Tour of Water and Wastewater Systems

Graham Wadsworth

Town of Yountville

Public Works Department

Introduction

• Water System

• Wastewater System

• Expenses

• Revenue

Water System

• Source

• Treatment

• Transmission

• Distribution

Yountville

Veterans Home

Napa River

Highway 29

Silverado TrailWineries

Rector Watershed

Rector Watershed

Yountville

Lake Berryessa

Joint Treatment Plant

Recycled Water Users

Napa River

Napa River

Highway 29

Water Sources

• Rector Reservoir

• Lake Hennessey / Conn Dam

• Emergency Well

Rector Reservoir

Dam

Silverado T

rail

Rector Water Treatment Plant

Rector Dam and Treatment Plant

Water Distribution System

• Fire Hydrant Flushing Program

• Cross Connection Prevention Program

• Water Meter Reading

Water Distribution System

• Sampling, Testing and Reporting

• Water Conservation and Rebates

• Replace Water Lines and Meters

Water Pipelines

Fire Hydrant Flushing

Back Flow Prevention Device

Wastewater System

• Collection

• Treatment

• Disposal

• Recycled Water System

Wastewater Collection System

• Reduce Inflow of Rainwater and Infiltration of Groundwater

• Sewer System Management Plan

• Maintain and Improve Pump Station

• Replace Sewer Pipes

Smoke Testing

Sewer Manhole Coating

Sewer Line Cleaning

Wastewater Pump Station

Pipe Replacement

Levels of Treatment

• Primary

• Secondary

• Tertiary

Joint Treatment Plant

Joint Treatment Plant

Effluent Pond

Primary

SecondaryFinal

Chlorine Contact

Control Panel

Primary Sedimentation Tank

Sludge Digester

Primary Trickling Filter

Secondary Sedimentation Tank

Secondary Trickling Filter

Solids Contact Chamber

Final Sedimentation Tank

Fuzzy Filter

Chlorine Contact Chamber

Effluent Pond

Effluent Discharge

• Napa River during Wet Season

• Recycled Water Users during Dry Season

• Recycled 43% of Effluent in 2004

• Recycled 83% of Effluent in 2009

Yountville

Veterans Home

Napa River

Highway 29

Silverado TrailWineries

Rector Watershed Views Looking East

Vintner’s Golf Course

Joint TreatmentPlant

Effluent Pond

Sludge Drying Ponds

Highw

ay 29

Mondavi Recycled Water Pond

Operating Expenses

• Purchase of Water

• Salaries and Benefits

• Electricity and Gas

• Contract Services

• Chemicals

• Equipment Maintenance

Capital Improvement Expenses

• Recycled Water Project

• Improvements to Joint Treatment Plant

• Replace Water and Wastewater Pipes

• Replace Water Meters and Blow Offs

Revenues

• Water Enterprise Fund

• Wastewater Enterprise Fund

• Veterans Home for Joint Treatment Plant

• Recycled Water Sales

• Developer Impact Fees for Capital Improvements

Conclusion

• Provide Safe, Clean and Reliable Water

• Minimize Pollution to the Napa River

• Minimize Expenses

Questions and Answers