Pacheco Reservoir Expansion Project

Unique Opportunity for Ecosystem Enhancement, Flood Risk Reduction, Improved Water Supply Reliability and Emergency Water Supply

Santa Clara Valley Habitat Agency Public Advisory Committee Meeting May 2, 2019

1 Of 9 Project Partners

Pacheco Pacheco Creek Pass Water District

2

2 Project Location

Pacheco Expansion

Existing

3 Existing Pacheco Reservoir Facilities

• Existing /Reservoir 6,000 acre-foot reservoir 100-foot-tall earth embankment dam Concrete spillway

4 Existing Pacheco Dam/Reservoir

5 Existing Concrete Spillway

6 Proposed Pacheco Reservoir Facilities

• Expanded Dam/Reservoir Up to 140,000 acre-foot reservoir New 319-foot earth embankment dam New concrete spillway • Conveyance between Pacheco Conduit and expanded reservoir 1-Mile tunnel/pipeline Pump station Selective level inlet/outlet structure within reservoir

7 Rendering of Expanded Reservoir

8 Proposed Earth Embankment Dam

9 Project Benefits

Enhance habitat for Enhance water Increase water Resolve the water Reduce flooding federally threatened supply in below- supply reliability quality problem in along Pacheco steelhead normal years to and emergency supply sourced from Creek and to wildlife refuges in water supply San Luis Reservoir disadvantaged the Delta communities

10 25 Enables Federally Threatened Steelhead 20 Recovery

15 The Project will improve conditions in watershed critical to recovery 10 • Improves water flow in Pacheco Creek in all hydrologic conditions 5 • Larger cold water pool improves

0 temperature in Pacheco Creek Wet Above Below Dry Critical Normal Normal • Increases SCCC Steelhead cohort Without Project With Project score • Enables growth of an independent population in the Pajaro watershed

11 Enhances Bay-Delta Ecosystem

Increases water supplies to Delta watershed refuges • Dedicates irrigation to wetlands in below-normal water years • Increases food supply for migrating Pacific Flyway waterfowl in the fall and winter

12 Enhances Water Supply for Agriculture and M&I

The Project will reduce drought risk to agricultural and M&I water users • Increases the water supply in dry years • Improves groundwater conditions to agricultural customers • Materially contributes to sustainable groundwater management goals in four basins

13 Delta levee Provides Emergency Water failure, Supply Jones Tract The Project will provide dedicated emergency water supply • Increases emergency water supply • Increases local surface storage capacity by 90% • Mitigates risk of Delta export outages and imported water conveyance outages

14 Eliminates San Luis Low Point Water Quality Issues

Algae Bloom The Project reduces operational in San Luis constraints at San Luis Reservoir and Reservoir prevents impaired water quality deliveries by • Delivering CVP supplies to the Pacheco Reservoir earlier in the season • Providing Pacheco Watershed supplies captured in expanded reservoir • Using the Pacheco Reservoir as a blending source when needed • Reducing spikes in taste and odor 15 Reduces Flooding in Disadvantaged Communities

The Project will protect disadvantaged and vulnerable communities against flooding • Decreases flood flows by up to 61% downstream of dam by reducing Pacheco reservoir releases • Reduces 100-year flood flows by up to 4,700 cfs • Prevents floods equivalent to January 11 and February 10, 2017 Pacheco Creek floods

Pictured above: Hollister 2014 flooding

16 Project Schedule

August 2017 Nov 2018 April 2024 Finalize Plans WSIP Commenced and application Planning and Specifications submitted to July 2018 Design commission Commission conditional Jan 2022 Nov 2024 approval of $484.55 M / Draft EIR for Award public review Construction $24.2 M early Contract funding

May 2019 17