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• • Holiday Stationstore Page 2 March 2, 2007 Drainage Calculation Review City of Lino Lakes, Minnesota The following are minor plan, calculations, and drafting corrections that must be addressed prior to final approval: 1. Include a detail of the pond outlet structure on the Plans. 2/14/07 This item has been addressed. 2. Include a `rip -rap at flared end section' detail on the Plan. 2/14/07 This item has been addressed. 3. Show the location of erosion control blanket on the Plan. 2/14/07 This item has been addressed. 4. Indicate the pipe size, slope and invert elevation of the existing pipe the discharges to the 35W right - of -way on the Plans. 2/14/07 This item has been addressed. 5. Label the inverts of all flared end sections on the Plans. 2/13/07 This item has been addressed. 6. All City - maintained storm sewer, including pond outlet structure pipes, are required to be a minimum of 15 inches in diameter. 2/14/07 This item has been addressed. 7. The storm sewer design may change due to modifications of proposed curve numbers based on comment 3 (significant issues) above. The storm sewer design will be reviewed when the updated calculations are re- submitted. 2/14/07 The storm sewer was designed using HydroCAD. Pipe capacities were checked against inflow values determined in the model, and there appears to be sufficient capacity to convey the 10- year storm event. This item has been addressed. 8. Indicate the overland emergency overflow location and elevation of all ponds and parking lot/road low points on the Grading Plan. Low openings are required to be a minimum of 1 foot above the emergency overflow elevation. 2/14/07 Indicate the overland emergency overflow location and elevation of the stormwater pond and infiltration basin. 3/2/07 The overland emergency overflow elevation of the stormwater pond and infiltration basin on the Grading Plan is incorrect. 9. Provide a cross - section detail of the infiltration basin on the Plans that includes information such as the depth and type of soil mixture. 2/14/07 This item has been addressed. • 10. Label the high water level of the infiltration basin on the Plans. 2/14/07 This item has been addressed.