RESIDENTIAL PROPERTIES

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Lakefront Residence

ISOTEC CASE STUDY 8

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Site Location: Sussex County, NJ
Contamination: Fuel Oil #2, TPH approximately 12,000 to 20,000 ppm in soil.
Geology: Fractured bedrock formation at 4 ft bgs containing perched water table.
Area Treated: ~1,800 sq. ft at a vertical interval of 2-12 ft bgs.
Effectiveness:  Site-wide TPH was reduced by 82% with 96% in hot spot area. The property received a "No Further Action letter."

Residential Lakefront Property

ISOTEC CASE STUDY 56

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Site Location: Medford, New Jersey
Contamination: Benzene-3,500 ppb (GW), 5,000 ppb (Soil); Toluene-5,200 ppb (GW), 160,000 ppb (Soil); Ethylbenzene-1,100 ppb (GW), 120,000 ppb (Soil); Total Xylenes-5,700 ppb (GW), 590,000 ppb (Soil); Total VOC TICs-4,140 ppb (GW), 850,000 ppb (Soil); and TPH-15,400 ppb (Soil).
Geology: Targeted portion of the aquifer is composed of clayey silts. GW is encountered at approximately 4-6 feet bgs.
Area Treated: Three areas of the property were treated, including the garage area underneath the residence. Target vertical treatment area between 4-15 feet bgs.
Effectiveness:  Maximum GW VOC reduction was achieved in MW-1 with each individual BTEXN compound treated by greater than 99% and total VOC TICs treated to ND value. Results from MW-2 showed reduction in VOCs ranging from 48%->99%; naphthalene showed an increase in concentration. Total VOC TICs were reduced by 55%. Post-treatment soil samples indicated reduction of all COCs except for total xylenes to below criteria in the sample collected north of the building; all COCs below criteria except for benzene in the sample collected beneath the residence; and all COCs treated below criteria in the sample collected south of the building.

Residential Property

ISOTEC CASE STUDY 57

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Site Location: Blackwood, New Jersey
Contamination: #2 Fuel Oil Related Compounds. VOCs-1,169 ppb (GW), SVOCs-2,460 ppb (GW), VOC TICs-611 ppb (GW), SVOC TICs-50,100 ppb (GW), and TPH-32,000 ppm (Soil). LNAPL sheen has been observed in site GW.
Geology: Targeted portion of the aquifer is composed of fine, medium and coarse sands to approximately 24 ft bgs. GW is encountered at approximately 17-18 feet bgs.
Area Treated: ~1,330 sq. ft at a vertical interval of 17-24 ft bgs.
Effectiveness:  Four existing and three newly installed monitoring wells were used to measure treatment effectiveness. Three locations showed low to ND levels. The four remaining locations showed reductions ranging from 93%-98% for VOCs, 88%-100% for SVOCs, 41%-95% for VOC TICs and 72%-96% for SVOC TICs. Two locations showed VOC increases.