Following a truck accident on one of the main motorways in northern Italy, about 3,000 L of 1,2-dichloropropane was released into the ground, causing an immediate contamination of the soil and groundwater. 55,000 kg of EHC® Reagent was injected into a triangular grid of 42 injection points from one to six meters bgs.
Truck Spill Response
1,2-Dichloropropane
The site’s remedial goal was to achieve at least a 90 percent reduction in 1,2-dichloropropane compared to baseline concentrations. Data confirmed an effective EHC lifespan of at least three years allowing the successful long-term treatment of the site’s clayey formation.
This paper describes the implementation and results of the treatment that lead to site closure in 2015.
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.