Title
Ravinia Avenue North Extension Utility Investigation - Proposal
History
As part of the Ravinia Avenue Extension north of 143rd Street, rerouting of an existing 42” storm sewer is required. This storm sewer is currently located behind the existing Randy’s Market and will be rerouted down the middle of Ravinia Avenue as it is extended north of 143rd Street to Crescent. Several options were considered in the initial analysis to avoid work that would severely impact 143rd Street traffic or destroy recently reconstructed pavement. Using past success as a guide, staff consulted with Airy’s, Inc. of Tinley Park, Illinois. After reviewing options, consensus was that boring beneath the new pavement significantly reduced impact to 143rd Street traffic and the need for extensive restoration of freshly installed pavement and brick crosswalks. The chosen course of action will auger beneath 143rd Street installing a steel casing and new stormwater pipe. Once installed, the new pipe will be connected to the existing structure from inside the new pipe avoiding the traditional excavation pit at the point of new connection.
To evaluate the viability of this method and provide detailed information regarding known utilities for final engineering, hydro-excavating to visually locate existing utilities was required. On December 8, 2011, Airy’s, Inc. provided a proposal and was contracted to perform the hydro-excavating work for a cost of $4,077. As required, JULIE locates were requested and three specific hydro-excavation locations were identified. The Nicor gas main and AT&T duct package were found without problem. ComEd mismarked their conduit but was eventually found significantly deeper than expected. Comcast could not be located as marked even though they were asked and confirmed their location several times.
Utilizing their own staff and locating equipment, Airy’s identified a possible alternate location for the Comcast conduit requiring a fourth pavement cor...
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