GW COCs include nitrates
Extraction and treatment of nitrate-cont. GW via forced evaporation to meet federal and state drinking water standard of 10 ppm; monitoring; institutional controls; capping of 10 inactive ponds; excavation and off-site removal of nitrate-cont. soils and drums of vanadium pentoxide, as well as soils cont. w/ dinitrotoluene and lead Cost - $21,110,000
Soil contaminated with VOCs primarily 1,1-dichloroethene, dichloromethane, 1,2-dichloropropane, tetrachloroethene, 1,1,1-trichloroethane, and trichloroethene; GW contaminated with VOCs and SVOCs
GW extraction and treatment via air stripping and carbon adsorption to meet MCLs (for those contaminants for which no MCLs exist, Health-Based Guidance Levels proposed by the State of Arizona will be used); construction of cap over 10 acre hazardous waste area of landfill; and soil vapor extraction at all locations where soil vapor levels exceed cleanup standards
1st
GW contaminated with various organic solvents, mostly trichloroethene
Pump wells no. 31, 71, 72, and 75 at 75% of historical capacities; air stripping of extracted groundwater to reduce levels of VOCs; treated water will be delivered to City of Scottsdale municipal water system
VOCs-in- Vadose- Zone Area
Soils above the water table contaminated with VOCs
SVE (presumptive); plug-in process will be applied on each subsite after completion of RI
1st
GW contaminated with TCD, DCE and organics
GW pump and treatment
2nd
GW contaminated with VOCs
GW pump and treat system using airstripping; liquid phase granular activated carbon, and granular activated carbon polishing on air emissions
Soil and GW contaminated with VOCs
Pump and treat GW via vacuum degasification with carbon adsorption; and soil vapor extraction;
1st
On- and off-site contamination of soil and groundwater by organic solvents
Soil-gas and groundwater recovery and treatment at an on-site facility; treated groundwater will be used in the manufacturing processes instead of potable water supplied by the City of Phoenix
2nd
GW COCs include VOCs, primarily TCE
Extraction and treatment via air stripping; off-gas treatment by synthetic resin adsorption; reinjection into aquifer Present Worth - $31,000,000
1st
Soil and GW contaminated with VOCs
Construction of clay-soil cap; construction of soil-cement levees to border Salt River
ESD
Revises cleanup level for MEK in GW from 170 ppb to 350 ppb; sets cleanup level for acetone in GW at 700 ppb; clarifies the target area for soil remedy in the northern portion of the site; revises selected remedy for an off-site agricultural well
1st
GW and soils contaminated with VOCs, benzene, xylene and chromium
Area A - Segregation of the upper and lower aquifers through extraction; treatment of groundwater using reasonably available control technology for the reduction of air emissions (may consist of vapor phase granular activated carbon); treated water will be discharged to the municipal water distribution system; Area B - Groundwater extraction/treatment using packed column aeration; groundwater monitoring for both areas
2nd
Soil and GW contaminated primarily with benzene
GW extraction and treatment via twin air stripping to meet benzene drinking water action level of 0.005mg/L; excavation and treatment of ~54,000 cys of soil via bioenhanced soil vapor extraction; and institutional controls Present Worth - $7.9 to $21.1 mil.
GW contaminated with TCE
Pump and treat GW via air stripping until drinking water standards are met; monitoring
Soil contaminated with VOCs, and DNAPLs suspected
No Further Action
1st
Soil contaminated with asbestos and nickel
Removal and consolidation of contaminated soil; removal and consolidation of waste materials; decontamination of buildings; construction of on-site underground unit to permanently bury contaminants under impermeable cap
1st
GW and soil contaminated with VOCs and metals
Excavation and off-site disposal of contaminated soil; pumping and treatment of groundwater using airstripping
GW contaminated primarily with TCE
Extraction and treatment of GW via air-stripping; application of natural biological enhancement to saturated zone to accelerate degradation of hazardous constituents
1st
Soil and GW contaminated with chromium
Paving of exposed soils; on-site treatment of contaminated soils; plume control of aquifer; electrochemical treatment of extracted GW
GW contaminated with TCE, TCA, DCE, DCA, copper, lead, and nickel
GW extraction and discharge to City of Mountain View wastewater treatment plant
ESD
Based on technical data in the adminstrative record, EPA is changing the ROD to provide that the numerical standards characterized as goals in the original ROD are final cleanup standards.
Sub
Soils and GW contaminated with 1,1,1-trichloroethane, 1,1-dichloroethene, isopropyl alcohol, xylenes, acetone, 1,1,2-trichloro-1-2,2-trifluoro- ethane (Freon-113) and tetrachloroethene
On-site soil vapor extraction; on-site shallow GW extraction and treatment with airstripping; reinjection of all on-site, and some off-site treated GW; off-site deep GW extraction and air stripping with nozzles into storm drains; discharge to surface water under NPDES permit of any treated GW remaining after reuse capacity has been exhausted
1st
Chlorinated aliphatic hydrocarbons and volatile aromatic hydrocarbons found in GW
Pump and treat GW by carbon adsorption and airstripping; discharge of treated water to Salinas River; regular monitoring
Soil and GW contaminated with VOCs
Pump and treat GW via air-stripping and carbon adsorption technolgoies; institutional controls restricting residential use of site; construct cap over excavated and unpaved portions of site; monitoring
2nd
GW COCs include VOCs
Placement of engineered cover system over landfills; institutional controls; extraction, treatment, and recharge of GW containing VOCs Present Worth - $20,200,000
Source Control
Soil contaminated with VOCs
Capping; synthetic membrane; on-site landfill gas flare; monitoring Present Worth - $23,195,000 O&M - $5,279,000
Soil and GW contaminated with VOCs
Soil in-situ SVE; soil aeration and sparging; GW extraction and treatment via POTW; Inst. controls; monitoring
1st
GW contaminated with VOCs
Onsite soil vapor extraction; onsite shallow and deep groundwater extraction and treatment with airstripping; offsite deep groundwater extraction and air stripping with nozzles into storm drains; onsite recharge of treated groundwater to maximum extent feasible; discharge to surface water under NPDES permit of any treated groundwater remaining after reuse capacity exhausted
GW contaminated with TCE
Pump and treat GW via existing granular activated carbon adsorption system until drinking water standards are met
Soil and GW contaminated with 1,1-DCE, TCE, PCE, 1,1,1-TCA, freon 113, and toluene
Soil excavation and disposal in compliance with RCRA land disposal restrictions; GW pump and treat via air stripping
Soils contaminated with heavy metals
Acid mine drainage flows treatment via chemical neutralization/precipitation; maintenance of Richmond and Lawson adits to allow the mine workings to continue to function as effective collectors of acid mine drainage;
3 (Old/No. 8 Mine Seep)
GW contaminated with metals
GW chemical neutralization/ precipitation, using lime high density sludge; discharge GW to creeks; discharge resid. on site Present Worth - $8,300,000 O&M - $3,920,000
Soil and GW contaminated with arsenic, PAHs, pentachlorophenol, and dioxins
Extraction of GW, treatment, and reinjection; excavation of soils, followed by chemical treatment and on-site disposal
JM Mill OU; mine waste and mill tailings contain high concentrations of asbestos
Construction of cross canyon stream diversion; improvement of existing sediment trapping dam; fencing around the mine perimeter; revegetation pilot project; dismantling of the mill building; road paving; and filing deed restrictions
1st
Pentachlorophenol and creosote detected in soil; pentachlorophenol detected in GW
In situ biodegradation of contaminated soil; excavation and treatment by soil washing; installation of low permeability cap; extraction of contaminated GW; treatment using activated carbon and reinjection
GW contaminated with VOCs and fuel hydrocarbons
Extraction and treatment of GW via ultraviolet/oxidation-based remediation technology, as well as air stripping where deemed necessary
ESD
Change to granular activated carbon for treatment of vapor at treatment facility F Cost - $247,000
Final
Soil, sediment, and GW contaminated with PAHs, VOCs, and metals
Institutional controls, grading, seeding, sediment removal, GW monitoring Present Worth - $600,000 O&M - $1,000,000
1st
GW and soil contaminated with metals, organics and PCBs
Construction/operation of both groundwater extraction and treatment systems; disposal of treated groundwater to a storm sewer
Soil contaminated with VOCs, metals, PCBs, and pesticides
Hybrid closure cap, with in-situ SVE; institutional controls; and monitoring Present Worth - $1,970,000 O&M - $63,000/yr.
Soil, GW contain high concentrations of PCP
Deed restrictions on residential use; site access restrictions; fencing the perimeter of the L-P plant; well permit restrictions; and monitoring of on-site wells
Source OU
Soils contaminated with VOCs and metals
Soft material solidification in-situ solidification of soils; install slurry walls; capping of sumps; O&M Present Worth - $78,620,000 for 30 yr. design O&M - $828,000/yr.
1st
Soils contaminated with PCBs and VOCs; GW contaminated with chlorinated VOCs and benzene
Excavation of PCB-contaminated soils above 10 mg/kg and disposal off-site at a TSCA landfill; dewatering of soil excavated below five feet using a mobile water treatment system to remove PCBs; soil replacement, regrading, compaction and revegetation; remove VOC-contaminated soil and dispose of in accordance with RCRA; analyze VOC-contaminated soil to find source of VOC spill; further investigation of groundwater contaminated with VOCs and restoration of the groundwater up to site boundary; discharge of treated groundwater to a POTW; install additional down-gradient wells to evaluate extent of VOC contamination; confirmation sampling of groundwater; develop additional remedial measures if evaluation warrants; dismantling of the MGM Brakes process building
GW contaminated with VOCs
GW extraction and treatment via GAC or air stripping; discharge to POTW; O&M Present Worth - $49,900,000
1st
Leachate contamination in GW
GW pump and treatment; gas control systems
2nd
Leachate contaminated with VOCs and organics
Onsite treatment of leachate and other collected hazardous liquids using air stripping and carbon adsorption with discharge to the sewer system; construction of a treatment facility
3rd
Air and soil contaminated by landfill gas (LFG)
Installation of: 58 new perimeter LFG extraction wells, 48 pile driven wells on the top deck of the landfill to remove LFG, 50 shallow and 12 deep slope wells to reduce surface emissions of LFG, new integrated perimeter and interior LFG headers, 58 multiple completion monitoring wells at the property boundary; installation of: LFG destruction facilities, automated gas control system, abovegrade condensate sumps to collect condensate from gas headers, leachate pumps in gas wells to de-water saturated zones, and abovegrade leachate sumps; utilizing functional existing gas extraction wells and gas monitoring probes
LFG migration
Landfill cover to reduce emissions and odors, prevent oxygen intrusion, prevent surface water infiltration, provide erosion control; landfill gas extraction wells; and upgraded thermal destruction facility for LFG
1st
GW contaminated with VOCs, iron, and manganese
Extraction of contaminated GW; treatment using greensand and airstripping; reinjection into aquifer; disposal in the North Central Canal or disposal in local infiltration basins
2nd
Multi layer cap; SVE to water table; enclose canal
Burn Pit contaminated primarily with arsenic cadmium, chromium, lead TCE, PCE, and 1,2-DCE
Ventilation of entire Burn Pits OU to remove VOCs via extraction wells and vacuum pump/rotary blower; treatment of extracted vapor via carbon adsorption; sampling; stabilization of excavated soils via cement-silica mixture; and institutional controls Present Worth - $2,811,000
1st
GW contamination; TCE; PCE
GW pump and treatment
1st
GW contaminated with VOCs
Extraction of GW and installation of vapor phase GAC adsorption units to control VOC air emissions if air stripping technology is used; installation of monitoring wells to place on the border of the contaminant plume to monitor the extraction reliability of the system; treatment of contaminated water at the effluent discharge point to contaminant concentrations below MCLs and SALs; use of the treated GW as a public water supply
2 (Glendale South OU)
GW contaminated with VOCs and SVOCs
Extraction and treatment of GW via air stripping or vapor-phase GAC; blending for nitrate; public water supply Present Worth - $22,420,000 to $25,020,000 O&M - $1,613,000 to $1,852,000
3 (Glendale North OU)
GW contaminated with VOCs and SVOCs
Extraction and treatment of GW via air stripping or liquid-phase GAC; blending; convey to POTW Present Worth - $36,400,000 O&M - $3,240,000/yr.
Sub
Contaminated GW
Alternate water supply
2nd
GW contaminated with VOCs
Extraction of groundwater from the existing wells and if feasible, modification of the existing wells and/or installation of new production wells to selectively extract groundwater from the most highly contaminated zones of the underlying aquifer
Whittier Narrows contaminated with VOCs
No Action; monitoring only
4 Amendment
GW contaminated with VOCs
Delays building of treatment system for 5 yrs.; sets drinking water standard at 5 ppb for PCE Present Worth - $24,662,000
Baldwin Park OU
GW COCs include VOCs
GW extraction and treatment Capital Costs - $47, 100,000 O&M - $4,200,000/yr.
1st
GW and soils contaminated with chromium and organics
Extraction of groundwater and treatment using precipitation, coagulation, and flocculation processes to remove chromium; disposal of treated and tested groundwater by reinjection into the aquifer or off-site disposal; groundwater monitoring; excavation of contaminated soils exceeding cleanup goals and mixing soils with a fixative agent to solidify and stabilize contaminated soil; replacement of fixed soil into excavated areas and covering with a RCRA cap; long-term monitoring; long-term access and land use restrictions and short-term institutional controls to prevent use of contaminated groundwater
1
GW contaminated with VOCs, metals, and pesticides
GW extraction and treatment via air stripping, gas phase carbon adsorber; SW discharge, reuse and evaporation pond Present Worth - $4,147,000 O&M - $2,140,000
GW contaminated with VOCs
GW monitoring to demonstrate capture of contaminant plume; and construct two additional extraction wells
1st
Ring levee contaminated by asbestos
Stripping and rough grading the existing levee, placing a minimum of 12 inches of compacted soil over the levee; placing 6 inches of topsoil over the compacted soil; implementing all necessary environmental mitigation required under Section 404 of the Clean Water Act for impacts of the soil cover on wetlands and endangered species habitat; deed restrictions
1st
Site contaminated with asbestos waste debris; industrial yards contaminated with asbestos
Paving contaminated truck and industrial yards with resurfacing material; wet sweeping of street dust; removal of asbestos waste debris
Soil COCs include pentachlorophenol, benzopyrene, and dioxin
Capping and in-situ bioremediation; institutional controls; monitoring; GW extraction and physical/chemical treatment w/recharge Present Worth for Soils - $7,300,000 Present Worth for GW - $37,900,000
Sub
GW contaminated with organics, TCE, CBSA, spent solvents and heavy metals
GW pump and treatment
4th
GW contaminated with soluble organics and inorganics
Dewatering of original disposal area; installation of GW extraction system
GW contaminated with VOCs
GW extraction and treatment via air-stripping, and discharging treated effluent to storm drain
Soil and GW contaminated with TCE
Soil vapor extraction
1
GW contaminated with VOCs, inorganics, and pesticides
GW extraction and treatment via air stripping, vapor phase carbon; disposal via return to aquifer Present Worth - $9,512,500 O&M - $285,200/yr. for 30 yrs.
Soil and GW contaminated with arsenic and chromium
GW extraction and treatment via electrochemical treatment, and activated alumina adsorption; excavate soils followed by chemical fixation
Final
GW contaminated with TCE
Capture and extract GW by use of extraction wells; treat GW through existing granular activated carbon adsorption system
1st
GW contaminated with methane, metals, phenol and vinyl chloride
No action (no imminent and substantial endangerment to human health or the environment; continued monitoring; enforcement under the Clean Water Act)
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.