SLIDE 1
Introduction
- Military training ranges under scrutiny
– Potential impacts to ecology and environment – Complex issues and problems
- Major ranges receiving attention
DISTRIBUTION AND FATE OF ENERGETICS AT THE MMR IMPACT AREA AND - - PowerPoint PPT Presentation
DISTRIBUTION AND FATE OF ENERGETICS AT THE MMR IMPACT AREA AND - - PowerPoint PPT Presentation
DISTRIBUTION AND FATE OF ENERGETICS AT THE MMR IMPACT AREA AND TRAINING RANGES Jay Clausen Senior Hydrogeologist/ Geochemist (AMEC) Marc Grant (AMEC) Ben Gregson (IAGWSP) Presented at SERDP and ESTCP Symposium. November 27-29, 2001.
SLIDE 2
SLIDE 3
Camp Edwards - Site History
- Training and Impact Areas used since 1911
- Designed to house 30,000 troops during
WWII
- USEPA banned training
in 1997 through an administrative order
SLIDE 4
Site Lithology
Legend
VC Sand & Gravel F Sand & Silt Till Bedrock Water Table Well Screen
ELEVATION IN FEET (MSL)
- 100
- 50
50 100 150 200
Sea Level
Aquifer Unsaturated Zone
SLIDE 5
Hydrogeologic Model
- Groundwater flow is
radial with the mound to the southeast of the Impact Area in the J Range Area
- Groundwater flow is
approximately one foot per day
SLIDE 6
Areas of Investigation
SLIDE 7
Surface Soil Findings
TNT 6.3% RDX 37.0% HMX 20.3% 2,4-DNT 1.3% aDNTs 32.3% Other 2.7%
SLIDE 8
Soil Results (explosives)
SLIDE 9
Soil Results at Artillery Target 42
SLIDE 10
Groundwater Findings (explosives)
RDX 65.7% HMX 21.9% aDNTs 12.4%
SLIDE 11
Plan View of RDX Detections in the Impact Area
SLIDE 12
Inner Groundwater Transect within the Impact Area
210 160 110 60 10
- 40
- 90
SLIDE 13
Longitudinal Cross-Section through the Impact Area
210 160 110 60 10
- 40
- 90
SLIDE 14
Location of Perchlorate In Groundwater at MMR
SLIDE 15
Potential Source Area
- High-order
detonations
- Low-order
detonations
- UXO
- EOD activities
at the J Range
- Disposal/Burial
sites
- Washout
SLIDE 16
Explosive Fate-and-Transport Conceptual Model
- Deposition of particulates to ground surface
- Slow dissolution of particulates
- Rapid movement of dissolved explosives through
unsaturated zone, leaving little residual contamination (RDX and HMX)
- Introduction to groundwater results in rapid transport
away from source
SLIDE 17
Conclusions
- RDX and HMX present in surface soil adjacent to
artillery and mortar targets
- RDX and HMX present in groundwater downgradient
- f primary target area (i.e. Tank Alley) within the
Impact Area
- TNT which is a component of the munitions appears
to be degraded before reaching groundwater
SLIDE 18
Conclusions (cont.)
- Training using HE artillery and mortar rounds (UXO,
detonation, or both) appears to have resulted in an explosive impact to groundwater at MMR
- Some metals, PAHs, and pesticides/herbicides present
in surface soil but no evidence of impacts to groundwater
- PCNs may be an issue for soil and perchlorate may be
an issue for groundwater
- MMR findings are potentially applicable to other bombing
ranges and battlefields
SLIDE 19
Lessons Learned
- Compositing explosive soil samples is necessary
- Modifications to explosive analytical methods may be
needed – expanded analyte list – changes to sample preparation – lower detection limits
- Perchlorate (OB/OD) and PCNs for ranges may be
issues
- Maintain strong technical focus
- OB/OD is worse case (concentration)