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Water and Wastewater System Information

Water and Wastewater System Information. PWCSA Water Purchase. Key Points From April 21, 2008 Meeting With PWCSA PWCSA is willing to re-open discussions on the take-over option Agreement for purchase will not have a take-or-pay clause Reduces purchase and operational complexity

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Water and Wastewater System Information

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  1. Water and Wastewater System Information

  2. PWCSA Water Purchase Key Points From April 21, 2008 Meeting With PWCSA • PWCSA is willing to re-open discussions on the take-over option • Agreement for purchase will not have a take-or-pay clause • Reduces purchase and operational complexity • Storage capacity available from PWCSA is only 0.5 MGD • Will not meet DEQ storage requirements for1.83 MGD (in 5 years) • If storage was available as required, it would add an additional $750,000 to $1,000,000 to the purchase agreement

  3. General Water Operation Design Criteria • Provide fire flow and pressure as demanded • Ensure Manassas water and PWCSA water pressures do not conflict on the east side • Provide required storage for capacity, now and future • Replace wells on the west side • Ensure required “turn-over” of the Joshua Court tank (if the City keeps the tank as staff recommend)

  4. How the City’s Water System Works Now East and west side systems are separated • West side • Served by wells • Emergency backup from Rugby Vault • Water storage in Mathis and Blooms Quarry Tanks • East Side • Served with City of Manassas water • Emergency backup from Conner and Roseberry Vaults • Water Storage in Joshua Court Tank

  5. Near Term Operation • Ensure adequate fire flow to Cougar Elementary and Downtown Center immediately • Pressure sensors at Roseberry Vault and Conner Vault for Cougar Elementary and Birmingham Green are in place • Pressure drop occurs when there’s a sudden and/or sustained demand for high flow in the system (fire fighters drawing from hydrants) • Pressure sensor senses drop in pressure on City’s side of the Roseberry and/or Conner vault(s) and sends a signal to the Blooms Quarry Fire Booster Station and the pumps kick on • Test of the system being scheduled.

  6. Interim Operation With PWCSA Water By September 2008 (when agreement is executed) • Take 1.33 MGD of PWCSA Water at the Rugby Vault on the west side of the City • Provides PWCSA service to the West side (0.5 – 0.8 MGD) and wells are shut down • Fill Mathis and Blooms Quarry tanks with PWCSA water entering from the Rugby vault • Create two pressure zones on the east side until final infrastructure is put in place • Eliminates pressure conflict between Manassas water and PWCSA water. • Isolation with existing valves.

  7. Interim Operation With PWCSA Water (Con’t) • Pump water from the Blooms Quarry tank to the Joshua Court tank using the City’s existing booster station on Blooms Quarry tank site • Set Joshua Court tank at level to provide 457 pressure to Cougar Elementary, Downtown Center, and areas adjacent • This configuration is temporary until final infrastructure is in place.

  8. Future Operation With PWCSA Water January 2009 Separate east and west side systems again • West side • Construct “Mathis Vault” to serve west side from Manassas • Water storage in Mathis and Blooms Quarry Tanks • Emergency backup from Rugby Vault • East Side • Served by PWCSA at Conner Vault and Joshua Court Tank • Emergency backup from the Euclid and Roseberry Vaults • Construct booster station at Joshua Court Tank for maximum effective storage • Water storage in the Blooms Quarry and Joshua Court tanks.

  9. Staff Recommendations • Staff recommends that the City keep the Joshua Court tank • Provides control of the City’s water storage needs • Provides much more operational flexibility for regulating flow and pressure on the east side  • Propose to add infrastructure (engineering estimate being prepared) • Construction of “Mathis Vault” • Construction of booster pump station at Joshua Court Tank • Funding is available in the approved FY08 Enterprise Fund budget

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