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Capacity Report 2020

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Capacity Report 2020 2020 CAPACITY REPORTS FLOWS & LOADINGS I&I/FLOW MONITORING CAPACITY ASSESSMENT 2020 CAPACITY REPORTS FLOWS & LOADINGS I&I/FLOW MONITORING CAPACITY ASSESSMENT PREFACE The Flows and Loadings Report is one of three related documents that are part of the annual process to monitor and evaluate capacity in the entire LOTT system. The intent, under LOTT’s Wastewater Resource Management Plan (also known as the Highly Managed Plan), is to assure that needed new capacity is brought on-line “just in time” to meet system needs. Capacity needs evaluated include wastewater treatment, Budd Inlet discharge, reclaimed water use/recharge, and conveyance capacity in the entire LOTT system. These three reports are prepared annually and are used to help identify capital projects for inclusion in the annual Capital Improvements Plan. Flows and Loadings Report – analyzes residential and employment population projections within the Urban Growth Area and estimates the impact on wastewater flows and loadings within the LOTT wastewater system. Inflow and Infiltration Report – uses dry and wet weather sewer flow monitoring results to quantify the amount of unwanted surface (inflow) and subsurface (infiltration) water entering the sewer system and to prioritize sewer line rehabilitation projects. Capacity Assessment Report – uses flows and loadings data and inflow and infiltration evaluation results to analyze system components (i.e. conveyance, treatment, and discharge), determine when limitations will occur, and provide a timeline for new system components and upgrades. As each report is published, it will be posted in the Library on LOTT’s website – www.lottcleanwater.org. 2019 Flows and Loadings Report i Table of Contents Executive Summary ....................................................................................................... iii 1. Introduction ............................................................................................................. 1 1.1 Purpose ........................................................................................................... 1 1.2 Data Elements ................................................................................................. 1 1.3 Modeling Software ........................................................................................... 1 1.4 Changes from Previous Reports ...................................................................... 1 2. Study Area .............................................................................................................. 2 2.1 Service Area .................................................................................................... 2 2.2 Current Sewered Area ..................................................................................... 3 2.3 Future Sewered Area ....................................................................................... 4 2.4 On-site Septic Systems .................................................................................... 7 3. Population and Employment Forecast .................................................................... 8 3.1 Projections ....................................................................................................... 8 3.2 Equivalent Residential Units ............................................................................ 9 3.3 New Connections ........................................................................................... 10 4. Flows and Loadings .............................................................................................. 12 4.1 Permit Requirements ..................................................................................... 12 4.2 Drinking Water Analysis ................................................................................. 12 4.3 Base Sanitary Flow ........................................................................................ 14 4.4 Comparison with Historical Wastewater Generation Rates ............................ 16 4.5 Flow Projections ............................................................................................ 17 4.6 Inflow and Infiltration Projections.................................................................... 17 4.7 Loading Projections ....................................................................................... 19 4.8 Projections Analysis ....................................................................................... 22 5. Summary .............................................................................................................. 26 2019 Flows and Loadings Report ii Executive Summary In accordance with the Wastewater Resource Management Plan, also known as the Highly Managed Plan, LOTT is continuously planning to ensure it maintains adequate operational capacity to meet the community needs. The primary goal of the annual Flows and Loadings Report is to define the current and projected wastewater characteristics of the LOTT service area in terms of both wastewater flows and pollutant constituents (loads). The information in this report was used to develop the 2019 Capacity Assessment Report and the 2021-2022 Capital Improvements Plan. The Thurston Regional Planning Council (TRPC) updates its population and employment projections every five years. The latest update was published in 2018. These projections were used to develop the flows and loadings included in this report. Additional data included flow monitoring data collected as part of LOTT’s inflow and infiltration evaluation program, timelines for sewering of non-sewered areas provided by each of the partner jurisdictions (Lacey, Olympia, and Tumwater), and updated current sewered areas. This report also includes a drinking water evaluation using 2018-2019 drinking water consumption data obtained from the jurisdictions. This analysis was used to recalibrate wastewater generation rate profiles for each of the jurisdictions. Generally, the projected flows and loadings are slightly reduced from the previous year. The reduction reflects year to year variability in the drinking water assessment, as well as refining the currently sewered area map. 2019 Flows and Loadings Report iii 1. Introduction 1.1 Purpose Accurate projections of future wastewater flows and loadings are essential in planning for new treatment capacity. In accordance with the Highly Managed Plan, LOTT is continuously monitoring and planning to assure that adequate new wastewater treatment capacity is available “just in time.” The primary goal of the annual Flows and Loadings Report is to define the current and projected wastewater characteristics of the LOTT service area in terms of both wastewater flows and pollutant constituents (loads). Flows and loadings projections cover the 31-year planning cycle (2019-2050) and will be used to evaluate the existing LOTT Capital Improvements Plan and develop recommendations for the timing of capacity related projects. 1.2 Data Elements Data used for the development of this report included wastewater flow monitoring data, sewered and non-sewered population projections, existing sewer lines, estimated timelines for sewering of non-sewered areas within the overall Urban Growth Area (UGA), and 2018-2019 drinking water consumption data. Flow data was collected at the Budd Inlet Treatment Plant and at various flow monitoring locations throughout the collection system. Population projections, updated in 2018, were obtained from the Thurston Regional Planning Council (TRPC) in the form of projected residential and employment populations per parcel. The estimated sewering timelines, drinking water consumption data, and existing collection system piping information were obtained from each of the partner jurisdictions (Lacey, Olympia, and Tumwater). 1.3 Modeling Software To develop the flows and loadings projections, the drinking water data was combined in Excel and then uploaded to a map of the parcels in Thurston County in a geographic information system (GIS) database. The drinking water data was allocated to its specific parcel, which contained population data and projections provided by TRPC. This combined data was exported and extrapolated in Excel. 1.4 Changes from Previous Reports This year’s projections were developed similarly to those developed in the 2018 Flow and Loadings Report. Drinking water data was collected from each of the partner jurisdictions, along with parcel identification numbers, rate classes, and units per parcel. This drinking water data was sorted, organized, and assigned to their respective parcels in GIS. The GIS map held other pertinent data for each parcel, including its physical location, drinking water basin, sewer basin, future sewer basin, and population projection data from TRPC. The raw drinking water data from the jurisdictions, along with the population projections from TRPC, were used to project future wastewater and loading production rates. In 2018, TRPC published population projections in the form of a GIS parcel file and included projected residential population for the years 2018, 2020, 2025, 2030, 2035, and 2040. This analysis used previous TRPC projections for employment and maximum density estimate (build out state) that were originally published in 2013. Population projections are discussed further in Section 3.1. 2019 Flows and Loadings Report 1 2. Study Area 2.1 Service Area The LOTT service area includes the urban growth areas (UGAs) for the cities of Lacey, Olympia, and Tumwater. The current combined UGA encompasses
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