11/09/2005 P&Z Packet - Laserfiche WebLink

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• • • Mr. Michael Grochala November 2, 2005 Page 2 actions to match the existing ground along with the required seeding and erosion control measures. The future phase plans will then show the earthwork required to match the Phase 1 parking. 7. What provisions are being made for temporary curbing where the future underground parking entrance is at the building near the north entrance off of Village Drive? Some sort of curb will be required to contain the runoff that will already be traveling in the gutter flow line. 8. It is recommended that spot elevations be revised on the curb at the parking entrance drive aisle just south of Catch Basin 3 to demonstrate a high point or ridge to contain runoff flowing from the parking area into the main drive aisle, then north to Village Drive. 9. Are any trees being impacted by the grading operations on the south and southeast sides if the project? Impacted trees should be shown on the plans. 10. According to the submitted calculations, there is a very large amount of runoff being directed to CB 10 and CBMH 4 (9.65 cfs). Utilizing Neenah orifice flow calculations, these two Neenah catch basin grates will not be able to handle this flow, resulting in ponding at this location. It appears a significant amount of flooding of the main drive aisle would result in a 10 -year storm event. Additional storm sewer catch basins should be utilized in the parking lot to collect some of this runoff before reaching the southern end. 11. Coordinate with SEH on the exact location of the storm sewer chamber system. This will affect the location of STMH 5 in the median. 12. Roof drain locations for the YMCA building should be shown on this plan. 13. The amount of runoff flowing into the basin at FES 11 is not shown. It is recommended that rip rap, or some other acceptable method of erosion control, be placed from FES 12 all the way to the base of the slope at the wetland to prevent erosion from the discharge out of FES 12. 14. Show pipe sizes on the plan for the storm sewer run from CB 3 to the existing manhole on the north end of the site. 15. Spot elevations should be shown at all major building corners. 16. Storm Manhole 5 should have a 2' sump in it to aid in sediment collection before runoff enters the storm chamber system. 17. Pond 3 has a normal water line (NWL) of 888.4 and a high water line (HWL) of 889.7 after final design of the public improvements. Please change Pond 3 information to reflect this. 18. When changing pipe sizes across a manhole or catch basin, match crown elevations, if at all possible, to preserve hydraulic grade line instead of matching invert elevations. Preliminary Utility Plan (C1.02) 1. Coordinate with SEH to show the revised water main through the YMCA site. 2. Note that the sanitary sewer near SSMH 1 will need to be installed under existing water main. 3. The 6" and 8" water main services should have 45° bends near the building rather than the 90° bends shown. 4. Coordinate the water main connections on Village Drive with SEH to ensure they are completed before bituminous surfacing is placed. Short Elliott Hendrickson Inc., 1701 West Knapp Street, Suite B, Rice Lake, WI 54868 -1350 SEH is an equal opportunity employer 1 www.sehinc.com 1 715.236.4000 1 715.234.4069 fax