Presentation on theme: "Plaistow, New Hampshire"— Presentation transcript:
1 Plaistow, New Hampshire Beede Waste Oil sitePlaistow,New Hampshire
2 Story of the site 1926-1962 Waste oil disposal & recycling facility fuel oil, used oil, antifreeze & cold-patch asphalt batchingend of contaminated soil & waste oil deliveries1994 all business operations cease
3 The Problem800 drums, 100 above ground storage tanks & 19 underground storage tanksTotalling 3 million gallons17 piles of contaminated soilPlaistow, solely reliant upon groundwater for drinking water1983 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) & LeadDeeper soil (2ft+)VOCs, PHCs, PCBs + leadSoil pilesPCBs & several metalsGroundwater contamination extends 2000ft+, seep into nearby BrookMostly VOCs
5 Clean-up options (those not employed) Capping of soilIn-situ Redox ManipulationPermeable reactive barriersOn-site thermal desorptionAir Sparging
6 Clean-up methods employed All known containers of contaminants removed120 ft long oil interceptor trench installedContaminated soil excavated & removed for treatment/disposalDeep soil (>10 ft deep) treated with Soil Vapour Extraction
7 Soil Vapour Extraction System includesBlowerMoisture knock-out drumInter-connecting pipesBlower unit creates vacuum for systemTransmitted via pipe network to recovery pointsContamination extracted passes through moisture separation tankThen through blower, removes water vapour & particulatesVapour then discharged into atmosphere
8 Clean-up methods employed cont. Groundwater extracted from shallow aquiferExtraction system – 7 wells5 ‘near source’ to capture contaminant plumesCollected water treated to remove VOCs by Air stripping
9 Air Stripping Process of forcing air through polluted water Large tank filled with packing materialPlasticSteelCeramicsChemicals 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.
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