Document Overview
This case history describes a soil and groundwater remediation design in St. Louis County, Missouri where PES-31 biotreatment products were incorporated into a broader remedial system for waste oil tank related contamination.
Reported Remediation Results
| Metric | Before / Initial | After / Final | Reported Change | Notes |
|---|---|---|---|---|
| Installation cost savings | Conventional later installation would have increased cost | At least $15,000 in savings reported | Cost savings from installing system components during UST closure | Reported in source document |
| Groundwater monitoring wells | Groundwater contamination required assessment | Four monitoring wells installed | Monitoring network established | Source document states four monitoring wells were installed |
| Treatment wells | Limited excavation possible | Two treatment wells installed in waste oil tank excavation backfill | PES-31 delivery points incorporated into remedial system | Source document also describes treatment beneath the building |
| Groundwater recovery pumps | Contaminated groundwater present on site | Three existing monitoring wells fitted with groundwater recovery pumps | Groundwater directed to an air stripper | Part of the three-tiered remedial design |
Project and Application Details
PES Application Summary
PES-31 biotreatment products were applied through existing treatment wells in the waste oil tank pit area and beneath the building. The remedial design also used groundwater recovery pumps, an air stripper, and a vacuum extraction system connected to previously installed piping.
Reported Outcome
The source document reports that the Missouri Department of Natural Resources approved the remedial design and that the system had been operational since February 1992.
Key Takeaways
This case history supports PES-31 positioning as part of a broader remediation system involving soil, groundwater, treatment wells, groundwater recovery, air stripping, and vapor extraction. It also highlights the value of installing remedial system components during UST closure work.
Related PES Information
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