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Th e Kalispell WWFPU provides a guide for short-term, near- term, and long-term capital improvements that will be the basis for planning, fi nancing, designing, constructing, and implementating of solutions to meet the City’s foreseeable collection system needs for years to come. As the City cycles through the planning process, some uncertainties and changes can be expected. However, the approach methodology and investment the City has made in this planning eff ort provides City staff with a proactive planning approach for responding to future challenges and maintaining a clear vision and consistent direction for the Utility! SUSTAINABLE WASTEWATER UTILITY Prepared By: ADVANCED ENGINEERING AND ENVIRONMENTAL SERVICES, INC. 690 N Meridian Rd, Suite 218 Kalispell, MT 59901 I (406) 257-8990 WASTEWATER Facility Plan Update Executive Summary JUNE 2019 ---PAGE BREAK--- 93 DESIGN & CONSTRUCTION SUSTAINABLE WASTEWATER UTILITY PROACTIVE PLANNING UNDERSTANDING OF THE EXISTING SYSTEM MODEL UPDATE & CALIBRATION SYSTEM EVALUATION CAPITAL IMPROVEMENTS PLANNING INTRODUCTION Proactively addressing system challenges is critical to ensure sustainable system operations. Wastewater system challenges come in many forms including population growth, aging infrastructure, increased regulatory requirements, emerging technological trends, and eff ective capital improvements planning. Th e Wastewater Facility Plan Update (WWFPU) provides a guide for short-term (0-5 years), near-term (5-15 years), and long-term (15+ years) capital improvements to the City of Kalispell’s (City) municipal wastewater collection system. Th e recommended improvements included in the Capital Improvements Plan (CIP) will be the basis for future planning, fi nancing, designing, constructing, and implementation of solutions to meet the City’s collection system needs. Th is document serves as an Executive Summary to the 2019 Kalispell WWFPU report. Short-Term CIP Project Categories & Opinion of Probable Project Cost (OPPC) Facility Type Existing Additional Facility Improvements Gravity Main (Miles) 120 47 Miles of New Gravity Main Ranging 8” to 36” Force Main (Miles) 25 10 Miles of New Force Main Ranging 4” to 12” Lift Stations 36 21 New Lift Stations (5 Regional with 16 Growth and Development) Proposed Collection System Improvements to Serve FBO Conditions Th e hydraulic model was used to develop the infrastructure necessary to serve the FBO. A summary of improvements necessary to provide wasterwater service for the FBO planning horizon include: $0 $2,000,000 $4,000,000 $6,000,000 $8,000,000 $10,000,000 $12,000,000 $14,000,000 $16,000,000 $18,000,000 FY 2019 FY 2020 FY 2021 FY 2022 FY 2023 Gravity & Force Main Gravity Main Lift Station Upgrades LS, Gravity & Force Main Rehabilitation & Repair Studies Growth & Development LS & Gravity Main Optimization ---PAGE BREAK--- (9(5*5((1 (9(5*5((1 ttd& $ $ )R\V/DNH 2OG5HVHUYH'5 )DUPWR0DUNHW5' :KLWHILVK6WDJH5' )XOO%XLOG2XW )RUFH0DLQ *UDYLW\ *URZWK Short-Term Proposed Capital Improvements City of Kalispell WWFPU Executive Summary I Page 13 : K LW HIL VK 5 L Y HU 6WLOOZDWH U 5 LYH U $ VKOH\ &UHHN )ODWKH DG 5LYHU ϮϮ Ϯϵ ϯϰ ϭϯ ϯϯ ϮϬ ϭϲ ϱ Ϯ Ϯϯ ϯϴ ϯϱ ϭϱ ϴ ϯϲ ϭϭ ϯϬ ϰ ϯ ϭϬ ϳ ϭϮ ϵ ϯϵ ϲ Ϯϱ s Z'Z E ϭϴ ϯϮ ϰϭ ϭ ϯϳ Ϯϭ ϯϭ Ϯϳ ϰϬ ϭϳ ϱ ϭϰ ttd& $ $ )R\V/DNH 2OG5HVHUYH'5 )DUPWR0DUNHW5' :KLWHILVK6WDJH5' )XOO%XLOG2XW ZDWHU0DLQ7\SH )RUFH0DLQ *UDYLW\ DWHU 6HUL FH $UHD SUBSTANTIAL AREA GROWTH Steady growth and development will continue to increase wastewater flows which will require the City to upgrade existing or add new infrastructure to meet their future needs. INFLOW & INFILRATION (I/I) CONSIDERATIONS AGING INFRASTRUCTURE Inflow and Infiltration also known as I/I is a term used to describe the ways that groundwater and stromwater enter into a sanitary sewer system. Currently, the City experiences I/I which increases both peak flows and volumes which reduces the ability of the sanitary sewer and treatment facilities to transport and treat wastewater. Portions of the City’s sanitary sewer system are reaching their expected useful life. The oldest portions of the system were installed 80 years ago and replacing those pipes is costly. City of Kalispell WWFPU Executive Summary I Page 2 UNDERSTANDING OF THE EXISTING SYSTEM SYSTEM CHALLENGES Th e City’s existing wastewater collection and treatment system services approximately 22,800 people and includes around 145 miles of sewer pipeline, 36 sewer lift stations, and an advanced wastewater treatment facility. )XOO%XLOG2XW )RUFH0DLQ *UDYLW\ (YHUJUHHQ .DOLVSHOO ---PAGE BREAK--- City of Kalispell WWFPU Executive Summary I Page 3 PROACTIVE PLANNING 0 2,000 4,000 6,000 8,000 10,000 12,000 14,000 16,000 18,000 20,000 0 10,000 20,000 30,000 40,000 50,000 60,000 70,000 80,000 90,000 1960 1970 1980 1990 2000 2010 2016 2020 2023 2030 2033 2040 2050 2060 2068 Acres Developed Population Year Establishing Planning Periods Th e establishment of planning periods is a critical component in the development of the WWFPU. A total of three planning periods were established, including a short-term, near- term, and a long-term period. For this report, full build-out (FBO) was assumed to coincide with the Annexation Boundary policy, and as shown in the fi gure on the next page. For this planning effort, a 2.0 percent annual growth rate is used to estimate future population projections, which is consistent with the rate currently utilized by the City’s Planning Department. Future wastewater flows for each planning period was then calculated and used to determine future infrastructure need and anticipated project timing. RESIDENTIAL PLANNING DENSITIES The City Planning Department used average densities to assign the number of residential DU to each area depending on future land use. • Suburban Residential = 3 DU / Acre • Urban Residential = 8 DU / Acre • High-Density Residential = 10 DU / Acre The fi gure on the following page contains the number of added dwelling units, commercial acres, and industrial acres for each respective planning period. SHORT-TERM GROWTH 0-5 YEARS (2018 – 2023) LOOKING AT GROWTH AND FLOWS MULTIPLE WAYS NEAR-TERM GROWTH 5-15 YEARS (2023 – 2033) LONG-TERM GROWTH 15+ YEARS (2033-Beyond) UNDERSTANDING FUTURE GROWTH A collaborative approach which involved City Planning was used to determine anticipated areas of future growth as well as redevelopment for each planning period. These areas identifi ed by City Planning staff were then populated with estimated residential dwelling units (DU) and developable commercial and industrial acres. Short-Term Near-Term Long-Term Acres Developed Historical Population Average Annual Growth 2.00% Growth - Planning Historical Polynomial Trend City of Kalispell WWFPU Executive Summary I Page 12 Short-Term Capital Improvement Projects Project Category OPPC Lift Station #3 Main Improvements Gravity & Force Main $ 3,763,384 Lift Station #9 Improvements LS & Gravity Main $1,738,378 Rose Crossing West Improvements LS, Gravity & Force Main $2,081,737 Inflow and Infiltration (I/I) Study Studies $182,103 Risk-Based Sewer Rehab and Repair Projects (Total over 5 years) Rehabilitation & Repair $1,301,010 Growth and Development (Oversize Credit) Growth & Development $1,591,812 Existing City CIP "SEW 16" (6th Alley E - South of 14th to 13th Gravity Replacement) Rehabilitation & Repair $255,150 Existing City CIP "SEW 20" (10" Clay Sewer Slipline in 1st Alley W. from Montana St. to Washington St.) Rehabilitation & Repair $80,776 Existing City CIP "SEW 33" (Manhole Rehabilitation and Sewer Main Replacements/Repairs) Rehabilitation & Repair $260,202 Existing City CIP "SEW 52" (Misc. Sewer Contract Main Upsize and Lift Station Facility Enlargements) Growth & Development $234,182 Existing City CIP "SEW 55" (Westside Interceptor - Three Mile Dr. and Spring Creek Project) LS, Gravity & Force Main $13,612,312 Existing City CIP "SEW 68" (12" Clay Sewer Slipline in 1st Alley E. & W. Rehabilitation & Repair $232,565 Existing City CIP "SEW 70" (Slipline 8" Sewer Main in 6th Alley EN and E. Washington) Rehabilitation & Repair $79,675 Existing City CIP "SEW 72" (Lift Station Communication Upgrades) Optimization $40,400 Existing City CIP "SEW 74" (Grandview Lift Station #3 Relocation) Lift Station Upgrades $1,238,781 Existing City CIP "SEW 75" (Lift Station 5a Removal) Lift Station Upgrades $334,714 Existing City CIP "SEW 77" (Shop Complex Pavement Restoration) Rehabilitation & Repair $ 38,200 Existing City CIP "SEW 78" (Gravity Sewer Replacement on 4th Alley WN) Rehabilitation & Repair $1,064,754 Existing City CIP "SEW 79" (Gravity Sewer Replacement on 2nd Alley W) Rehabilitation & Repair $596,351 Existing City CIP "SEW 80" (Gravity Sewer Replacement on 5th Alley WN) Rehabilitation & Repair $817,968 Existing City CIP "SEW 82" (Gravity Sewer Replacement on 2nd Alley Rehabilitation & Repair $809,281 Existing City CIP "SEW 83" (Gravity Sewer Replacement on 1st and 2nd Ave. EN) Rehabilitation & Repair $1,203,825 Existing City CIP "SEW 89" (Facility Plan/Rate Analysis) Studies $268,148 Existing City CIP "SEW 91" (Repair and Replacement of Sewer Main) Rehabilitation & Repair $600,000 Existing City CIP "SEW 92" (Repair and Replacement of Sewer Main in WWTP Complex) Rehabilitation & Repair $159,554 CIPs identifi ed within this WWFPU were divided into short-term (0-5 year), near-term (5-15 year) and long-term (15+) timeframes. Specifi c project timing was determined using the hydraulic model, risk analysis, and anticipated system growth maps developed by the City Planning Department. Th rough the development of the WWFPU, three short- term construction projects were identifi ed that were not previously included in the City’s existing CIPs. Th e locations of these projects are shown in the fi gure on the following page. A summary including costs for the proposed short-term CIPs identifi ed within this WWFPU, as well as the City’s already identifi ed CIPs is included below. CIP TIMING AND IMPLEMENTATION Existing City CIP previously identifi ed by City Staff as a short-term project. Total Opinion of Probable Cost $32,585,262 ---PAGE BREAK--- City of Kalispell WWFPU Executive Summary I Page 11 Projects identifi ed for the Capital Improvement Plan (CIP) were divided into eight categories briefl y summarized below. Th e development of these categories provided the conceptual framework for CIP development, project prioritization and timeframe progressions, and correlated projects to the City’s present fi scal resources (i.e. what type of project makes the best use of the available capital improvement budget). CAPITAL IMPROVEMENTS PLANNING CONDITION ASSESSMENT CCTV should be used to identify high-risk degradation of a pipeline before failure, or to verify that there is viable life remaining in a segment of pipeline so that financial resources are spent strategically on its replacement or rehabilitation. REHABILITATION & REPAIR Rehabilitation and repair projects are generally associated with pipe segments that experience high break rates, significant leakage, are undersized (experience surcharging), or require frequent maintenance. GRAVITY MAIN Consists of upgrading existing gravity main or adding new future gravity main, which ensures the City maintains its current level of service and can adequately convey wastewater from existing and future customers. GROWTH & DEVELOPMENT Provide the necessary infrastructure to primarily serve future development. These projects consist of lift stations, gravity mains, and force mains. LIFT STATIONS Address both existing and future wastewater needs through upgrades or the addition of a new lift station. FORCE MAIN Consists of upgrading existing force main or adding new future force main to adequately convey wastewater away from lift stations to other parts of the collection system. OPTIMIZATION Improve network efficiency and movement or eliminate facilities to reduce operating costs and improve overall system performance. STUDIES Studies provide more detailed information so that the City can make informed decisions regarding the cost and timing of future projects. City of Kalispell WWFPU Executive Summary I Page 4 :K LW H ILVK 5LYHU 6WL O OZ D WH U 5LY H U $ VKOH\ &UHHN ) OD WK H DG 5LYHU $ $ )R\V/DNH 2OG5HVHUYH'5 )DUPWR0DUNHW5' :KLWHILVK6WDJH5' )XOO%XLOG2XW (YHUJUHHQ6HUYLFH$UHD