CCP 02-09-1998 - Laserfiche WebLink

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I I. ALTERNATIVE B I Descriotion The project includes the construction of a gravity sanitary sewer main extending from the current I location of Lift Station #11 south approximately 4,100 feet to connect to an existing 21 inch city interceptor sewer recently constructed along 14th Street N.E. The gravity sewer main would be I constructed with 10 inch diameter PVC pipe and would include manholes approximately every 300 feet. The sewer would require casing pipe under Highway 96 in order to allow for future maintenance and repair without disruption to Highway 96. The pipeline would run along the I east side of Round Lake Road and connect to an existing manhole at the intersection of 14th Street and Round Lake Road. The depth of the sewer would range from 20 to 28 feet from existing grade. I It is assumed that the gravity sewer would be constructed in conjunction with the reconstruction of West Round Lake Road and Highway 96. Constructing the sewer with the roadway project I would allow costs associated with pavement removal, traffic control and restoration of pavement and boulevard to be charged to the roadway improvements therefore lowering the costs for the sewer project. Based upon recent sanitary sewer construction in the project area it is anticipated I that dewatering would be required in the trench during construction. Estimated construction costs included with this report assume dewatering of the trench. ,- Exhibits 3 and 5 illustrate the alignment and typical section of Alternative B. Capitalized Cost Calculation , Costs associated with the gravity sewer main include the initial construction cost and periodic maintenance costs over the 60 year design life. Maintenance costs include labor costs for City I staff as well as costs for maintenance services which may be performed under contract in the future. Actual amounts utilized in the cost comparison are based upon current wage rates for City maintenance personnel and current costs for contracted cleaning and sealing services. I Maintenance costs assume that City staff will clean the sewer main once every five years and that each cleaning would require 32 man-hours. Equipment costs for cleaning have not been I included. It is assumed that the City would contract televising, cleaning and joint testing and sealing for the sewer main at year 30. I Initial Construction Cost (1998 dollars) = $389,125.00 'Construction Cost does not include any soil correction costs. I City Maintenance Cost (1998 dollars) - expended at five year intervals City Staff 48 Hr @ $25 .00/Hr = $1,200.00 I Contract Maintenance Cost (1998 dollars) - expended at year 30 ,- Televising and Cleaning 4,100 ft@$1.00/ft=$4,100.00. Joint Testing and Sealing 4,100 ft@ $2.50$/ft = $10.250.00. Total Contract Maintenance Costs = $14,350.00 , 4