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!.-1, . <br />MEMO TO: MAYOR AND COUNCILMEMBERS <br />FROM: MARY SAARION, DIRECTOR M 3 <br />-� PARKS, RECREATION AND FORESTRY <br />DATE: JULY 5, 1989 <br />SUBJECT: SILVER VIEW PARK PATHWAY DITCH <br />Public works has requested the installation of a vehicular passageway across the <br />western outlet ditch at the site of the Silver View Park pathway extension project. <br />Currently a small pedestrian bridge is present. When the pathway extension is <br />installed, a larger passageway must be replaced on the higher grade to evade <br />swamping the passage during very heavy rainstorm drainage. It was originally <br />planned that an adequate wooden pedestrian bridge similar to the present bridge be <br />built and installed on the upper ridge. However, the public works department has <br />recently requested a facility which is maneuverable with a maintenance vehicle, to <br />enable quicker maintenance upkeep of the pathway aitd for trash removal detail. '[ire <br />cost of two culvert options are: <br />Ontinn -ii - aa" m—due" $ 6,500.00 <br />Option #2 - Metal arch $13,000.00 <br />A third option is a metal bridge adequate to serve vehicular use. <br />Option #3 - Inexpensive pedestrian <br />bridge which would barely allow <br />a small pick-up truck $20,000.00 or <br />$25,000.00 <br />Ti,c. size and style of the second culvert option has been recommended by City <br />Engineer Minetor. It will be large enough to handle the five year storm. (See <br />attached information.) <br />As you can see, the most inexpensive option is the placement of a culvert. There are <br />two culvert options and City Engineer Minetor recommends the metal arch at an <br />estimated price of $13,000. It has a greater water volume capacity than the 48" <br />culvert. The cost of the bridge, option #3, is about twice the cost of installing a <br />culvert. <br />There are advantages and disadvantages to installation of a facility passable by <br />Advantaees: <br />1. The advantage is ti,ai nark mainrenar. c cn the trail could be much speedier if <br />a maintenance vehicle were able to cross at that point and continue around the <br />pathway for maintenance, trash removal and inspections. <br />