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Background

A former industrial manufacturing facility in western Arizona had an active Underground Storage Tank (UST) case with the State of Arizona Department of Environmental Quality (ADEQ) for over 30 years. The facility was used for commercial manufacturing in a downtown urban area. The site’s long history of remediation activities included free product skimming, dual-phase extraction, soil vapor extraction (SVE), and a few excavations to remove petroleum hydrocarbon impacted soils.

Antea Group®, a leading global environmental consulting firm, was transitioned as the primary consultant for the site in late 2016 to perform remedial site characterization activities and determine an effective and timely path to closure to enable a property transaction at the site. These efforts led to Antea Group developing a remediation plan for in situ soil mixing using RegenOx® and ORC Advanced® in the most highly contaminated zone and in situ chemical oxidation (ISCO) injections using PersulfOx® elsewhere in the plume. The approach was favored over several remedial alternatives, including thermal (i.e., electrical resistance heating or ERH) treatment.

Combined Remedy Leads to Site Closure