Agenda Packet Cc - regular meeting 10/23/1989

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Zoning File #1411 September 1, 1989 Page 3 of 9 Area 2 to our northwest requires the installation of a retention pond in the csrner. Storm sewers take run-off from the roadway along the shared lot lines of Lots 1 and 2, Block 1 to the retention area. Area 3 in the mid -north portion of the property drains as staff originally thought predominately to the south and eventually to the large retention area on the east border. Major drainage easements will be retained by the City between the shared lot lines of Lots 4 and 5, Block 1. Note that applicant has also shown the required 26 foot setback from the edges of the wetlands defined at the 975 elevation. At the street intersections drainage is taken via a storm sewer with an outlet to the retention pond to the east. Drainage from Area 3 eventually dr.nins into the watershed along Old Crystal Bay Road and eventaully to French Lake over grassed swaled yards and »nderground drainage dipes. Area 4 drains to a retention area to the immediate north of the "exception" in the plat via an underground tile to Area 5, which eventua, ' y (!gains to Farview plat and eventually to Maxwell Bay. All retention ponds have baffels with controls on outlets review Exhibit X for details. Each retention pond has been defined at the flood elevation, rather than the normal high water mark. The applicant's engineer has also provided information on minimum basement elevations for Lots affected by the retention areas. The City will acquire conservation and flowage easements over all retention areas defined as drainage easements and in addition the City will ask for drainage easements over the drainage ways and storm sewers (located out of road right-of-ways) protecting integrity of the drainage system within the development. Grading/Erosion Control/Landscaping Typical sections of the road and the silt fence detail are provided in Exhibit X. Lots 2 and 3, Block 1 will be filled to raise the building sites. All other lots will remain undisturbed. The only alterations proposed on this property will be the installation of the roads and the filling of Lots 2 and 3. It should also be noted that the septic areas within those two lots should be staked before heavy equipment is allowed to enter site. The City Engineer has reviewed the grading plans and has conceptually approved them. I have also been advised by Mr. Gronberg that he will be able to demonstrate the minimal removal of trees as a result of these excavations. In addition he will provide a landscape plan that provides plantings along the roadway of Fox Street and Leaf Street. In relation to other properties that have been subdivided in the City, this property has minimal tree coverage. Planning Commission members may wish additional plantings within interior of property. If Planning Commissicn concurs, staff will work with the applicant to provide additional plantirgs along the interior plat road.