The Bismarck WWTF Facility Planning had most recently been completed in 2002, and AE2S was hired to provide an update to the planning prior to implementation of the trickling filter rehabilitation design to confirm that the plan was still "on the right track." The Basis of Design Update included updated population projections, updated flows and loads, updated regulatory review, and future regulatory requirements projections. The approach for the future regulatory projections included using the USEPA’s 2013 ammonia criteria guidance that had not yet been incorporated into the State water quality standards as well as projecting future nutrient (nitrogen and phosphorus) limits based on recently adopted standards from neighboring states. The future regulatory projections proved to be very valuable in confirming that the City could move forward with the improvements project while also having compliance options for the future. The improvements design is anticipated for completion in 2015 and includes headworks odor control rehabilitation, trickling filter pump station replacement, existing trickling filter rehabilitation, a new trickling filter, and miscellaneous improvements.