10-23-2002 Council Agenda - Laserfiche WebLink

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Honorable Chairman and Planning Commission October 4, 2002 Page Three 3. The watermain should be looped to Viking Drive from the cul -de -sac. A watermain tee and stub was installed during the Viking Drive reconstruction to accommodate this loop. It may be necessary to obtain an easement from the Church property or the property adjacent to the church to complete the watermain loop. 4. A valve should be installed at the connection to the existing watermain along McMenemy Street. All valves, bends, and fitting for the watermain should be labeled. 5. A hydrant should be added near the intersection of Preserve Trail and Preserve Court for fire protection. All hydrants should be placed 5 -feet behind the back of curb. 6. Only one catch basin is shown on the south curb line of Preserve Court while the north curbline has 4 catch basins. No typical street section is shown on the plans however, the street should be crowned down the centerline with a 2% grade to the curblines. This typical section would require an equal number of catch basins on both curblines. 7. The three easterly most lots are proposed to be serviced through the use of grinder pumps and pressure pipes. Currently all three discharge into a single pressure line. With this type of system, the failure of one service would require that all services be shut off for the repair. Therefore, the existing gravity sewer should be extended easterly and insulated until a minimum of 5 feet of cover exists. The individual pressure service lines should then be run separately into the gravity sewer, 8. A sanitary sewer service detail should be included in the plans. 9. The water from the catch basins on the Preserve Trail cannot discharge water onto Outlot D and private property. The storm sewer from the west pond should be extended to serve the catch basins on the Preserve Trail. 10. All sanitary sewer castings should be Neenah R -1733. The grates on all R -3067 curb inlets should be Type V. 11. The existing Mn /DOT storm sewer pipe running through the proposed development should be replaced with new reinforced concrete pipe within the limits of the development to help minimize the possibility of repair of this storm line in the future. Drainage Calculations: 1. The information submitted does not summarize the existing and proposed site. The drainage calculations should be resubmitted with a summary of the existing and proposed total discharge form the site for the 2, 10, and 100 year events. 2. The proposed drainage areas submitted do not include the rear yard drainage. Revised calculations should be submitted covering the entire developed site. 3. The calculations for the west pond show no outlet. The calculations should be revised to show the proposed outlet. 4. The calculations have hand written pond peak elevations but no calculations are included to show how these elevations were arrived at. Revised calculations showing the determination of the 100 yr HWL for the ponds should be submitted. 5. The pond outlet structures are incorrectly modeled in the calculations. The east pond calculations show a 6 inch orifice but there are hand written notes that describe a weir and rim elevation. The calculations should correctly model a multi stage outlet if that is the intent of the designer. Ltr 10 -04 -02 PingCom.doc