Agenda Packets - 1983/05/16 - Laserfiche WebLink

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CASE 120-03 Page 3 fronting Edgewood Drive for the possibly: ftauru installation of the gravity sanitary sewer main. Thin ca::umcut would not require an alLcraLion Lu Lhe dcve)opmunL pl:ms so-; submiLted with Lhe exception of the placement of this casement. Parking: 1) The Zoning Code requires 2!; parkinq spaces per unit with one being a garage, (10 total for a 4-unit building.) This require- ment has been met. 2) 9�- by 20 foot parking spaces are being provided. 3) Edgewood Drive is used as an on -street parking area for City hall Park during the summer softball season. The parking situation on Edgewood Drive should be discussed as a part- of the development review. Improvement of the curbing for traffic control may be necessary to keep vehicles on the driving surface and not on the boulevard in front of these homes. Cuncrete curbing is proposed for all parking and driveway areas. Drainage: 1) The developer io proposing 3 drainaUu area (900 contour - overflow to 907) along the rear property lines. During rainfall events water is proposed to flow, via a G inch drain tile system to a catch basin then connect up to the exiistinq 24 inch storm sewer pipe on Edgewood Drive by way of an S inch reinforced concrete pipe. The location of the 24 inch storm sewer as shown on the site plan is not in its correct location. The storm sewer is not in the center of Edgewood Drive but on City park property (see Exhibit 3). Initial review of the applicant's drainage plan and calculations indicates that the applicant proposes to detain only 50 percent of the storm water created by development-. This see:ns too low to meet Chapter 49A requirements. Staff estimates the existing 5 year, 24 hour runoff to be 2.35 acre-feet and the 50 year, 24 hour runoff to be 11.94 acre-feet, thereby requiring ponding of up to 9.59 acre- feet, less soil infiltration and discharge to drain tile and storm sewer. Discharge system appears to be adequate to meet Chapter 49A requirements but provisions should be made to better handle spring melt before ground thaw. The proposed drainage system should be a private system until it enters the Edgewood right-of-way. Staff recommends an additional manhole be installed near east right-of-way line and that applicant accept all responsibility for drainage system maintenance (example; cleaning of manhole sump at rear lot line). Approval should be contingent on meeting Chatper 49A require- ments. Setbacks: 1) Minimum setbacks fnr buildings and parking area have been met.