Agenda - 10-01-1996 - 7b - Laserfiche WebLink

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4 Total cost for completion of sewer system development for Phase I $ 1,051,000 Phase 11 8"pvc gravity line (w/stone bedding) 6000 linear feet @ $ 20.00 per if = $ 120,000 Precast concrete manhole w/cast iron ring/cover 20 each @ $ 1500 each = 30,000 16"highway bore encasement (for 8"pipe) 90 linear feet @ $ 120.00 per if = 10,800 Rock excavation/backfill 300 cubic yards @ $ 55.00 per cy = 16,500 Erosion control lump sum @ $ 2000 = 2000 Traffic control lump sum @ $ 1000 = 1000 Roadway/driveway repair lump sum @ $ 20,000 = 20,000 4" sewer services 35 each @ $ 600 each = 21,000 Mobilization lump sum @ 5.0% = 10,700 Engineerin contingencies, leggy administrative 25% = 58,000 Total cost for sewer system development for Phase II $ 290,000 Total cost for combined Phase I/H sewer system development as per Hazen and Sawyer master plan $ 1,341,000 We have also discussed providing some alternative or redesign of the Hazen and Sawyer sewer layout master plan to achieve at least some short term cost savings. One alternate design cost savings strategy involves: 1) eliminating the 1900 foot outfall along McGowan Creek; 2)not relocating the existing McGowan Creek pump station 1900 feet east of its existing location; and 3) constructing a smaller capacity pump station at the site of the proposed relocated McGowan Creek pump station. The smaller capacity pump station will retain the wet well design of the relocated pump station and the 10" force main discharge. This strategy reduces the net cost of the project by approximately $ 160,000 if standby or emergency power generation is not required. If construction of the original sewer design(with the relocated pump station, outfall line, etc.)becomes either necessary or desirable in the future,it can be accomplished without wasting anything constructed in the alternative design. The alternative design pumps can be removed or relocated.for other future phases of system expansion. In a second design alternative,I anticipate that the routing of the sewer along the western-most portion of Forrest Avenue can be revised to eliminate 350 feet of sewer and three manholes. This should reduce the total cost of Phase II by approximately$15,000. The alternate routing would still provide sewer service to the same existing structures as the Hazen and Sawyer layout. However,there a large tract of currently undeveloped property that would have been served by the original sewer routing that is not served by the alternate routing. Serving this property at some point in the future will be possible even with the alternate sewer routing,but that service will require extending the sewer line several hundred feet eastward from the alternate's proposed termination point. The estimated cost breakdown for the alternate sewer development project is as follows. Please note that the estimated total number of sewer taps at$600 each is approximate and subject to change. The cost