Mifflin Township Sanitary Sewer Inspection

Sanitary Sewer Extension Mifflin Township, PA

New Sanitary Sewer Connection, Adding to the Health and Safety of the Township’s Citizens.

Act 537 requires that every municipality in Pennsylvania develop and maintain an up-to-date sewage facilities plan. The main purpose of the Plan is to protect the health, safety, and welfare of the citizens living in the municipality. As part of this requirement, Larson Design Group (LDG) designed a new sanitary sewer system for Mifflin Township, Columbia County, Pennsylvania to better address the Township’s sewage disposal needs in the Mifflinville area. Prior to commencement of the design, LDG helped the Township secure $4 million in a USDA Rural Utility Services (which provides assistance to rural communities) grant and loan, as well as a $400,000 grant through their legislator, then Pennsylvania Representative John Gordner.

The project included a major river crossing of roughly 1,300 feet under the Susquehanna River to convey sewage from Mifflin Township to its ultimate diposal in the Berwick Area Joint Sewer Authority (BAJSA) system. Crossing the river required evaluation of several alternatives, including attaching a force main on a bridge and going under the river bottom. PennDOT restricted the use of the bridge but did allow the use of their right-of-way along the bridge piers in the river. Entering the river required an aquatic survey to be completed, due to rare species of mussels. Skelly & Loy was used as a subconsultant to do the scuba work associated with the mussel protection.

A novel approach in design was used to deliver the sewage across the river as the receiving sewer limited the flowrate that sewage could flow under the river. A sub-surface equalization structure was designed so that Mifflin Township's flows could be handled and also so that the BAJSA collection system would not be flooded. This required that only one sewage pump could be in operation at a time.

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