Agenda - Council - 10/22/2002 - Laserfiche WebLink

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Preliminary Plat White Oak Addition August 29, 2002 Revised: September ] 7, 2002 Revised: October 4, 2002 Revised October 22, 2002 Page 2 of 3 Access and Streets: Lots 2, 3, 4, and 5 will gain access from the extension of 158t~ Lane into the property, ending in a cul-de-sac. The proposed cul-de-sac does not exceed the maXimum length of 600 ft. Lot 1 is proposed to gain access from CR56. The wetland located on Lots 2, 3, 4, and 5 prohibits Lot 1 from gaining access to the new road. Lot 5 currently has access to CR56; the developers are proposing to change this access to 158t~ Lane. The plat has been reviewed by Anoka County Highway Department and their October 9, 2002 letter is attached. Anoka County is recommending that all fight-of-access along CR56 on Lots 2 and 5 be dedicated to the County. The County is questioning the location of the proposed drive entrance for Lot 1, Staff has observed a 7-second reaction time for northbound traffic at the proposed drive location. A~ minimum of 10 seconds is desirable. Once the best location of that driveway is determined, the remainder of the frontage along Lot 1 will also need to be'dedicated to the County. Anoka County is also requesting a right mm lane for southbound CR56 at 158th Lane. It should be noted that the building site for Lot 1 is proposed in a location surrounded by wetland and it will therefore be necessary to fill the wetland to gain access to this lot. The Department of Natural Resources has determined that the wetland to be impacted by the driveway is not a portion of protected wetland 341W, but is under the jurisdiction of the Lower Rum River WMO. An exemption for the wetland filling will need to be obtained from the LRRWMO to facilitate this filling. Lot Size and Dimensions: The current minimum lot size in the. R-1 Rural Developing Area is 2.5 acres; the five new lots are proposed to be larger than 2.5 acres. The total area of the parcel is approximately 28.5 acres. Grading and Drainage: The extension of 158th Lane will drain overland to the cul-de-sac where two catch basins will transmit stormwater to a detention pond located on the western edge of Lot 5. The overflow from this catch basin will be discharged into-the wetland to the south. The soils outside the wetland area consist of Nymore and Anoka soil types with one Class I soil when .their slopes are less than 12 percent. Sufficient class I soils are present on Lots 1, 4, and 5 to presume that two suitable soil absorption sites are available. For Lots 2 and 3, which contain a large area of steep slopes, the question of whether sufficient area is available for an original septic field and its replacement was addressed in a soil investigation prepared by Mr. Kevin Kloeppner, a certified septic system designer with EcoSystems Engineering. A reported prepared by Mr. Kloeppner and a subsequent letter dated October 4, 2002 confn-m the suitability of these two lots to accommodate a septic field and its replacement. This plat has been issued a permit from the Lower Rum River WMO which addresses permissible low floor building elevations. The latest revision of the grading plan dated 10/11/02 shows the lowest building elevation (Lot 1) to be one foot above the overflow elevation of CR56 in compliance with LRRWMO permit conditions. -255-