Project Experience

Challenge

Chrome plating operations impacted over 10,000 tons soil and 66,000 sq.ft. of groundwater with hexavalent chromium, nickel, arsenic and antimony. A 300 foot long groundwater plume extended off-site under neighborhood homes. Prospective remediation consultants estimated cleanup at over $8 M and over 15 years duration. AcuityES proposed a remediation scope of work at less than $4.5 M and a 2 year duration.

Action

AcuityES utilized the first ever application of a nanoscale iron sulfide (FeS) reductant for the purpose of in situ geochemical reducing and stabilizing the site contaminants. A dual axis blender was used to mix 78,000 gallons of FeS into contaminated soils to a depth of 15 feet. Dual Rotosonic drill units were used to inject over 40,000 gallons of FeS at 175 injection points into contaminated groundwater. Long term postremediation groundwater monitor was implemented.

Results

Confirmation soil sampling conducted 2.5 months following treatment confirmed non-detectable levels of hexavalent chromium and the geochemical stabilization of other contaminants. Post-remediation groundwater sampling confirmed that clean-up objectives were reached within 5 quarters of groundwater monitoring. AcuityES completed the project for about $4 M and in less than two years.

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