Brinjac, Kambic, and Associates (2000) completed a feasibility analysis for upgrading the Harrisburg City Advanced Wastewater Treatment Facility (Harrisburg, Pennsylvania) for nutrient control. This facility was considered to be typical of many of the plants designed to meet the effluent requirements of the federal Clean Water Act. The facility is in the colder climate in northeastern United States and is a principal point source contributor of nitrogen to the Susquehanna River. The river flows to the Chesapeake Bay where efforts are underway to improve water quality by reducing the nutrient load to the bay. The facility is site-constrained with little room for flow or process expansion. Due to the results of the feasibility study, Brinjac, et al. recommended that the facility implement the innitri process. (As of this date, the city has not yet initiated the project