12-21-1994 Council Agenda - Laserfiche WebLink

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1) The storm sewer proposed between units 20 and 21 will be approximately 10 -15 feet deep. The closest units are shown to be approximately 10 feet from the center of this pipe. This is too close to allow for future repairs of the storm sewer line. The developer has two options: a) revise the building locations so that they are no closer than 20 feet, or b) place a steel casing around this section of the storm sewer (this allows future replacement without excavation). 2) Permanent utility easements must be dedicated. 3) It may be wise to place restrictions on the building of decks and other structures which could be built within the utility easements. 4) Many areas within the development are proposed to have slopes that will be steeper than 4:1, which is the steepest slope that can be easily maintained. Some are as steep as 2.5:1. We recommend that the grades be revised to meet City code or minimum maintenance standards (4:1). 5) The developer needs to analyze the effects that additional storm water from this development will have on downstream storm facilities and properties. This is particularly relevant with the proposed development because storm water from a 100 -year storm event flows to an entirely different area than storm water from a 5 -year event. In addition, will additional storm water from this site adversely impact wetlands? STREETS 1) The proposed 50 foot radius cul -de -sac to the north of Minnesota Street is smaller than the City's standard 60 foot radius for multi -unit housing. From an engineering standpoint, we recommend that the City require a 60 foot radii to provide adequate room for turning movements of school buses, snow removal vehicles and fire trucks. A 50 foot radius is workable, but difficult. As I understand, Masterpiece Homes is proposing a substandard cul-de -sac radius primarily in an effort to save a row of large trees to the east of the development. Because of the steep (3:1) existing slopes along the east edge of the development, it appears that a full 60 foot radius sac would require that a much Iarger area be cleared, taking numerous mature trees. The City's position regarding the protection of existing mature tree stands will be the deciding factor in this issue. 2) The possibility of extending Minnesota Street to Viking Drive in the future, eliminating the awkward intersection of Rice Street and Viking Drive, will be negated with approval of this development concept. We recommend that this issue be considered before approval. cc: Dave Harris Kathy Glanzer £0'd '399V '8 00b1S9N09 Page 29 TT2T 929 eT9 92:01 17661 -40 -2T