The United States and American Gilsonite Company (AGC) have agreed to settle multiple violations of AGC?s National Pollutant Discharge Elimination System (NPDES) permit, including effluent limitation exceedances that have been occurring since 2012, and associated reporting violations, for $516,500. On September 9, 2019, a Stipulation and Order of Dismissal was filed to resolve the matter rather than a consent decree, because AGC has taken corrective measures to achieve compliance with its NPDES permit. AGC operates a Gilsonite mine in Bonanza, Utah on the Uintah and Ouray Reservation. AGC pumps mine dewatering effluent from its Gilsonite mine and discharges it to Coyote Wash, a tributary to the Colorado River, pursuant to the NPDES permit. AGC has violated certain terms and conditions of the NPDES permit. In 2015, AGC entered an Administrative Order on Consent (?Consent Order?) with EPA. The Consent Order required AGC to evaluate its options for complying with the NPDES permit and then submit a compliance plan to EPA. Following its evaluation of compliance options, AGC selected the use of an underground injection control (?UIC?) well to comply with the NPDES permit. AGC needed a UIC permit from EPA to construct and operate the UIC well. Based on the regional data available, neither AGC nor EPA expected the UIC well?s proposed injection site, within the Bird?s Nest Aquifer (?BNA?), to be an Underground Source of Drinking Water (?USDW?). In order to determine whether a USDW was