AGENDA DATE: 7/5/2018
TITLE:
Title
Hollymead Dam Spillway Improvements
BODY
SUBJECT/PROPOSAL/REQUEST: Adoption of Resolution supporting the temporary closure of Northbound Lane of Timberwood Parkway (Rt 1521) at Lake Hollymead Dam during construction of Lake Hollymead Dam Spillway Improvements.
ITEM TYPE: Consent Action Item
STAFF CONTACT(S): Walker, Henry, Kamptner, Abplanalp
PRESENTER (S): Blake Abplanalp
LEGAL REVIEW: Yes
REVIEWED BY: Doug Walker
BACKGROUND: The scope of work for Hollymead Dam Spillway Improvement project affected by this request includes:
* improvements to the primary spillway at water's edge of Lake Hollymead Dam
* construction of concrete walls along the crest of the dam to direct a modeled
* overtopping event to the center, lowest portion of roadway
* a new concrete outlet structure
* and concrete mat installation on the downslope face of the dam to armor and protect against failure in event of extreme high water (modeled at 5.6' higher than lowest point in road).
This project was recently advertised. Construction is scheduled to begin in mid to late August, with road closure effective the first week of September. Based on this schedule, the construction of dam spillway improvements could commence in September 2018, with need for one-lane road closure extending through April 2019, but not beyond without Board and VDOT extension of Maintenance of Traffic Plan (MOT Plan) temporary road closure with detour to US Rt. 29.
STRATEGIC PLAN: Infrastructure Investment: Prioritize, plan, and invest in critical infrastructure that respond to past and future and improves the capacity to serve community needs
DISCUSSION: The scope of work requires uninterrupted construction for a period anticipated to last eight (8) months, once contractor mobilizes. The guardrail that extends along the east edge of Timberwood Parkway along the crest of the dam will be removed. An MOT Plan (under development) will likely recommend je...
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