3 PCSR 10-19-1993 - Laserfiche WebLink

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Steve Ach • October 15, 1993 Page Five 5. All the sedimentation ponds on the site are designed for 100-year rainfall event. However, the storm drainage collection system is designed for a 10- year event. This raises the question of whether or not the storm runoff in a 100-year rainfall event will actually get to the ponds and, if so, how long and how much isolated flooding can be expected at the collection points. There are two major collection points proposed in the parking lot in front of the Wal- Mart Store. The elevation of these collection points is approximately 927. The first floor of the Wal-Mart store is only 3 feet above this at 930. The method of overland flow to the ponds needs to be carefully reviewed during the design phase to ensure no negative effects. It is not shown in the drainage calculations how deep or how long flooding can be expected at these locations. Additional information should be provided to show that there will be no negative impact by the size of the storm sewer collection system. 6. The Comprehensive Storm Drainage Plan shows additional tributary area for this district lying north of 193rd Avenue on the west side of TH 169. Provisions should be made as part of this development to convey that runoff to the regional pond on the east side of TH 169. • 7. Consideration needs to be given to potential storm drainage runoff from Jackson Avenue into this system. This is a likely scenario, especially when Jackson Avenue is upgraded. D. TRAFFIC ISSUES 1. The revised traffic projections based on the new site plan show a reduction in the PM peak trip generation of approximately 12%. This reduction in total traffic generated by the development does not change or eliminate any of the recommendations for improvements necessary to the external facilities to accommodate traffic generated by this development as outlined in the Traffic Impact Study which was previously completed. Consideration needs to be given to each of these improvements and the timing established to coordinate with the development of this project. 2. Parking stalls are shown to be 19 feet deep by 9.5 feet wide with 24-foot wide isles. This is adequate spacing for parking. 3. Freeport Avenue should be a 52-foot wide roadway as it comes through the development and the access road providing right-in and right-out turns at TH • 169 should be wide enough to facilitate three lanes of traffic, one out-bound and two in-bound. 152-1501.0cr