12 PCSR 03-23-1993 - Laserfiche WebLink

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P Plat, CherryHill Bluffs 2nd Page 3 March 19 , 1993 The majority of the drainage from this plat ends up in a large pond labeled Outlot B. This pond has been identified by the City as having the potential to be a regional storm water retention pond. Although the City storm water management policies have not been established, staff feels it is appropriate that this pond be in City ownership. Staff also concurs with Mr. Maurer' s comment that an outlet to the pond is necessary. This would be a metered outlet, which slowly releases storm water to control the ultimate level of the pond. This is important to make sure appropriate lowest floor elevations for adjacent dwellings can be established. The construction of the storm sewer is proposed to take place above the ordinary high water mark of the pond labeled Outlot B. Therefore, permits from the Army Corps of Engineers or DNR should not be required. This will be verified prior to final plat approval . NOISE MnDOT' s concern with noise levels from the highway to adjacent dwellings is well founded. MnDOT will be conducting a study on noise levels which City staff should receive in two weeks . The developer is proposing to build a berm with plantings adjacent to the right-of-way of Highway 169 to reduce noise levels . 411 Property adjacent to Highway 169 also lies within a United Power Association easement. Clearance from UPA to construct a berm will be required of the developer. GASL LINE EASEMENT There is a 75 foot wide Northern Natural Gas Company easement that runs diagonally across the property included in the plat. This easement contains a high pressure gas line. Past mineral excavation on this site avoided the area that contained the gas line. The gas line is now at the high point of the land. This affects the construction of improvements for this plat as follows : 1 . Roads The gas company will require minimum cover from the road to the gas line. I believe this is four feet, but will need to be verified. 2 . Water Lines Water lines do not have to stay at a specific grade so they can readily be placed under a gas line. 3 . Storm Piping Storm piping grades will be limited by the location of the 111 gas line. However, this situation is workable.