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' Moon Marsh <br />Drainage Calculations Review <br />City of Lino Lakes, Minnesota <br />August 3, 2007 <br />08/03/07 The Manning's n value for the existing culvert outlet of wetland #1 (pond 11P) should be <br />replaced in the model with an appropriate value for corrugated metal. <br />8. Clarify why the watershed area flowing to the east under proposed conditions ( subcatchment 6S) <br />has a longer time of concentration than under existing conditions (subcatchment 7S). <br />08/03/07 This item has been addressed. <br />9. Provide a berm north of the low point of the ditch located on the north side of the proposed road at <br />station 6 +50 that will fully contain the 100 -year storm event. Label the elevation of the top of berm <br />on the Grading Plan. <br />08/03/07 This item has been addressed. <br />10. Show the location of soil borings 5 - 7, and label all soil boring numbers on the Grading Plan. <br />08/03/07 This item has been addressed. <br />11. Clarify how the off -site watershed boundary to the north was determined. <br />• 08/03/07 This item has been addressed. <br />12. Label the Rice Creek floodplain elevation of 887.5 on the Grading Plan. <br />08/03/07 This item has been addressed. <br />13. Submit a copy of the NPDES permit for the City's records when available. <br />14. Approval from Rice Creek Watershed District (RCWD) is required. Submit a copy of the RCWD <br />Permit when available. <br />Additional Comments (08/03/07) <br />• <br />15. Revise the 6 -inch drain tile invert elevation for the north filtration basin from 887.5 to 888.0 <br />on the Grading Plan and HydroCAD model to be consistent with RCWD requirements and <br />the cross section detail on Sheet 7. <br />13810.002 <br />