North Truckee Drain Relocation Project

1. North Truckee Drain Relocation Project • Update to Flood Project Working Group • Shawn Gooch, P.E. • City of Sparks • February 27, 2008

2. North Truckee Drain Relocation Project JoAnn Meacham, P.E. Utility Manager City of Sparks City of Sparks/HDR Engineering, Inc. Final Project Update December 18, 2007 Shawn K. Gooch, P.E. Jay Aldean, P.E. Flood Control Manager Project Manager City of Sparks HDR

3. What has happened since our last meeting? • Corps decided to check/review their hydrology for the North Truckee Drain • Changed calculation methods • Found inconsistencies with application of original method • HDR performed hydrologic update • Changed design criteria for the Truckee River Flood Project from the 100-yr to the 117-yr storm • Resulted in a significantly larger conveyance structure (from 2: 10’ x 10’ culverts to 2: 22’ x 10’ culverts)

4. Large Box Culvert Photos

5. Alternative Alignments Considered

6. Alignments as Analyzed

7. Alignments Characteristics • ALIGNMENT 1 – PURPLE (NDOT – VISTA) • Runs east along Brierley Way to Vista • Located in UPRR R/W (north of tracks) east of Vista • 3 Jack & Bore Crossings: Vista, I-80, UPRR • Overall Length: ~6,400 LF • ALIGNMENT 2 – GREEN (UPRR TO LARKIN CIR) • 300 LF J&B under I-80 to the South • People’s Drain flow combined w/ NTD on the south side of UPRR • Stays in back yards of private property • Crosses Greg Street with 40’ deep open cut • Follows Larkin Circle to outfall at the Truckee River • Overall Length: ~ 5,900 feet • ALIGNMENT 3 – BLUE (KLEPPE LN TO LARKIN CIR) • 300 LF J&B under I-80 to the South • People’s Drain flow combined w/ NTD on the south side of UPRR • Alignment follows existing NTD to Kleppe Ln • From Kleppe Ln across parking lot to Greg St • Crosses Greg Street with 40’ deep open cut • Follows Larkin Circle to outfall at the Truckee River • Overall Length: ~ 5,300 feet

8. Alignment 2

9. Project Costs • Costs presented are in million dollars and do not include land costs • Alignment 1 $67 • Land Requirements (PERM) (TEMP) • UPRR 3.4 ac 6.0 ac • NDOT 2.9 ac 4.3 ac • Other Private 0.1 ac 0.9 ac • # Lots Impacted 1 5 • Alignment 2 $45 • Land Requirements • UPRR 0.4 ac 1.1 ac • NDOT 0.4 ac 0.6 ac • Other Private 3.0 ac 7.5 ac • # Lots Impacted15 18 • Alignment 4 $46 • Land Requirements • UPRR 0.4 ac 1.2 ac • NDOT 0.4 ac 0.6 ac • Other Private 2.3 ac 6.2 ac • # Lots Impacted 15 23

10. North Truckee Drain Realignment • Next Steps • Value Engineering Analysis • Environmental Assessment • Utilities • Geotechnical Engineering • Surveying • Right-of-Way • Design Build vs Design Bid Build • 104 Cost Sharing and Authorization

11. Questions

12. Current 100-yr Inundation

13. 2006 Storm Inundation