6.5. SR 09-22-1997 - Laserfiche WebLink

Home Browse Search

Howard R. Green Oompany QQNSULTING ENGINEERS August 21, 1997 File: 801140j-0240 Formerly MSA Consulting Engineers Mr. Steve Ach City Planner City of Elk River 13065 Orono Parkway P.O. Box 490 Elk River, MN 55330-0490 RE: ALTERNATIVE LEARNING CENTER SITE PLAN REVIEW Dear Mr. Ach: As requested we have reviewed the Alternative Learning Center (ALC) Site Plan that was submitted by Bogart, Pederson, and Associates. Based upon our review and comments received at the staff review meeting, we would offer the following comments: Sanitary Sewer service for the proposed ALC Building is available in School Street. The sewer is relatively shallow. The invert of the manhole, of the intersection of School Street and Proctor Avenue is 900.47. The invert of the manhole at the west end of School Street should be verified to insure the gravity sewer can be achieved from the new building and that the sewer line does not conflict with other utilities in the area. In meeting with the fire chief, he would like to have an additional hydrant located at the north side of the building. The watermain that currently exists on School Street is a dead end line. By extending this to the north side of the building, there will be two hydrants located on a dead end line. This is against municipal utilities' policy. Wherever possible the municipal utilities' policy is to loop watermains. Therefore, consideration should be given to looping the watermain back to the existing watermain on Proctor Avenue, north of the single family lots adjacent to Proctor Avenue. Another issue that was raised during the staff review, is the existing hydrant along School Street is in disrepair and should be replaced. This work should coordinated with Bob McCartney of the Elk River Municipal Utilities. o The site generally drains from the northeast to the southwest. The existing parking lot as shown will drain overland almost into the proposed ALC Building. Storm sewer should be provided in the parking lot to pick up storm drainage run off. There is an existing pond located southwest of the proposed building. We assume that this is the area that will be utilized for storm water run off quality control. Drainage calculations will need to be provided showing the amount of run off and ponding requirements according to Best Management Practices. Outlet from this pond could go to the intersection of School Street and Proctor Avenue, there is existing storm sewer at that location. The southwest corner has a catch basin with an invert of 897.27 and a 15" pipe leading across the street to an existing 24" pipe. Storm drainage from that pipe system flows to Lions Park and eventually to the Mississippi River. 1326 Energy Park Drive · St. Paul, MN 55108 · 612/644-4389 fax 612/644-9446 toll free 800/888-2923