03/09/2011 P&Z Packet - Laserfiche WebLink

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Review Memo Page 2 Lino Lakes Commercial (Lake Drive and Main Street — Gas Station) March 1, 2011 4. The grading and drainage plan must address how drainage works with the existing storm sewer in the northwest and south east corner of the properties. StormWater Drainage Report: 1. On site soil types must be addressed and calculations shown to address the infiltration rate of the soils to ensure a functioning infiltration basin and correct infiltration basin sizing. 2. The pipe at the north entrance along Main Street should be included in drainage calculations. 3. Rainfall rates for the 2 -year storm should be approximately 2.8 inches over a 24 hour period. 4. Maximum allowable pipe flow is 3 feet per second this rate is exceeded during a 100 year storm event in the 18" pipe downstream of the infiltration basin. 5. Drainage easements must be placed over all storm sewer and infiltration basins. 6. Some drainage on the north side west of the entrance off Main Street appears to flow north to the pipe in the Main Street ditch. Existing drainage area 2 and proposed drainage area 3 should be reviewed and corrected if necessary. 7. Applicant should review the volume control requirements of the Rice Creek Watershed District Rule C for the infiltration basin design. 8. Applicant must obtain a Rice Creek Watershed District permit and submit to the City prior to construction. Landscape Plan: 1. One or two trees appear to be planted within the infiltration basin. An appropriate species for this location should be planted. • •