GR-320-IRC-R™ carbon based Injectate (CBI) was used to remediate petroleum hydrocarbon impacted groundwater present in soil and groundwater at a UPS® Facility in Fort Myers, Florida. The CBI was injected using CleanInject® technology provided by Enviro-Equipment, Inc. The injection was successful in achieving site cleanup goals.
The site is an active UPS® Station with hydrocarbon impacted groundwater and soil from a former unleaded gasoline underground storage tank (UST). The objective at the site was to reduce benzene and naphthalene concentrations to below the Florida Department of Environmental Protection Groundwater Cleanup Target Level (CTL). Prior to carbon injection, Arcadis (UPS®’ Consultant) performed two IXPER® 75C calcium peroxide injections that were inefective. Subsurface materials include very fine to coarse sand with trace amounts of silt, shell fragments, and limestone boulders, underlain by limestone. Groundwater ranges between 2 – 5 feet below ground surface. Due to the facility being an active UPS® station, the equipment had to be setup and broken down each day.
March 2014, approximately 4,320 lbs of GR-320-IRC-R CBI was injected in 18 injection points spaced 10 feet apart. The injections were performed from 2 feet to 14 feet below ground surface. Injections required 4 days to complete due to working around the UPS® truck schedule. Due to the lithology present at the site, very low pressure was necessary to inject the slurry into the formation. Daylighting occurred at the shallow injection intervals in multiple boreholes. Carbon slurry in intervals that could not be completed due to daylighting was applied to subsequent intervals.
After the GR-320-IRC-R injection, persistent benzene levels dropped by nearly 50% based on the results of the first sampling event. Although napthalene levels increased, they quickly dropped below CTLs in subsequent samples. Benzene levels hovered slightly above CTLs, so another calcium peroxide injection was proposed. Baseline sampling right before the calcium peroxide injection showed all CoCs below CTLs. The baseline sample data was not available until after the calcium peroxide injection was already performed.
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