Tour of Wastewater Collection System

Don Moore

Town of Yountville

Public Works Department/Utilities Division

Introduction of Wastewater System

• Joint Treatment Facility (JTP)

• Recycled Water System/Discharge to Napa River

• Sewer Collection System

• WW Pump Station

Yountville

Veterans Home

Napa River

Highway 29

Silverado TrailWineries

Rector Watershed Views Looking East

Joint Treatment Plant

Effluent Pond

Primary

SecondaryFinal

Chlorine Contact

Collection System

Wastewater Collection System

• System comprised of 634 residential & 76 Commercial Customers

• Reduce Inflow of Rainwater and Infiltration of Groundwater

• Sewer System Management Plan• Maintain and Improve Pump Station• Replace Sewer Pipes

Elements of Sanitary Sewer Management Plan

• Goals• Organization• Overflow Emergency Response Plan• Fats, Oils, and Grease Control Program• Legal Authority

Elements of Sanitary Sewer Management Plan (cont.)

• Measures and Activities• Design and Performance Provisions• Capacity Management• Monitoring, Measurement and Program

Modifications• SSMP Program Audits

FOG (Fats, Oils and Grease)

Hardened Grease Chunk

“Root Ball”

“Break-in Lateral” vs. Factory Made

Broken Clay Lateral

Cast In Place Point Repair

Before After

Sag in Pipe (Abandoned K-Line)

Smoke Testing

Sewer Line Cleaning

Pipe Replacement

Construction of New Manhole Base

Finished Manhole Base

Epoxy Coating (System Loop)

Sewer Main Replacement Projects to Date

• Jefferson St, from Madison to Humbolt ($230,000 in 2008)

• Yount St, from Finnell to Hopper Creek ($90,000 in 2008)

• Mulberry Extension ($70,000 in 2008)

Sewer Main Replacement Projects to Date (cont.)

• Extension of the B-Line on

Washington Street to Land Lane ($567,000, 2009)

• Re-route of F-Line to remove sag and creek crossing ($70,000 in 2009)

• Abandonment/Consolidation Project on

North Washington ($120,000 in 2010)

Collection System Projects for the Future

• Madison Street sewer main replacement from Washington Street to Yount

• Yount Street sewer replacement from Hopper Creek to Monroe

• “Slip-Line” F-Line from Champagne Drive to Oak Circle

• Rehabilitation/Upgrades @ Peter J. Bardesonno Memorial Pump Station (Study required)

Wastewater Pump StationConverted in 1977

Old Check Valve After Replacement

New BioAmp Process

Introduction of FOG Fighting Bacteria

Tie-In Point for Both Major Sewer Mains

Pump Station “Wet-Well”

Newly Installed Hoist

Spare Pump Ready For Installation

Pump VFD’s (Variable Frequency Drives)and Level/Pump Control System

Flow Meter

In Case of Emergency

Projects Completed• Flygt submersible pumps installed (1996)

• VFD’s Installed (1996)

• New emergency generator installed (2004)

• Spare pump purchased and installed (2005)

• Maintenance activities performed (on-going)

Pump Station Upgrades

• Pump Station originally constructed/re-designed in 1977 as part of Joint Treatment Plant Project

• VFD controllers are in need of replacement

• New level control system is necessary

• Force main, pumps and all piping should be evaluated to see if it should be replaced/upsized