6.a) Staff Report-Lilleskogen Parking LotStaff Report
To: Park and Recreation Committee
From: Tim Kieffer, Director of Public Works
Date: May 5, 2014
Re: Lilleskogen Parking Lot
Background: The Lilleskogen Parking Lot was sub-cut and aggregate was donated to
construct the base course. Staff received quotes to install two driveway
aprons and replace the existing apron with bold-face curb. The Park and
Recreation Committee decided to wait until spring of 2014 to see if the
cost would decrease. The parking lot was sloped to drain into a rain
garden in the middle of the lot. The Washington County Water
Conservation District, Carnelian-Marine-St. Croix Watershed District, and
staff worked on the design of the rain garden. Unfortunately, the high
water table and shallow catch basin, made the construction not feasible.
Currently, water is ponding and backing up onto the parking lot. Erosion
from the parking lot has begun to fill in the rain garden.
Proposal: Staff is proposing to install two driveway aprons, replace the existing
apron with boldface curb and install concrete curb around the rain garden
to control erosion. Two catch basin structures will be installed to treat the
effluent from the parking lot. An overflow pipe will be connected to the
nearest catch basin which will allow for any water over 1-inch to drain
away. Vegetation within the garden will help absorb the remaining 1-inch
of water.
Issue: What concrete curb work should be done?
Fiscal Impact: The Park Capital Improvement Fund has $7,984. The cost for each catch
basin is $600 plus delivery and tax. Quotes for the concrete are due
Friday, May 2, 2014 that staff will bring to the meeting.
Options: 1) Recommend to the Council to install two driveway aprons, replace the
existing apron with bold-face, and install curb around the rain garden.
2) Recommend to the Council to install only the two driveway aprons
and replace the existing apron with bold-face curb.
3) Other options
4) Do not make a recommendation.
Recommendation: Option 1
Attachments: Proposed work
Pictures of catch basin