CARBON TETRACHLORIDE

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Department of Defense Facility

ISOTEC CASE STUDY 14

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Site Location: Eastern PA
Contamination: Carbon Tetrachloride (1500 ppb); and Chloroform (190 ppb) in groundwater.
Geology: Sandy silt with some gravel to a depth of about 6 ft; below this it changes mostly to silt with some sand underlain by weathered bedrock. The water table is approximately 6-7 ft bgs.
Area Treated: ~5,650 Sq. ft area at 5-20 ft bgs vertical depth interval.
Effectiveness:  Site-wide Carbon Tetrachloride reduced by 86% and Chloroform by 76%.

Active Military Base

ISOTEC CASE STUDY 38

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Site Location: East Coast, United States
Contamination: Carbon Tetrachloride (500 µg/l ); and Chloroform (18 µg/l) in groundwater.
Geology: Fine to medium silty and clayey sand matrix underlain by a sandy clay semi-confining unit at 35 feet bgs. Average hydraulic conductivity was 1.00 x 10 -4 cm/sec. The water table is approximately 4.5-12 ft bgs.
Area Treated: ~9,000 Sq. ft area at 20-35 ft bgs vertical depth interval.
Effectiveness:  Treatment program results indicated an overall VOC destruction of 87% in the treatment area with chloroform being treated to ND values.

Truck Maintenance Facility

ISOTEC CASE STUDY 39

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Site Location: Edison, New Jersey
Contamination: Carbon Tetrachloride, Chloroform, TCE, PCE, Vinyl Chloride, and 1,1-DCE.
Geology: Site is underlain by shale of the Passaic formation. Competent bedrock is overlain by up to 10 feet of unconsolidated materials consisting of in-place weathered bedrock, silt and clay, as well as some reworked local soil. The water table is approximately 6 ft bgs.
Area Treated: Target treatment area is approximately 415 ft x 275 ft. The target vertical treatment zone covered the 10-100 feet bgs depth interval. Injection well clusters were installed and two depth intervals (10-50 feet bgs and 60-100 feet bgs) were targeted.
Effectiveness:  Average VOC results for all 22 wells sampled show an overall 52% reduction following the last application. Additional treatments have been approved by the client and are pending regulatory approval.