Sanitary Sewer Inflow and Infiltration Study SA1301

On April 22, 2014, the City Council approved the FY2015 Budget and Community Investment Program (CIP). Included in the CIP Budget is continued work on the City’s Sanitary Sewer Inflow and Infiltration Study project (SA1301). The purpose of this project is to identify sources of inflow and infiltration of storm water into the sanitary sewer system.

The first and second phases of this project were completed in FY2013 and FY2014 by RJN Group, Inc., of St. Louis, Missouri. Staff is pleased with the performance of RJN Group, Inc. and recommends the City continue to use them for the FY2015 phase of this project. FY2015 will be the third phase of a multi-year project to investigate the City’s sanitary sewer system with the end result being to significantly reduce excess flows that are created by storm water entering the sanitary sewer system during rain events. The FY2015 phase of this project includes the analysis and study of nine (9) sanitary sewer basins that flow into the Southeast Wastewater Treatment Plant (SEWWTP).

The attached proposal from RJN Group, Inc. details three specific not-to-exceed fees that will provide investigation and analysis of the following areas: Sanitary Sewer Sub-Basins Southeast #’s 2, 5, 6, 7, 8, 10, 12, 13, and 14 for a total not-to-exceed cost of $265,355.50.

The FY2014 CIP Budget includes $265,000 for consultant design engineering services and $13,480 for inhouse engineering services ($277,480 in total funds for the FY2015 CIP Budget). Staff has reviewed the proposal from RJN Group and has determined that funds from planned in-house engineering expenses can be used to cover the difference of $355.50 for consultant design services should it become necessary; therefore it is recommended that the proposal from RJN Group, Inc. in the amount of $265,355.50 be approved.

The City of Carbondale executed an Engineering Agreement with RJN Group in the amount of $265,355.50 for continued work on the City’s Sanitary Sewer Inflow and Infiltration Study (SA1301)

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