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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