Inactive industrial facility with elevated levels of PCE, TCE, cis1,2-DCE, xylenes, and ethylbenzene in soil/GW under a storage shed. • Highest total VOCs – 23,410 ppb.
Limited plume size (3,500 SF) due to low permeability clayey-silts which also perched the WT (5’-15’).
Analytical data suggested past abiotic or reductive dechlorination with a typical cis-1,2 DCE stall.
Eden recommended in-situ oxidant soil blending in the former shed location (525 SF) and ISCO injection in the remaining plume.
Treatability Study
Treatability study performed to select the best oxidant and dose for blending.
Study compared CHP/MF with/without iron, alkaline activated SPS, and KPM.
Findings indicated CHP with iron salt and KPM best suited to site conditions.
Treatment scope developed by Eden included blending using approximately 21,900 lbs of HP + iron salt (MF) followed by addition of 22,000 lbs of potassium permanganate.
Results
Preliminary results indicate MF alone oxidized PCE by approximately 97%.
Following completion of blending, ISCO injection was performed using 34 DPT pts applying 2,500 lbs of potassium permanganate into the remainder of the plume.
Confirmatory soil and GW sampling performed in July 2018 indicated trace to low level VOCs conc below target levels!
