5.5. - 5.8. SR 11-01-2004 - Laserfiche WebLink

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C. Preliminary Utility Plan . The water system is shown to be connected at J ackson Avenue at the southeast comer and the northeast comer. Both connections should be to the existing 16-inch watermain along J ackson Avenue and not to any smaller watermains. This will ensure a good flow of water, should there ever need to be water to fight a significant fire in the development. The two private drives which extend to the westerly plat line need to have the watermain looped. It appears that the best way to loop them would be to connect the two together. . The sanitary sewer system is proposed to connect to the existing sanitary sewer system in 6th Street as it extends from Jackson Avenue to the Boys & Girls Club. It is unclear whether this existing sanitary sewer is an 8.inch diameter line. It could be a smaller-sized diameter sewer line intended to serve the Boys & Girls Club. If in fact the existing line is less than 8 inches in diameter, the proposed sewer system will need to be connected to the main in J ackson Avenue. . . Each individual unit will need to have a separate sewer and water service. . The street section dimension should be shown as 28 feet face-to-face. D. Drainage Calculations . Time of concentration for Subcatchment 3-E and 7.P are too high. These need to be re-checked and the calculation verified. . The west pond has an emergency overflow that flows into the Lions Park. . Since the project proposes to disturb more than one acre of land, and NPDES Construction Permit will be required from the Minnesota Pollution Control Agency. As part of this permit, a Storm Water Pollution Prevention Plan (SWPPP) must be completed. The City has developed a generic SWPPP which can be adopted for compliance with the condition of the NPDES Permit. . The project proposes to create more than one acre of new imperious surface and therefore, must meet ponding requirements of the NPDES Construction Permit. The developer's engineer should be sure to include these calculations along with a narrative of the requirements and how they are being met in the proposed drainage plan. . This project has been before the Technical Evaluation Panel (rEP). The TEP has approved the filling of the ditch and the creation of the wetland shown in the northwest corner of the site. A protective drainage and utility easement will need to be provided over the created wetland. If you have any questions regarding any of these comments, please call. Sincerely, ~ Ter~~ S:\PLANNING\Case Files\2004\P 04-16 Jackson Ave Vilb.s\10 5 04 Engineers memo.doc