Remediation Status: In active remediation

Date implemented:
Six injections of Potassium lactate and denatured ethanol from January through July 2008.

Results to date:
Approximately 244 tons (174 cubic yards) of contaminated soil and concrete debris were removed from within and under the northeastern portion of the facility and the area immediately north of the northeastern portion of the building and disposed offsite. Contaminated soil was excavated to a depth of 4 feet. Prior to excavation, 24 helical piers were installed along two exterior walls and along one load-bearing interior wall to support the building foundation. Upon completion of the ecavation, four 4-inch diameter 10 foot long horizontal vapor extraction wells were installed two feet in the interior excavation. An additional 7 horizontal vapor extraction wells were installed two feet below the building floor slab in the area west and south of the excavation. Six injection wells were installed in the excavated area for future use. These wells were installed to a depth of 35 feet with 2.5 feet of 0.01-inch slot screens. Two clusters of three- monitor wells, screened 3-13, 19-24 and 30-35 feet were installed in the excvated area. Soil Vapor Extraction System startup February 2007. Six injections of Potassium lactate and denatured ethanol from January through July 2008. Jaunuary - August 2008 conducted monthly, quarterly and semi-annual monitoring. The soil vapor extraction system is currently operating at the site.

Next Steps:
Continued injections to address source area. Continued operation of SVE.

Why the technology was selected:
Chemical oxidation was selected because of the high contaminant concentrations (indicative of the presence of DNAPL)in groundwater at the site.

Date implemented:
Chemical Oxidation Injections: July 19-23, 1999; August 23-27, 1999, May 24,2000

Final remediation design:
Six injection wells were installed for the chemical oxidation (Fenton's reagent)remedy. These wells were constructed of 4-inch diameter PVC with 0.01-inch slotted screen. The wells were screened 10-40 ft BLS. The chemicals were mixed and then transferred to 55 gal. drums from which they were injected via gravity feed through a 3/4-inch diameter drop tube. The first injection event (July 19-23, 1999) consisted of the injection of 990 gal. of catalyst on the first day followed by 330 gal. hydrogen peroxide and 330 gal. water at 27 ft BLS on the second day. On the third day 1,20 gal hydrogen peroxide, 55 gal. catalyst and 60 gal. water. at 17 ft BLS. A total of 2,520 gal. hydrogen peroxide, 1,555 gal. catalyst and 900 gal. water were injected at 17 on the fourth and final day. Effective hydrogen peroxide injection concentrations were 8%. The second injection event (Aug. 23-27, 1999) was similar to the first event and the injected totals were 1,320 gal. catalyst, 2640 gal. hydrogen peroxide, and 1,260 gal. water. For the third injection event, an additional monitor well constructed of 1.25-inch diameter PVC, screened 10-20 ft BLS was installed. A total of 400 gal. of catalyst was injected followed by sparging 40 lbs. of carbon dioxide into the injection well and then 500 gal. of 25% hydrogen peroxide. The hydrogen peroxide was initially injected at 3 gpm at 0psi. Pressure buildup in two nearby monitor wells resulted in some groudnwater flow. The injection rate was decreased to 1 gpm at 20 psi and then later increased to 3 gpm at 15 psi.

Results to date:
Approximately 244 tons (174 cubic yards) of contaminated soil and concrete debris were removed from within and under the northeastern portion of the facility and the area immediately north of the northeastern portion of the building and disposed offsite. Contaminated soil was excavated to a depth of 4 feet. Prior to excavation, 24 helical piers were installed along two exterior walls and along one load-bearing interior wall to support the building foundation. Upon completion of the ecavation, four 4-inch diameter 10 foot long horizontal vapor extraction wells were installed two feet in the interior excavation. An additional 7 horizontal vapor extraction wells were installed two feet below the building floor slab in the area west and south of the excavation. Six injection wells were installed in the excavated area for future use. These wells were installed to a depth of 35 feet with 2.5 feet of 0.01-inch slot screens. Two clusters of three- monitor wells, screened 3-13, 19-24 and 30-35 feet were installed in the excvated area. Soil Vapor Extraction System startup February 2007. Six injections of Potassium lactate and denatured ethanol from January through July 2008. Jaunuary - August 2008 conducted monthly, quarterly and semi-annual monitoring. The soil vapor extraction system is currently operating at the site.

Next Steps:
Continued injections to address source area. Continued operation of SVE.

Why the technology was selected:
Soil vapor extraction with lateral vapor extraction wells was selected to recovery VOC vapors emanating from highly contaminated shallow groundwater under the facility floor slab. The wells were easily installe after the excavation of contaminated soils under the facility floor slab.

Date implemented:
Soil Vapor Extraction: February 7, 2007.

Final remediation design:
The soil vapor extraction system consists of 11 4-inch diameter vapor extraction wells (described below)installed in and adjacent to the excavation in the northeastern portion of the facility. The system is powered by a 7.5 HP blower. Offgas is treated via one 170 lb. carbon vessel. Designed system flow rate is 197 scfm with a vacuum of 15 inches W.C.

Results to date:
Approximately 244 tons (174 cubic yards) of contaminated soil and concrete debris were removed from within and under the northeastern portion of the facility and the area immediately north of the northeastern portion of the building and disposed offsite. Contaminated soil was excavated to a depth of 4 feet. Prior to excavation, 24 helical piers were installed along two exterior walls and along one load-bearing interior wall to support the building foundation. Upon completion of the ecavation, four 4-inch diameter 10 foot long horizontal vapor extraction wells were installed two feet in the interior excavation. An additional 7 horizontal vapor extraction wells were installed two feet below the building floor slab in the area west and south of the excavation. Six injection wells were installed in the excavated area for future use. These wells were installed to a depth of 35 feet with 2.5 feet of 0.01-inch slot screens. Two clusters of three- monitor wells, screened 3-13, 19-24 and 30-35 feet were installed in the excvated area. Soil Vapor Extraction System startup February 2007. Six injections of Potassium lactate and denatured ethanol from January through July 2008. Jaunuary - August 2008 conducted monthly, quarterly and semi-annual monitoring. The soil vapor extraction system is currently operating at the site.

Next Steps:
Continued injections to address source area. Continued operation of SVE.

Date implemented:
Soil Vapor Extraction: February 7, 2007

Final remediation design:
The soil vapor extraction system consists of 11 4-inch diameter vapor extraction wells (described below)installed in and adjacent to the excavation in the northeastern portion of the facility. The system is powered by a 7.5 HP blower. Offgas is treated via one 170 lb. carbon vessel. Designed system flow rate is 197 scfm with a vacuum of 15 inches W.C.

Results to date:
Approximately 244 tons (174 cubic yards) of contaminated soil and concrete debris were removed from within and under the northeastern portion of the facility and the area immediately north of the northeastern portion of the building and disposed offsite. Contaminated soil was excavated to a depth of 4 feet. Prior to excavation, 24 helical piers were installed along two exterior walls and along one load-bearing interior wall to support the building foundation. Upon completion of the ecavation, four 4-inch diameter 10 foot long horizontal vapor extraction wells were installed two feet in the interior excavation. An additional 7 horizontal vapor extraction wells were installed two feet below the building floor slab in the area west and south of the excavation. Six injection wells were installed in the excavated area for future use. These wells were installed to a depth of 35 feet with 2.5 feet of 0.01-inch slot screens. Two clusters of three- monitor wells, screened 3-13, 19-24 and 30-35 feet were installed in the excvated area. Soil Vapor Extraction System startup February 2007. Six injections of Potassium lactate and denatured ethanol from January through July 2008. Jaunuary - August 2008 conducted monthly, quarterly and semi-annual monitoring. The soil vapor extraction system is currently operating at the site.

Next Steps:
Continued injections to address source area. Continued operation of SVE.

Why the technology was selected:
Excavation was selected because of the shallow water table and the ability to gain access to excavate highly contaminated soil beneath the building floor slab.

Date implemented:
Excavation: August 3-25, 2004

Results to date:
Approximately 244 tons (174 cubic yards) of contaminated soil and concrete debris were removed from within and under the northeastern portion of the facility and the area immediately north of the northeastern portion of the building and disposed offsite. Contaminated soil was excavated to a depth of 4 feet. Prior to excavation, 24 helical piers were installed along two exterior walls and along one load-bearing interior wall to support the building foundation. Upon completion of the ecavation, four 4-inch diameter 10 foot long horizontal vapor extraction wells were installed two feet in the interior excavation. An additional 7 horizontal vapor extraction wells were installed two feet below the building floor slab in the area west and south of the excavation. Six injection wells were installed in the excavated area for future use. These wells were installed to a depth of 35 feet with 2.5 feet of 0.01-inch slot screens. Two clusters of three- monitor wells, screened 3-13, 19-24 and 30-35 feet were installed in the excvated area. Soil Vapor Extraction System startup February 2007. Six injections of Potassium lactate and denatured ethanol from January through July 2008. Jaunuary - August 2008 conducted monthly, quarterly and semi-annual monitoring. The soil vapor extraction system is currently operating at the site.

Next Steps:
Continued injections to address source area. Continued operation of SVE.