Agenda Package - 09-10-07 (Finance)

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® • Install rock baffle on upstream side to direct low flow into only one barrel. • Re-design outlet dissipater that will minimize rip rap length. Construct new outlet dissipater and remove excess rip rap downstream of culvert. Culvert #3: Remove rip rap from stream bottom on upstream end of culvert. Rip rap may be hand placed on stream banks in impacted area only. Re-design outlet dissipator that will minimize rip rap length. Construct new outlet dissipater and remove excess rip rap downstream of culvert. Culvert #8: • Remove rip rap from stream bottom on upstream end of culvert. Rip rap e h ced on ream arled area only. • e-de : n tl issip thaFew i i e 'p rap length. Construct w o t ator mo ss ri rap downstream of culvert. • est ch e ow strea c issi for (to end of original impact area). The restoration will mimic original longitudinal grade and cross- sectional geometry. Proposed Schedule to Complete Restoration at Permitted Crossings • Complete Detailed Design-6/15/06 Complete Construction - 9/1/06 Action Item #3: Restore Non-Permitted Roadway Stream Crossings The three crossings of jurisdictional waters not permitted under the original nationwide permit are Culvert ID #2, #5, and #6 (per the existing conditions map). During the recent field visits by the USAGE, recommendations were provided to the County for restoration. The following actions are proposed for these three non-permitted crossings: Culvert #2: Culvert #5: Remove rip rap outlet dissipater as constructed. Install rip rap lined `plunge pool' per USACE guidance. Design an arch bridge to replace the existing 48" pipe (please see enclosed schematic sketches of proposed bridge). Design a stream restoration plan for the entire impact reach. The restoration will mimic original longitudinal grade and cross-sectional geometry. The bridge footings must be outside the restored stream bank. Remove 48" pipe and rip rap channel and construct improvements. -3-