12-09-1985 Council Packet - Laserfiche WebLink

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To: Planning Commission Members From: Michael P. Gaffron, Assistant Zoning Administrctor Ddte: November 1.4, 1985 Subject: #929 Lyle Rahn, 1146 Wii,1hurst Trail - Conditional Use Permit - Third Review This application was tabled at your October 21st meeting pending a review of the hardcover and drainage situation. You will recall that the genera). attitude of the Planning Commission was to grant the conditional use permit for g,.est cabin usage subject to the hardcover being made as conforming as is feasible, and subject to applicant addressing the drainage problems. List of Exhibits Exhibit A - Survey With Hardcover Exhibit B - Hardcover Calculations Exhibit C - Conceptual Drainage Control System (By Applicant) Exhibit D - Planning Commission Minutes of 1.0/21/85 Exhibit E - Notice of 10/22/85 Exhibit F - Staff Memo of 10/17/85 With Notes Exhibits A and B show that existing hardcover in the 0-75' set- back zone is less than 2%. In the 75-250' setback zone, existing hardcover is about 35.5%. This could realistically be reduced only a few percentage points. The stairways and walkways on the property are for the most part. necessary for the usability of the property due to the steep slopes. The upper driveway is about as small as possible while still being functiona.i. The lower driveway is graveled about halfway across the lot, and also serves as access for the City to maintain its sewer line which crosses the property. The property has an obvious drainage problem as you can see along the south side of the house, where erosion is occurring. Suggest applicant proposes a swai.1/gutter and cistern or "dry well" system which would transport the run-off from the hills above the house to temporary storage for underground discharge. This would create the nc.'ed for additional hardcover (note the 5' wide blacktop strip in Item C-5) but if functional would ultimately tend to reduce the amount of sediment entering the lake from *he surface run-off. I would suggst that the applicant obtain the ad rice of a qualified engineer before actua.1ly constructing such a system. City Engineer., Gienn Cnok's initial thoughts on this are that a catch basin and underground pipe would be better than the swale. The only item of hardcover that could realistically be reduced is to remove the plastic from benecth the wide stairway between the house and the lower driveway. This might drop it to about 34.5%. The added swail. (about 5'x100') would bring this back up to about 39%.