This project falls under the authority of the Defense Environmental Restoration Program for Formerly Used Defense Sites (DERP-FUDS) statute [10 USC 2701 (a)(2)] which requires that projects addressing hazardous substances, pollutants, and contaminants be conducted consistent with the Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA).

Environmental Cleanup Process under CERCLA Project stage in CERCLA process

Preliminary Assessment

Site Inspection

Remedial Investigation/ Feasibility Study

Remedial Design

Remedial Action

Post Remedial

Action

No Further Action

Public

Involvement

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• Lincoln Atlas Site 10 is located in York County, ½ mile north of

Highway 34 and 5 miles west of York, Nebraska. It is a former Atlas F missile facility used by the former Lincoln Air Force Base.

• Construction of the 6.38-acre site (including Launch Facility and

Launch Control Center) was completed in 1961. This construction was a national defense effort to store, maintain and potentially launch an Atlas Intercontinental Ballistic Missile (ICBM).

• Acquired between March 1962 and March 1964. • Excessed to the General Services Administration (GSA) in

August 1965. • Deactivation and conveyance to private individuals in 1965. • The site is privately owned.

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Former AtlasMissile Site 10

1994 Site Inspection-Phase 1 Result: Traces of solvents were found in two soil locations and a trace of dissolved metals was found in the holding pond. 1998 Site Inspection – Phase 2 Result: Minor soil contamination was found. Groundwater was found to be contaminated with trichloroethene (TCE) at 99 micrograms per liter (μg/L) which is above the drinking water Maximum Contaminant Level (MCL) of 5 μg/L. 2002 Remedial Investigation/Feasibility Study Report Result: Identified a groundwater TCE plume originating at the missile silo and extending southeast to Road I. Provided and reviewed potential cleanup technologies. 2005 Supplemental Remedial Investigation/Feasibility Study Report Result: Provided additional groundwater information and results of a Hydrogen Release Compound (HRC) pilot study. A groundwater TCE concentration was reported as high as 1,440 μg/L. 2005 Contract to KEMRON Environmental Services Result: Contract awarded to KEMRON Environmental Services to cleanup soil and groundwater contamination. 2006 Revised Supplemental Remedial Investigation/Feasibility Study Result: KEMRON provided additional soil and groundwater sample results indicating the groundwater TCE plume extended to the southeast near the city of York. 1998 – 2008 Residential Well Monitoring Result: The Corps collects water samples from residential water wells.

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KEMRON Environmental Services designed a cleanup strategy for: • Trichloroethene (TCE) in soil above the water table at the missile

site near the missile silo. • TCE in the groundwater at the missile site and the plume

extending to the southeast toward the city of York.

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SSooiill TTCCEE CClleeaannuupp Soil Cleanup Objective: Remove trichloroethene (TCE) from soils to eliminate a continuing TCE source to groundwater. Design: Construct a Soil Vapor Extraction System (SVE) to remove TCE vapors and clean soils. • Install 39 SVE wells in contaminated soil areas around the missile silo to

collect TCE vapors. • Construct an SVE facility with blowers connected to the wells to create a

vacuum in the ground and remove TCE vapor. • Monitor the vapor for TCE to determine when the soils are clean. • The system is expected to operate until clean-up is approved by the

Nebraska Department of Environmental Quality.

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GGrroouunnddwwaatteerr TTCCEE CClleeaannuupp Groundwater Cleanup Objective: Cleanup trichloroethene (TCE) in groundwater at the site and along the TCE plume moving to the southeast. Design: Construct 3 Groundwater Treatment Systems (GWTS) to extract TCE-contaminated groundwater from the aquifer, remove the TCE at an above ground treatment plant and inject the clean water back into the aquifer. • Each well pumps approximately 30 gallons per minute (gpm). • Each groundwater treatment system cleans 90 to 150 gpm. • TCE is removed by air strippers from the water and discharged to the air. • All cleaned water is re-injected back to the aquifer. • TCE discharged to the air is within the limits allowed by Nebraska

regulations.

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Typical Groundwater Extraction Well

Typical Groundwater Injection Well

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GROUNDWATER TREATMENT SYSTEM #1: One treatment system is built near the missile site to treat the source area for trichloroethene (TCE) in groundwater. The system includes: • 3 groundwater extraction wells with submersible pumps. • 1 treatment plant to clean and pump the water. • 3 injection wells to deliver clean water back into the aquifer. • Groundwater monitoring to determine when TCE concentrations meet the

Nebraska cleanup requirement of 5 micrograms per liter (μg/L).

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GGrroouunnddwwaatteerr TTCCEE CClleeaannuupp

GROUNDWATER TREATMENT SYSTEM #2: One treatment system is built between Road I and Road J to treat the area of the plume southeast of the site with high trichloroethene (TCE) concentrations in the groundwater. The system includes: • 5 groundwater extraction wells with submersible pumps • 1 treatment plant to clean and pump the water • 3 injection wells to deliver clean water back into the aquifer • Groundwater monitoring to determine when TCE concentrations meet the

Nebraska cleanup requirement of 5 micrograms per liter (μg/L).

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GROUNDWATER TREATMENT SYSTEM #3: One treatment system is built at Road L to treat the down gradient trichloroethene (TCE) concentration plume in groundwater and prevent future plume movement to the southeast. The system includes: • 5 groundwater extraction wells with submersible pumps • 1 treatment plant to clean and pump the water • 3 injection wells to deliver clean water back into the aquifer • Groundwater monitoring to determine when TCE concentrations meet the

Nebraska cleanup requirement of 5 micrograms per liter (μg/L).

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