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2016 Design and Construction Issues at Hazardous Waste Sites
2016 Design and Construction Issues at Hazardous Waste Sites
World War II- Redstone Arsenal
War Department- Purchased property in 1941
Chemical Warfare Service (CWS)• Huntsville Arsenal (HVA)
– Chemical agent production– Test range activities
• Gulf Chemical Warfare Depot (GCWD)– Storage, Shipping and receiving
Ordnance Department (OD)• Redstone Ordnance Plant (ROP)
– Ordnance production
2016 Design and Construction Issues at Hazardous Waste Sites
Electrical Resistance Heating (ERH) Technical Overview
Thermal Oxidizerwith Scrubber
(RSA-095 West only)
100 to 600 voltsat each electrode element
2016 Design and Construction Issues at Hazardous Waste Sites
Electrodes are installed (Photo: RSA-095 West)
◄ 12.47kV electrical service is (Photo: RSA-142)
►
2016 Design and Construction Issues at Hazardous Waste Sites
The electrode field and treatment area are fenced and monitored via
cameras and motion detectors.(Photo: RSA-142)
The power control unit andtreatment system are installed (Photo: RSA-053)
►
2016 Design and Construction Issues at Hazardous Waste Sites
Cables deliver electricity from the power control unit to the electrodes. Vapors are drawn through CPVC piping to the condenser. (Photo: RSA-096)
2016 Design and Construction Issues at Hazardous Waste Sites
After the remediation effort is complete. (Photo: RSA-096)
2016 Design and Construction Issues at Hazardous Waste Sites
Remedial GoalsFor sites with potential DNAPL in the saturated zone –
Reduce groundwater contaminant concentrations by 80%
For sites with trichloroethene (TCE) in unsaturated (vadose) zone soil –
Reduce soil concentrations to less than 5 mg/kg
* DNAPL = dense non-aqueous phase liquid
2016 Design and Construction Issues at Hazardous Waste Sites
Site TargetOperation
Period
Energy to Subsurface
(kWh)
Organics Removed
(lbs)Remedial Goal Met? Cost
RSA-053 Chlorobenzene(DNAPL)
08/17/13 to 02/10/14 3,067,200 2,945 Yes1 $2.7M
RSA-096 TCE (DNAPL & vadose soil)
10/24/13 to 01/22/14 2,362,000 2,800 Yes $2.6M
RSA-142 TCE (DNAPL & vadose soil)
03/14/14 to 08/11/14 3,327,000 5,913 No2 $5.6M
RSA-095 East
TCE (DNAPL & vadose soil)
01/07/15 to04/01/15 1,088,400 1002 Yes
RSA-095West
TCE (DNAPL & vadose soil) In Progress
10,150,00 (through Aug31)
70,000 (PID)36,000 (Lab)
to date
To be determined
1Per discussion with ADEM regarding bedrock results. 2One of 33 soil locations remains above goal.
$12.1M(combined
budget)
2016 Design and Construction Issues at Hazardous Waste Sites
• Proven effective at achieving “No Further Action” for surface media
• Focuses energy in features that contain contamination
• Remediates rapidly• Minimizes land use controls• Minimizes off-site trucking• Minimizes consumed landfill space
2016 Design and Construction Issues at Hazardous Waste Sites
Factors that affect the Remediation Cost
• Type of VOC: chlorobenzene (b.p. 132°C) is about 35% more expensive than trichloroethene (b.p. 87°C).
• Percentage reduction: a 99% TCE reduction is about 13% more expensive than a 90% TCE reduction.
• Vadose or saturated zone is the same cost. Bedrock is slightly higher cost due to drilling.
• Belowgrade installation to allow vehicle traffic adds 16%.
2016 Design and Construction Issues at Hazardous Waste Sites
Design, $135,000
Installation, $864,000
Operation, $395,000
Demobilization, $64,000
GAC and Waste, $45,000
Electricity, $218,000
Soil, Air, and GW Sampling, $58,000
Oversight and Management,
$921,000
Cost by Task
2016 Design and Construction Issues at Hazardous Waste Sites
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