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The quality of water in the 15-mile downstream reach of Dardenne Creek in St. Charles County, Missouri, was assessed to determine if it met the Missouri water-quality standards. Concentrations of dissolved-oxygen and total ammonia as N failed to meet water-quality standards downstream from the Harvester-Dardenne and St. Peters Wastewater-Treatment Plants. Management alternatives using current, design-capacity, and future expansion wastewater discharges from the St. Peters Wastewater-Treatment Plant were evaluated by using the QUAL-II/SEMCOG model, which was calibrated and verified using two independent data sets from Dardenne Creek. Results of computer simulation indicate that a nitrification-type advanced-treatment facility installed at the plant would protect the stream's beneficial uses. This type of facility would produce a 5-day carbonaceous biochemical-oxygen demand of 10 milligrams per liter and a total ammonia as N concentration of 2.0 milligrams per liter. An effluent limit of 5.0 milligrams per liter of 5-day carbonaceous biochemical-oxygen demand would further improve the water quality of Dardenne Creek; however, an additional treatment process, such as sand filtration, would be needed to achieve this criterion.

Water-quality assessment and wastewater-management alternatives for Dardenne Creek in St. Charles County, Missouri