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Feasibilitc Shide <br />Farmers' High Line Canal and Reservoir Company <br />October 2010 <br />l. No Action <br />2. Perform tree/shrub removal and select repairs to the structure ($114,000) <br />3. Remove and replace the entire stnlcture ($345,000) <br />Alternative l, No Action <br />If left as is, the existing structure will continue to deteriorate. li1 fact, as i7lore erosion occurs <br />exposing stnicture elements to the weather, the rate of deterioration will lilcely accelerate. <br />Tlus alternative was not selected because inaction would eventually result in the structure losing <br />serviceability. <br />Alternative 2, Construction of Modifications <br />Tlus option is the preferred alternative. This alternative would involve performing select repairs <br />which will extend the structure's service life. While this option would not entirely alleviate the <br />problems of the deteriorating siphon they would bring it bacic into serviceability and enable the <br />siphon to function properly for years to come. <br />Recominended repair actions include: <br />■ Removal of woocly vegetation around the stnicture <br />■ Excavation along the outside of the concrete box culvert to expose areas of observed <br />seepage <br />■ I�IStallation of sealant along outside of wall in areas of seepage (this may include injection of <br />epoxy grout) <br />■ Cleaning of areas with surface damage <br />■ li7stallation of steel dowels to supplement exiting corroded steel <br />■ Installation of cementatious patch primer <br />■ I�lstallation of high strength shotcrete or hand trowelled patch material <br />The cost associated with this alternative would be $114,000. <br />Alternative 3, Reinoval and Re�lacement of the Siphon <br />This alternative would involve demolishing the siphon and rebuilding a new one. The cost of <br />implementing this alternative would be $345,000. This alternative was rejected due to the high cost <br />associated with it. <br />Ralston Creek Siphon <br />The FHL Canal crosses underneath Ralston Creelc using a cast-in-place concrete inverted siphon. <br />The siphon is located to the north of West 67th Place and south of West 70th Avenue in the <br />Westwood's Golf Course in the City of Arvada, Colorado. The siphon is located along a bilce path <br />malcing it accessible to the public. The stn�cture consists of short upstream transition walls that <br />converge into a divided rectangle approach. This approach has a downward sloping apron and <br />-7- <br />