5 PCSR 01-25-1994 - Laserfiche WebLink

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• Mr. Steve Ach January 12, 1994 Page Two • There is a 900 contour at the southeast corner which wraps around, creating a pocket which will not drain. This contour should be reconfigured to meet the existing 900 contour in Lion's Park to eliminate any standing water. • Grading along the south side of the property abruptly terminates at the Burlington Northern Railroad property. It is unlikely that this will be possible to achieve in the field. The developers should apply for a permit to do minimal grading in the Burlington Northern Railroad right-of-way and properly complete the grading in this location. • Immediately to the west of the parking at the north end of the building, the contours do not appear to provide adequate grade for drainage around this side of the building. From the catch basin located north of the building to the southwest corner of the parking area is approximately one foot of fall. However, half of this is taken up by the concrete curb. This provides for very minimal grade around that side of the building. It is unlikely that the drainage in this area will find its way around to the • north side of the building, but rather will be directed into the side of the building. • Prior to any work being done on the side, an erosion control plan should be approved and put into place. The site is approximately four acres and it appears that it will be totally graded. There will be need for silt fence or some other type of erosion control around the perimeter of most of the site. C. UTILITY PLAN • A review of the storm drainage in the area indicates that by adding this size of property with this much impervious surface directly into the 36-inch pipe which crosses it may cause additional ponding on Proctor Avenue. The catch basins at the low point on Proctor are approximately two to three feet lower than the catch basins on the apartment site. This could cause additional length of ponding at each of the catch basins along Proctor until additional capacity is available after the apartment site drains. To eliminate any concern regarding this type of problem or the concern that the Proctor Avenue flowage would pond water on the apartment site, we would recommend that the storm sewer from the apartment site be directed independently into the Lion's Park pond. The best scenario for this could be reviewed with Phil Hals, but it is believed to be parallel to the existing storm sewer along the north side of the apartment site. 411 206-1202.jan