1st
GW contaminated with BTEX, PAHs, tetrachloroethylene
Institutional controls to restrict GW use; GW extraction and treatment at the existing on-site wastewater treatment plant; discharge of the treated GW to the river via a NPDES permit
2
GW contaminated with VOCs, PAHs, and LNAPLs
Capping; SVE; institutional controls Present Worth - $11,409,000 O&M - $32,702
3rd
No remedial action; continued monitoring
Soil contaminated with heavy metals
GW no action; Soil removal of surface debris; stabilization/solidification of contaminated soil; installation of top cover
1st
Soil and ground water contaminated with organics and inorganics
Soil cover over the DuPont Impoundment; access restrictions include deed limitations and site fencing; site maintenance which includes mowing the grass and repairing the fence; ground water monitoring system which includes implementation of further remedial actions if certain chemical-specific action levels are exceeded; replacement of the Bark residence drinking water well in the deeper bedrock aquifer
GW contaminated chromium
Monitoring with a contingency for GW extraction and discharge to the POTW
VOCs and PAHs have leached from tars into GW
Off-site incineration of tars; GW treatment via filtration, polymer injection, settling, and carbon adsorption systems; in situ treatment of coal gas migration areas
GW contaminated with VOCs
Continued monitoring; if necessary, implementing measures to meet MCLs
1st
GW contaminated with NAPLs, lead, manganese, benzene, carbon tetrachloride, 1,1-dichloroethene and trichloroethene
Develop an alternate potable water supply for the plant; extract groundwater; extract/treat NAPLs; deed restrictions; develop a contingency plan to assure that contaminants would not migrate off-site in the event of the plant shutdown
Soil contaminated with arsenic, cadium, chromium, and lead
Deed restrictions; fencing; limited land use
High concentrations of cement kiln dust (CKD)
Pond draining; drain system construction; CKD consolidation and capping; installation of CKD dewatering wells
Soil and GW contaminated with VOCs
Asphalt capping over TCE cont. soils; GW UV catalyzed oxidation; discharge to POTW; monitoring Present Worth - $2,100,000
Soils, sludges, and GW contaminated with chromium
Soil and sediment treatment via in-situ immobilization; capping contaminated areas; grading and seeding
1st
Soil contaminated with metals (including cadmium and cyanide)
Excavation of contaminated soil with either onsite or offsite stabilization, followed by offsite disposal; backfilling and grading of the excavated area to support a vegetative cover
GW contaminated with VOCs
GW treatment via air stripping; capping of the waste disposal cell
Amendment
GW contaminated with VOCs
No action; institutional controls Present Worth - $145,530
Final
Surface and GW contaminated by waste kiln dust
Dewatering of West Quarry; construction of permanent drain system; install engineered clay cap over the area of West Quarry filled with cement kiln dust
Soils and GW contaminated with VOCs and PAHs
Excavation and off-site incineration of soils; GW extraction and treatment; discharge treated GW to City of Dubuque sewer system; monitoring
GW, soils and sediments contaminated with VOCs
Construction of low permeability cover system over waste disposal area; long-term GW monitoring; fencing; and institutional controls Present Worth - $2,430,000 O&M - $65,000/yr. for 5 yrs, and $45,000/yr. for 25 yrs.
Soil contaminated with PAHs
Soil treatment via fixation/stabilization; capping; and GW monitoring
1st
GW contaminated with cadmium, chromium, lead, mercury, benzene, ethylbenzene, methyl ethyl ketone, toluene and xylenes; soil contaminated with metals
Contaminated soils will be excavated and treated using bioremediation, however, if testing shows bioremediation to be infeasible due to high metal levels, on-site thermal treatment will be implemented; treated soil will be stabilized if necessary to prevent leaching of metals and placed back into the excavation and covered; solid and liquid waste will be separated for off-site incineration, recycling or disposal; GW will be pumped and air stripped using carbon adsorption and with discharge to the nearby stream; and deed access restrictions
Heavy metal landfill contamination; GW contaminated with VOCs
Perimeter fencing; deed restrictions; landfill cover with impermeable layer of topsoil; install additional GW monitoring wells; pump and treat GW until benzene level is below 1 ppb
Coleman OU GW contaminated with trichloroethene, 1,1,1-trichloroethene, tetrachloroethane, cis 1,2-dichloroethene, 1,1-dichloroethene, and vinyl chloride
Enhancement of existing GW extraction and treatment system; GW monitoring; expansion of existing SVE system; and monitoring of SVE system
1st
Sludge contaminated with organics (including PAHs and sulfuric acid)
In-situ neutralization of the acid sludge waste, followed by construction of a soil cover over the waste area; institutional controls including deed restrictions; GW monitoring; completion of feasibility study addressing the subsequent sediment and GW operable unit
2nd
Soil and GW contaminated with low concentrations of organic and inorganic contaminants
No further action
1st
GW and soils contaminated with low levels of metals
No further action
2nd
GW and soil contaminated with metals (including barium, cadmium, chromium, copper, lead, manganese, mercury, nickel, selenium, silver and zinc
Removal and selective placement of the surface mine wastes; diversion and channelization of surface streams; recontouring and vegetation of land surface; investigation of deep aquifer wells
1st
GW contaminated with VOCs, semi-VOCs, pesticides and heavy metals; soils/waste materials contaminated with PAHs, phthalates, VOCs, pesticides, PCBs and heavy metals
Removal and off-site treatment of contaminated liquids currently ponded underground; construction of an impermeable multi-layer cap over the majority of the waste disposal area; collection and, if necessary, off-site treatment of significant GW seepage; extended GW monitoring; deed and access restrictions; and if necessary, the response action will be modified to include partial GW controls (including construction of a clay cutoff wall and extraction and off-site treatment of collected GW
1st
Large volumes of mining wastes; mineralized acid mine water filling old shafts; higher-than-average incidence of lung cancer
Alternate water supply
GW contaminated with VOCs, primarily TCE
Hydraulic containment; institutional controls; monitoring; additional source control activities
No significant contamination in the sediment-free GW
No further action
1st
GW contaminated with lead and other metals
No further action
GW contaminated with vinyl chloride and methylene chloride
Institutional controls; monitoring; contingency for further action Net Present Worth - $100,000
1st
Soil and sludge contaminated with PAHs
Removal and dewatering of sludge via heating, pumping, and flashing; soil treatment via flushing with water; and aeration of pond water
Soil and GW COCs include VOCs
GW extraction and treatment via air stripping; discharge to Posey Creek (through POTW); in-situ soil vapor extraction to remove VOCs from soil w/out excavation; institutional controls; monitoring GW Present Worth - $3,511,000 Soil Present Worth - $3,207,000
1st
GW and onsite structures contaminated
Capping; GW pump and treatment; monitoring
Soils contaminated with dioxin
Excavation and thermal treatment of contaminated materials
1st
Shallow GW contaminated with VOCs; soils contaminated with PCBs
Groundwater extraction wells near the suspected contaminant source(s), completed or screened in the upper granular unit; an option for further GW treatment using granular activated carbon is retained; GW discharge after treatment to POTW; removal of surface and near-surface soils contaminated with PCBs and other organic compounds
1st
Soil, sediments, GW and SW contaminated with low levels of unspecified wastes
Removal and offsite treatment or disposal of drum and drum remnants east of Fulbright Landfill; GW, SW, and leachate monitoring; deed restrictions
1st
Subsurface soil contaminated with pesticides, volatile organics, and semi-volatiles; surface soil contaminated with pesticides; sediment contaminated with pesticides
Excavation of approximately 4050 cubic yds of contaminated soil and sediment; disposal at off-site land disposal facility
2 Amendment
GW and Formulation Building
Amendment addresses changes only with respect to Formulation Building Present Worth - $1,230,000
Soils, sediments, buildings, and structures contaminated with PCBs
Excavation and off-site disposal of 826 cy of sediments above .18 ppm PCBs; excavation and off-site disposal of 4788 cy of soil contaminated above 10 ppm PCBs; dismantling of main building and south warehouse; backfilling of all excavated areas; and GW monitoring
Sub
Soil and sediment contaminated with TCDD (dioxin)
Temporary storage of soil in onsite RCRA facility
Sub
Soil contaminated with TCDD (dioxin)
Temporary storage of soil in an onsite RCRA facility; institutional controls to include site access restrictions
Soils contaminated with PCBs; GW contaminated with VOCs
Excavate all soils and sediments with PCB concentrations greater than 10 parts per million; incinerate on-site; pump and treat GW via air stripping
GW contaminated with benzene, xylene, and MTBE
No further action
GW COCs include hexavalent chromium and trivalent chromium
GW extraction and treatment via reduction/precipitation, and discharge to Ditch No. 4 under state operating permit Present Worth - $1,166,000
1st
Soils and structures contaminated with dioxin
Excavation of all dioxin-contaminated soils exceeding 1ppb; placement of soils in lined polypropylene bags and store in RCRA-equivalent steel storage structures on-site; decontamination of on-site structures
final
Soils contaminated with dioxin
Excavation of contaminated materials to the Times Beach site; thermal treatment of materials at a temporary thermal treatment facility at Times Beach; final restoration of Shenandoah Stables
1st
Three GW aquifers contaminated primarily with trichloroethene; soil gas concentrations high for benzene, 1-1-dichloroethene and methylene chloride and VOCs; GW contaminated with VOCs; zinc, cadmium, chromium, copper, lead, mercury and nickel
GW extraction using existing and new wells; onsite treatment of extracted GW using two existing air strippers; discharge of treated water to city sewer system for further treatment; city ordinance to prevent construction of drinking wells in or near contaminated GW plumes; continued monitoring
1st
Soil and equipment contaminated with dioxin
Excavation of contaminated soil; dismantle/clean equipment; maintain vegetative cover over surface soils 1 ppb dioxin; vegetative clay cap over trench area; gravel drainage interception trench upgradient of trench area.
2
GW contaminated with VOCs
No Further Action; monitoring O&M - $120,000
2nd
Soil, structures and debris contaminated with dioxin
Demolition and onsite disposal of all structures; excavation and thermal treatment of dioxin-contaminated soil exceeding 20 ug/kg with onsite residual disposal; capping of areas contaminated with dioxin not exceeding 20 ug/kg; construction of a ring levee for flood protection of temporary thermal treatment unit
Wainwright OU
Soil and GW contaminated with VOCs, metals, and PAHs
Soil vapor extraction; limited excavation and off-site treatment of VOC- and PAH-contaminated surface soils; GW extraction and treatment via air sparging; institutional controls; monitoring; air sampling Net Present Worth - $3,992,649
2nd
Quarry bulk wastes contaminated with nitroaromatic compounds
Removal and storage of bulk wastes on-site
3
Soils, sludge, sediments, GW, and storage materials contaminated with radionuclides, metals, PCBs, PAHs, and asbestos
Removal, chemical stabilization/solidification, and disposal on-site Present Worth - $157,000,000
GW contaminated with VOCs
Upgrade existing cover over disposal units; monitor GW; site maintenance; deed restrictions; security restrictions
1st
Soils contaminated with VOCs
On-site incineration of soils; stabilization of metal contaminated soils and placement in an on-site RCRA Subtitle C Hazardous Waste Landfill
1st
Soil contaminated with VOCs (including TCE and PCE)
In-situ soil vapor extraction with activated carbon treatment of extracted vapor, if necessary; soil, GW and air monitoring
2nd
Soil contaminated with carbon tetrachloride and ethylene dibromide
In-situ soil vapor extraction with treatment of extracted vapor using activated carbon, if necessary; access restrictions; soil, air and GW monitoring
Sub
GW and soil-gas contaminated with VOCs
Soil vapor extraction and treatment of air emissions by granular activated carbon (GAC); GAC will be transported off-site to an approved treatment facility for regeneration or incineration; monitoring contaminants in the soils above the aquifer; GW and air emission systems monitoring
GW
GW contaminated with VC, TCE, and DCE
Geotechnical testing of existing cap; fencing, deed restrictions; design of GW extraction and treatment system
Plume 1 OU 13; Plume 2 OU 18 (Interim)
GW contaminated with VOCs
GW extraction and treatment via GAC; monitoring Present Worth - Plume 1 - $1,104,000; Plume 2 - $829,000
Soil and GW contaminated with VOCs and SVOCs
Pilot study to evaluate practicability of vacuum extraction of VOCs for contaminated soils; GW pump and treat; install additional GW monitoring wells; monitoring
GW COCs include VOCs
GW monitoring and institutional controls Present Worth - $465,505
GW and Soils contaminated with VOCs
Soil thermal destruction; GW air stripping; GW air sparging; GW SVE Present Worth - $6,833,135
Soil, soil gas, and GW contaminated with carbon tetrachloride and chloroform
Extraction of GW and treatment via existing air strippers; active soil gas extraction using existing system of soil vapor extraction wells; continued monitoring of plume
To obtain copies of selected Records of Decision, please fill out the INSS request form or e-mail your request to inss@envinfo.com. The Network also can be reached via telephone at (202) 467-7777 or FAX at (202) 467-7176.