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DELINEATION TO DELIVERY: OPTIMIZATION OF ISCO WITH HYDRAULIC FRACTURING AT THE HEMPHILL ROAD TCE SUPERFUND SITE
Fulkerson, M., C, Allen M. Perlmutter, T. Williams, D. Seadler, and B. Bentowski.
DCHWS East 2024 Spring Symposium, 10-12 April, Philadelphia, PA, 13 slides, 2024
Filed Under: Cleanup News
Filed Under: Cleanup News
Recycling chemical drums by emptying their residual contents on the ground surface, and then burning and crushing the drums resulted in TCE-contaminated groundwater at the Hemphill Road Superfund site. To accelerate and optimize the restoration process, EPA prepared an Interim Action Record of Decision that included a phased remedial action to address the areas with TCE concentrations >300 µg/L first and the residual groundwater plume (TCE concentrations >5 µg/L) later. Following pilot tests, ISCO was selected as the remedial approach, with potassium permanganate injected into the partially weathered rock (PWR) and saprolite overburden using hydraulic fracturing technology. The target treatment zone extended from the groundwater table (~30 ft bgs) to the top of the bedrock (~60 ft bgs). A baseline groundwater sampling event and a dynamic plume delineation investigation were conducted to confirm the area requiring treatment and finalize the ISCO design. Permanganate injections were conducted using proprietary hydraulic fracturing technology to distribute 182,000 lbs of RemOx-S at 26 locations throughout the plume on 30-ft centers. Fractures were created approximately every five vertical ft from the water table, at ~ 30 ft bgs, to bedrock. Performance monitoring will be conducted at 1, 3, and 6-month intervals post-injection to evaluate the effectiveness of the remedy and inform the need for additional injections. https://drive.google.com/file/d/1Vmm3N1LnzG2rDNXagD4-TMXRATmshned/view
DCHWS East 2024 Spring Symposium, 10-12 April, Philadelphia, PA, 13 slides, 2024
Filed Under: Cleanup News
Filed Under: Cleanup News
Recycling chemical drums by emptying their residual contents on the ground surface, and then burning and crushing the drums resulted in TCE-contaminated groundwater at the Hemphill Road Superfund site. To accelerate and optimize the restoration process, EPA prepared an Interim Action Record of Decision that included a phased remedial action to address the areas with TCE concentrations >300 µg/L first and the residual groundwater plume (TCE concentrations >5 µg/L) later. Following pilot tests, ISCO was selected as the remedial approach, with potassium permanganate injected into the partially weathered rock (PWR) and saprolite overburden using hydraulic fracturing technology. The target treatment zone extended from the groundwater table (~30 ft bgs) to the top of the bedrock (~60 ft bgs). A baseline groundwater sampling event and a dynamic plume delineation investigation were conducted to confirm the area requiring treatment and finalize the ISCO design. Permanganate injections were conducted using proprietary hydraulic fracturing technology to distribute 182,000 lbs of RemOx-S at 26 locations throughout the plume on 30-ft centers. Fractures were created approximately every five vertical ft from the water table, at ~ 30 ft bgs, to bedrock. Performance monitoring will be conducted at 1, 3, and 6-month intervals post-injection to evaluate the effectiveness of the remedy and inform the need for additional injections. https://drive.google.com/file/d/1Vmm3N1LnzG2rDNXagD4-TMXRATmshned/view
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