09/14/2005 P&Z Packet - Laserfiche WebLink

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• • • Mr. Michael Grochala September 2, 2005 Page 2 5. Approximately 45 feet of the sidewalk between the northwest side of the building and the parking lot has a slope that is graded toward the building. 6. According to the detail provided on Sheet C2.1 and the contours and spot elevations on Sheet C3.0, it appears the concrete seat wall will reach a maximum height of approximately 1.3 feet near the steps and decrease to almost 0 feet near the main north entrance, with over half of the length of the wall being under 0.5 feet in height. Further clarification on the detail and grading must be made. 7. It appears that no provisions are being made to capture storm water runoff from the plaza area. According to the plans, storm water runoff will flow away from the building to the seat wall, then along the seat wall to the southeast, finally spilling off the edge of the retaining wall and on to the public sidewalk. The storm water runoff must be captured on site and must not be allowed to spill uncontrolled onto the public sidewalk. 8. The proposed retaining wall exceeds 4 feet in height and will need to be designed by a registered structural engineer. 9. The southeast corner of the large central island (containing the pervious pavers and Netlawn) has a rather flat spot in the gutter line from the indicated spot elevations of 906.09 to 906.01. It appears this slope is less than 0.5% and could be increased without detriment to other parts of the parking lot grading, thus creating a more positive drainage flow around the gutter line to the pervious pavement area. 10. All gutter slopes shall be at least 0.5 %. 11. A high point should be created in the east entrance, at the parking lot, to prevent parking lot storm water runoff from flowing down to Town Center Parkway. 12. The parking island north of the main entrance to the building will trap water in the western corner. The island should be regraded to alleviate this problem. Utility Plan (Sheet C4.0) 1. The pervious pavement system is shown as being partially constructed with this phase. It is unclear how, in a future phase, the rest of the pervious pavement system can be connected into the existing system from a constructability standpoint. It appears that the entire pervious pavement system must be constructed with this phase unless an alternative construction method can be demonstrated and submitted for City approval. 2. Silt fence or other approved means must be utilized to prevent siltation of the pervious pavement system by runoff from the unpaved areas to the north. 3. All catch basin leads must be at least 15 -inch diameter. 4. The slope of the storm sewer outlet pipe to Town Center Parkway is shown connecting to the existing stub at 1.79 %. The existing stub is shown on the Legacy at Woods Edge — Phase 1 plans as being at 1.00 %. The applicant shall coordinate with SEH in revising both the stub and proposed private storm sewer to match grades. 5. The detail for the sanitary sewer manhole should include Infi- Shield neoprene boot (or equal) around casting and rings. Also include a note allowing a minimum of 2, maximum of 5 adjusting rings. 6. Sanitary manhole #2 will require an outside drop as it exceeds the City maximum of 1' difference between inlet and outlet elevations.