01-22-1991 Planning Packet - Laserfiche WebLink

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s2- V ;>■ • . ■ sC.'i !■; Janviary 3, 1991 Fairway Hills Add. Page 2 of 3 Soils on the site are predcxninantly Heyder and Burnsville sandy loairs per the Soil Conservation Service maps. The low areas are shown as peat/ntuck. Proposed Plat- Driveway and Development The preliminary plat shows two buildable lots of 3.2 and 2.0 acres, and an 1.0 acre outlet for driveway and utility access. E^reparing the lots as buildable sites will require the construction of an 800 foot driveway, part of which will be across the existing wetland. The plans show a 14' wide bitiiminous driveway with 3:1 side slopes and a maximum grade of 7%. Preliminary alignment is indicated on the plans, with final location and grade to be determined in the field to allow saving of trees, balance of earthwork, and minor adjustments in drainage. Driveway grade and location is also restricted by the need for culverts to maintain drainage, and the elevation of the sanitary scH^r. Depending on house design, some site grading may be required at the building locations. Sewer and water will be extended from the existing city mains for the nearest house. The remaining house is proposed to have a private well and drainfield, althou^ it may be desirable to also provide sewer and water to this house. Drainage and Watershed Considerations 1. Wetland filling The driveway fill would cover about 7900 SF of the existing wetland. The maxiiman hei^t of fill would be about 6 feet, and it would require 2100 cubic yards of material within the wetland limits to construct the roadway. In addition, it will be necessary to remove some of the peat under the proposed driveway to obtain a sound roadbed. There is a total area of 48,425 SF of wetland on the site. The pre^gsed fill would affect approximately 16% of this area. The area north of the existing wetland is at or near the elevation of the wetland. As a part of the plat, the owner proposes to place this area of about 55,000 SF into a permanent easement for dtainage purroses, which will preserve its ability to filter and retain nsioff. 2. Erosion Control The plans show erosion control itois to be utilized during construction, inclixling silt fetice, ditch bale cdiecks, and turf establishtxait. These will be installed and maintained per the Watershed guidelines. Typical details for silt fence and ditch bale checks are attached. D