02/07/2011 Council Packet - Laserfiche WebLink

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structure and improved it to be accessible. The structure was found to be installed to get over a large gas line and can't be easily lowered. This structure keeps the upstream ponds at their normal design elevations. The basin on the north side of the airpark doesn't infiltrate as fast as it should and therefore doesn't dry out before the next rain event. The water in the basin fluctuates several inches. The elevation doesn't get any higher than the designed 100 -year elevation of 897.0. RCWD drainage alternative report has defined two possible options to address the resident concerns. Option 1 to directional bore under Palomino Lane would cost $90,390. Option 2 to add 1800 feet of storm pipe east to the RCWD ditch would cost $64,050. RCWD had an additional report performed regarding a no- action option which stated no measureable change in the water quality would result in the improvements (January 26, 2011 memo attached). City staff has worked on this for several years and agreed with the past projects. We feel that the infiltration basin on the north side of the airpark, while not functioning to the desired ability, doesn't provide an adverse effect in the current condition. This was a wetland area prior to the development and there are ponds with standing water to both sides of this infiltration basin. We don't feel that the proposed improvements are justified. Requested Council Direction City Council is asked to give staff direction if any further efforts should be taken to provide resources or funding of any future improvements.