pf_02996 - Laserfiche WebLink

Home

STORM SEWER A significant amount of building and parking lot surface currently surface drains north of the existing building. The drainage area could be on the order of 6 to 7 acres, depending on roof patterns and adjoining properties for which we did not have data. The surface drainage will be blocked by the proposed addition. Runoff will be forced to a low point in the parking lot west of the expansion with anticipated grading. A large inlet (or group of inlets) can be installed to receive the runoff. Very little pervious surface is proposed to be altered so no on-site ponding requirement is anticipated. Two alternatives have been identified for a pipeline alignment to convey runoff from the site. These are shown on an attached sketch. A1i~nment "A" - Follow Sanitary Sewer Reroute This alignment is approximately 840 feet long, d~pending on the final layout. The advantage includes no limit on discharge capacity and minimal involvement with neighboring properties. Disadvantages include space constraints for construction and possible conflicts with the sanitary sewer. Alignment "B"- North to Rose Place City records indicate an easement may exist across the neighboring parcel to the north. The easement existence, type and involved parties were not confirmed. The alignment is about 750 feet long. The advantages include less cost, fewer space constraints for construction and less underground congestion around the expansion. Disadvantages include crossing the proposed sanitary sewer and coordination with neighboring parcels and the City. A discharge rate limit may apply depending on the capacity of the Rose Place Storm Sewer. Both alignments would require similar restoration. There may be a way to reduce pavement restoration for alignment "B" by placing the line west of the existing parking lot. OTHER ISSUES I met with engineering and planning representatives of the City of Roseville. A photocopy of their cards is attached. At least two council actions are required prior to construction. One is approval of a "Minor Subdivision" which legally combines the two lots into one parcel. The other is the vacation of the old sanitary easement and granting of the new easement. This can be done in a combined action. The next available meeting is April 27, 1998. The application deadline is March 9, 1998.