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In May 2017, a suspected release was reported at an active gasoline station in Colorado when stained soils were discovered during the replacement of the underground storage tank (UST) spill buckets. Contamination associated with this release was later confirmed within and adjacent to the UST basin with benzene, ethylbenzene, xylenes, and MTBE concentrations in groundwater detected above the Tier 1 risk-based screening levels. As a result of these groundwater impacts, further corrective action was warranted. The site and UST system where the release occurred is fully operational and groundwater contaminants were mostly contained within the active UST basin. However, some contaminants had migrated into the surrounding soils (predominantly clayey sand) and weathered bedrock (claystone). Consequently, a remediation approach was needed that would be minimally disruptive, chemically compatible with the active UST system, and highly effective.


No Further Action Granted, Allowing Site Redevelopment to Move Forward