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,. . , . City of Arden Hills Keithson Drainage Improvement Objections to Proposed Assessment Summary and Response July 27. 1992 Summary of Events Reqardinq the Keithson Pond Project The original plat for this property showed a pond located in the area of what is now Keithson Drive and the Crimmins and Magers\Tredal lots. This pond was to have been reconfigured and relocated to the rear of the four southernmost lots on the western side of the plat. The reconfigured pond was to have been sized to hold the incremental runoff generated by the impervious surfaces constructed in the development. Based upon a topographic map supplied by E.G. Rud, it was anticipated that the pond would drain in an overland channel that was, and still is, located behind the Crimmins property. Presumably, this had been the drainage route for the original pond. A weir with an approximate elevation of 972 feet above MSL was planned to meter the runoff. Runoff from the street was to have been channeled to the new pond through piping. . When the original plat was acted upon by the Council the developer asked if the City's engineer could be used to design the utility work in the plat. Short-Elliot- Hendrickson, the City's engineer, deferred the request and was never under contract to this developer for this project. The developer, as is always the case, had two options regarding the construction of improvements (i.e.. streets and utilities). Either he or the City could build them, and in the latter case, the costs would be 100% assessed. The former approach was chosen, where the builder installs the utilities and upon approval, dedicates them to the City. In either case. the City's engineers would have overseen the project, which is what Short-Elliot-Hendrickson did. . Approximately one year after the original plat was approved, the developer asked that the pond easement area be amended. Rather than having it extend behind the four southwesterly lots, the pond and its associated easement was to be concentrated in an area between what are now the lots of Magers/Tredal and Crimmins. This area, which was originally platted as a lot, was to be split and attached to the adjacent lots. A drainage easement was to cover this entire area and parts of both adjoining lots. As with the earlier plan, the pond was to drain overland to the southwest in the existing channel. Since the elevation of the channel had been found to be higher than what had originally been 'believed, the metering weir was eliminated. Also, since the street runoff no longer had to be carried to the back of the lots, its piping was eliminated. This revision was approved. Page: 1