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Wastewater Collection Options for Lakota Beach Area Sub-Basin. Special Meeting June 27, 2001 John Bowman Lakehaven Utility District (253) 946-5401. Goal of Meeting. Provide information on Wastewater Collection Options Provide cost estimates

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Wastewater Collection Options for Lakota Beach Area Sub-Basin


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    Presentation Transcript
    1. Wastewater Collection Options forLakota Beach Area Sub-Basin Special Meeting June 27, 2001 John Bowman Lakehaven Utility District (253) 946-5401

    2. Goal of Meeting • Provide information on Wastewater Collection Options • Provide cost estimates • Provide information on how a project can start and what it means to the property owners • Answer Questions

    3. Area of Interest DRAFT Lakota Beach Area Total Area: ~105 Acres Property Area: ~80 Acres Tax Lots: ~135

    4. Wastewater Collection Options Gravity Sewer System Pressure Sewer System Others (not considered viable) Vacuum Sewer System STEP, Septic Tank Effluent Pumps Small Diameter Gravity Cost Components: Infrastructure (Utility Owned, Public Facility) Private Facilities (Homeowner Owned) Fees and Charges

    5. Gravity Sewer System Facilities • Typical for most areas • 4” Gravity Side Sewer pipe from Building to 6” Sewer Stub near property line (Private Facility) • 6” Sewer Stub pipe from property to Gravity Main in street (Public Facility) • Gravity Main flows to the treatment plant or a Central Pump Station that moves flows over hills through pressurized-mains toward the Treatment Plant • For Lakota Beach Area, Central Pump Station is needed

    6. DRAFT Lakota Beach Area GRAVITY SEWER SYSTEM Pump Station Gravity Main Force Main

    7. Pressure Sewer System • Alternative Sewer System (Low Pressure <50 psi) • Short 4” Gravity flow from Building to Small Grinder Pump, usually near building (Private Facility) • Pressurized slurry from Pump moves through a small 1-1/4” Side Sewer (Private Facility) to an equally sized Pressure Sewer Stub near the property line (Public Facility) • Pressurized flow continues into pressure main ( Public Facility, usually 2” to 4” in diameter) in the Right-of-Way to a Gravity System or Treatment Plant • For Lakota Beach Area, some to Treatment Plant, some to nearby gravity

    8. DRAFT Lakota Beach Area PRESSURE SEWER SYSTEM Pressure Main

    9. Has an Option been chosen for this Area? • NO • Typically new developments are required to provide gravity type service where available • Alternatives are considered based on cost on environmental issues • A selection will have to be made once a project is proposed

    10. Gravity Sewer System with Pump Station(for LBA) • Pros • Most home would not have mechanical components for the home owners to maintain (some still need to pump) • If zoning densities increased, gravity systems typically have more inherent capacity for additional flow • Only Central Pump Station affected by power outages (on-site generator is assumed)

    11. Gravity Sewer System with Pump Station(for LBA) • Cons • Generally higher cost to install in developed areas • Gravity Mains would be installed near center of road (probably need to rebuild roads) • Gravity Mains would be installed from 6 feet to 18 feet in depth, Pump Station about 20-25 feet deep • More disruptive to traffic and access • 8” Minimum Size (DOE Standard) • About 25 homes will still need to pump to gravity main • Pump Station must account for Inflow and Infiltration potential

    12. Pressure Sewer System(for LBA) • Pros • Less expensive to construct • Pressure Mains could be installed on the side of roads (avoiding significant road work) • Pressure Mains smaller (2”- 4”), installed at about 4 feet in depth • No Central Pump Station • Less disruptive to traffic and access • Lower potential for Inflow and Infiltration

    13. Pressure Sewer System (for LBA) • Cons • All homes would have individual pumps to maintain • If zoning densities increased, pressure systems typically have less inherent capacity for additional flow • Individual home owners affected by power outages • Size of the mains is more critical. Need to maintain a 2 f/s velocity to keep solids from settling out

    14. Infrastructure Costs • Gravity Sewer System • Estimated Cost: $1,860,000 • Pump Station w/Force Main • Gravity Mains and Stubs to properties • Road Restoration • Pressure Sewer System • Estimated Cost: $ 568,000 • Pressure main and stubs w/restoration

    15. Private Facility Costs • Gravity Sewer System • Estimated Cost: $2900 (Range $2000-10,000) • Assumes 120’ of 4” pipe @ 20$/ft • Septic Tank Abandonment @ $500 • Pressure Sewer System • Estimated Cost: $5900 (Range $4000-8000) • Assumes 120’ of 1-1/4” pipe @ 10$/ft • Grinder Pump installed @ $4200 • Septic Tank Abandonment @ $500

    16. Connection Fees • Gravity Sewer System • Estimated Cost: $2865 • Capital Facility Charge $2720 • Side Sewer Permit $145 • Pressure Sewer System • Estimated Cost: $3040 • Capital Facility Charge $2720 • Side Sewer Permit $145 • Private Pump Agreement $195

    17. How are these costs paid? • Infrastructure Costs is typically distributed equitably to property owners by either: • Front footage • Per Lot • Per Area • or Zone and Terminus • Private Facilities Costs belong to individual properties • Connection Fees are uniform, unless there are more than one residential unit per property

    18. Example of Total Costs: Based on Area Charge: Total Infrastructure Cost / 80 Acres and assuming a 1/2 Acre Lot

    19. Example of Total Costs: Based on Per Lot Charge: Total Infrastructure Cost / 135 Lots

    20. How is a Project Started? • Utility Local Improvement District (ULID) • Petition • Resolution (special circumstances) • Developer Extension • Utility Project

    21. ULID • One or more customers express interest for sewers in a particular area • IF there appears to be sufficient interest (51% or more by land ownership), petitions are prepared (estimated costs) • IF the minimum of 51% of the land owner sign in favor of the formation, the Board may Certify the petitions and authorize preliminary design

    22. ULID (continued) • Formation Hearing (new cost estimates and boundaries may be redefined as a result) • IF there is still support for the ULID, the Board can certify the ULID formation (Protest can still be filed) • Project is designed and Bid - ONLY PUBLIC FACILITIES • Financing will be reviewed (new cost estimates) and Construction begins

    23. ULID (continued) • Final Costs are known and assessed • Assessment Roll Hearing (Protest can be filed and allocation method can be revised) • Legal notice of Assessment (appealable through supreme court) • Assessments filed with County Treasurer for collections • Assessments begin one year later and continue for 20 year

    24. ULID (continued) • Once Public Facilities are in place, Billing for Sewer service begin, every two months (regardless of whether properties have connected) • Time Frame for ULID Process • Past experience: 1-1/2 to 3 years • Pressure Option may be on the shorter side • Gravity Option maybe on the longer side

    25. Examples of Financing Costs (ULID Assessments): Based on Per Area Charge:

    26. Examples of Initial Costs: Based on Area Charge And ULID Financing: Total Infrastructure Cost / 80 Acres and assuming a 1/2 Acre Lot

    27. Developer Extension • If a large property subdivides to sufficient density to preclude septic system and needs sewer, the development could build a portion of the infrastructure. • Latecomer Charges could be allocated to neighboring properties for the portion of the infrastructure that would benefit them • Latecomer Charges are paid at the time of connection

    28. Utility Project • If there is benefit to the District as a whole to install sewers in advance, the District could do so. • Not typical • Examples: • Financial - increase customer base • Environmental benefits • Opportunity costs (minimize future installation costs) • prior to new road • combination with other projects

    29. Area of Interest DRAFT Lakota Beach Area Total Area: ~105 Acres Property Area: ~80 Acres Tax Lots: ~135