Resources
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| remrx_crp_persulfate_white_paper_200806.pdf |
OverviewCase #41519_VOCs_UST
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Petroleum hydrocarbons and many other dangerous VOCs were discovered in the soil and groundwater at a former gasoline service station in eastern North Carolina. Underground storage tanks had previously been removed, but groundwater VOC levels persisted. Impacted soil beneath the former dispenser island from leaking supply lines were identified as the source.
The objectives of this pilot study were to remove the impacted soils and take a minimalistic, yet effective, approach to addressing residual groundwater contamination. The goal of the project was to deplete groundwater contaminants to below their respective NC 2L Standards. |
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Approach |
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The RemRx® technical consulting team utilized a proprietary remediation software to define CRP dosing requirements and worked directly with the site management consulting team to design a site-specific remedial plan. A 20’ x 20’ excavation perimeter was defined based on historical soil samples and groundwater monitoring data. Excavation depth of 8 feet allowed for placement of 902 lbs of persulfate-releasing RemRx® CRP into the smear zone (Figure 1).
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Figure 1 (Click to enlarge)
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Site Specific |
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Contaminant types and concentrations, as well as natural oxidant demand testing, led to site-specific dosing of 440 lbs of slow release CRP, followed by 462 lbs of fast release CRP. The amendments were activated and mixed ~1 ft. into the smear zone prior to backfilling with clean fill. These CRP applications allow for the treatment of residual contaminants left in the “margins”.
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Evaluated Data |
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Follow-up monitoring of groundwater conditions within and downgradient of the source area will be performed over the course of 3-12 months to determine the efficiency and effectiveness of the remedial action.
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