Former Wood Product Mill


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Site Location: Arlington, Washington
Contamination: Pentachlorophenol (PCP).
Geology: The subsurface at the site consists of interbedded silty sands and sandy silts to approximately 7 feet bgs. Medium to coarse sand was encountered from 7-16.5 feet bgs. Depth to GW ranged from 7.5-11 feet bgs.
Area Treated: Target treatment area was approximately 22,500 sq. feet covering the 11-17 feet bgs interval during the first event and the 7-16 feet bgs interval during event II. Approximately 140 temporary DP points were utilized to perform ISCO throughout the site.
Effectiveness:  Average PCP concentration in groundwater was reduced by 91%.

Northwest Terminal Site


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Site Location: Portland, Oregon
Contamination: Pentachlorophenol (PCP).
Geology: Upper zone is a discontinuous, unconfined aquifer compromised of fill and river alluvial deposits, consisting mainly of sand. There is seasonal variability in the upper water zone; seasonal high levels in winter and spring and low levels in the fall, about 3 feet in variation. The confining unit consists of silt to sandy silt of variable thickness, between 1-17 feet thick.
Area Treated: Target treatment area was approximately 5,600 sq. feet in the source area and 30,000 sq. feet in the downgradient plume. The target treatment interval covered the 16-19 feet bgs aquifer interval.
Effectiveness:  Average PCP concentration in groundwater was reduced by 93%.

Former Chemical and Plastics Manufacturing Facility


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Site Location: Syracuse, New York
Contamination: Ethylbenzene, xylenes and 2-ethylanthraquinone (2-EAQ).
Geology: Subsurface is compromised of fill, clay, clayey silt, silt, silty sand, and sand from surface to approximately 26 feet bgs. Depth to water is approximately 6 feet bgs.
Area Treated: Target treatment area was approximately 6,000 sq. feet targeting the 8-16 and 18-26 feet bgs aquifer intervals.
Effectiveness:  Saturated soil concentrations of xylenes, ethylbenzene and 2-EAQ were reduced by 93%, 93% and 76%, respectively.

Former Waste Pit Disposal Site


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Site Location: Western Coast of Denmark
Contamination: PCE; TCE; TPH; Benzene, Toluene and Xylenes (BTX); anilines; sulfonamides and barbiturates. Significant amount of COCs exist as DNAPLs. Average PCE soil concentration in Layer 2.1 was 3,100 mg/kg and about 280 mg/kg in Layer 2.2.
Geology: Fine sands from ground surface to 3.5 mbgs (Layer 2.1), underlain by Layer 2.2 from 3.5-15 mbgs consisting of sands and gravel. Depth to water approximately 3-4 mbgs.
Area Treated: 8m x 8m test cell area (Pit 1) consisting of Layer 2.1 (3-6 mgbs) and Layer 2.2 (6-9 mbgs).
Effectiveness:  Post treatment pilot study results indicated significant reduction in overall mass was achieved in both Layers 2.1 and 2.2.

Confidential Site


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Site Location: Northern New Jersey
Contamination: Cr (VI) levels between 240-1,770 mg/kg in site soils. Average Cr (VI) concentration in soils was estimated to be 100 mg/kg for the design of the ISCR treatment program.
Geology: Site geology consists of fill material to a depth of approximately 5-12 feet bgs consisting mostly of silty sands underlain by a 0.5-3.0 feet thick organic peat layer encountered between 6-12 feet bgs referred to as meadow mat. Depth to water is approximately 4 feet bgs. GW flow is to the west.
Area Treated: 28,000 sq. ft area from 3-12 ft bgs.
Effectiveness:  Post-treatment samples are scheduled to be collected by the client approximately three years after the ISCR injection event.

O&G Superfund Drum Reconditioning Site


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Site Location: Kingston, New Hampshire
Contamination: VOCs, primarily – BTEX, PCE, TCE, 1,1-DCA, & 1,4-Dioxane. VOC levels as high as 20,000 ug/l.
Geology: Site geology consists of fine to medium sand, some silt, and trace gravel with bedrock encountered at ~18-35 ft bgs. Depth to water is approximately 3-6 ft bgs with flow in the southeastern direction.
Area Treated: Two treatment areas; Area A (~17,400sq. ft) & Area B (~1,800 sq. ft)
Effectiveness:  No further injections are scheduled to take place at the site.