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<br /> I <br /> ~e CITY OF ARDEN HILLS <br /> MEMORANDUM <br /> I DATE: July 2, 1996 <br /> I TO: Brian Fritsinger, City Administrator <br /> , <br /> I FROM: Dwayne Stafford, Public "Vorks Superintendent Yr <br /> SUBJECT: Oak Avenue Sewer Repairs <br /> I Back!!round <br /> The Arden Hills Public Works Department had earlier requested the City Engineer to televise <br /> I any sanitary sewer line which lays under a street scheduled for reconstruction. Upon completion <br /> of this process on the streets being re-constructed in 1996 it was determined that Oak A venue has <br /> I 10 areas where the pipe has failed. Two of these are related to improper installation of service <br /> laterals, and the others were probably caused by poor bedding in the pipe area. <br /> I Estimated Costs for Repair <br /> Mr. Greg Stonehouse has solicited bids from the three companies in this area who specialize in <br /> sewer repairs made from above ground. Only two of the three companies contacted by Mr. <br /> Ie Stonehouse submitted proposals to make the necessary repairs. Those companies were; <br /> Infratech Infrastructure Technologies Inc. <br /> I Brooklyn Park, Minnesota at $13,934.00 <br /> Buchen Environmental Services Inc. <br /> I Chaska, MN at $17,535.00 <br /> Repair Methods <br /> I Both Infratech and Buchen pull the repair materials into place with cables and use a TV camera <br /> to align the repair precisely. <br /> I Infratech uses a foam backed sheet of stainless steel which looks similar to a piece of stove pipe. <br /> This is called a repair link and is available in up to three feet lengths. These links can be placed <br /> I end to end for longer repairs. After positioning the repair link an inflatable device placed within <br /> the repair link is pressurized thus squeezing the repair link tight against the inside of the pipe <br /> where by design it is locked firmly in place. This seals out any soil or water infiltration. The <br /> I repair link is approximately 1/2" thick, but beveled on the ends. This creates a 1" loss in pipe <br /> diameter which may affect cleaning accessories designed to fit the pipe closely. <br /> I These repairs have been known to fail on occasion as the link pipe has a tendency to slip within <br /> the pipe, again leaving a potential problem area unprotected. <br /> ~ <br /> I <br />