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Committee agrees to seek borings and geotechnical recommendations for Church Lake Road slope failure
Summary
The CDC authorized staff to move forward with a GeoEngineers scope to drill borings and produce slope-stability and road-repair recommendations for Church Lake Road; staff will provide traffic control and asked that the GeoEngineers agreement be placed on the June 16 consent agenda, with full repair-cost estimates to follow.
Bonney Lake staff presented a GeoEngineers scope and fee on June 2 to investigate cracking and settlement along Church Lake Road. The proposed work would include subsurface borings, laboratory testing as needed, and written recommendations for slope stabilization and road repairs. Staff said in-house crews will provide traffic control, paint locates and assist to reduce consultant costs.
Council members asked why the failure occurred and whether historic construction or groundwater conditions (including soft soils or old alignments) were factors. Staff said borings are the only reliable way to determine the subsurface soils and to develop a cost-effective repair approach; the presentation noted the road sits cut into a hillside with groundwater pathways that could undermine stability. Staff and council agreed the repair costs could be significant and that final repair funding would be returned to the full council once GeoEngineers provides recommendations and cost estimates.
The committee agreed to place the GeoEngineers scope and fee on the June 16 full council consent agenda for approval of the consultant scope; any recommended repair work and associated construction funding will come later after the borings and cost estimates are complete.
