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Planning Commission Regular Meeting Minutes September 17, 1996 Page 9 1 water back to the in-place storm sewer that serves the south end of Apache Plaza development in 2 connection to the trunk in Silver Lake Road. He stated he met with Kate Drewey of the Rice 3 Creek Watershed District last week and the criteria they would require would be to install a grit 4 chamber for this drainage. This would be a 6 foot by 6 foot box with internal buffers to screen 5 the sediment and would require periodic cleaning. This is not as effective for nutrient but would 6 be better than the typical manhole. This has been discussed with the project proposers and they 7 are willing to proceed with this option. The other issue is the natural drainage to the northeast 8 corner. A catch basin will be installed and when Lot 4 develops,the drainage will be routed 9 through Lot 4 and connected to the new system south of 39th Avenue. In the interim it will be 10 connected to the catch basin on Silver Lake Road. Rice Creek Watershed District has found this 11 acceptable. 12 Mr. Miller explained that all the drainage on the site will be treated, once the area is fully 13 developed. 80% of the drainage of the water from this site will go through the two pond 14 systems. This has been reviewed with OPUS and they are in agreement and will permit this. 15 Momson asked if the grit chamber would be permanent. Mr. Miller stated he believed it would 16 be but there was a possibility that when the body of the Center is removed, depending on the 17 development scheme of Lot 7, the drainage may be routed to a future pond in that area. Mr. Jones confirmed that 80% of the site includingboth roofs all of the parcel that is on the east 19 side of the property and all the property on the north side, will eventually drain into the two 20 ponds which have been constructed on the south side of 39th. 21 Mr. Miller stated this was correct. 22 Mr. Jones stated this he felt this showed good faith. He asked if it would be possible to drain the 23 water from the grid chamber back behind Taco Bell into the Soo Line Railroad right-of-way. 24 Mr. Miller stated he was aware that there was drainage to that area but it is unpermitted. 25 Mr. Jones stated he felt Westwood Professional Services had answered all questions completely 26 and honestly, and was doing a marvelous job on the development to date. He stated he was 27 pleased to see the development go forward and was only concerned with the potential damage to 28 Silver Lake. He stated he was willing to accept Westwood's word as long as it was part of the 29 public hearing. He stated he would like a stipulation included in the granting of the variance that 30 all the drainage of this site would be handled as stated tonight. 31 Chair Bergstrom stated he was happy to hear that the relationship was going well.. He noted the 32 Planning Commission does not have to authority to approve ponding and NURP standards. They have been deferring this to Rice Creek Watershed District and will continue to do so.