Winchester Municipal Utilities March 6, 2014 Introduction - PowerPoint PPT Presentation

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