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Objective: meet stringent safety standards while remediating a petroleum release at an elementary school located near a public water supply.
Result: Soili and groundwater were treated to a level of no significant risk and the site was closed. Remediation was completed under strict safety requirements without disruption to the school schedule.
Project Summary:
A #2 fuel oil spill from a defective 5,000 gallon underground oil storage tank caused widespread contamination of soil at an elementary school. Due to the location of the release adjacent to and below the school, and the depth of soils impacted by the release, Norfolk Ram Group engineers were enlisted by the consultant of record on an Immediate Response basis to design and implement In-situ Chemical Oxidation (ISCO). Because site work could not interfere with the normal operation of the school or cause safety concerns, Norfolk worked to develop a remedial plan for site closure that required implementation of stringent health and safety standards. Part of the plan to ensure safety was a weekend treatment schedule.
Working with the consultant, Norfolk designed an ISCO approach to remediate soils adjacent to and below the school. Norfolk addressed additional concerns for groundwater as the site was located upgradient of a pulic water supply well. A plan was developed to take advantage of a soil vapor extraction (SVE) system in conjunction with the ISCO treatments which significantly increased the effectivenss of the treatments. Portions of the SVE system were utilized to inject oxidizer into soils within the release area at depth. Norfolk conducted five ISCO treatments and delivered approximately 10,000 gallons of catalyzed oxidizer to soils and the consultant determined that conditions for site closure had been achieved.
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