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Former Dry Cleaner

ISOTEC CASE STUDY 16

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Site Location: South Florida
Contamination: Trichloroethene (14,555 ppb); Tetrachloroethene (26,598 ppb); Vinyl Chloride (18,112 ppb); and Cis-1,2-dichloroethene (283,219 ppb).
Geology: Medium grain quartz sand with silty soil & limestone fragments to 42 feet bgs; indurated carbonate sandstone & limestone to 83' bgs; water table at 6 ft bgs.
Area Treated: ~24,000 Sq. ft area at 5-40 ft bgs vertical depth interval.
Effectiveness:  Total VOC's reduced by 87% from 346,204 ppb to 41,976 ppb.

Operational Dry Cleaner

ISOTEC CASE STUDY 18

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Site Location: NE Florida
Contamination: Trichloroethene (200 ppb); Tetrachloroethene (54 ppb); and Trans 1,2-Dichloroethene (42 ppb) in groundwater.
Geology: Undifferentiated sediments consisting of sand and shell with some clay and clay-rich layers; water table is at approximately 8-10 ft bgs.
Area Treated: 8,500 Sq. ft area at 5-40 ft bgs vertical depth interval.
Effectiveness:  All contaminants were treated to below applicable FDEP groundwater quality criteria (MCLs) throughout the site following ISOTEC pilot and full-scale treatment programs. A "Site Rehabilitation Completion Order" was issued.

Former Dry Cleaner

ISOTEC CASE STUDY 25

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Site Location: NE Florida
Contamination: Trichloroethene (350 ppb); Tetrachloroethene (48 ppb); Vinyl Chloride (38 ppb); Cis-1,2 Dichloroethene (2,901 ppb);and Trans-1,2-Dichloroethene (146 ppb).
Geology: General shallow subsurface conditions at the site consist of very fine sands; water table at approximately 3 feet bgs.
Area Treated: 11,250 square feet at 3 to 20 feet bgs vertical depth interval.
Effectiveness:  90% reduction of total VOCs site wide. All concentrations reduced to below the FDEP natural attenuation default concentrations.

Active Dry Cleaner

ISOTEC CASE STUDY 26

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Site Location: Atlanta, GA
Contamination: Average Concentrations: Trichloroethene (117 ug/l); Tetrachloroethene (1,444 ug/l); and Cis-1,2-Dichloroethene (100 ug/l).
Geology: Sands in the vadose and the saturated zones and fractured rock in the deeper zone. Depth to groundwater is ~18 ft bgs; hydraulic conductivity is 5.9 ft/day.
Area Treated: ~8,000 Sq. ft total area. Target treatment zone ranged from ~2-18 ft bgs (unsaturated zone), ~18-55 ft bgs (saturated zone), and up to 80 ft bgs (fractured rock).
Effectiveness:  GW: 83% reduction of total VOCs site-wide after 1st treatment event, which improved to 89% reduction (except MW-29) after 2nd treatment event. Soil: Treated to ND concentrations.

Former Dry Cleaner

ISOTEC CASE STUDY 42

Site Location: Denver, Colorado
Contamination: PCE (3,267 µg/L) and TCE (1,542 µg/L).
Geology: Approximately 3 feet of permeable sand and gravel situated on top of siltstone bedrock and overlain by clay. Siltstone at 10-15 feet bgs. Clay at 0-9 feet bgs. The groundwater at the site appears to be confined to the permeable zone overlying the siltstone.
Area Treated: Phase I treatment targeted the source area (15-foot spacing) while Phase II treatments targeted the entire plume (30-foot spacing).
Effectiveness:  Following quarterly sampling events conducted over a 1-year time frame, both PCE and TCE were reduced by greater than 99%.