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Planning Commission Regular Meeting Minutes October 18, 1994 Page 8 1 Finn stressed that the parking area by Knox that does not have a pond is a significant risk area. If 2 toxins were spilled in that area, he felt they would run straight into Silver Lake. He requested to 3 see the capacity requirement data for the Plaza. 4 Morrison stated that all of the data submitted by Barr Engineering on this subject was available 5 for review at City Hall. 6 Faust noted that the biggest potential for contamination seemed to be in the enclosed area of 7 Knox rather than the parking area and asked if that part of Knox was drained to a pond. 8 Beduhn confirmed that the area does drain to a pond. 9 10 Douglas Jones, 2505 Silver Lane, asked what requirements were used to calculate the amount of 11 drainage required for the Apache Plaza. 12 Eric Thompson,Rice Creek Watershed District, explained that the area needed in the ponds was 13 determined by volume of run-off. There needs to be enough area for 3.4 inches of water to stand 14 in a storm. This designates the width and depth required so that water will still flow through the 15 pond. There needs to be enough area for the water to slow down below the critical velocity of 16 85%to allow the sediment to settle out of the storm water. He explained that this is a 17 redevelopment project rather than a new development project, so much of the land-use has not 18 changed. There were existing paved surface and roof surface which is being replaced with 19 reconfigured paved surface and roof surface. The pond areas will be treated according to the 20 Rice Creek Watershed District standards. He reported that the drainage plans proposed by Barr 21 Engineering will be brought before the Rice Creek Watershed District Board next week and will 22 be recommended for approval. 23 Jones asked if there was a plan for landscaping on the green strip along the lower end of the 24 parking lot. He cited the new Eden Prairie Menards which has planted mature trees as buffer 25 screens. 26 Hehr stated that the green strip had not yet been formulated but that there was a possibility of 27 that. In response to Gondorchin, Ijehr replied that he was not aware if there was a contingency 28 plan in place to handle the possibility of volatile chemicals being spilled in the parking area,but 29 that he would find out. 30 Jones inquired if there was a snow storage plan in place. He expressed concern in regards to all 31 of the snow being stored in an area where there was no drainage. He also inquired as to the 32 possibility of more drainage being added further down the system. 33 Cavanaugh stated that this was not economically feasible. , •