6.4. SR 07-05-1994 - Laserfiche WebLink

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e Mr. Steve Ach June 15, 1994 Page Four e e 230/226-1503.jun 6. Even though an overall drainage plan was provided with the concept for the entire Hillside development a few years ago, an updated drainage calculation should be provided with this plan for specifically all areas tributary to the pond in the southeast corner of the development. The calculation should specifically show the amount of water draining to the pond, the sedimentation control based on Best Management Practices, and the high water elevation that can be expected relative to the lowest elevation of the homes to the east. 7. It is anticipated that the drainage calculations will show that the outlet from this pond will need to be constructed with this development. An outlot is shown on the plan; however, it is not shown 11) the easement south of 193rd Street. Also, the easement south of 193rd Street is a private easement from one landowner to another. In order to facilitate the storm drainage outlet, this easement or a new easement over the proposed pipe alignment needs to be dedicated to the City. Finally, the City should also obtain ownership over the large regional ponding area south of 193rd adjacent to the Cherryhill Bluffs Addition. As this Hillside Crossing development proceeds, the City should obtain ownership and be responsible for maintenance of the storm drainage facilities starting at the pond in Hillside Crossing, and proceeding from that point southerly. 8. Storm sewer on Evans Avenue is shown at two locations and from there heads directly into Block 2, tying into storm drainage facilities in the parking lot, which ultimately outlet into the pond. We would recommend that storm sewer in Evans Avenue run along the street alignment and be available for future extensions of the road to the north. This will provide facilities for the City to extend storm drainage along the right-of-way for City purposes, eliminating the reliance on easements adjacent to or across private property for the purposes of storm drainage. 9. The storm drainage internal to Block 2 runs to the north property lot. It appears it is anticipated that these storm drainage facilities will be available for extension to. the north. Typically, these internal storm drainage facilities would be considered private. If the intent is to provide storm sewer capacity for the development of additional property to the north, somehow the Developer's agreement or some separate agreement needs to maintain this ability, so that in the future, development of the property to the north will have access to this storm drainage. In lieu of that, based on our last comment of extending storm drainage facilities along Evans, capacity for future development to the north could be provided along this route.