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HomeMy WebLinkAboutItem 05.b❖ Water Main Installation LAKEVILLE PUBLIC WORKS Christopher Petree, Director May2012 The Engineering Division, working with a developer, recently completed the installation of a new high pressure water main extension to expand residential development east of the downtown area. The unique thing about the water main was that a portion of it was installed from CSAH 50 to Hartford Way and didn't involve cutting a trench across sensitive landscape areas. The 2000 feet of pipe was pulled underground using directional boring or horizontal directional drilling. This is a steerable, trenchless method of installing underground pipes, conduits, and cables in a shallow arc along a prescribed bore path by using a surface launched drilling rig, with minimal impact on the surrounding area. The pipe was pulled in two segments and joined in the middle. Holes at either end of the process were used to feed and pull the pipe through. The process will work with just about any pipe; this installation used a flexible 8 -inch high density polyethylene pipe with each of the pieces joined by heat fusion. This type of joint is proof. The major segments of the pipe were connected with metal flanged connectors. The installation of this water main provides two irrigation services in Aronson Park and domestic water service to a park building. leak 1 ❖ Storm Sewer Cleaning The Utilities and Streets Divisions teamed up to clear a plugged storm sewer on Jackpine Trail. The plug was such that some storm water was able to get through, but it was enough to slow the drainage of collection ponds upstream. Using the jetter on the Vactor, Utilities staff entered the system at the first manhole downstream from the plug. The jetter, with a special nozzle, pushed up the pipe by 2000 psi water pressure pushed at the plug in an attempt to penetrate or dislodge whatever was restricting the water flow. After much work, the flow was improved sufficiently to discern that the problem was a small log jammed into the pipe which created sediment build up behind it. When that log was removed, a second log was found under some of the sediment. Using the crane from the catch basin repair trailer, Streets staff looped the cable around the second log and pulled it out of the manhole. With the removal of the second log and the remaining sediment, the storm sewer was restored to normal flow and the upstream ponds were able to release some of the water from recent rains. ❖ Boulevard Mowing The City has approximately 85 miles of City owned boulevards and rural roadway ditches that it mows every year. The primary purpose is to maintain a clear space along the edge of the roadway for the safety of motorists and pedestrians. Keeping the grass and weeds 2 cut down along the side of the road improves sight lines for motorists around corners and at intersections. It also contributes to the aesthetics of the City and presents a groomed look to the rural road segments. Mowing is completed twice per year during the summer using a tractor with a side and rear flail mower attachment. 3