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2015 General Sewer Plan Update 2015 GENERAL SEWER PLAN UPDATE April 2016 Prepared by J-U-B ENGINEERS, Inc. 2810 W. Clearwater Ave. Ste. 201 Kennewick, WA 99336 2015 GENERAL SEWER PLAN UPDATE April 2016 Certification This 2015 General Sewer Plan Update (with exception of Chapter’s 5 and 8) for the City of Richland has been prepared under the direction of the following Registered Professional Engineers. In compliance with the Washington Department of Ecology Requirements for General Sewer Plans, WAC 173-240-050. Preliminary Alex J. Fazzari, P.E. J-U-B ENGINEERS, INC. 2810 W. Clearwater Ave., Ste 201 Kennewick, WA 99336 (509) 783-2144 2015 GENERAL SEWER PLAN UPDATE April 2016 Certification Chapter 5 of this 2015 General Sewer Plan Update for the City of Richland has been prepared under the direction of the following Registered Professional Engineer. In compliance with the Washington Department of Ecology Requirements for General Sewer Plans, WAC 173-240-050. Alan J. Straub, P.E. Carollo Engineers, Inc. 1218 Third Ave., Ste 100 Seattle, WA 98901 (206) 684-6532 TABLE OF CONTENTS EXECUTIVE SUMMARY ............................................................................................................................................... 1 ES-1 Purpose ................................................................................................................................................... 1 ES-2 Planning Boundaries ............................................................................................................................... 2 ES-3 Collection System Summary .................................................................................................................... 2 ES-4 Capital Improvement Plan Summary ....................................................................................................... 5 ES-5 Budgeting CIP Projects.......................................................................................................................... 10 – Introduction ........................................................................................................................................... 1-1 1.1 Background ........................................................................................................................................... 1-1 1.2 Related Plans ........................................................................................................................................ 1-1 1.2.1 City of Richland Comprehensive Land Use Plan ..................................................................... 1-1 1.2.2 Benton County Comprehensive Plan ...................................................................................... 1-1 1.2.3 City of Kennewick .................................................................................................................... 1-2 1.2.4 City of West Richland ............................................................................................................. 1-2 1.3 Study Scope .......................................................................................................................................... 1-2 1.4 System Overview ................................................................................................................................... 1-4 – Planning Information ............................................................................................................................ 2-1 2.1 Planning Area ........................................................................................................................................ 2-1 2.2 Service Area .......................................................................................................................................... 2-1 2.2.1 Onsite Sewer Systems ............................................................................................................ 2-1 2.3 Service Area Characteristics ................................................................................................................. 2-3 2.3.1 Topography ............................................................................................................................. 2-3 2.3.2 Climate .................................................................................................................................... 2-3 2.3.3 Geology ................................................................................................................................... 2-3 2.3.4 Soils ........................................................................................................................................ 2-4 2.4 Irrigation Districts ................................................................................................................................... 2-6 2.5 Domestic Water System ........................................................................................................................ 2-6 2.6 Water Reclamation and Reuse .............................................................................................................. 2-9 2.7 Zoning/Land Use ................................................................................................................................... 2-9 2.8 FEMA Floodway Mapping.................................................................................................................... 2-13 2.9 Service Area Policies ........................................................................................................................... 2-13 2.9.1 Wastewater Service Rates .................................................................................................... 2-13 2.9.2 Wastewater Service Connection Fees .................................................................................. 2-13 2.10 Growth Management Act Compliance ................................................................................................. 2-14 2.11 Population ............................................................................................................................................ 2-14 2.12 Badger Mountain Area Master Planning .............................................................................................. 2-15 – Flow and Load Analysis ....................................................................................................................... 3-1 3.1 Introduction ............................................................................................................................................ 3-1 3.2 Existing Influent WWTP Flow & Loads .................................................................................................. 3-1 3.2.1 Flows ....................................................................................................................................... 3-1 3.2.2 Biochemical Oxygen Demand (BOD) ...................................................................................... 3-3 3.2.3 Total Suspended Solids (TSS) ................................................................................................ 3-5 3.2.4 Total Kjeldahl Nitrogen (TKN) ................................................................................................. 3-8 3.2.5 Total Phosphorus (TP) .......................................................................................................... 3-10 CITY OF RICHLAND // 2015 GENERAL SEWER PLAN UPDATE // APRIL 2016 Page i EXECUTIVE SUMMARY 3.2.6 Summary of Current Flows and Loads .................................................................................. 3-10 3.3 Projected Flow and Loads for Year 2035 ............................................................................................ 3-12 3.4 Summary of Flow Contributions and Sources ..................................................................................... 3-17 3.5 Large Non-Residential Flows ............................................................................................................... 3-18 3.6 Infiltration and Inflow ............................................................................................................................ 3-20 – Performance and Design Criteria ........................................................................................................ 4-1 4.1 City Standard Specifications and Standard Drawings ........................................................................... 4-1 4.2 Collection System Design Criteria for Master Planning ......................................................................... 4-1 4.3 Discharge Standards ............................................................................................................................. 4-2 4.3.1 Federal Water Quality Standards ............................................................................................ 4-2 4.3.2 Washington State Surface Water Quality Standards (WQS) ................................................... 4-2 4.3.3 Future TMDLs ......................................................................................................................... 4-4 4.3.4 Existing Discharge Standards ................................................................................................. 4-5 4.4 Expected Future Discharge Standards .................................................................................................. 4-6 – Wastewater Treatment Plant...............................................................................................................
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