Most environmental impacts associated with residential properties involve leaking underground storage tanks (USTs) or piping used to supply heating oil. The spills are usually isolated to the immediate vicinity of the source area but have been known to spread off the property in some instances. Complexities include treating contamination below basements and near the foundation wall where access is limited. Contaminants of concern (COCs) usually associated with heating spills include benzene, toluene, ethylbenzene, xylenes (BTEX), naphthalene, #2 fuel oil and total petroleum hydrocarbon-gasoline/diesel range organics (TPH-GRO & DRO).

Lakefront Residence (Isotec Case Study 8)

• Site Location: Sussex County, New Jersey
• Contamination: Fuel Oil #2; TPH = approx. 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.

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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.

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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.

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