col roger a. wilson, jr. -...

COL Roger A. Wilson, Jr. - CommanderCOL Roger A. Wilson, Jr. - Commander

Former Nebraska Ordnance Plant, Mead NEFormer Nebraska Ordnance Plant, Mead NE

Information Briefing for:

Big Sandy Lake Homeowners Assoc.

March, 30 2009

Briefing Prepared by USACE – Kansas City District

Building StrongBuilding StrongFormer Nebraska Ordnance Plant, Mead NE slide # 2

AgendaAgenda• Opening Remarks• History of NOP• Investigations and Record of Decision• Current and Future State of the Remedy

Former Nebraska Ordnance Plant, Mead NE slide # 3

History of NOPHistory of NOP• 1942 to 1945 - Operating period in support of WW II• 1945 - NOP placed on inactive status• 1946 to 1949 - Explosive storage without production• 1952 - NOP reactivated for Korean Conflict• 1956 - NOP placed on standby status• 1959 - NOP declared excess, transferred to the GSA• 1960 - USAF constructs Atlas Missile Launch Facility

(Atlas Missile Area) at NOP• 1962 – U. of Nebraska purchases 9,600 acres of NOP• 1964 - Atlas Missile Area abandoned


History of NOPHistory of NOP• Construction of the NOP began in early 1942 and

took approximately 9 months. NOP Site occupied approximately 17,250 acres.

• The National Defense Corporation operated the plant from 1942 to 1945 in support of World War II mission. In 1945, World War II operations were terminated and the NOP was placed on inactive status.


History of NOPHistory of NOP• Load and Pack Facility: Bombs, shells and rockets

were assembled at four individual bomb load lines.

• Other facilities on-site included a proving range, a landfill, a wastewater treatment plant, analytical laboratories and storage and administration facilities.


History of NOPHistory of NOP• During the 1950’s and early 1960’s, the US Air

Force operated an Atlas Missile Launch facility. The Atlas Missile Area was abandoned in 1964.

• In 1962, the University of Nebraska purchased approximately 9,500 acres of the Former NOP site for their agricultural research and development site.

• The remaining land from the Former NOP was purchased by private individuals and light industry.


Former Nebraska Ordnance Plant, Mead NE Briefing for COL Pease, OACSIM – 3 MAR 2009 slide # 9


Worst job at NOP?

Investigations & RODInvestigations & ROD• 1983 - Archive Records Search, USATHAMA (now AEC)• 1989 - Initial investigation by USACE• 1990 - NOP added to National Priorities List• 1990 to 1992 – Remedial Investigation and supplemental

investigation efforts for soil & groundwater• 1992 - Interagency Agreement (now Federal Facilities

Agreement) signed• 1995 – Operable Unit 1 (OU1) Record of Decision signed• 1996 - Initiation of the Restoration Advisory Board• 1997 - OU2 Record of Decision signed


Current State of the RemedyCurrent State of the RemedyOU1 Record of Decision– Excavate explosives contaminated soil – 17,000 yd3

– Incinerate on-site & backfill (controversial with the RAB, at the time)

• 1995 – OU1 Remedial Action start• 1997 – OU1 Remedial Action complete

OU1 Present Status = Remedy Complete (i.e. closed-out)


Current State of the RemedyCurrent State of the RemedyOU2 – Site-Wide Groundwater

• 1997 Record of Decision


Contaminants of Concern (CoCs)

Groundwater Clean-Up Goals (ug/L = ppb)

Methylene Chloride 51,2-Dichloropropane 5

TCETCE 55TNB 0.778TNT 2

2,4-DNT 1.24RDXRDX 22

TCE and RDX TCE and RDX are the most are the most widespread widespread contaminantscontaminants

Current State of the RemedyCurrent State of the RemedyOU2 – Site-Wide Groundwater • 1997 Record of Decision (ROD) calls for

– Hydraulically contain contaminated groundwater– Focused extraction in areas with relatively high

concentrations of trichloroethene (TCE) and explosives.– Treat all extracted groundwater– Dispose of the treated groundwater by beneficially

reusing it or through surface discharge.– Provide a potable water supply to users whose water

supply contains RDX or TCE


Current State of the RemedyCurrent State of the RemedyOU2 – Site-Wide Groundwater• 1997 - 2 extraction wells and Main Groundwater Treatment

Plant construction start, under Removal Action (allows for start before Final Remedial Design complete)

• 1999 - Final Remedial Design complete• 1999 - Remedial Action start (additional extraction wells

and expansion to Main Treatment Plant)• 2003 - Additional investigation in LL1 (due to unexpected

high concentrations in EW-11)• 2005 - LL1 Treatment Plant Design completed• 2006 - LL1 Treatment Plant operational


Current State of the RemedyCurrent State of the RemedyOU2 – Site-Wide Groundwater• 2007 – Containment Evaluation for CY2006 indicates future

loss of containment – call for new EWs 14 & 16

• 2007 – Design for AOP Treatment Plant complete

• 2008 – AOP Treatment Plant construction complete

• 2008 – Design for new extraction wells EW14 & 16

• 2008 – Design for new focused extraction well EW-15

• 2009 – EW 14, 15, 16 installation complete

• 2010 – LL4 Treatment Plant construction complete


Current State of the RemedyCurrent State of the RemedyOperable Unit 3

– Control and remediation of an onsite landfill and other disposal areas not identified at the signing of the IAG.

Military Munitions Response Program – Currently under recurring reviews (every five

years) and in the process of determining path to achieve a no further action decision document.


10975 EL MONTE, SUITE 100OVERLAND PARK, KANSAS 66211

N


1997 SITE MAP1997 SITE MAP


2008 SITE MAP 2008 SITE MAP

Current State of the RemedyCurrent State of the RemedyOU2 – Site-Wide Groundwater• Current Operations – 5.5 MGD


Main Treatment Plant- EWs #1 to 10*- 2400 gpm (3.4 MGD)- EWs 2, 5 & 8currently off-line

- Activated Carbon- Beneficial Re-Use oftreated water

LL1 Treatment Plant- EWs #12 & 13*- 600 gpm (0.86 MGD)- EW-13 currentlyoff-line

- Air Stripper

AOP Treatment Plant- EW-11- 550 gpm (0.79 MGD)- Advanced OxidationProcess (hydrogenperoxide & ozone)

- Treated water goes toMain Treatment Plantfor polishing

gpm = gallons per minute

MGD = Million Gallons per Day

Current State of the RemedyCurrent State of the RemedyOU2 – Site-Wide Groundwater• Annual Groundwater Monitoring Program (GMP)

– Sampling program reviewed each year

– Document compliance and successful containment

– Includes surface water monitoring



234 Monitoring Wells234 Monitoring Wells


24 Surface Water Locations24 Surface Water Locations


• Alternate Water Supply (see Site Map)

– 5 residences currently receive bottled water and activated carbon treatment

– Every residence within 0 to ½ mile sampled 2x per year

– Every residence within ½ to 1 mile sampled 1x per year

– Buffer Zone sampling began 2004

– To date, no exceedences found



67 Private Water Supply Wells67 Private Water Supply Wells


• Investigations subsequent to the ROD– Periodic need for focused investigations

– To confirm extent of contamination and plume dimensions

– TRIAD approach – dynamic sampling plan and field based testing



2001 to 2007 2001 to 2007 -- TCETCE


2001 to 2007 2001 to 2007 -- RDXRDX

Current State of the RemedyCurrent State of the RemedyOU2 – Site-Wide Groundwater• Hydraulic Containment

– Annual Containment Evaluation report – prior year data

– Based on chemical and hydraulic data

– Uses groundwater model to predict performance

–– 2006 Containment Evaluation Report 2006 Containment Evaluation Report –– indicated indicated gaps and possible future loss of containmentgaps and possible future loss of containment



-- 20062006

Current State of the RemedyCurrent State of the RemedyOU2 – Site-Wide Groundwater• Hydraulic Containment

– Corrective Actions• Design new extraction wells – EWs-14 & 16 to fill the gap

• Further investigate east side

• Further investigate west side – LL1

– Results• Eastern side found to be containment (better understanding of

groundwater/surface water interactions)

• West side found to be in containment (contamination not found)



20072007

Current State of the RemedyCurrent State of the RemedyOU2 – Site-Wide Groundwater• Source Zone Treatment & Reduced Restoration Time

– Estimates show majority of plume(s) being remediated within 30-40 years

– Areas of high concentration still remain

– Possible DNAPL – potential subject of future investigation


Current State of the RemedyCurrent State of the RemedyOU2 – Site-Wide Groundwater• Source Zone Treatment & Reduced Restoration Time

– 1 new focused extraction well (EW-15) being installed right now

– Cost To Complete (CTC) includes 4 additional focused extraction wells (actual locations to be based on modeling)

– PDT (USACE and EPA) currently exploring other possible technologies (in-situ) besides additional extraction

– Actively looking for ways to reduce overall CTCFormer Nebraska Ordnance Plant, Mead NE slide # 44

col roger a. wilson, jr. -...

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