Why the technology was selected:
Excavation and disposal was selected as an expedient and effective remedy to remove the source area and minimize existing health risks.

Date implemented:
June 2000 (emergency response efforts) 2001 (primary removal of contaminated soil)

Final remediation design:
The remedy consisted of excavation of soil in an area of about 50ft x 25ft x 5ft. Excavation was to terminate at the anticipated extent of contamination; however, additional USTs and zones of contamination were identified during the excavation. This resulted in an area of approximately 100ft x 75ft x 20ft. The excavation was backfilled with clean soil from a local source with similar geology of parent material. Prior to backfilling, the walls were lined with a polybarrier to prevent recontamination from contamination remaining beneath buildings.

Other technologies used:
The release into the soil and drainage network that resulted from the tank rupture that occurred during demolition created a vapor intrusion problem for area residents and businesses. An emergency response action was implemented in which a catch basin, leading to a trench drain running under a neighboring residence, was plugged with concrete to prevent contaminant migration, and an explosion-proof blower aerated the fumes beneath the house.

Results to date:
Remedial actions, completed in 2002, removed contaminated soil up to the contiguous structures serving as residences, apartments, businesses, and the church. Approximately 144,000 ft3 (240ft x 40ft x 15ft) of contaminated soil remains beneath the buildings.

Next Steps:
None

Cost to Design and Implement:
$1,172,800 (Excavation, Disposal, Site Restoration)

Why the technology was selected:
Excavation and disposal was selected as an expedient and effective remedy to remove the source area and minimize existing health risks.

Date implemented:
June 2000 (emergency response efforts) 2001 (primary removal of contaminated soil)

Final remediation design:
The remedy consisted of excavation of soil in an area of about 50ft x 25ft x 5ft. Excavation was to terminate at the anticipated extent of contamination; however, additional USTs and zones of contamination were identified during the excavation. This resulted in an area of approximately 100ft x 75ft x 20ft. The excavation was backfilled with clean soil from a local source with similar geology of parent material. Prior to backfilling, the walls were lined with a polybarrier to prevent recontamination from contamination remaining beneath buildings.

Other technologies used:
The release into the soil and drainage network that resulted from the tank rupture that occurred during demolition created a vapor intrusion problem for area residents and businesses. An emergency response action was implemented in which a catch basin, leading to a trench drain running under a neighboring residence, was plugged with concrete to prevent contaminant migration, and an explosion-proof blower aerated the fumes beneath the house.

Results to date:
Remedial actions, completed in 2002, removed contaminated soil up to the contiguous structures serving as residences, apartments, businesses, and the church. Approximately 144,000 ft3 (240ft x 40ft x 15ft) of contaminated soil remains beneath the buildings.

Next Steps:
None

Cost to Design and Implement:
$1,172,800 (Excavation, Disposal, Site Restoration)