07/09/2003 P&Z Packet - Laserfiche WebLink

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• • • Ravens Hollow Review Page 3 June 30, 2003 City of Lino Lakes, Minnesota Grading, Drainage, and Erosion Control Plan and Drainage Calculations The following comments are provided as part of our review of the grading and drainage: 1. The grading note "Silt fence to be maintained during grading" shall read "Silt fence to be maintained until approved removal by City Engineer." 2. The grading note "Adhere to minimum opening or basement elevation for each lot" shall read "Adhere to minimum opening and basement elevation for each lot." 3. The grading note "Ponds and wetlands may be ... -soil source & material to approved by City Engineer" shall read "Ponds and wetlands may be ... -soil source & material to be approved by City Engineer." 4. The grading note "Developer shall use Tufturf..." shall read "Developer shall use Tuffturf or equivalent..." 5. A storm manhole must be added between STMH -20A and FES -21, so that FES -21 can be aligned 90 degrees to the wetland edge. In addition, it appears that there is a conflict between the two storm sewer lines at this location. A review of the storm sewer design at this location is therefore recommended. 6. In addition to the typical single - family lot detail showing perimeter drainage and utility easements, the easements should also be shown on the plat itself for all lots. In addition, it is strongly recommended that the City require a wider side lot easement (10 feet rather than 5 feet) where the proposed storm sewer is planned. Drainage and utility easements shall also be shown on the plat over all storm sewers not in public right -of -way or pond drainage easements. 7. Existing and proposed 100 -year flood elevations must be submitted for the wetlands. The proposed flood elevation shall be shown on the Grading Plan. 8. Existing and proposed curve numbers are acceptable. 9. Supporting computations are needed for all "Direct Entry" Time of Concentration values. 10. Pond P1 is modeled as twin 12 -inch pipes, but the grading plan only shows one 15 -inch pipe. 11. Storm sewer computations must be submitted. 12. Approval from Rice Creek Watershed District (RCWD) is required. As part of the March 2003 submittal, a permit application and plans were reviewed by the RCWD. At that time, the RCWD had issued a conditional approval pending receipt of changes and outstanding items further described in Permit Application No. 03 -019. The application also contained terms and conditions regarding a Wetland Replacement Plan. An updated review and approval by the RCWD based on the most recent plan set must be provided.