Document Overview
This case history describes in-situ soil bioremediation using PES-31 at a service station remodeling and underground storage tank closure project in St. Louis County, Missouri. Waste oil tank contamination was present below a building where excavation access was limited.
Reported Remediation Results
| Metric | Before / Initial | After / Final | Reported Change | Notes |
|---|---|---|---|---|
| Regulatory concurrence timing | Plan submitted during UST closure/remodeling project | Concurrence received within three days | Rapid concurrence reported | Missouri Department of Natural Resources concurrence stated in source document |
| Application period | Monthly applications began July 1991 | Applications continued through November 1991 | Five-month active application period | Treatment outcome described after six months |
| Treatment access points | Contaminated soil below building | Horizontal slotted screen with vertical risers plus two interior treatment wells | In-situ access created for PES-31 and nutrients | System components described in source document |
Project and Application Details
PES Application Summary
The treatment system used slotted screen placed horizontally along the building foundation with vertical risers on each end. Two treatment wells were installed inside the building to provide access for PES-31 biotreatment products and nutrients to contact the contaminated soil below the building.
Reported Outcome
The source document reports that PES-31 successfully remediated the soil beneath the building after six months of treatment.
Key Takeaways
This case history supports PES-31 use where contaminated soil cannot be fully excavated because of structures or access constraints. It is useful for in-situ soil bioremediation content and UST closure related applications.
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