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)

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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)

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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