In order to help St. Louis MSD, eliminate constructed SSOs as part of MSD’s Consent Decree agreement with the EPA, M3 Engineering designed and prepared plans for 6,000 feet of 48” diameter relief sewer. M3’s effort began by analyzing and evaluating alternative alignments from Two Mile Creek to Log Cabin Lane. Once MSD selected the preferred alignment, M3 modeled the existing and proposed sewers using XP-SWMM to determine the correct sewer sizes that would eliminate SSOs. Construction documents were prepared and included Plan and Profile drawings and technical specifications. M3 secured permits with several agencies and municipalities.