CCP 02-26-2008 - Laserfiche WebLink

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WATER SYSTEM IMPROVEMENTS - Staff recommends replacing the existing watermain on 14th Street NW from a point approximately 225 feet west of 29th Avenue NW to Silver Lake Road as part of this project. Please see the Watermain Replacement map on Page 10. This section of watermain is an 8 inch cast iron pipe (C.I.P.) which was constructed in 1960 and has experienced several breaks over the years. It is proposed the new watermain be 8 -inch polyvinylchloride (P.V.C.). The existing watermain is located north of the north curb line in the boulevard area. The new watermain will be installed in the roadway area which is more desirable in making it more accessible for maintenance and repairs. Along with the new watermain, new water services will be installed between the main and property line, and additional valves and new hydrants will be added to improve fire protection. All other watermains in the project area are the newer ductile iron pipe (D.I.P.) of which no watermain breaks have occurred to date. SANITARY SEWER IMPROVEMNTS - The sanitary sewer mains in the proposed reconstruction area have been inspected by televising. In reviewing the inspection reports, three problems were identified as needing repair. The sanitary sewer line on 14th Street NW at Silver Lake Road has a broken service wye that needs to be excavated and repaired. Also two sags were detected in sewer lines, one on 13th Terrace NW east of 27th Avenue NW and one in the easement south of 13th Terrace NW in the extension of 27th Avenue NW. These sags have the potential of causing sewer backup and are recommended to be excavated and repaired as part of this reconstruction project. Please see the Sanitary Sewer Repairs map on Page 11 showing the location of these problem areas. STORM SEWER IMPROVEMENTS - The City's Surface Water Management Plan shows no major improvements needed to the storm sewer system in the proposed reconstruction areas. At the informational meeting, a concern with street flooding at the intersection of 13th Terrace NW and 27th Avenue NW was brought to staff's attention. The addition of additional catch basins at this intersection will be investigated. Please see the Storm Sewer Improvement map on Page 12 showing the location of these problem areas. An inspection of the storm sewer system has found no major problems in the project area. However, if during construction a structure is found to need repair, it will be repaired before the final street work is done. 29TH AVENUE NW RETAINING WALL REPLACEMENT - The existing retaining wall in the west boulevard of 29th Avenue NW was constructed in 1986 of recycled concrete curb sections. The resident at 2908 Brookshire Lane has expressed safety concerns and displeasure with the appearance of the existing retaining wall and has requested the wall be replaced. Please see the 29th Avenue NW Retaining Wall Replacement Map on Page 13. 3