Minutes - Public Works Committee - 06/15/2004

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existing line is 27". This was known and it was planned that the line would need to be changed to 3D" pipe in the future. Inspection of the line under Ramsey Boulevard indicated that the pipe had a 6" sag between manholes. Ramsey Boulevard will be reconstructed in 2005. The contractor had to dewater to install the new pipe for Ramsey Town Center that connects to the existing manhole. The contractor has the equipment and pipe onsite at this time. It seems logical to replace the pipe under Ramsey Boulevard now while the contractor is onsite and before the street is reconstructed rather than come back and dewater in 2005 for a short length of pipe. There is additional 27" pipe on the east side of Ramsey Boulevard that will need to be replaced in the future. Replacing this section of pipe now will eliminate the need to dig into the newly reconstructed street. He noted there was a problem related to grease from Burger King coagulating in the pipe due to Burger King's neglect of the grease traps. Staff cleaned out the grease and Burger King has been billed for this. Chairperson Zimmerman questioned if increasing the pipe from 27 inches to 30 inches would be large enough. He inquired if a 36-inch pipe should be used instead. Assistant Public Works Director Olson replied this pipe connects into a 3~-inch pipe down stream, and a bigger pipe would not allow any more flow than the 3~-inch pipe it connects to. Councilmember Cook inquired of the projection for 3~-inch pipe to the east. Assistant Public Works Director Olson replied it depends on how fast everything to the north and west of Town Center develops. The need could be developed 10 or 20 years from now. It does not just include vacant property, but also existing lots that are subdivided. The other thought on the grease issue is that currently Burger King is the only property on that line and there is not really a great deal of flow going through the pipe. When there are more properties using the pipe, that flow will help in that situation to get it downstream. Staff has made it clear that they want Burger King's grease traps cleaned regularly, as it could create substantial issues in the future. If this had not been caught now it would have backed up the entire pipe. Councilmember Elvig asked if there are standards regulating what can be contributed into the sewer. He noted in the Industrial Park in Anoka they are not allowed to put any type of oil in the pIpe. Assistant Public Works Director Olson .replied Burger King does have a grease trap, it just was not maintained properly. Chairperson Zimmerman inquired about the cost difference between a 3~-inch pipe and a 36-inch pIpe. Assistant Public Works Olson replied there is only approximately a ten-dollar difference per foot. They are talking about 90 feet and there would be approximately a one to two thousand dollar difference. Chairperson Zimmerman asked if this work will shutdown Ramsey Boulevard again. Public Works Committee/June 15,2004 Page 4 of 17