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TO: Mayor Richard C. Irvin
FROM: Kurt Muth, P.E., Engineering Coordinator
DATE: March 25, 2019
SUBJECT:
A resolution to award the Breckenridge Drive Sanitary Sewer Improvement project to Brandt Excavating, Inc., 385 E. Hoover St., Morris, IL 60450 located in Ward 8.
PURPOSE:
To install a 10" relief sanitary sewer along Breckenridge Drive between Inverness Drive and Waterbury Court that will add capacity to the sanitary sewer system where there are capacity issues that have led to basement back-ups during significant rain events.
BACKGROUND:
The City of Aurora has confirmation that 10 sewer backups have occurred near the intersection of Inverness Drive and Clarendon Lane in the Oakhurst Subdivision. The backups occurred as a result of the severe storm events that occurred on October 14th, 2017 and in April 2013. As a result, the City of Aurora engineering division evaluated this basin of sanitary sewers by means of flow metering, sewer televising and manhole inspection. This investigation found that a unit of the Oakhurst subdivision, which was one of the last areas in town that had the sanitary sewer constructed with clay pipe, is experiencing large volumes of inflow and infiltration (I&I) during rain events. The clay sanitary sewer mains in this unit were lined with a cured in place pipe liner in early 2018 but the resulting reduction of I&I was not significant enough to confidently eliminate future back-ups because I&I is still entering the system via the clay services in that unit. This unit of the subdivision is upstream of the area where the basement back-ups occur. Flow metering has confirmed excess flow during severe rain events has compromised the capacity of the sewer on Breckenridge Drive which led to the sewer back-ups. This proposed 10" relief sewer will separate the excess flows from the area that has basement back-ups and route the flows to a downstream sewer with a larger capacity.
DISCUSSION:
Four bids were received, opened, and...
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