3.0. SR 12-13-1993 - Laserfiche WebLink

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1 1 I I I , I 5. Analyze the alternative drainage plan which calls for significantly more on-site storage and all drainage flowing to the south with no drainage flowing under TH 169 to the east. The most recent proposed storm drainage plan submitted by the Elk Park Center developer on November 22, 1993, includes a single large stormwater pond along the south edge of the development (see Exhibit 9). The proposed pond is approximately 3.3 acres in water area with the normal water level of 904.0 feet, and 4.7 acres in water area with a high water level of 910.0 feet. The pond provides a total storage volume of approximately 24 acre- feet. Exhibit 10 shows a cross sectional view of the proposed pond. I 1 1 . Providing a storm drainage pond along the south end of the development follows the natural topography of the area. Runoff from the existing area currently ponds in this area, as the basin drains in a southerly direction. A soil boring done in 1986 for the water tower adjacent to the Elk Park Center site shows water levels to be at an elevation of 900-905 feet mean seal level (msl). The existing pond between Jackson Road and TH 169 has a water surface elevation of 904 feet msl. From this information, the water level in the proposed storm water pond will normally be at approximately 904 feet msl. Please refer to item 4 above for comments regarding the discharge of this pond into the 21" RCP at Freeport A venue and School Street. We are hopeful that this information helps to clarify some of the critical issues regarding the Elk Park Center proposal. We will be prepared to give a detailed presentation of this information at Monday evening's City Council meeting. In the meantime, if you have any questions regarding the information presented, please call. I 1 I J Sincerel y , MSA, CONSULTING ENGINEERS ~O};f ~,0~//laaw Terry r: Maurer, P. E. ~ Paul E. Boettcher, P.E. TJM:tp i ! je , 152.0901.d~c -13- 230-152-10