg/L. PCE, TCE and cis 1,2 DCE levels also returned to their pre injection levels within one year indicating that all of the EOS had likely been consumed. Monitoring wells nearest the river exhibited low to very low levels of contaminants indicating reductive chlorination was occurring and continues to occur within the site prior to the groundwater discharging into the surface water.
Next Steps:
Pre- and Post- Results of the most impacted monitoring well (MW-2)
Contaminant Pre-injection (ug/L) Post injection (one year later) ug/L
PCE 93.3 38.7
TCE 4,639 434
12 cis DCE 8,900 2,950
12 trans DCE 298 82.4
VC 68 384
Closure was requested for the site in November 2009 and it was granted closure under NR 726 Wisconsin Administrative Code in April 2010. The site is listed in Wisconsin's Registry of Closed Remediation Sites with residual soil and groundwater contamination. Cap maintenance and continued vapor mitigation system operation and maintenance are part of the permitted closure of the site.
Cost to Design and Implement:
EOS injection: $63,421
|
in Situ Bioremediation |
|
Why the technology was selected:
to enhance reductive chlorination at source area
Date implemented:
September 2007
Final remediation design:
Monitoring for natural attenuation was conducted at the site quarterly and semi-annually for 3 years when a steady increase of 1,2 DCE and TCE was noted in a downgradient well adjacent to the building. The remedial action plan was amended and a carbon enhanced remedy was added. In August 2007, 220 gallons of 60% solution of emulsified edible oil (EOS) substrate were injected into 12 injection wells located within the building and outside of the building spaced about 10 feet apart.
Results to date:
Subsequent to the injection, five more quarters of groundwater monitoring and gas monitoring were conducted until September 2008. Prior to the injection, TOC concentrations were less that 20 mg/L, ORP readings were generally less than -40 mV, and DO was less than 1 mg/L. It was assumed that reduced conditions were already present due to the off-site PVOC plume passing through the site. At the most impacted monitoring well PCE, TCE, and cis 1,2 DCE dropped significantly after the carbon injection. As expected, ethene and VC increased. The EOS injection increased the TOC to over 100 mg/L but within 1 year, levels dropped back to 20 mg/L. PCE, TCE and cis 1,2 DCE levels also returned to their pre injection levels within one year indicating that all of the EOS had likely been consumed. Monitoring wells nearest the river exhibited low to very low levels of contaminants indicating reductive chlorination was occurring and continues to occur within the site prior to the groundwater discharging into the surface water.
Next Steps:
Pre- and Post- Results of the most impacted monitoring well (MW-2)
Contaminant Pre-injection (ug/L) Post injection (one year later) ug/L
PCE 93.3 38.7
TCE 4,639 434
12 cis DCE 8,900 2,950
12 trans DCE 298 82.4
VC 68 384
Closure was requested for the site in November 2009 and it was granted closure under NR 726 Wisconsin Administrative Code in April 2010. The site is listed in Wisconsin's Registry of Closed Remediation Sites with residual soil and groundwater contamination. Cap maintenance and continued vapor mitigation system operation and maintenance are part of the permitted closure of the site.
Cost to Design and Implement:
EOS injection: $63,421
|
in Situ Bioremediation |
|
Why the technology was selected:
to enhance reductive chlorination at source area
Date implemented:
September 2007
Final remediation design:
Monitoring for natural attenuation was conducted at the site quarterly and semi-annually for 3 years when a steady increase of 1,2 DCE and TCE was noted in a downgradient well adjacent to the building. The remedial action plan was amended and a carbon enhanced remedy was added. In August 2007, 220 gallons of 60% solution of emulsified edible oil (EOS) substrate were injected into 12 injection wells located within the building and outside of the building spaced about 10 feet apart.
Results to date:
Subsequent to the injection, five more quarters of groundwater monitoring and gas monitoring were conducted until September 2008. Prior to the injection, TOC concentrations were less that 20 mg/L, ORP readings were generally less than -40 mV, and DO was less than 1 mg/L. It was assumed that reduced conditions were already present due to the off-site PVOC plume passing through the site. At the most impacted monitoring well PCE, TCE, and cis 1,2 DCE dropped significantly after the carbon injection. As expected, ethene and VC increased. The EOS injection increased the TOC to over 100 mg/L but within 1 year, levels dropped back to 20 mg/L. PCE, TCE and cis 1,2 DCE levels also returned to their pre injection levels within one year indicating that all of the EOS had likely been consumed. Monitoring wells nearest the river exhibited low to very low levels of contaminants indicating reductive chlorination was occurring and continues to occur within the site prior to the groundwater discharging into the surface water.
Next Steps:
Pre- and Post- Results of the most impacted monitoring well (MW-2)
Contaminant Pre-injection (ug/L) Post injection (one year later) ug/L
PCE 93.3 38.7
TCE 4,639 434
12 cis DCE 8,900 2,950
12 trans DCE 298 82.4
VC 68 384
Closure was requested for the site in November 2009 and it was granted closure under NR 726 Wisconsin Administrative Code in April 2010. The site is listed in Wisconsin's Registry of Closed Remediation Sites with residual soil and groundwater contamination. Cap maintenance and continued vapor mitigation system operation and maintenance are part of the permitted closure of the site.
Cost to Design and Implement:
EOS injection: $63,421
|
in Situ Bioremediation |
|
Why the technology was selected:
to enhance reductive chlorination at source area
Date implemented:
September 2007
Final remediation design:
Monitoring for natural attenuation was conducted at the site quarterly and semi-annually for 3 years when a steady increase of 1,2 DCE and TCE was noted in a downgradient well adjacent to the building. The remedial action plan was amended and a carbon enhanced remedy was added. In August 2007, 220 gallons of 60% solution of emulsified edible oil (EOS) substrate were injected into 12 injection wells located within the building and outside of the building spaced about 10 feet apart.
Results to date:
Subsequent to the injection, five more quarters of groundwater monitoring and gas monitoring were conducted until September 2008. Prior to the injection, TOC concentrations were less that 20 mg/L, ORP readings were generally less than -40 mV, and DO was less than 1 mg/L. It was assumed that reduced conditions were already present due to the off-site PVOC plume passing through the site. At the most impacted monitoring well PCE, TCE, and cis 1,2 DCE dropped significantly after the carbon injection. As expected, ethene and VC increased. The EOS injection increased the TOC to over 100 mg/L but within 1 year, levels dropped back to 20 mg/L. PCE, TCE and cis 1,2 DCE levels also returned to their pre injection levels within one year indicating that all of the EOS had likely been consumed. Monitoring wells nearest the river exhibited low to very low levels of contaminants indicating reductive chlorination was occurring and continues to occur within the site prior to the groundwater discharging into the surface water.
Next Steps:
Pre- and Post- Results of the most impacted monitoring well (MW-2)
Contaminant Pre-injection (ug/L) Post injection (one year later) ug/L
PCE 93.3 38.7
TCE 4,639 434
12 cis DCE 8,900 2,950
12 trans DCE 298 82.4
VC 68 384
Closure was requested for the site in November 2009 and it was granted closure under NR 726 Wisconsin Administrative Code in April 2010. The site is listed in Wisconsin's Registry of Closed Remediation Sites with residual soil and groundwater contamination. Cap maintenance and continued vapor mitigation system operation and maintenance are part of the permitted closure of the site.
Cost to Design and Implement:
EOS injection: $63,421
|
in Situ Bioremediation |
|
Why the technology was selected:
to enhance reductive chlorination at source area
Date implemented:
September 2007
Final remediation design:
Monitoring for natural attenuation was conducted at the site quarterly and semi-annually for 3 years when a steady increase of 1,2 DCE and TCE was noted in a downgradient well adjacent to the building. The remedial action plan was amended and a carbon enhanced remedy was added. In August 2007, 220 gallons of 60% solution of emulsified edible oil (EOS) substrate were injected into 12 injection wells located within the building and outside of the building spaced about 10 feet apart.
Results to date:
Subsequent to the injection, five more quarters of groundwater monitoring and gas monitoring were conducted until September 2008. Prior to the injection, TOC concentrations were less that 20 mg/L, ORP readings were generally less than -40 mV, and DO was less than 1 mg/L. It was assumed that reduced conditions were already present due to the off-site PVOC plume passing through the site. At the most impacted monitoring well PCE, TCE, and cis 1,2 DCE dropped significantly after the carbon injection. As expected, ethene and VC increased. The EOS injection increased the TOC to over 100 mg/L but within 1 year, levels dropped back to 20 mg/L. PCE, TCE and cis 1,2 DCE levels also returned to their pre injection levels within one year indicating that all of the EOS had likely been consumed. Monitoring wells nearest the river exhibited low to very low levels of contaminants indicating reductive chlorination was occurring and continues to occur within the site prior to the groundwater discharging into the surface water.
Next Steps:
Pre- and Post- Results of the most impacted monitoring well (MW-2)
Contaminant Pre-injection (ug/L) Post injection (one year later) ug/L
PCE 93.3 38.7
TCE 4,639 434
12 cis DCE 8,900 2,950
12 trans DCE 298 82.4
VC 68 384
Closure was requested for the site in November 2009 and it was granted closure under NR 726 Wisconsin Administrative Code in April 2010. The site is listed in Wisconsin's Registry of Closed Remediation Sites with residual soil and groundwater contamination. Cap maintenance and continued vapor mitigation system operation and maintenance are part of the permitted closure of the site.
Cost to Design and Implement:
EOS injection: $63,421
|
in Situ Monitored Natural Attenuation |
|
Final remediation design:
Monitoring for natural attenuation was conducted at the site quarterly and semi-annually for 3 years when a steady increase of 1,2 DCE and TCE was noted in a downgradient well adjacent to the building. The remedial action plan was amended and a carbon enhanced remedy was added. In August 2007, 220 gallons of 60% solution of emulsified edible oil (EOS) substrate were injected into 12 injection wells located within the building and outside of the building spaced about 10 feet apart.
|
in Situ Cap |
|
Next Steps:
Pre- and Post- Results of the most impacted monitoring well (MW-2)
Contaminant Pre-injection (ug/L) Post injection (one year later) ug/L
PCE 93.3 38.7
TCE 4,639 434
12 cis DCE 8,900 2,950
12 trans DCE 298 82.4
VC 68 384
Closure was requested for the site in November 2009 and it was granted closure under NR 726 Wisconsin Administrative Code in April 2010. The site is listed in Wisconsin's Registry of Closed Remediation Sites with residual soil and groundwater contamination. Cap maintenance and continued vapor mitigation system operation and maintenance are part of the permitted closure of the site.
|
in Situ Other |
|
Next Steps:
Pre- and Post- Results of the most impacted monitoring well (MW-2)
Contaminant Pre-injection (ug/L) Post injection (one year later) ug/L
PCE 93.3 38.7
TCE 4,639 434
12 cis DCE 8,900 2,950
12 trans DCE 298 82.4
VC 68 384
Closure was requested for the site in November 2009 and it was granted closure under NR 726 Wisconsin Administrative Code in April 2010. The site is listed in Wisconsin's Registry of Closed Remediation Sites with residual soil and groundwater contamination. Cap maintenance and continued vapor mitigation system operation and maintenance are part of the permitted closure of the site.
|
Costs
Cost
for Assessment:
|
|
$60,150 |
Cost
for Operation and Maintenance:
|
|
GW & vapor monitoring, project management, Closure documentation:
$49,610 |
Total
Costs for Cleanup:
|
|
$173,188 |
Lessons Learned
MNA monitoring should be conducted for at least three years to see if conditions change.
Health Dept would likely recommend a subslab depressurization system if subslab is impacted but indoor air is not.
|
Contacts
Annette Weissbach
WDNR-Remediation & Redevelopment Program
2984 Shawano Avenue, Green Bay WI 54313-6727
phone: (920) 662-5165
annette.weissbach@wisconsin.gov
|
Site Specific References
|
