CC PACKET 01281992 - Laserfiche WebLink

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Mr. Larry Hamer January 20, 1992 Page 2 • ' I D.D.C. Contractors This contractor was non-responsive in his proposal for grouting because he merely provided labor and equipment costs. Reviewing these numbers it is clear that costs from this contractor would greatly exceed those proposed by the previous contractor. A price of $88 ($102 with Jedlicki's fee) per square foot was proposed for concrete repair. J.T. Trout Corporation With 15% Contractor Fee Grouting for 3 cubic yards $4,205 $4,835 Grouting for 5 cubic yards $5,825 $6,699 Concrete repair would be $45 per square foot ($52 with fee) ; with a minimum of 160 s.f. of concrete repair the cost would be $8,280. The proposal indicated these prices are good only if both the grouting and concrete repair are to be performed. The estimated cost for doing eight sections of pipe would be $14,979. In addition to repair, replacement and reconstruction might be considered. • The pipe could be demolished and replaced with new round pipe. This alternative would cost about $140 per lineal foot or $7,000 for eight sections. The existing arch pipe could be removed, the void filled, and the arch pipe replaced with a bitumastic sealant in the joints for about $60 per lineal foot or $3,600 for eight sections of pipe. The three best alternatives appear to be repair by grouting only, replacement with new pipe, or reconstruction using the existing RCPA. The grouting option would effectively deal with any foundation weakness that remains, but there is an inherent risk of cost overrun and does not solve surface spalling problems. Replacement with new round pipe is the lowest risk option and solves any problems with surface spalling. Reconstruction of the existing RCPA is the lowest cost alternative, but does not address the spalling problem and there is a risk some sections may break and require replacement with new pipe. I recommend the installation of new round pipe, but not necessarily right now. Precast concrete usually shows signs of distress before total failure.. Since the foundation of the pipe appears to be adequate, although not perfect, I recommend that the pipe be monitored for structural failure or foundation problems. when the spalling can no longer be tolerated or the foundation shows signs of imminent failure, then the pipe can be replaced. Sincerely, Dana R. Gauthie DRG/kmh 23\27\522\LH.LTR