EHC® Reagent was evaluated for treatment of soil containing volatile organic compounds (VOCs) and organochlorine pesticides (OCPs). The injections were conducted using hydraulic fracturing.
Former Pesticide Manufacturing Facility; Confidential client
Bench and pilot studies were conducted to determine the applicability EHC® Reagent for treatment of impacted soil. The goal of the project was to reduce source zone soil concentrations of OCPs and VOCs by injecting EHC® Reagent into the source area, which consisted of driving rods to these depths using a direct push rig, followed by hydraulic fracturing and injection of EHC
Toxaphene concentration decreased from 127.7 μg/g to 8.7 μg/g, respectively. Total OCP concentration decreased from 169.1 μg/g to 11.8 μg/g, respectively.
As featured in Remediation Journal, EHC Reagent was injected via direct push across the source area. Site specific challenges included a low permeability clayey lithology and a large degree of CVOC mass sorbed at the smear zone due to large variations in the groundwater table.
EHC was injected into a series of permeable reactive barriers (PRBs) across the plume with the goal to treat the entire plume area over time. After only 6 months CT concentrations were reduced by 99.7%, with all monitoring wells meeting the groundwater clean up criteria.
The EHC® PRB was installed as a line of direct push injection points across the width of the plume. Twelve years after the installation the PRB is still supporting >90% reduction in inflowing CT concentrations and the downgradient plume has reduced significantly in size and concentration.
As featured in Remediation Journal, EHC® Reagent and KB-1® Bioaugmentation Culture were injected across the highest concentration area from approximately 40 to 112 ft bgs using direct push. Prior to treatment dissolved phase concentrations ranged as high as 592,000 and 90,000 μg/L for TCE and cis-DCE, respectively.
As featured in Remediation Journal, EHC Reagent was emplaced via hydraulic fracturing into fine-grained sandstone to remediate TCE in groundwater.