Case study - Hydraulic slurry emplacement of potassium permanganate and zero valent iron for integrated site remediation
Site Description: An active electronic manufacturing facility had an on-site TCE handling unit that was active for 10 years. During this time, approximately 1,365 gallons of solvent was released, which created an approximate 16 acre plume in saprolite and bedrock.
Contaminants: Primarily TCE at concentrations greater than 200,000 ug/L in the source area with concentrations of 13,000 ug/L at the property boundary.
Remedial Challenge: The site challenges included high TCE concentrations, low permeability saprolite, highly transmissive bedrock, low natural attenuation, and a large plume area with limited accessibility (e.g., steep slopes, forest and highway present, off site contamination, etc.).
Remedial Approach: We integrated ISCO using potassium permanganate in the source area, with ISCR using zero valent iron barriers in the downgradient plume area. Reagents were injected as high-solids slurries to distribute large reagent volumes effectively within specific and focused target zones in the low-permeability saprolite and a fractured zone in bedrock.
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