1st
Soil, GW and SW contaminated with PAHs, dioxins and furans, organics and inorganics
Restricted site access (fence); onsite excavation/incineration of sludge, oil and soils; ash residue to be disposed of in a hazardous waste landfill; treatment of contaminated water by carbon adsorption; filter water to remove asbestos; monitoring
Impoundment sludges contaminated with PAHs, VOCs, and heavy metals
Amended ROD - Transportation of sludges and oil to permitted recycling facility
2nd
Soil, sediments, and GW contaminated with PAHs, VOCs, chlorinated dioxins, and furans
Excavation and bioremediation in a land treatment unit of ~59,000 cys of soils; chemical fixation of ~800 cys of soils contaminated with heavy metals; two-phase (ex-situ and in-situ) biological water treatment of ~526 million gallons of GW and LNAPLs; GW monitoring; building demolition; and institutional controls
1st
Acid mine drainage containing high levels of cadmium, copper, lead and zinc which contaminated SW and GW
Concrete plugs and surge pond construction to minimize releases of contaminated water, sludge or sediments to SW; measures to minimize SW flow into tunnel; monitoring program; system to lower water levels to limit migration of contaminated water; interim treatment plant to settle out metals before water is released to SW
1st
Drainage containing heavy metals
Passive/active treatment system for acid mine drainage discharge
2nd
Surface water & soil contaminated with heavy metals
Slope stabilization and run-off control
3rd
GW contaminated primarily with PCE and TCE
Curb residential exposure via connection of private well users to SACWSD water system
1st
GW contaminated primarily with PCE and TCE
GW extraction and treatment via air stripping
4th
GW contaminated with PCE, TCE, DCE, DCA, vinyl chloride, and benzene
Connection of Wells 18, 21,and 47 to the (KWTF) existing Granular Activated Carbon system for GW treatment; and transportation of treated water back to a storage reservoir for distribution
3rd
Phase II investigations for highly toxic and highly mobile liquid wastes
Capping of select mine wastes; and alternate drinking supply where required
Sub
Soil, sediment and debris contaminated with radium and decay products
Temporary onsite storage and final offsite disposal
Sub
Soil contaminated with radium and decay products
Onsite temporary containment followed by offsite disposal when available
Sub
Soil is contaminated with radium and decay products
Temporary onsite storage until a facility for permanent disposal becomes available with final offsite disposal
Sub
Soil and buildings contaminated with radium and decay products
Temporary onsite storage until a facility for permanent disposal becomes available with final offsite disposal
Sub
Soil and debris contaminated with radium and decay products
Onsite temporary containment of material followed by offsite permanent disposal when available
1st
GW contaminated with heavy metals
installation of mine seepage collection system; revegetation of Roaster Pile 1; capping of consolidated tailings pile; soil and sediment removal from Maloit Park wetlands and revegetate; and monitoring Present Worth - $17,374,400 O&M - $1,934,323
4th
SW contaminated with VOCs (TCE) metals (chromium), and radionuclides
Construction and utilization of three temporary surge tanks and associated piping to contain and transfer collected water; evaporation of 3 million gallons of pond water; distillate transfer to holding tanks; on-site solidificatoin of residual
1st
TCE, PCE, VOCs and organics in GW, soils and surface impoundments; metals in soils
Water treatment system
Interim response action for chemical process-related activities
sample chemical process equipment and materials to determine decontamination status; dismantle equipment and materials in preparation for removal/disposal
1st
Soil contaminated with chlorinated and organophosphate pesticides, herbicides, PAHs, arsenic and VOCs
Excavation and off-site incineration of soils contaminated with halogenated organic compounds, and disposal of soil residuals in a RCRA subtitle C minimum technology landfill; backfilling of excavated areas with clean soil; vacuum extraction of VOCs in soils; demolition and off-site disposal of buildings in compliance with the RCRA LDRs
5th
Soils contaminated by pesticides, VOCs, arsenic, and chromium
Excavation of soils; soil washing; incineration of wastewater; backfilling of treated soils
2 (L.C. Corp. Property)
Soil contaminated with metals, VOCs, and SVOCs
No Further Action
3 & 6 (48th and Holly LF)
GW, SW, sediment, and soil contaminated with VOCs
Institutional and engineering controls; monitoring Present Worth - $7,283,000 O&M - $240,000/yr.
5 Amendment to 9/28/90 ROD
Shallow soils contaminated with metals and pesticides
Soil excavation and on-site low temp. thermal treatment; off-site regeneration of spent activated carbon Present Worth - $5,400,000
4 (Site-wide GW)
GW contaminated with VOCs, SVOCs, metals, pesticides, and LNAPLs
Institutional controls; monitoring; dual vapor extraction of recoverable portion of LNAPL plume Net Present Worth - $3,866,500 O&M - $241,400/yr.
Heap Leach Pad
COCs include cyanide
Pump and treat cont. leachate; in-situ biotreatment of ore and leachate via cyanide-destroying bacteria; capping; monitoring Present Worth - $18,929,000
Reclamation
Reclamation of ~200 acres of disturbed land; rough grading; slope stabilization; seeding; weather protection Present Worth - $4,252,000 for 200 acres
Water Treatment
COCs include cyanide
Continued treatment of French Drain waters; completion of Heap Leach Pad remediation; containment of acid mine drainage during peak surface water flows that exceed Cyanide Destruction Plant capacity (500 gal. per min.) Present Worth - $26,874,691
Cropsy Waste Pile
COCs include cyanide
Excavation of CWP to and elevation of 11,620 ft.; excavation of Beaver Mud Dump and Summitville Dam Impoundment; line bottom of mine pits w/layer of pH neutralizing material; capping of excavated material in mine pits Present Worth - $40,837,975
1st
Soil contaminated with metals (arsenic and zinc); pesticides (aldrin, chlordane, 4,4-DDT, dieldrin, and toxaphene); and organics (PCDD, tetrachloroethene, and trichloroethene)
Excavation and treatment via off-site incineration of approximately 2050 cubic yds of pesticide contaminated soil; disposal in RCRA Subtitle C landfill; excavation of approximately 10,635 cubic yds of soil with low level pesticide contamination, volatile organic chemicals and metals; disposal in RCRA subtitle C landfill; backfilling excavated areas with clean soil, revegetation
1st
Arsenic, cadmium, and lead in soils, dust and GW
Mining waste; permanent relocation
2nd
Flue Dust OU
Removal and treatment via on-site cement/silicate based stabilization of ~316,500 cy of flue dust; and monitoring
GW, soil, and surface water contaminated with creosote, zinc, and benzene
Excavation and on-site biological treatment for soil; hot water flushing and surface chemical treatment followed by in-situ biological treatment for GW
Soils contaminated with PCP, PAHs, polychlorinated dibenzo-p-dioxins, and polychlorinated dibenzofurans
Excavation and surface land biological treatment of ~19,000 cys of soils; steam flushing soils underlying pole plant facility; separation and disposal of oily wood treating fluid extracted from soils; GW extraction and treatment to meet MCLs
1st
Soils contaminated by various organic and inorganic wood treating compounds; GW contaminated primarily by organic wood treating compounds and non-aqueous phase liquids (NAPL)
Contaminated soils will undergo a two-step enhanced biodegradation treatment (at completion, the waste pit area will be closed according to RCRA closure requirements); oil recovery wells will be used to collect highly contaminated groundwater which will undergo treatment in a fixed bed bioreactor prior to reinjection through a rock percolation bed; an in-situ enhanced biorestoration program will be initiated in the upper aquifer to reduce contaminant levels; groundwater use restrictions
Soil and GW contaminated primarily with PCP, PAHs, polychlorinated dibenzo-p-dioxins and polychlorinated dibenzofurans
Excavation and treatment of ~218,000 cys of soils via above ground biological treatment; soil flushing of inaccessible soils areas; GW extraction and treatment via oil/water separation followed by granulated activated carbon treatment Present Worth - ranging from $27,530,000 to $55,200,000
Warm Springs Pond OU; site contaminated with arsenic, cadmium, copper, lead, manganese, zinc, iron and sulfate
Ponds remain in place; raise and strengthen pond berms; construct new inlet and hydraulic structures; removal of tailings and contaminated soils from Mill Willow Bypass; reconstruct Mill Willow Bypass Channel; flood all dry portions of ponds; construct interception trenches to collect contaminated GW; dewater wet portions of Pond 1; monitoring and institutional controls
Butte Mine Flooding OU
SW contaminated with heavy metals
Hydroxide precipitation and aeration followed by reverse osmosis, if necessary as a polishing treatment of Horseshoe Bend water; monitoring; treatment initiation upon suspension of mining; expanded treatment as Pit System CWL is approached $41,820,000 (Disposal of treated sludge in Berkely Pit) $52,770,000 (Disposal of treated sludge in an on-site facility)
Soil, sediment, GW, SW, and leachate contaminated with VOCs and heavy metals
Consolidation; capping; institutional controls Present Worth - $1,531,500 to $2,537,800 O&M - $39,700/yr. to $43,300/yr.
1st
arsenic-rich tailings deposits, and alluvial soil, residential soil and alluvial GW contaminated with arsenic
Covering and/or removal of contaminated residential soils; use of institutional controls which would restrict access to contaminated GW and tailings.
No Action
2nd
GW contaminated with DNAPL
Installation and maintenance of source recovery system capable of removing DNAPL contamination; installation of pretreatment facility; disposal of DNAPL off-site by incineration; install double-walled pipeline to transport pretreated GW; and monitoring
4th
GW, SW contaminated with VOCs, primarily TCE
GW extraction and treatment via air stripping; discharge to POTW; SW collection and treatment via carbon adsorption; Landfill 1 capping and SVE; monitoring; institutional controls Net Present Worth - $8,600,000 O&M - $380,000/yrs. 1-5 $200,000/yrs. 6-10 $281,000/yrs. 11-29
1st
Soil COCs include arsenic, cadmium, and lead
Excavation and off-site disposal; compacted permeable cover on undeveloped residential area; institutional controls Present Worth - $2,597,000
Uranium mill tailings used as fill, backfill, sub-base, etc., contaminated with radionuclides
Stabilize and control uranium mill tailings and related contaminated material; excavation of contaminated materials and possibly demolition of sidewalks, patios, sheds, etc., and refilled with clean fill and regraded; removal to Monticello mill site and stored temporarily at East Tailings Pile
1st and 2nd
Millsite and peripheral properties contaminated with radium 226
Excavation of contaminated material; construction of repository one mile south of present millsite; cap repository; construction of surface water controls; treatment of runoff water (possibly via evaporation); long term surveillance
1st
Waste CKD
Excavation and off-site disposal
2nd
Residential soils contaminated by lead, arsenic, and cadmium
Removal and transport of soils to OU1; residential relocation; cleaning of dust from homes; trees and shrubs will be removed and replaced; institutional controls
5,6,7, and 10
OU5- soil contaminated with PCBs; OU6- radioactive waste storage area (no evidence that any uncontrolled release has occurred); OU7- soil contaminated with PCBs, polychlorinated dibenzodioxins, and polychlorinated dibenzofurans; OU10- Box Elder Wash Drum site, low concentration of pyrene and nickel
OU5- No Action; OU6- No Action; OU7- soil cover, Net Present Worth - $850,000; OU10- removal and off-site disposal of drums and stained soil, Net Present Worth - $222,000
Entire Site
Soil and GW contaminated with metals, lead, PAHs, VOCs, DNAPLs, and Pesticides
Asphalt batching w/off-site incineration of RCRA haz. soils to 10'; soil cover; GW mon.; inst. controls; SVE for NAPL Present Worth - $10,583,000 O&M - $2,836,000 for 30 yrs.
OU 5
No Action
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.