02/09/2005 P&Z Packet - Laserfiche WebLink

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Oakwood View Page 3 January 20, 2005 City of Lino Lakes, Minnesota • the emergency overflow location. Any additional RCWD freeboard requirements over onsite wetland basins must also be met. 3. Revised Hydro -Cad calculations have been received and comments are as follows: a) The existing conditions models an area of 737,930 square feet, while the proposed conditions models an area of 726,909 square feet. Thus, 11,021 square feet is missing for the proposed calculations and should be accounted for. b) The calculations utilize infiltration characteristics that use NRCS Soils Type "A ". Existing condition curve number computations use NRCS Soils Type "B ". The existing soil types utilized must be consistent. If the existing soils are Type A, then existing condition computations must use Type A soils. Proposed condition numbers shall use Type B soils in all disturbed areas where Type A soils exist. Otherwise, if Type B soils do exist, the infiltration rate will need to correspond to Type B soils accordingly. According to the Rice Creek Watershed District (RCWD) stormwater infiltration packet, this rate is 0.25 in. per hr. Revised calculations must be provided as the results are critical for assuring that low floor building requirements are met. 4. Per the previous review, the City received a Conditional Approval Pending Receipt of Changes (CAPROC) from RCWD. All remaining conditions of the CAPROC must be completed as required by RCWD. 5. An NPDES Phase II permit has been forwarded to the MPCA. All requirements of the Permit, including the submittal of a Storm Water Pollution Prevention Plan (SWPPP) to the City, shall be completed prior to engaging in grading activities. Utilities 1. Previous reviews expressed a concern with regards to adequate pressures and circulation for the long dead end line to the Church and enabling facility. In the event that additional pressure may be required, the applicant shall be responsible for any boosters as may be necessary. Insulation must be provided for any water and sewer pipe where a minimum 8 feet of cover cannot be attained. 2. All trenches (including services) shall be backfilled and compacted and meet 100% maximum Standard Proctor Density in the upper 3 -feet from finished road elevation, and 95% maximum Standard Proctor Density below the upper 3 -feet. 3. A minimum of two feet of cover over storm sewer pipe is desired. 4. At least 2 gate valves must be provided on the new 8 -inch diameter watermain. It is suggested that they be provided at the northerly connection point (Oakwood Lane), and on the south side of the tee at the end of the new Oakwood Lane street extension.