Sanitary Sewer Infiltration Study SA1301

On April 17, 2012, the City Council approved the FY2013 Budget and Community Investment Program (CIP). Included in the CIP Budget is the 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.

This project is scheduled for Consultant Design in the approved FY2013 CIP Budget and RJN Group, Inc., of St. Louis, Missouri is recommended for this work due to their expertise in identifying and analyzing sanitary sewer systems for inflow and infiltration. This will be the first 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 FY2013 phase of this project includes the analysis and study of two sanitary sewer basins that flow into the northwest waste water treatment plant as well as the flow monitoring of private sanitary sewer systems that connect to the City’s system to determine whether these private sewers significantly contribute to inflow and infiltration.

The attached proposal from RJN Group, Inc. details three specific fees that will provide investigation and analysis of the following areas: Sanitary Sewer Sub-Basin Southeast 9/Northwest 1 for a cost of $44,095.00; Sanitary Sewer Sub-Basin Northwest 3 for a cost of $74,711.50; and Metering of Sub-basin Manholes for a cost of $48,480.00. Therefore the not-to-exceed fee for this work would be $167,286.50.

The FY2013 CIP Budget includes $54,800 for design engineering services and $150,000 for construction ($204,800 in total funds for the FY2013 CIP Budget). Staff has determined that it would be more beneficial to perform investigation and analysis during FY2013 and plan for remediation/construction in FY2014; therefore the proposal from RJN Group, Inc. in the amount of $167,286.50 is recommended. There are sufficient funds available within the approved FY2013 CIP for these services.

On October 9, 2012, the City of Carbondale executed an Engineering Agreement with RJN Group in the amount of $167,286.50 for work on the City’s Sanitary Sewer Inflow and Infiltration Study (SA1301).


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