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C150154 Feasibility
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C150154 Feasibility
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Last modified
8/10/2011 9:58:50 AM
Creation date
6/28/2007 9:26:25 AM
Metadata
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Template:
Loan Projects
Contract/PO #
C150154
Contractor Name
Pine River - Bayfield Ditch Company
Contract Type
Loan
Water District
31
County
La Plata
Loan Projects - Doc Type
Feasibility Study
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<br />Alianment Option <br /> <br />Advantaaes <br /> <br />1. The new siphon will remain on the old established rights-of-way. The majority of the <br />east half of the old siphon is installed in a steep and very rocky slope. Installing the new <br />siphon in the old trench would eliminate the need and expense for blasting operations to <br />remove rock overburden to install the PVC pipe. <br />2. The surface of the ground at the center portion of the old siphon shows evidence of <br />boggy soils. Excavation of a trench adjacent to the old siphon could yield considerable <br />savings associated with eliminating the need to over excavate saturated material and the <br />purchase, hauling and backfill of other material to produce a solid foundation to lay the <br />new pipe on. <br />3. Installation of the east half of the new siphon would be on less boggy/saturated soils. <br /> <br />Alianment Option <br /> <br />Disadvantaaes <br /> <br />1. A higher probability exists with this option for increased costs associated with over <br />excavation of boggy /saturated soils to construct a proper foundation for the PVC pipe. <br />2. Boggy soils could extend to a distance of several feet beyond the existing old siphon <br />alignment. <br />3. The length of the siphon would be increased and cost associated with the blasting of <br />rock formation will undoubtedly be incurred. <br />The advantages and disadvantages of each alignment will be evaluated during the survey and <br />design phase of construction. The option showing to yield the least overall construction costs <br />will be selected. <br /> <br />Alternatives <br /> <br />Three construction alternatives have been evaluated: <br />1 ) The No Action Alternative <br />2) Sleeve (Slip Line) the Existing Siphon <br />3) Siphon Replacement. <br /> <br />Alternative 1 - No Action <br /> <br />The No Action Alternative consists of simply not taking any remedial action to rehabilitate the <br />Beaver Creek Siphon. This would result in using the siphon until the PRBD Company <br />experiences catastrophic failure. The cost associated with the resulting property damage and <br />loss of agricultural production, depending on the time of failure, could escalate the expense of <br />replacing the siphon by a conservative estimate of two to three times and beyond. <br /> <br />Alternative 2 - Sleeving or Slip Line <br /> <br />To sleeve or slip line the existing siphon would eliminate the unknown problems associated with <br />excavation of boggy soils. A new line would simply be pulled through the old line and the sleeve <br />would be connected to larger diameter pipe on each end of the siphon to "load" the pipe and <br />create enough velocity to deliver approximately 37 cubic feet per second at the outlet works. <br />The cost to slip line the siphon was projected by United Pipeline Systems, on 4/29/2003, to cost <br />approximately $187,000. This cost estimate includes the pipe (28-inch) and the slip line only. It <br />does not include the required excavation at various increments along the siphon to allow <br />constructors to pull the line through the existing siphon. <br /> <br />PRB Ditch Company <br />Siphon Replacement Feasibility Study <br />June 2003 <br /> <br />Page 8 of 15 <br />
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