WTP Recycle PS Softening Lagoons Clearwell & Sedimentation Ozone Raw Water Storage Recarb Chemicals Filters CO 2 Clearwell Admin Finished Water Pumps Generator (Dec.‘20)
Generator Budget (Design/Construction): $3.2M FEMA/OEM Grant: ~$2.2M Expenditures to date: $1.4M
Finished Water Pump Station (FWPS) and Clearwell Replacement Design & Construction Budget: $17.7M Expenditures to date: $183k Replace Clearwell Ex. FWPS New FWPS
Residuals & Recycle PS Study, Analysis Budget: $380,000 Includes PS design Expenditures to date: $5k
Pilots, Evaluations, Design Pilot Systems Budget: $1.9M Expenditures to date: $1.5M Lime Chlorine
Due to so many needs, a draft Facilities Plan was prepared to identify upgrade and expansion options for the WTP at the current site…. Recycle PS Softening Lagoons Clearwell & Sedimentation Ozone RW Storage FiltersRecarb Chemicals Clearwell New chemical systems needed for distribution water quality Admin Finished Water stabilization. Pumps Generator (Dec.‘20) Facility or process with inadequate performance &/or inability to expand.
1. Facilities Plan Findings: Upgrade and Expand to 24mgd = $70 Million 2. Additional WTP Needs, roughly… Residuals/Recycle: $8M • FWPS/Clearwell: $18M • Admin/Lab/Elec: $6M • (+Future Replacements) • Total: >$100 Million Clearwell
Water Treatment Plant Upgrades, Replacements, Expansion Options KAW LAKE Stillwater WTP Kaw PS Kaw Raw Water Supply System Options
Rehab/Replace/Expand Existing Transition to New WTP - 2 Phases Transition to New WTP - 1 Phase Abandon Existing, Build New WTP • Rehab/Upgrade/ • Limited Rehab •Limited Rehab for • Acquire New Replace @ 18 for 18 MGD 18 MGD. WTP Site MGD • Acquire New •Acquire New WTP • Build New WTP, • Expand to 24 WTP Site Site 24 MGD MGD • Build Phase 1 of •Build New WTP, • Abandon Existing • Remain at New WTP, 12 24 MGD WTP existing site MGD •Abandon Existing • Build Phase 2 of WTP New WTP, 24 MGD • Phase out Existing WTP after Ph1 WTP is built Longer life at existing plant. Longer life at new plant.
Rehab/Replace : 2021-2024 Expand: 2038-2041 Blowers & Chemicals Rehab/Replace/Expand Existing • Rehab/ Upgrade/ SCU Replace @ Lagoons 18 MGD Recycle PS Shop SCU • Expand to Ozone Clearwelll New & Filters Recarb 24 MGD Raw Water • Remain at SCU Tank existing site • 50+ year Clearwell SCU Existing Facility life Existing Facility - Mods Existing Facility - Demo New Facility – Ph.1 New Facility – Ph.2 New Admin Repl. Facility – Future New FWPS New Paving Decommissioned Facility
• Limited Rehab/Upgrade/Expand Existing Rehab for 18 New WTP MGD Phase 1, 12 MGD • Acquire New WTP Site (2031-2034) • Build Phase 1 and 2 of New WTP, 12 MGD each New WTP • Phase out Phase 2, 12 MGD Existing WTP (2041-2044) after Ph1 WTP is built • 50+ Year Life critical need WTP location unknown
Rehab/Upgrade/Expand Existing • Limited Rehab for 18 MGD. • Acquire New WTP Site New WTP • Build New 24 MGD WTP, 24 (2031-2034) MGD • Abandon Existing WTP • 50+ Year Life critical need WTP location unknown
Rehab/Upgrade/Expand Existing • No existing WTP rehab • Acquire New WTP Site • Build New New WTP WTP, 24 24 MGD MGD (2021-2024) • Abandon Existing WTP • 50+ Year Life WTP location unknown
WTP Scenarios* 50 Year Present Values higher points = better Implementation Finished Water Risk to System Maintenance Operability Reliability Ease of Quality Value Scenario Total (Cost:Benefit Present Value, Benefit Ratio, Description 2020 Points normalized) $170 M 1 2 1 1 1 3 9 $1.26 1 Rehab/Upgrade/Expand Existing 2 Transition to New WTP, 2 Phases $260 M 2 3 2 3 2 1 13 $1.32 3 Transition to New WTP, 1 Phase $270 M 3 4 3 2 3 2 17 $1.05 4 Build New WTP, Abandon Old $320 M 4 1 4 4 4 4 21 $1.00 *These results are an indication of ranking and do not necessarily represent the degree of improvement from one option to another.
KAW LAKE High risk to make repairs Can’t take out of service for maintenance Past repair approach, in- Existing 36” WL line screens and chamfered bends lends to Stillwater WTP Kaw PS high risk investigations 6-7 mgd (short-term, emergencies) OSU WTP
Abandon Ex., New 42” WL, McMurtry for Coat/Repair Ex., Parallel Segments, Coat/Repair Ex., Construct Parallel 36” Backup Terminal Res. • Coat and Repair • Construct New 42” •Coat and Repair Existing 36” Water Water Line Existing 36” Water Line Line • Abandon Existing • Construct New 36” Water Line •Construct Parallel Parallel 36” Water Segments for High- • Expand Kaw Line Risk Areas pumping • Expand Kaw •Expand Kaw pumping • Construct McMurtry pumping Backup/Return •Build Terminal • Acquire Easements System Reservoir Backup/Return • Acquire Easements System •Acquire Easements
KAW LAKE New Parallel WL Coat/Repair Existing, Construct Parallel 36” • Coat and Existing WL Repair Existing 36” Water Kaw PS Stillwater WTP Line Increase • Construct New capacity Parallel 36” Water Line • Acquire Easements 6-7 mgd • Expand Kaw (short-term) pumping OSU WTP
LAKE McMURTRY New 42” WL KAW LAKE Abandon Existing, Construct New 42” WL, McMurty Backup • Construct New 42” Water Line Kaw PS Backup System Stillwater WTP • Abandon (315M gal., min. 15 Days) Increase Existing 36” capacity Water Line • Expand Kaw pumping • Construct 6-7 mgd McMurtry (short-term) Backup/ OSU WTP Return System • Acquire Easements
Terminal Reservoir Parallel High Risk Areas KAW LAKE Rehab/Upgrade/Expand Existing • Coat and Existing WL Repair Existing 36” Water Line Kaw PS Term Res Backup System Stillwater WTP • Construct (167M gal., min. 8 Days) Increase Parallel Segments for capacity High-Risk Areas • Expand Kaw pumping 6-7 mgd • Build Terminal (short-term) Reservoir Backup/Return OSU WTP System • Acquire Easements
Abandon Ex., New 42” WL, McMurtry for Coat/Repair Ex., Parallel Segments, Coat/Repair Ex., Construct Parallel 36” Backup Terminal Res. • Coat and Repair • Construct New 42” •Coat and Repair Existing 36” Water Water Line Existing 36” Water Line Line • Abandon Existing • Construct New 36” Water Line •Construct Parallel Parallel 36” Water Segments for High- • Expand Kaw Line Risk Areas pumping • Expand Kaw •Expand Kaw pumping • Construct McMurtry pumping Backup/Return •Build Terminal • Acquire Easements System Reservoir Backup/Return • Acquire Easements System •Acquire Easements
Raw Water Supply System Scenarios* 50 Year Present Values higher points = better Permitting/Rights Implementation Raw Water Operability Reliability Ease of Quality / Risk Present Value, Value Scenario 2020 Total (Cost:Benefit Benefit Ratio, Description Points normalized) Coat/Repair Ex., Construct 1 $140 M 3 3 3 3 3 15 $1.00 Parallel 36” Abandon Ex., Construct New 2 $160 M 2 1 2 1 1 7 $2.42 42” WL, McMurty Backup Coat/Repair Ex., Parallel 3 Segments, Terminal Res. $110 M 1 2 1 2 2 8 $1.51 Backup *These results are an indication of ranking and do not necessarily represent the degree of improvement from one option to another.
Microsoft Excel Worksheet
20,000,000 18,000,000 16,000,000 Gallons of Water 14,000,000 Annual Max Day 12,000,000 10,000,000 8,000,000 6,000,000 Annual Avg Day 4,000,000 2,000,000 0 1985 1990 1995 2000 2005 2010 2015 2020 2025 *OSU ended water purchases from Stillwater in Fall 2010.
10,000,000 8,000,000 Avg Day, December - March 6,000,000 4,000,000 2,000,000 0 1985 1990 1995 2000 2005 2010 2015 2020 2025 *OSU ended water purchases from Stillwater in Fall 2010.
drier period wetter period
Precipitation Chart 20,000,000 18,000,000 16,000,000 Gallons of Water 14,000,000 12,000,000 Annual Max Day 10,000,000 8,000,000 6,000,000 Annual Avg Day 4,000,000 2,000,000 0 1985 1990 1995 2000 2005 2010 2015 2020 2025
Population growth OSU changes Wholesale customer changes Drier/wetter periods, droughts Water loss / distribution system maintenance New industrial users, or changes to current industrial use
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