Supplemental ROD; Leachate contaminated with VOCs including benzene, xylene, lead, chlorobenzene, and trichlorofluoromethane
Off-site disposal and treatment of leachateCapital - $1,406,000O&M - $951,000Present Worth - $2,241,000
2nd
Soil contaminated with PCE and TCE; GW contaminated with TCE, PCE, TCA and toluene; air in buildings contaminated with TCE and PCE
In-situ soil vacuum extraction system; GW extraction, treatment and discharge within a highly contaminated portion of the aquifer known as the Source Area Capital - $6,000,000O&M - $3,000,000Present Worth - $9,000,000
1st
Leachate, soils, GW, SW contaminated with VOCs, organics and inorganics
Cap landfill; maintain present leachate collection system; implement a ground water extraction/leachate collection system to supplement the cap in depressing the water table, extract leachate not intercepted by the existing leachate collection system, and extract highly contaminated shallow ground water to the bottom of the shallow bedrock in the immediate vicinity of the landfill; treat leachate and contaminated ground water at the Naugatuck Water Pollution Control Facility and continue monitoring of environmental media for 30 years
GW and soils contaminated with VOCs
Soil vacuum extraction; GW air stripping, ultraviolet oxidation, monitoring and institutional controlsPresent Worth - $7,708,400O&M - $6,305,500
Area A Landfill contaminated with VOCs, SVOCs, PAHs, pesticides, PCBs, and heavy metals
Access restrictions, site grading and storm water management, horizontal barrier cap installation, leachate collection and treatment, post-closure, GW monitoring - Capital cost - $3,919,869, O&M - $1,823,818
SVOCs; PAHs
Interim remedial action for limited source control; relocation of affected businesses and residences; excavation and consolidation of highly contaminated materials into lined disposal area; cap landfill area; gas collection system installation; monitoring; institutional controlsPresent Worth - $16,035,000O&M - $4,537,000Relocation - $1,760,000
Soil contaminated with VOCs - acetone, ethylbenzene, and xylene; however, contamination is limited; GW sampling found high concentrations of aluminum and iron
No Action
1st
Soil, sludge and GW contaminated with VOCs, semi-VOCs and heavy metals
Lagoon covered with an impermeable cap compliant with RCRA; dike improvement around the lagoon; GW monitoring to ensure that ACLs are not exceededCapital - $2,259,300O&M - $716,600
1st
Sediments and GW contaminated with VOCs, arsenic, base/neutral organic compounds and pesticides
Excavation and on-site incineration of contaminated sediments; treated sediments will be placed on-site as backfill material; utilization of silt curtains in the river to minimize the possibility of suspended sediments being transported downstream during excavation; restoration of wetland areas; placement of clean backfill in excavated areas of the river; long-term monitoring of downstream portions of the riverPresent Worth - $1,656,000
4th
Iron and manganese exceed federal drinking water standards in the Donna Road Aquifer
GW extraction and treatment via the addition of potassium permanganate to the extracted waterCapital - $992,000O&M - 423,000Present Worth - $1,188,000
Soil contaminated primarily with cPAHs and TPHC
Excavation and stockpiling of soils; cold mix asphalt batch soils exceeding cPAHs level of 7 ppm and TPHC level of 500 ppm; pavement wearing course application; monitoringPresent Worth - $1,937,000O&M - $72,000
1st
Soil contaminated with VOCs and PCBs
Thermal aeration of contaminated soils; incineration of PCB-contaminated soil; installation of a groundwater monitoring system; removal of contaminated buildings and tanksPresent Worth - $3.4 million
Sub
GW contaminated with benzene, arsenic, bis(2-ethylhexyl) phthalate, and trichloroethene; landfill vent emissions contain VOCs; sediments contaminated with PAHs
Extraction of contaminated shallow groundwater plumes, and combined biological-based treatment of the groundwater with leachate collected from the landfill cap system; deep bedrock groundwater and residential well monitoring; collection and incineration of landfill vent gas emissions; excavation and solidification of contaminated brook sediments; sediments will be placed in existing landfill and capped as part of the phase II source control remedy for the sitePresent Worth - $11,320,000
1st
Soil and groundwater contaminated with organics
In situ vacuum extraction of approximately 20,000 cubic yards of unsaturated soils followed by activated carbon treatment of the extracted VOCs; active restoration of the overburden/bedrock aquifer contaminated primarily with VOCs by treatment of contaminated groundwater removed from the site by aeration and carbon adsorption and air strippingPresent Worth - $4,100,000
1st
GW contaminated with VOCs, primarily TCE
Extract and treat GW via UV light and oxidation; institutional controls; monitoringCapital - $3,800,000O&M - 333,000Present Worth - $8,900,000
1st
Soil, sludge and GW contaminated with PAHs, VOCs, metals, inorganics and base-neutral extractables
Treat contaminated soil and sludge from the lagoons by bioremediation; returning the treated material to the lagoon area and covering with soil and revegetation; decontaminate the lagoon system's piping and pumps
Shaffer OU
GW contaminated with VOCs primary VOCs of concern - arsenic, benzene, DCE, TCE, vinyl chloride and xylene
Reconstruct cap over entire landfill; construct leachate collection facilities and fence; monitoring; and institutional controls
GW contaminated with PCE , TCE, and vinyl chloride
Construction of landfill cap; post-closure maintenance and monitoring of the cover system
GW contaminated with PCE, DCE, TCE, and heavy metals
GW extraction and treatment for an estimated 20 years - Net Present Worth - $179,352,000
Soils contaminates with PCE, xylenes, PAHs, and heavy metals
No Action; monitoring - Present Worth - $44,321
1st
Hot spot OU; Sediments contaminated with PCBs
Dredging of sediments; transportation to Pilot Study cove area, and sediment dewatering; incineration of dewatered sediments; stabilizationCapital - $14,379,300
1st
Soil, sediments contaminated with metals, PCBs, PAHs, semi-VOCs and VOCs
Excavation and treatment by solvent extraction and on-site disposal of soils, dredge pile materials and sediments; off-site incineration of the oil extract from the solvent extraction process; soil cover over disposal area; flushing and cleaning of roof surfaces and drainage system; decontamination of equipment, machinery and floor surfaces by solvent washing; barrier drain trench to collect on-site overburden and shallow bedrock GW; GW treatment using carbon adsorption for PCB removal and air stripping for VOC removal and precipitation/filtration for metals removal; wetland restoration/enhancement; long-term environmental monitoring; institutional controlsCapital - $11,767,000O&M - $3,994,000Present Worth - $16,100,000
ROD Amendment
Change to cap
Estimated Savings $45 million
2nd
Soil and GW contaminated with VOCs
Extract and treat GW via chemical and physical processes; discharge treated GW into the Sudbury River; institutional controls; monitoringCapital - $3,870,000O&M - $1,820,000Present Worth - $5,690,000
3rd
Sediments contaminated with mercury
Excavation of sediment with mercury contamination above 1mg/kg; dewatering of contaminated sediment; disposal of dewatered sediments under cap constructed under 1st OU; wetlands restoration; institutional controls; and creation of 4th OU for investigation of Sudbury River
Soils contaminated with pesticides, PAHs, DDT, DDE, DDD, lead, and chlordane
Site preparation and grading; excavation and off-site treatment of lab waste; excavation and consolidation of contaminated soil; capping; O&M; and institutional controls - Present Worth - $2,475,270
1st
GW contaminated with PCE and TCE
Extract and treat GW via carbon adsorption ; and monitoring
Soil and GW contaminated with VOCs, PCBs, PAHs, and DDT residues
Decontamination, demolition, and off-site disposal of structures; in-situ mixing and stabilization of property soils and sediments; install permeable cap; wetlands restoration; GW monitoring; institutional controls; and five-year review
ESD
Change treatment
Estimated Savings = $2 million
Sub
Soil, sediments and GW contaminated with PCBs, VOCs and inorganics
KPEG dechlorination; onsite placement of soil; GW pump and treatment with reinjection; institutional controlsCapital Cost - $19,911,000O&M - $13,748,000
1st
Soil contaminated with PCBs and VOCs; GW contaminated with VOCs
Excavation and on-site incineration of contaminated soil and sediment to 13 ppm PCBs; active restoration of the shallow overburden aquifer using on-site treatment involving air stripping and carbon adsorption; installation of a bedrock well to prohibit contaminant migration into fractured rock; similar treatment of Rose's pond sediments and surface water; restoration of pond to original wetlands character after remediation; implementation institutional controls to prevent groundwater use and excavation into the saturated zone within the disposal areaCapital - $674,400O&M - $5,790,00 (present worth)
Site contaminated with lead, arsenic, chromium, VOCs, PAHs, PCBs, and dioxins/furans
Excavation and pretreatment of contaminated soils/sludges; on-site soil fixation of all soils/sludges above soil cleanup levels; and removal of treated material to permitted landfill off-site
GW contaminated with VOCs, SVOCs, pesticides, and PCBs
Landfill closure; survey; improve storm water diversion and drainage; landfill cover maintenance; gas collection; monitoring - Present Worth - $2,219,000
1st
Soil, sediments, and GW contaminated with metals, VOCs, semi-VOCs, pesticides and PCBs
Excavation/solidification of 24,000 cubic yards of contaminated on- and off-site saturated soil; excavation, dewatering and solidification of approximately 1,900 cubic yards of contaminated sediments (both will be replaced on-site); construction of an impermeable cap (four layers) over most of the disposal site; active GW collection system; temporary diversion and lining of stream; passive underdrain collection system; GW treatment (oxidation/filtration for metals removal and ultraviolet/ozonation for organics removal); wetland restoration/enhancement; long term environmental monitoring; institutional controlsPresent Worth - $10,100,000
Middle Marsh OU - contaminated with PCBs, VOCs, and SVOCs
Excavate and dewater sediments and soils; disposal of soils under cap; restoration of affected wetlands; institutional controls; monitoringCapital - $2,640,000O&M - $164,000Present Worth - $2,800,000
1st
Soil contaminated with VOCs, PCBs, PAHs, lead and pesticides; GW contaminated with VOCs; sediments contaminated with PAHs and metals; SW contaminated with low levels of VOCs
Excavation and on-site incineration of contaminated soil; in-situ volatilization of contaminated soil using carbon adsorption for vapor treatment; pump and treatment of contaminated GW using air stripping and carbon adsorption; removal and disposal of contaminated sludge and debrisPresent Worth - $68,400,000
1st
Soil, GW, debris, and sludge contaminated with VDC, vinyl chloride, ethyl benzene, benzene, bis(2-ethylhexyl)phthalate, phenol, metals and formaldehyde
Excavation of contaminated material for the Blowdown Pit and off-site incineration; excavation and stabilization of remaining contents of Pit as well as contaminated sludge and soils of the Primary, Secondary, North and Emergency lagoons; excavation of contaminated soils from the Battery Separator, Boiler lagoons and Tank Car area; placing both stabilized and non-stabilized materials from the site on the existing Industrial landfill and covering with an impermeable cap; post excavation sampling and analysis; capping the Battery Separator Chip pile; covering any disposal area which attains soil cleanup goals; modifying the Aquifer Restoration System to address air stripper emission controls; long-term environmental monitoringCapital - $4,590,000O&M - $2,478,000Total - $7,058,000
1st
Soil, sediment, and GW contaminated with DCE, arsenic, chromium, lead, and mercury
Construction of low permeability RCRA cap over the landfills; construction of slurry wall; extraction and treatment of GW via chemical oxidation, flocculation, clarification, and filtration, as well as UV oxidation to destroy VOCs; monitoring; institutional controls
5-6
Buried pipes covered with asbestos
Development of health and safety plan for handling asbestos-containing material; containerization of material and transport to the Sites 1 and 3 landfillTotal Cost - $680,700
8
Soil, construction debris, and rubble at site 8 contaminated with polynuclear aromatic hydrocarbons
Excavation and transportation of PAH-contaminated soil and debris to Sites 1 and 3 landfill prior to capping Capital - $328,000O&M - NANet Present Worth - $328,000
Site 9 GW
GW contaminated with vinyl chloride, 1,1-DCA, 1,2-DCE, 2-Butanone, Toluene, PAHs, and Mercury
Natural attenuation of GW; monitoring; 5-yr. reviewNet Present Worth - $434,000Net O&M - $434,000
2
Soils contaminated with VOCs and PAHs
Installation of multi-layer cover system that complys with RCRA Subtitle C and ME hazardous waste requirements; installation of gates and warning signs; deed restrictions; monitoringNet Present Worth - $23,400,000Net O&M - $754,000
6
Soils contaminated with VOCs and PAHs
Excavation and off-site disposal of soil at licensed landfill or treatment facility; site review and confirmation samplingNet Present Worth - $183,000Net O&M - $0
7
Soil and sediment contaminated with SVOCs, pesticides, PAHs, and PCBs that threaten Greenlaw Brook wetland
Excavation of soil and sediment with placement at OU2 Landfills as subgrade material for landfill cap construction; wetlands restoration; monitoring
Contaminants of no significant concern
No Action
1st
Soil, sediments contaminated with lead, PCBs, and PAHs; SW contaminated with PCBs, lead and aluminum; GW contaminated with PCBs, dichlorobenzene and benzene
Pumping contaminated SW and transport via tanker trucks to off-site treatment facility; treatment of contaminated soils and sediments using a solvent extraction technology; the contaminated liquid will be destroyed at a licensed, off-site TSCA incinerator; air pollution control devices will be implemented during the on-site solvent extraction process; soil and sediment treatment residues containing lead levels greater than 248 ppm will undergo further treatment using a solidification/stabilization technology; backfilling of site; compensatory wetlands; GW treatment using collection and carbon adsorption; GW and sediment sample monitoring; public education regarding contamination and institutional controlsPresent Worth - $14,221,000
1st
Soil and GW contaminated with PCBs and organics
Off-site incineration of PCB-contaminated soils greater than 50 ppm and on-site solvent extraction of additional PCB- and organic- contaminated soils; incineration in a TSCA-licensed facility of liquid PCBs and other organic chemicals extracted from the soil; revegetation; site access restrictions and institutional controls; monitoring; GW collection and carbon adsorption treatment with discharge back into aquifer; institutional controls on the use of site GW Present Worth - $947,000O&M - $896,000Capital - $3,730,000
Amendment
Soil contaminated with PCBs
Off-site incineration of soils geater than 500 ppm PCB; off-site land disposal of soils between 5-500 ppm PCBsPresent Worth - $3,017,000O&M - $0
ESD
Review proposed pump and treatment
Estimated Savings = $2 million
1st
Soil contaminated with chromium, VOCs and semi-VOCs; GW contaminated with chromium; sediments contaminated with chromium and arsenic
Contaminated sludge will be contained using a cover; site will be converted into a permanent state conservation area (institutional controls); GW monitoring network to detect chromium and arsenic contamination Capital - $6,661,600O&M - $9,500Present Worth - $9,211,600
GW and soil contaminated with VOCs
Excavation of soil and on-site low-temperature soil aeration; vacuum-enhanced GW extraction; decontamination and demolition of facilitiesPresent Worth - $10,654,000
1st
Soil, GW contaminated with VOCs, semi-VOCs, metals, pesticides
GW collection/treatment using chemical coagulation, precipitation, air stripping and discharge to on-site recharge trenches; quarterly GW monitoring; placing a natural and synthetic cap over Operable Unit III area including a vegetative cover, a subsurface drainage layer and a low permeability layer that will underlie the drainage layerCapital - $10,700,000O&M - $1,460,000/yr.Present Worth - $24,100,000
1st
GW and Soil contaminated with VOCs, pesticides, metals, and ABNs
Excavation of soil; consolidation of waste; installation of cap; GW extraction and treatmentCapital - $12,800,000O&M - $245,000Present Worth - $20,200,000
2nd
GW exceeds off site cleanup levels - predominant VOCs include aromatics, chlorinated hydrocarbons and ketones, the most frequently detected include chloroethane, 1,1-DCA, chlorobenzene, ethylbenzene, and benzene
Natural attenuation for GW plume; monitoring; institutional controlsPresent Worth - $1,412,000O&M/yr. - $98,000
ESD
Modify landfill gas remedy
Estimated savings = $650,000
Soil contaminated primarily with ethylbenzene, toluene, xylene, methyl butyl ketone, acetone, and methyl ethyl ketone
Construct cap for landfill; recontour landfill; GW extraction and treatment; monitoring; institutional controlsPresent Worth - $24,155,700
Soil and GW contaminated with petroleum hydrocarbons, PCE, TCE, 1,1,1-TCA, toluene, and 1,2-DCA
Natural attenuation of overburden and bedrock GW; institutional controls restricting GW use in the town garage and hillslope areas of the site; monitoring; GW cleanup levels have been set based on available ARARs
1st
Waste pile contaminated with chromium, silica, and nickel; GW contaminated with TCE and DCE
Removal of septic tanks and contents; excavation and off-site disposal of contaminated soils; GW restoration via air strippingPresent Worth - $7,276,000
1st
GW and soils contaminated with VOCs
Vacuum extraction of contaminated soils; pumping and treatment of contaminated groundwater using air stripping, filtration, and carbon adsorption and discharging the treated groundwater back into the ground Present Worth Capital - $1,937,300Present Worth O&M - $4,157,700
GW and soil contaminated primarily with arsenic, 1,1-dichloroethane, ethylbenzene, toluene and xylene
Install GW interceptor trench, temporary ground surface cap, and VES system; installation of security fenceCapital - $410,000O&M - $280,000Present Worth - $690,000
1st
Soil, sediment and GW contaminated with TCE, PCBs, VOCs, organics and inorganics
Onsite incineration of soil <<20 mg/kg PCBs; aeration of soils >>20 mg/kg PCBs and >>1 mg/kg total VOCs; GW pump and treatment with reinjectionCapital Cost - $8,592,500O&M - $1,735,000
Source Control(Site 34, JETC)
Soils at the Jet Engine Test Cell (JETC) contaminated with VOCs
Excavation and off-site treatment/disposal, dewatering of soil with treatment of extracted GW on-site, backfill, monitorPresent Worth - $1,614,000O&M - Incorp. into PW
Zone 4
Soils and GW contaminated with VOCs
Excavation and disposal at another base landfill scheduled for closure; RCRA composite-barrier type cap over LF 5; GW pump and treatPresent Worth - $4,596,000O&M - $2,065,400
GW contaminated with VOCs
Extract and treat GW via air stripping and ultraviolet oxidation; institutional controls; monitoringCapital - $2,400,000O&M - $1,400,000/yr.Present Worth - $15,500,000
Soil and GW contaminated with VOCs and SVOCs
Limited action, landfill cover, in-situ chemical treatment wall and GW diversion, GW extraction from Bedrock, and GW monitoringPresent Worth - $14,984,800 (1993 dollars)O&M - $2,240,000
1st
Soil, GW and SW contaminated with VOCs; sediments contaminated with PCBs and PAHs
In-situ treatment of contaminated soils with vacuum extraction and activated carbon; excavation and/or dredging of sediments to remove PCBs, sediments will be dewatered, placed in containers, and transported to an off-site, licensed RCRA landfill for disposal; active restoration of the GW aquifers using air stripping and carbon columns for air emission control; long-term environmental monitoring; and institutional controls Capital - $3,394,519O&M - $3,992,150
Memo
Turn off ground water pump and treat
Estimated savings = $3.6 million
GW contaminated with TCE, 1,2 DCE, benzene, Xylene, and MIBK
Capture GW through use of trenches and wells, as well as dewatering and vacuum extraction on-site; treat via UV-oxidation to meet interim cleanup levels ((based on ARARs (MCLGs and MCLs) as available));
Soil and GW contaminated with VOCs
Amendment to 1986 ROD
GW, SW, contaminated with VOCs, SVOCs, and inorganics; additionally, DNAPLs present in fractured bedrock beneath trenches at the hot spot
Installation of multi-layer RCRA C cap over existing 121 acre Phase I area; hydraulic containment and treatment of GW in hot spot area; deed restrictions; landfill gas collection evaluation; monitoring; fence installationNet Present Worth - $37,540,000 (POTW Discharge Option) $32,110,000 (SW Discharge Option)Net O&M - $1,760,000 (POTW Discharge Option) $1,160,000 (SW Discharge Option)
1st
Soil and GW contaminated with VOCs, inorganics, organics, oily wastes and pesticides
Onsite incineration; onsite disposal of treated soils; GW pump and treatment with reinjection; alternate water supplyPresent Worth - $27,805,000Source Control - $14,900,000Migration Component - $10,005,000Waterline - $2,900,000
ROD Amendment
Change source control
Estimated savings = $4 million
1st
Gas emissions include: methane, hydrogen sulfide and VOCs; GW and SW contaminated with low levels of VOCs and slightly elevated levels of inorganics
Install fence; develop a post-closure monitoring plan; upgrade the surface water runoff management system; stabilize the steep side slopes and install a synthetic cover on the uncovered northeast area of the landfill; establish vegetation; upgrade existing surface water management system; gas collection and thermal destruction (combustion, flaring and incineration); wetlands will be revegetated; site monitoring (both GW and air)Present Worth - $612,000 (subject to final design phase)
ESD
Clarify MCLs
GW contaminated with VOCs
GW extraction and treatment via coagulation/filtration and UV oxidation; discharge of treated GW to local wastewater treatment facility; and monitoring
1 (McAllister Point Landfill)
Soil contaminated with VOCs, PAHs, PCBs, and inorganics
RCRA Subtitle C multi-layer capping; gas controls; institutional controls; and monitoringPresent Worth - $8,000,000O&M - $2,300,000
1
Soil and GW contaminated with VOCs and arsenic
Soil excavation; capping; SVE; GAC; GW in-situ oxidation; discharge to POTW; institutional controls; and monitoringPresent Worth - $7,251,000O&M - 5,465,000
Soil contaminated with VOCs and semi-VOCs, as well as PCBs
Enhanced vapor extraction for VOC-contaminated soils; excavation and off-site disposal of PCB contaminated soils
1st
TCE migration into soil and bedrock aquifer
In situ vacuum extraction of soil; excavation of 550 cubic yards of landfill waste and sediment from within floodplain; restoration of GW using the innovative ultraviolet light and hydrogen peroxide technologyCapital - $2,275,930O&M - $164,400Present Worth - $4,316,485
3rd
GW contaminated with VOCs
Natural attenuation of GW with contingent active restoration; institutional controls; monitoringCapital - $1,049,076O&M - $2,990,151Present Worth - $4,039,227
2
GW and sediments contaminated with metals, VOCs, SVOCs, and low-levels of pesticides
Continued O&M of cap currently under construction; institutional controls; monitoring; natural attenuation of GWNet Present Worth - $2,900,000
GW showing signs of low level contamination of VOCs
No Action and monitoring
1st
GW, soil and leachate contaminated with PAHs, CAHs, MAHs, TCE, PCE, TCA, vinyl chloride, toluene, total xylenes and trans-1,2-dichloroethene
Leachate collection/groundwater extraction system; collected leachate and groundwater will be conveyed to a wastewater treatment facility (with pretreatment if necessary); institutional control to prohibit groundwater use in a specified area; monitoring of environmental media for 30 years; additional studies Present Worth - $5,374,000O&M - $173,000/yr.
2nd
LFG containing VOCs; soils containing PCBs and PAHs
Capping of waste areas 2,3, and 4; construction of french drains to collect GW and surface water; collection and venting of LFGs; side slope stabilization; and operation and maintenanceCapital - $5,568,000O&M - $123,000Present Worth - $8,692,800
Soil and GW contaminated with SVOCs, VOCs, and heavy metals
Installation of multi-layer caps on SWDA and IWS areas, source control extraction and treatment of GW; institutional controls; monitoringPresent Worth - $28,200,000O&M - $12,710,000
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.