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MWNE50TASSII7 t. EL11 dBd0�12•'. <br />[NGMlO7ltlARCNRiCiSIPIANNfPS <br />2?7 EASRI7RE CANAL';AD, 57 PAU4 c V� <br />December 7, 1987 RE: MOUNDS VIEW, MI <br />JACKSON AND GROBE G?• <br />SEH FILE: 87154 <br />City of Mounds View <br />2401 Highway 110 <br />Mounds View, MN 55112 <br />Attn: Don Pauley <br />Dear Don: <br />You and Gary Kardel were interested in the possibilityRoad OfI <br />to <br />extending a storm sewer from <br />Grober iStreetutsonasf to udrain this <br />nty <br />and Jackson southerly intersection and be able to fill the ditch. To make this <br />determination, we have reviewed the following: <br />1. T'ie construction plan for County Road I. <br />2. The drainago boundary to County Road I per TKDA, the <br />County's consulting engineer of the County Road I project. <br />3. The city's topographic map to dete-mine the drainage area to <br />the intersection of Jackson and Grobarg. <br />vey the <br />we f ound thatfrequency stormitolCountylRoadble tI by next ndingfaystormrsewerain <br />the east ditch of Jackson. The concrete pipe and apron leading <br />into the catch basin at the southeast corner of County Road I and <br />ved. The <br />ed <br />tocbe flattenedeedttfrom the ocatch basin concrete tothe southeast so e soas <br />to prov-de depth as possible. A <br />orm <br />catch basins h t <br />would need to be installed at this sewer manhole Fifteen <br />inch plastic pipe would then need to be extended southerly at a <br />0.4$ grade to Groberg Street. Catch basins would need to be <br />installed at both the northeast and southeast corners of the <br />intersection of Jackson and Groberg. Ideally, a third catch <br />basin would be installed <br />nthe sside of the street <br />the <br />intersectionnow overflowsthroughtheapbrtm3nt buildinghere parking <br />lot. <br />If a storm sewer system was installed as described, it would �need <br />eed <br />to flow under a "head" in order to convey the i1VW <br />year +' <br />frequency storm. The 10.8 acre drainage area will generate about <br />9.4 cfs, which will require that the water in the catch basinb at <br />Groberg and Jackson will need to build up to within about a foot <br />of the surface in order to force its way Lhroug.. <br />his should nothbe a"problemplastiC <br />pipe. With properly casketed pips <br />Going to a larger pipe size does not significantly help the <br />situation. <br />CHIFSFALLS, <br />51 CAUL WISCONONSIN <br />SHORT <br />PENDOIC15nN INC MMNE50U <br />ILY.C.. <br />