Agenda Packets - 1987/08/24 - Laserfiche WebLink

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MEMO TO: MAYOR AND CIT!' COUNT r FROM: CLERK -ADMINISTRATOR DATE: AUGUST 24, 1987 SUAJECT: MAN HOLE EXTENSION AT 2741 ARDAN AVENC� As you recall, the residents at 2741 Ardan Avenue recently appeared before you at an agenda session regarding the replacement of a 6 foot high concrete pipe over the manhole in their rear yard. At that time, these residents questioned the purpose for which this pipe was placed there and the serviceability of the pipe. Attached please find a memo from the City's consulting engineer, Dan Boxrud, responding to my request that he review the matter after a field inspection with Public Works Foreman Rose and myself. Dan makes the comment that the previous structure adequately restrained the Lack -up of storm water and this statement will be refuted by the residents, however, it should be pointed out that the reason the pine did not hold back water was that the concrete frame on which it was placed had been broken out by the residents in order to allow the water, to redrain into the catch basin after the major storm water flow had subsided within the underground pipe rystem. The proposal -at this time is to place a 4 foot manhole section over the existing catch basin with a small :sole in the bottom having a modified "check valve" over it to restrict the flow of the water into the yards through this hole. It will essentially allow for the water to back up into the pipe closing the check valve during its upward flow and prevent water from getting into the yards in this area. Once the water has subsided the check valve will open and any water collecting in the yards durinq the storm will be able to drain into the pipe. Mr. Boxrud indicates, based on this concept, that he feels the proposed pipe extension will function as intended. Staff would request direction in this matter. DFP/mjs Attachment: