09-28-05 Council Minutes - Laserfiche WebLink

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MINUTES CITY COUNCIL SEPTEMBER 28, 2005 4. Hydrant valves should be placed 2'6" from the hydrant. 5. The Mn/DOT storm sewer pipe should be shown in both plan and profile view. Due to the age of the storm sewer pipe the City should require that the storm sewer pipe within the development be replaced with reinforced concrete pipe. This was previously agreed to by the Developer but is not shown in the final plans. The Developer should also provide comment from Mn/DOT as the replacement material and size and document approval from Mn/DOT for the work. 6. The water main must be looped thru the entire development up to wafer main in Viking Drive. This was also a previous requirement that was agreed to by the Developer but is not shown on the final plans. 7. It appears the elevations of STM CB-18 are inaccurate. The Developer's Engineer should verify all elevations and submit new corrected plans prior to any construction. 8. The City had requested and the Developer had agreed to treat the storm water from Preserve Trail in the west storm water pond. This submittal shows the storm water being directed to the east pond. In working with the Developer on what staff felt was an acceptable wall height east of Preserve Court the high point of Preserve Trail was moved from the intersection of Preserve CourC farther to the west. If the City were to require that the original agreement to treat Che storm water in the west pond be followed, it would result in the Developer installing longer storm sewer runs at deeper depths to serve Preserve Court. Given that the treatment and ponding requirements for the storm water from Preserve Court would be the same whether directed to the east or west pond, we would recommend that the storm water from Preserve Court be allowed to be directed Co the east pond. A benefit of this to the City is less storm sewer to maintain at shallower depths. 9. The existing sewer and water service to the house being removed off of Viking Boulevard should be removed and abandoned at the property line. 10. The Developer has indicated that the Williams/Magellan pipeline will be lowered to allow for construction of Preserve Court. All relocation requirements and plans should be provided to the City for their review and approval as they may relate to the proposed and future improvements within the right-of-way. Storm Water Calculations 1. The drainage area map currently has the existing and proposed areas on the same map. They should be separated into two exhibits and contours should be included. The boundaries for the subcatchments appear to be the same for the existing and proposed conditions. However, the HydroCAD results have different areas listed for Che two conditions. Any discrepancies should be resolved. In addition, the proposed boundary for Subcatchment Dev-North appears to be inaccurate. The boundary is shown as the north edge of the roadway. The grading plan indicates thaC the front of the houses and the driveways will drain to the roadway. 2. The time of concentration appears low for the Ex-North Subcatchment. The area is larger than some of the other subcatchments; however the time of concentration is lower. This should be reviewed and corrected or documentation provided as to the shorter time. 3. The time of concenh~ation for each area remains the same for the existing and proposed calculations even though the areas and curve numbers are different. This should be reviewed and corrected. 29