1. E NGINEERING D IVISION 13 th Street Storm Drain Replacement Project Prebid Meeting for Phases 2 & 3

2. E NGINEERING D IVISION Agenda (1)Bid Requirements (2)Project Overview a)High Level – Aerial, Slides, Photos b)Plans – Walk through sheets (3)Attention Items (4)Questions (5)Wrap up

3. E NGINEERING D IVISION Site Overview & Aerial

4. E NGINEERING D IVISION Phase 1 – Cross D&SNGR (Completed) Constructed during D&SNGR shutdown period in 2014 Shown on the plans, but bidding is for Phases 2 & 3 only Will need to tie into Phase 1 as part of Phases 2 & 3.

5. E NGINEERING D IVISION Phase 2 – Cross CDOT Highway 550 (aka Camino del Rio) New alignment Phased approach for traffic 3 lanes of travel at all times One panel construction limit Sewer line proximity & pipe slope Unknown gas location Backfill - flow-fill Anchor pipe for float New concrete panel must be tied into adjacent panel(s) and curb/gutter New Type R Inlet Tie into Phase 1 New structure/pipe installed to get outside of CDOT right-of-way

6. E NGINEERING D IVISION Phase 3 – City Properties to the Animas River Old pipe alignment New Filter Vault & Diversion Structure Connect to Phase 2 New surface WQ feature(s) Includes a wall, Rain Garden, Sand Filter Landscaping (TBD) Connect to other infrastructure Improve pavement for FS&R

7. E NGINEERING D IVISION Phase 3 – City Properties, Outfall to the Animas River, North Point Mall Parking Lot Outfall to Animas River City Arborist ART access Access to Powerhouse Science Center Cleanup at outfall

8. E NGINEERING D IVISION Phase 3 – City Properties, Outfall to the Animas River, North Point Mall Parking Lot Connect Phase 3 Adding new structures and connecting to existing infrastructure Demo/abandon old storm pipe Final Stabilization, cleanup and wrap up

9. E NGINEERING D IVISION Plans & Attention Items Construction Phases 1, 2 & 3 Limits Phase 2 timing (March 30 th – May 22 nd ) Traffic phasing vs traffic control Stormwater Management Uranium Mill Tailings & Management Sewer line under Camino del Rio Unknown gas line depth/location Water Quality features CDS unit & Diversion structure Rain Garden & Sand Filter High flow bypass Outfall to River & Ordinary High Water Mark

10. E NGINEERING D IVISION Questions? Additional Questions can be sent to Purchasing Department (Karen Herman) karen.herman@durangogov.org 970-375-4994 Question Deadline – February 24 th Response to Questions & Addendum – February 27 th Bid Opening – March 5 th Bid Award – March 12 th Notice to Proceed – March 30 th