3. LHL Exhibit AOption Two: Bound Aggregate Surface
Re -engineered
ACTIONS
•Re-grade the road to the north and landing to north and west to provide 4% in-slope to keep runoff away from Gilbertson Creek and the Saint Croix River
•Add 6” bound aggregate surface
•Consider adding chlorides to further stabilize surface (optional)
•Install 3’-4’ wide rock ditch on the north side of the lower road (starting at Quint) to slow water
•Install two shallow sedimentation ponds (half way down the road and by the landing) to allow for infiltration, evaporation and trap sedimentation before reaching the Saint Croix River
•Establish a road maintenance and storm water management plan
•Restore the Saint Croix River and Gilbertson Creek banks
RESULTS
•Will significantly reduce erosion and improve road performance.
•Maintenance of ditch BMPs will likely be 10+ years schedule for clean out
•Minimal construction that significantly limits environmental impact
•Provides 14 Turnout Areas for passing or Emergency Vehicle Parking: 8 Turnouts on South Side of Road and 6 Turnouts on North Side of Road
•Maintains the rural and historic character of the area
•Maintains protective tree canopy
•Supports the size and type of watercraft appropriate for this section of the river
•Compliant with the Scandia Comprehensive Plan
•Relative Cost = $$
NOTES: * This alternative was not presented to the LHL Advisory Committee
* Items in read note differences between Option One and Option Two
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