Winchester Municipal Utilities March 6, 2014
• Introduction • Basis for Design Capacity • Raw Water Supply • Raw & Finished Water Transmission Mains • Hydraulic Analysis • Water Treatment Plant • Conclusions & Recommendations • Schedule
Introduction Technical Memorandum #1 presents the following results & recommendations: Reviews past studies, including the 2009 Hazen & Sawyer (H&S) Water System Planning Study (WSPS), and a series of technical memoranda prepared by Black & Veatch, Commonwealth Technology and Baldwin Engineering Evaluates and recommends raw water supply alternatives
Introduction Technical Memorandum #1 presents the following results & recommendations: Evaluates and recommends raw water intake and pump station improvements Evaluates and recommends raw and finished water transmission main improvements Provides an updated opinion of probable construction cost and schedule for the proposed water system improvements
Basis for Design Capacity Scope of TM#1 did not include a detailed evaluation of existing water demands TM#2 prepared in 1997 evaluated population projections and future demands through the year 2000 TM#4 projected water demands through 2020 H&S study reports actual water demands, “have not achieved the projected demands from the 1997 TM”
Basis for Design Capacity H& S study indicates ultimate design capacity of the new WTP to be 12.0 mgd Recorded maximum daily water demands have exceeded 5.0 mgd since 2005 WMU has committed to provide additional water to local industry in the amount of 1.0 mgd
Basis for Design Capacity Bell recommends the first phase of construction include a design capacity of 9.0 mgd Allows for further residential & industrial growth Includes incremental increases of 3.0 mgd over 2 phases which is more practical and economical Current bidding climate and economy has resulted in a flat line of recent bidding and bonding for treatment facilities
Kentucky River Pool 10 The Kentucky River is and will remain the primary source of drinking water for WMU’s system WMU is permitted by KY DOW to withdraw 15.0 million gallons per day (mgd)
Carroll Ecton Reservoir Currently supplemented by the Kentucky River Intake Pump Station Leaking impoundment structure Amount of leakage unknown, estimated over 1.0 mgd Geotechnical & structural investigations required to determine cause of leakage and required improvements Continued recreational use: Pumping to supplement water loss will be required Power costs estimated to be approximately $38,281 per year at current rates
Carroll Ecton Reservoir Continued use as backup water supply: Water quality is acceptable during colder months Thermal stratification and oxygen depletion occur in warmer months Aeration & mixing system would be recommended at an approximate cost of $500,000
Carroll Ecton Reservoir Raw water is currently pumped through an 18-inch raw water transmission main to maintain Reservoir levels Existing transmission main would need to serve dual- purpose Water supply line transporting water from the Kentucky River to the Reservoir Reverse flow and transport water from the Reservoir to the new WTP site
Carroll Ecton Reservoir Summary of Project Costs – Carroll Ecton Backup Water Supply Item Description Estimated Cost Power Cost to Supply 1.0 mgd to Carroll Ecton Reservoir $38,281/Year Project Costs for Improvements to Maintain Backup $2,188,000 Water Supply
Raw Water Intake & Pump Station Existing raw water intake structure was designed to pump 15.0 mgd with four pumps in service To reliably pump 9.9 mgd to the new WTP an additional pump similar to the existing pumps needs to be installed When demands require more than 9.9 mgd, a fourth pump will need to be installed to maintain redundancy in the system
Raw Water Intake & Pump Station Summary of Project Costs – Raw Water Intake Improvements Item Description Estimated Cost Installation of Vertical Turbine Pump & Appurtenances $600,000 Electrical, Control & HVAC Improvements $440,000 Project Development (25%) $260,000 TOTAL OPINION OF PROBABLE PROJECT COSTS $1,300,000 *Project development costs are based on a percentage of construction costs.
Recommendations We recommend the following raw water intake improvements: Install a third duty pump Install a second transformer Install a soft starter for Pump #3 Install a fused switch to power the future Pump #4 starter Upgrade the HVAC systems Install a pump control valve in lieu of a VFD
Raw Water Transmission Main Alternative Evaluation Velocities (6.0 mgd, 30-inch, < 2 fps) O&M requirements Constructability Capitol cost Present worth Recommendations Construct 12,000 l.f. of 24-inch ductile iron pipe
Raw Water Transmission Main Summary of Project Costs – 24-Inch Ductile Iron Raw Waterline Item Description Estimated Cost Installation of 12,000 l.f. of 24-Inch Ductile Iron Pipe $2,220,000 Project Development (25%) $550,000 TOTAL OPINION OF PROBABLE PROJECT COSTS $2,750,000 Power Costs $554,683/Year Salvage Value @ 50 Years $0 Present Worth $14,665,000 *Project development costs are based on a percentage of construction costs.
Finished Water Transmission Main Alternative Evaluation Velocities (6.0 mgd, 30-inch, < 2 fps) O&M requirements Constructability Capitol cost Present worth Recommendations Construct approximately 36,000 l.f. of 24-inch ductile iron pipe
Finished Water Transmission Main Summary of Project Costs – 24-Inch Ductile Iron Finished Waterline Item Description Estimated Cost Installation of 36,000 l.f. of 24-Inch Ductile Iron Pipe $6,660,000 Project Development (25%) $1,665,000 TOTAL OPINION OF PROBABLE PROJECT COSTS $8,325,000 Power Costs $580,700/Year Salvage Value @ 50 Years $0 Present Worth $20,798,000 *Project development costs are based on a percentage of construction costs.
Hydraulic Analysis Hydraulic Characteristics for Raw Water Pipeline Alternatives Raw Water Transmission Main Pressure (psi) at RWI Location 24-Inch 30-Inch 24 & 30-Inch RWI – Ex. WTP @ 6.6 mgd 175 N/A 171 RWI – New WTP @ 6.6 mgd 158 155 N/A RWI – New WTP @ 9.9 mgd 165 158 N/A Existing pressure at RWI 215 psi Flow control valves eliminate negative pressures Air release valves required Surge control valve at RWI to reduce pressure surges
Hydraulic Analysis Hydraulic Characteristics for Finished Water Pipeline Alternatives Finished Water Transmission Main Pressure (psi) at Bypass Connection Location Ex. 18” & Ex. 18” & Ex. 12” & 18” New 24” New 30” Ex. WTP @ 3.9 mgd 52 56 56 Ex. WTP @ 6.0 mgd N/A 67 68 New WTP @ 6.0 mgd N/A 67 68 New WTP @ 9.0 mgd N/A 95 95 Existing pressure at Bypass 52 psi
Recommendations We recommend the following transmission main improvements: Division A – Raw Water Intake to New WTP Site Install approximately 12,000 l.f. of 24-inch ductile iron transmission main Division B – New WTP to Existing WTP Install approximately 21,000 l.f. of 24-inch ductile iron transmission main Division C – Existing WTP to Bypass Install approximately 15,000 l.f. of 24-inch ductile iron transmission main
Water Treatment Plant Opinion of Probable Project Costs – New 9.0 mgd Winchester WTP Item Description Estimated Cost Treatment Processes & Facilities $17,515,000 Site Work & Yard Piping $1,571,000 Electrical, Instrumentation & Controls $3,859,000 HVAC, Fire, Plumbing & Miscellaneous $915,000 $23,860,000 TOTAL OPINION OF PROBABLE CONSTRUCTION COSTS Project Development (25%) $5,965,000 TOTAL OPINION OF PROBABLE PROJECT COSTS $29,825,000 *Project development costs are based on a percentage of construction costs.
Recommended Improvements Opinion of Probable Project Costs – Recommended Improvements Item Description Estimated Cost Raw Water Intake & Transmission Main Improvements $9,920,000 New 9.0 mgd Water Treatment Plant $23,860,000 TOTAL OPINION OF PROBABLE CONSTRUCTION COSTS $33,780,000 Work Orders No. 7 & 8 Engineering Fees* $875,000 Project Development Costs (25% of WTP) $5,965,000 TOTAL OPINION OF PROBABLE PROJECT COSTS $40,620,000 *Fees associated with RWI & Transmission Mains.
Recommended Improvements Opinion of Probable Project Costs Including Carroll Ecton $42,370,000 The estimated project development costs of $5,965,000 include the following associated with the WTP: Construction contingency Allowances Engineering fees WMU costs
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