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  • SIMPLE - Problem Statement
    Alternatives Waste Water Whole of Government Life Cycle AM Processes SAM Practitioner Tools Contents Reports Case Studies Case Studies Industry Drinking Water Seattle Public Utilities Problem Statement The Maple Leaf 530 pressure zone contains the greatest number of customers with pressures below 20 pounds per square inch psi of any pressure zone in the Seattle Public Utilities SPU water distribution system Under peak hourly demand PHD conditions the pressure zone contains 27 service connections with pressure below 20 pounds per square inch psi plus an additional 440 service connections with pressure between 20 and 30 psi The Washington Administrative Code WAC requires a minimum 20 psi at all service connections The SPU Distribution System Pressure Policy approved in December 2004 requires service connections with pressure below 20 psi to be raised to at least 20 psi and also provides for raising the pressures of customers below 30 psi to at least 30 psi if the benefits exceed the costs of raising the pressure The low pressures in the Maple Leaf 530 pressure zone are caused by the low elevation of Maple Leaf Tank relative to the higher elevation area located several blocks to the north At its minimum operating level of 515 feet the water level in Maple Leaf Tank is only 43 feet above the highest elevation services which are at elevation 472 feet This equals under static zero flow conditions a minimum pressure of 18 6 psi Unlike in other low pressure areas the watermains in the Maple Leaf 530 low pressure areas are all cement mortar lined so excessive friction losses during peak demands are not a contributing factor to the low pressure problem A map showing the distribution of pressures in the Maple Leaf 530 pressure zone under peak hourly demand conditions is shown in Figure

    Original URL path: http://simple.werf.org/Books/Contents/Reports,-Case-Studies/Case-Studies/Industry/Drinking-Water/Project-Development-Plan---Maple-Leaf-Tank,-Seattl/Problem-Statement (2016-05-01)
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  • SIMPLE - Objectives
    Asset Management Asset Management Guidelines Develop an Improvement Plan Reports Case Studies Reports Case Studies Industry Drinking Water City of Atlanta Palm Beach County Seattle Public Utilities Executive Summary Problem Statement Objectives PDP Approach History Status Quo Alternatives for Increasing Pressure and Fire Flow Comparison of Alternatives Waste Water Whole of Government Life Cycle AM Processes SAM Practitioner Tools Contents Reports Case Studies Case Studies Industry Drinking Water Seattle Public

    Original URL path: http://simple.werf.org/Books/Contents/Reports,-Case-Studies/Case-Studies/Industry/Drinking-Water/Project-Development-Plan---Maple-Leaf-Tank,-Seattl/Objectives (2016-05-01)
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  • SIMPLE - PDP Approach
    Contents GASB 34 The 10 Steps to Asset Management Asset Management Guidelines Develop an Improvement Plan Reports Case Studies Reports Case Studies Industry Drinking Water City of Atlanta Palm Beach County Seattle Public Utilities Executive Summary Problem Statement Objectives PDP Approach History Status Quo Alternatives for Increasing Pressure and Fire Flow Comparison of Alternatives Waste Water Whole of Government Life Cycle AM Processes SAM Practitioner Tools Contents Reports Case Studies Case Studies Industry Drinking Water Seattle Public Utilities PDP Approach This PDP addresses the low pressure and associated low fire flow in the Maple Leaf 530 pressure zone by addressing the future of Maple Leaf Tank The following questions are considered in this PDP Are the low pressure and associated low fire flow problems in the Maple Leaf 530 zone best improved by operating an upgraded tank with a higher minimum operating level replacing the tank with a new higher tank or decommissioning the tank entirely What benefits if any are provided by the current storage volume in Maple Leaf Tank Will decommissioning the tank require any mitigating improvements to be made elsewhere in the Maple Leaf 530 pressure zone Does constructing a booster pump station and sub pressure zone

    Original URL path: http://simple.werf.org/Books/Contents/Reports,-Case-Studies/Case-Studies/Industry/Drinking-Water/Project-Development-Plan---Maple-Leaf-Tank,-Seattl/PDP-Approach (2016-05-01)
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  • SIMPLE - History
    to Asset Management Asset Management Guidelines Develop an Improvement Plan Reports Case Studies Reports Case Studies Industry Drinking Water City of Atlanta Palm Beach County Seattle Public Utilities Executive Summary Problem Statement Objectives PDP Approach History Status Quo Alternatives for Increasing Pressure and Fire Flow Comparison of Alternatives Waste Water Whole of Government Life Cycle AM Processes SAM Practitioner Tools Contents Reports Case Studies Case Studies Industry Drinking Water Seattle Public Utilities History When Maple Leaf Tank was constructed in 1949 it was located at the northern Seattle city limits NE 85th Street The maximum elevation in the pressure zone it served was 445 feet Roosevelt Way and NE 86th Street which receives 30 psi with the tank at its minimum operating level of 515 feet At the time of the tank construction the higher elevation area north of the tank was part of a separate water district After Seattle was expanded north in 1954 to NE 145th Street the higher elevation area became part of the pressure zone served by the Maple Leaf Tank At the maximum ground elevation of 472 feet the tank provides less than 20 psi at its minimum operating level Thus after only five years

    Original URL path: http://simple.werf.org/Books/Contents/Reports,-Case-Studies/Case-Studies/Industry/Drinking-Water/Project-Development-Plan---Maple-Leaf-Tank,-Seattl/History (2016-05-01)
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  • SIMPLE - Status Quo
    of 11 800 gpm exceeds the PHD rate of 3 200 gpm there is no need for equalizing storage in the Maple Leaf 530 pressure zone Fire Suppression Storage Fire flow storage is the volume required to meet the highest required fire flow rate in the service area for the required duration at a minimum 20 psi For the commercial areas in the Maple Leaf 530 pressure zone the planning level fire flow requirement is 4 000 gpm for 4 hours or 960 000 gallons This volume is not currently met in Maple Leaf Tank which has only 460 000 gallons available to supply 20 psi It is met however at the other storage facilities serving the pressure zone as listed in Table 4 below Table 4 Available Storage to Maple Leaf 530 Pressure Zone Storage Facility Storage Volume MG Supplies Maple Leaf Tank 0 5 directly supplies zone Lake Forest Park Reservoir 60 Roosevelt Way RCBV Maple Leaf Reservoir 60 Roosevelt Way PS Roosevelt Turbine View Ridge Reservoir 2 5 View Ridge High Service Pump Total 123 Because the fire suppression storage volume is met at Lake Forest Park Maple Leaf and View Ridge Reservoirs it is not needed in the Maple Leaf Tank Standby Storage Standby storage is the emergency backup storage needed when supply is interrupted to the area served by the storage facilities Standby storage needs to deliver water at a minimum pressure of 20 psi The Water System Design Manual contains formulas for determining minimum standby storage volumes for a water service area and recommends a minimum 200 gallons per equivalent residential unit ERU a measure of water consumption Because the available supplies to the Maple Leaf 530 zone greatly exceed the demand the minimum standby storage volume applies For the Maple Leaf 530 pressure zone which contains approximately 8 400 ERUs this standby storage calculation equals 1 7 MG The standby and fire suppression storage volumes can share the same storage volume so the total storage volume needed in the Maple Leaf 530 pressure zone is equal to the standby storage volume of 1 7 MG This volume is met at Lake Forest Park Maple Leaf and View Ridge Reservoirs Reliability of Sources of Supply Because most of the storage volume needed in the Maple Leaf 530 pressure zone is outside of the zone having that storage available is dependent on the reliability of each of the sources of supply to the zone Factors affecting the reliability of each of these sources are discussed below Roosevelt Way 16 inch Remote Controlled Ball Valve RCBV The Roosevelt Way RCBV can supply Tolt water from Lake Forest Park Reservoir or Cedar water from Maple Leaf Reservoir Tolt water is delivered by gravity via the 550 Pipeline As long as the 550 Pipeline is in service and can provide sufficient head Tolt water is directly available to the pressure zone Cedar water is pumped at Maple Leaf Pump Station which has a backup generator that is manually

    Original URL path: http://simple.werf.org/Books/Contents/Reports,-Case-Studies/Case-Studies/Industry/Drinking-Water/Project-Development-Plan---Maple-Leaf-Tank,-Seattl/Status-Quo (2016-05-01)
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  • SIMPLE - Alternatives for Increasing Pressure and Fire Flow
    Tank and Raise Minimum Operating Level to 525 feet Replace Maple Leaf Tank with Higher Tank Decommission Tank and Serve Directly from 550 Pipeline Serve Low Pressure Customers with Separate Booster Pump Zone Comparison of Alternatives Waste Water Whole of Government Life Cycle AM Processes SAM Practitioner Tools Contents Reports Case Studies Case Studies Industry Drinking Water Seattle Public Utilities Alternatives for Increasing Pressure and Fire Flow There are three general alternatives for increasing pressure and fire flow in the Maple Leaf 530 pressure zone low pressure area Upgrade the Tank Install recirculation improvements to allow the tank to be operated at a higher minimum operating level without sacrificing water quality This alternative assumes that the existing tank will need to be seismically upgraded and recoated Replace the Tank Demolish the existing tank and replace with a higher tank that provides at least 30 psi to all customers in the Maple Leaf 530 Pressure Zone Decommission the Tank Decommission or demolish the existing tank and serve the Maple Leaf 530 pressure zone directly from the 550 Pipeline and other sources of supply The tank would no longer serve as a water storage facility The first two alternatives upgrade or replace

    Original URL path: http://simple.werf.org/Books/Contents/Reports,-Case-Studies/Case-Studies/Industry/Drinking-Water/Project-Development-Plan---Maple-Leaf-Tank,-Seattl/Alternatives-for-Increasing-Pressure-and-Fire-Flow (2016-05-01)
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  • SIMPLE - Comparison of Alternatives
    Asset Management Effective Implementation Asset Management for Small Utilities Interactive Training Practitioner Contents GASB 34 The 10 Steps to Asset Management Asset Management Guidelines Develop an Improvement Plan Reports Case Studies Reports Case Studies Industry Drinking Water City of Atlanta Palm Beach County Seattle Public Utilities Executive Summary Problem Statement Objectives PDP Approach History Status Quo Alternatives for Increasing Pressure and Fire Flow Comparison of Alternatives Waste Water Whole of

    Original URL path: http://simple.werf.org/Books/Contents/Reports,-Case-Studies/Case-Studies/Industry/Drinking-Water/Project-Development-Plan---Maple-Leaf-Tank,-Seattl/Comparison-of-Alternatives (2016-05-01)
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  • SIMPLE - Drinking Water Reports
    Asset Management Help Me Project Background How to use SIMPLE What is SIMPLE Getting Started Pathways to Asset Management Effective Implementation Asset Management for Small Utilities Interactive Training Practitioner Contents GASB 34 The 10 Steps to Asset Management Asset Management Guidelines Develop an Improvement Plan Reports Case Studies Reports Drinking Water Reports Case Studies SAM Practitioner Tools Contents Reports Case Studies Reports Drinking Water Reports Drinking Water Reports Click here

    Original URL path: http://simple.werf.org/Books/Contents/Reports,-Case-Studies/Reports/Drinking-Water-Reports (2016-05-01)
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