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Council hears $26,600 tunnel erosion study and up to $825,000 placeholder for trail repairs
Summary
Staff asked council to approve a $26,600 task order for an erosion-control study at the 2499 tunnel and presented a worst-case construction placeholder of $825,000 (retaining-wall scenario); council discussed riprap and terracing as lower-cost alternatives and emphasized preserving trail safety.
Staff described ongoing erosion near the 2499 tunnel and proposed a $26,600 task order for an erosion-control study to generate engineered options. "That study will provide landscape and drainage options and include riprap, terracing and retaining-wall alternatives," the parks/staff presenter (Staff member, S10) said.
Staff added a construction placeholder of $825,000 to cover a worst-case retaining-wall solution if needed, and said riprap or terracing could be substantially less expensive. Council members urged thorough vetting and noted long-term maintenance obligations for any retaining structure. "Retaining walls are expensive but sometimes necessary; riprap has worked well in other locations," a council member (Committee member, S4) said.
Staff emphasized the safety implications of sediment entering the tunnel and the need to balance engineering and landscape solutions. The council took the study task order as the next step and requested the study results before deciding on expensive construction options.
