METALS TREATMENT

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Confidential Site

ISOTEC CASE STUDY 60

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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.

Confidential Site

ISOTEC CASE STUDY 69

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Site Location: New Jersey
Contamination: Cr (VI); levels as high as 80 mg/kg
Geology: Fill material to a depth of approximately 15-17 ft bgs consisting of silty sands underlain by 0.5-3.0 feet thick organic peat layer. Depth to groundwater approximately 5 ft bgs.
Area Treated: Two AOC’s treated with Calcium Polysulfide Solution (CAPS). Area 1: ~560 sq ft, targeting the 2-4 and 16-18 ft bgs aquifer intervals. Area 2: ~380 sq ft targeting the 10-12 and 18-20 ft bgs aquifer intervals.
Effectiveness:  Long term monitoring program in place by client.