MTBE Remediation

Former Hardware Store in Florida 






In 2003, a discharge of petroleum products occurred from the UST system’s spill containment buckets. In February 2005, phase 1 of the remedial approach involved the excavation, transport and proper disposal of an estimated 1,000 tons of impacted soil. The sandy soil lithology present at the site resulted in slumping of the excavation sidewalls as the excavation was advanced vertically. This condition coupled with the close proximity of buried utilities, the road right of way (to the east) and the former hardware building (to the west) significantly reduced the volume of impacted soil that could be excavated safely. As of result only 279.04 tons of impacted soil was removed and transported off-site for disposal.

In December 2005, phase II of the remedial approach involved the injection of DeepEarth Technologies, (DTI) Cool-Ox® reagent at forty-eight injection points across the site. The reagent was injected directly into the soil/groundwater matrices from six to fifteen feet below land surface using a direct push technology (DPT) rig. While injecting near the road right of way, DTI penetrated a high-pressure water main. DTI contracted with Roto-Rooter to make the necessary repairs to the water main. Following repair of the water main, Roto-Rooter replaced the asphalt surface cover and was observed using raw gasoline as a softening agent for the asphalt. As a result of this mishap, DTI performed additional injections at the site in March and September 2006 in an effort to further remediate the site. MTBE concentrations were reduced from 35,000 parts per billion (ppb) to below regulatory clean up levels of 20 ppb. The site received a Site Rehabilitation Completion Order (SRCO) on September 1st, 2010.

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Type of Site: Former Hardware Store

Location: Panama City, Florida

Contaminants: MTBE

Work Scope: Inject Cool-Ox® Reagent

Media Treated: Soil & Groundwater

Soil Type: Fine, Silty Sands

Groundwater Depth: 3-4 fbgs

Remedial Objectives (Phase 1):

Reduce groundwater concentration to GCTL's

Application Method: DPT Probe Rig

Area Treated: 1,200 square Feet

Vertical Interval: 8 to 15 feet bgs

Injection Point (IP) Spacing: 5 ft

Media Volume Treated: 311 cubic yards

Number of Injection Points: 48

Cool-Ox® Volume: 2,000 gallons

Cool-Ox® per IP: 42 gal


The residual contaminated groundwater and soils at the site have been remediated to below cleanup target levels. A Site Rehabilitation Completion Order (SRCO) has been achieved. No Further Action is required.


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