08-24-11 Council Agenda - Laserfiche WebLink

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£LctAlHC ilss0a111ts 1RUc nORIII August 18, 2011 File: 120152E -0240 Honorable Mayor and Council Members City of Little Canada 515 Little Canada Road East Little Canada, MN 55117 -1633 RE: TH36 / RICE STREET PARK & RIDE CITY OF LITTLE CANADA Dear Mayor and Council Members: We have reviewed the 90% submittal for the Rice Street Park and Ride proposed to be constructed in the northeast corner of the Rice Street and County Road B intersection. The Park and Ride facility would provide for 270 parking stalls and a bathroom facility for bus drivers only. Vehicle access to the Park and Ride would be from County Road B. The submittal consisted of a soil boring report, stormwater narrative and calculations, and 90% complete construction plans. Based upon our review we would offer the following comments for Council consideration. Plans 1. We have provided the standard City construction details to the Engineer and they should be updated in the final plan set. 2. All storm water entering infiltration areas must be pretreated for sediment removal prior to discharge to the practice. Sumps or sediment removal structures should be added to accommodate this requirement. Sumps are currently shown for some of the structures, but should be added at the last structure prior to entering the main pond and the underground retention system. It is unclear if the second structure from the east on the south side of the tree swale is directed to the swale or the underground retention system. If it is directed to the swale it should also have a sump shown. 3. Seeding is proposed for the large pond slope and we had previously recommended plug plantings be utilized to ensure sufficient establishment since the pond areas will receive stormwater shortly after construction. Metro Transit has proceeded with seeding and this area should be monitored for sufficient turf establishment before the project is closed. A maintenance agreement for the turf establishment and the continued maintenance of the infiltration practices should be executed with the City. We would recommend a format similar to the Ramsey Washington Metro Watershed Districts agreement. Ltr•081811 -CC 10062 Flanders Court NE, Blaine, MN 55449 - Phone: (763) 780-0450 - Fax: (763) 780-0452 61