2012-09-25_PWETC_AgendaPacket - Laserfiche WebLink

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Roseville Public Works, Environment and Transportation Commission Agenda Item Date: September 25, 2012 Item No: 6 Item Description: Watermain Lining Presentation Background: The majority of the city's water main pipes were originally constructed in the 1950's and 1960's, utilizing cast iron pipe. In the 1970's, the pipe materials used in construction changed from cast iron to ductile iron. This older infrastructure is nearing the end of its useful life. The aging pipe is becoming more brittle and prone to water main breaks. There is an average of 30 water main breaks in Roseville every year. As the pipes continue to age, this number will continue to increase. A Roseville watermain rehabilitation project is currently being advertised for bids; if favorable bids are received construction is anticipated to begin in November. New technologies in the industry have allowed cities to begin evaluating trenchless methods of water main pipe rehabilitation as a viable alternative to open -cut pipe replacement. One of these technologies is a cured in place pipe (CIPP) liner, similar to that used on sanitary sewer lining projects. Similar to sewer lining, the watermain is cleaned, televised to note service locations, lined, and then services are reinstated using a robotic cutting device. This process requires a temporary water system while the work is completed. Another lining technology is one that 3M has developed, which is a spray in place lining system. The liner material is applied via a trenchless spin case application system. In this process, the material does not seal off the water services, so a robotic cutter does not need to be used to reestablish service connections. The cure time is much faster on this type of liner; it is possible to complete the lining without a temporary water system and reinstate service the same day. This would require a boil notice be issued to residents until bacteria tests pass, which usually takes 24 to 48 hours. If we chose this method the city may want to distribute bottled water to the affected properties for consumption purposes. Staff will give a short presentation on the project and technologies. Below are some websites with information on watermain rehabilitation technologies: http://www.insitufonn.com/Water-Wastewater/piveLiningsWater http://www.agua-Pipe.com/agua-pipe-lining.php www.3m.com /water (Click on "Introducing 3M Scotchkote Pipe Renewal Liner" on the upper right of the page) Recommended Action: Discuss watermain rehabilitation technologies. Attachments: A. none