1. Plaistow, New Hampshire
Beede Waste Oil site
Plaistow,
New Hampshire

2. Story of the site 1926-1962 Waste oil disposal & recycling facility
fuel oil, used oil, antifreeze & cold-patch asphalt batching
end of contaminated soil & waste oil deliveries
1994 all business operations cease

3. The Problem
800 drums, 100 above ground storage tanks & 19 underground storage tanks
Totalling 3 million gallons
17 piles of contaminated soil
Plaistow, solely reliant upon groundwater for drinking water
1983 chemical contamination discovered near the site

4. The Problem cont. Shallow soil (0-2ft) Deeper soil (2ft+) Soil piles
Polychlorinated biphenyls (PCBs), Petroleum hydrocarbons (PHCs) & Lead
Deeper soil (2ft+)
VOCs, PHCs, PCBs + lead
Soil piles
PCBs & several metals
Groundwater contamination extends 2000ft+, seep into nearby Brook
Mostly VOCs

5. Clean-up options (those not employed)
Capping of soil
In-situ Redox Manipulation
Permeable reactive barriers
On-site thermal desorption
Air Sparging

6. Clean-up methods employed
All known containers of contaminants removed
120 ft long oil interceptor trench installed
Contaminated soil excavated & removed for treatment/disposal
Deep soil (>10 ft deep) treated with Soil Vapour Extraction

7. Soil Vapour Extraction
System includes
Blower
Moisture knock-out drum
Inter-connecting pipes
Blower unit creates vacuum for system
Transmitted via pipe network to recovery points
Contamination extracted passes through moisture separation tank
Then through blower, removes water vapour & particulates
Vapour then discharged into atmosphere

8. Clean-up methods employed cont.
Groundwater extracted from shallow aquifer
Extraction system – 7 wells
5 ‘near source’ to capture contaminant plumes
Collected water treated to remove VOCs by Air stripping

9. Air Stripping Process of forcing air through polluted water
Large tank filled with packing material
Plastic
Steel
Ceramics
Chemicals evaporate & are collected at top of tank

10. Treatment continues…
Proposed and currently ongoing clean-up processes will take in the region of 15 years to meet on-site clean-up targets.
5 years before goals for groundwater in the vicinity of residential areas will be met.