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LRRWMO Meeting Minutes January 20, 1994 Page 7 Jankowski stated he feels the superior approach is to require the sedimentation basin. He stated the azea to the southwest will be handled naturally, but the other side has the potential to drain material into the River. He noted that creating a Swale to retain enough volume before it goes into the River would meet that requirement. Brandenburg explained how this can be accomplished by utilizing the bituminous trail level. Jankowski pointed out that design of outfalls will be needed to determine if this method will effectively skim. Haas agreed and suggested Brandenburg provide calculations of what azea is available and how much runoff will be generated. Ferguson commented on the need to provide enough distance and ponding azea from the pazking lot to the River to meet design standazds, keep pollution out of the River and maintain aesthetics. Brandenburg explained that by raising the path it would create a second barrier which exceeds the criteria. Haas suggested the Engineer consider this information and determine if it fits the criteria Jankowski noted that installing an adverse grade culvert may also work. Brandenburg reviewed the anticipated timeframe and that bids will be opened on February 24th. Schultz asked if Brandenburg could submit ponding calculations for consideration at the LRRWMO's February 17th meeting. Brandenburg stated he will have Hakanson- Anderson prepaze the calculations. He added they will comply with whatever the Engineer and LRRWMO direct. Brandenburg explained that the pathways will be constructed with four inches of gravel and two inches of blacktop. Ferguson reported that St. Louis Park constructed pathways in a large heavily wooded azea that was basically peat by using wood chips and limestone. Brandenburg agreed that crushed limestone is an excellent base material but in this case they have base material on site which will be utilized. Consensus was reached that ponding requirements might be accomplished through the walkway system since they can be constructed to act as the inlubiting factor for surface drainage into the River. It was also agreed that the ponding calculations will be submitted to the Engineer and reviewed at the February 17th meeting. Haas asked that the location of the silt fence be shown on the plan, even if it is already in place. Motion was made by Haas, seconded by Ferguson, to request that calculations be submitted to certify ponding requirements for review by the Engineer and inclusion in plans, to request that the location of the silt fence and grading elevations be included in the plans, to request that an erosion control plan be submitted, and to table further action on Permit No. 93-12, Peninsula Park/1'wo Rivers Historical Park to the February 17, 1994 meeting. Vote: 4 ayes, 0 nays. Motion carried.