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<br /> ~\ ~, <br /> \\\6 <br /> . <br /> MEMORANDUM <br /> -------------------------------------------------------------------------- <br /> Date: March 27. 1987 <br /> To: Arden Hills Council <br /> From: Robert W. Raddatz, Public Works Supervisor <br /> Re: Storm Sewer in Townhouses North <br /> -------------------------------------------------------------------------- <br /> There is a short section of storm sewer in the Townhouses North that is <br /> being forced out of the ground by the frost. The sewer line is only three <br /> to four feet deep in this location, and frost is very hard on a pipe that <br /> is this shallow. The pipe is about 25 feet long going from one side of <br /> the street to the other. The pipe is breaking away from the catch basins <br /> on each side of the road. The pipe is composed of concrete sections of <br /> five feet each. <br /> I am recommending that we dig out the old pipe, then remove an extra two <br /> feet of clay and replace with sand, lay the pipe back in, and fill the <br /> trench with sand. We would use Class 5 on top of the sand to a depth of <br /> . 6" to 8". A 4" asphalt base would then be added to that. If we follow <br /> this procedure, we should eliminate frost heaving. <br /> I will be back to the Council in April with a cost estimate on this. <br /> . <br />