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What is in-situ chemical oxidation (ISCO)?

In-situ chemical oxidation (ISCO) is an environmental remediation technique where chemical oxidants such as persulfate, permanganate, or hydrogen peroxide are injected into contaminated soil and groundwater to destroy organic contaminants like TCE, PCE, and petroleum hydrocarbons in place — without excavation.

What contaminants can IET remediate?

IET specializes in TCE remediation, chlorinated remediation, and comprehensive environmental treatment. We remediate chlorinated solvents (TCE/trichloroethylene, PCE/perchloroethylene, DCE, vinyl chloride), petroleum hydrocarbons (BTEX, gasoline, diesel, MTBE), heavy metals (chromium, lead), NAPL, DNAPL, PAHs, creosote, and mixed contamination using ISCO, ISCR, bioremediation, EZVI, and ISGS technologies.

How long does environmental remediation take?

Remediation timelines vary by technology and site conditions. ISCO can achieve significant contaminant reduction in weeks to months. Enhanced bioremediation typically requires 2–5 years of active treatment. IET's patented ferric iron-activated persulfate provides sustained treatment lasting over 2 years to prevent contaminant rebound.

What states does IET provide environmental drilling services?

IET provides environmental and geotechnical drilling services nationwide including Pennsylvania, Ohio, North Carolina, South Carolina, Texas, Florida, New Jersey, New York, Virginia, Georgia, Tennessee, Indiana, Illinois, and more. IET operates 50+ specialized rigs including CME, Geoprobe, AMS, and barge drilling equipment.

Former Gas Station

Erie, Pennsylvania

Project Data

Project Year

2016

Project Duration

5 months

Contaminants of Concern

BTEX

TPH

Remediation Technologies Used

• In-Situ Chemical Oxidation (ISCO)
• Direct Push Injection
• Multi-Phase Treatment

Key Results

✓Over 90% BTEX reduction achieved
✓TPH levels below action levels
✓Dissolved phase petroleum effectively destroyed
✓Site achieved regulatory closure
✓Property redevelopment enabled

Target Contaminants

BTEX

TPH

Site Background

This former gas station site in northwest Pennsylvania experienced petroleum releases from underground storage tanks (USTs) that resulted in significant soil and groundwater contamination with BTEX compounds and total petroleum hydrocarbons (TPH).

The contamination threatened nearby receptors and required prompt remediation to achieve regulatory compliance.

Remediation Strategy

IET implemented an in-situ chemical oxidation (ISCO) program specifically designed for petroleum hydrocarbon contamination. The strategy included:

Advanced oxidation chemistry for rapid petroleum destruction
Multi-phase injection approach to address residual contamination
Strategic targeting of source zones and dissolved plume
Treatment of both vadose and saturated zones

Implementation

The ISCO program was executed using direct-push injection technology to deliver oxidation reagents throughout the contaminated zones. Multiple injection points were installed to ensure comprehensive coverage of the treatment area.

IET's experienced field crew completed the work efficiently while maintaining strict safety protocols and minimizing site disruption.

Results

The chemical oxidation treatment achieved excellent results:

BTEX concentrations reduced by over 90%
TPH levels decreased below action levels
Dissolved phase petroleum effectively destroyed
Site achieved regulatory closure requirements
Property redevelopment enabled

Project Category

Petroleum Contamination

Related Services

Learn more about the remediation services and technologies used in this project