WTP Recycle PS Softening Lagoons Clearwell & Sedimentation - - PowerPoint PPT Presentation

Raw Water Storage Clearwell Filters Recarb Ozone Clearwell Finished Water Pumps Chemicals Admin Lagoons Recycle PS Generator (Dec.‘20)

WTP

CO2 Softening & Sedimentation

 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

 Budget: $1.9M  Expenditures to date: $1.5M Chlorine Lime Pilot Systems

New chemical systems needed for distribution water quality stabilization.

RW Storage Clearwell FiltersRecarb Ozone Clearwell Chemicals Admin Lagoons Recycle PS Generator (Dec.‘20)

Due to so many needs, a draft Facilities Plan was prepared to identify upgrade and expansion

• ptions for the WTP at the current site….

Finished Water Pumps Softening & Sedimentation

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 Raw Water Supply System Options

KAW LAKE

Stillwater WTP Kaw PS

Rehab/Replace/Expand Existing

• Rehab/Upgrade/

Replace @ 18 MGD

• Expand to 24

MGD

• Remain at

existing site

Transition to New WTP - 2 Phases

• Limited Rehab

for 18 MGD

• Acquire New

WTP Site

• Build Phase 1 of

New WTP, 12 MGD

• Build Phase 2 of

New WTP, 24 MGD

• Phase out

Existing WTP after Ph1 WTP is built

Transition to New WTP - 1 Phase

• Limited Rehab for

18 MGD.

• Acquire New WTP

Site

• Build New WTP,

24 MGD

• Abandon Existing

WTP

Abandon Existing, Build New WTP

• Acquire New

WTP Site

• Build New WTP,

24 MGD

• Abandon Existing

WTP

Longer life at existing plant. Longer life at new plant.

Rehab/Replace/Expand Existing

• Rehab/

Upgrade/ Replace @ 18 MGD

• Expand to

24 MGD

• Remain at

existing site

• 50+ year

life

Lagoons New FWPS New Admin Recycle PS

• Repl. Facility – Future

SCU Raw Water Tank Clearwelll Existing Facility Existing Facility - Mods Existing Facility - Demo New Facility – Ph.1 New Facility – Ph.2 Clearwell

Shop

New Paving Decommissioned Facility Blowers & Chemicals New Filters Ozone & Recarb SCU SCU SCU

Rehab/Replace : 2021-2024 Expand: 2038-2041

Rehab/Upgrade/Expand Existing

• Limited

Rehab for 18 MGD

• Acquire New

WTP Site

• Build Phase 1

and 2 of New WTP, 12 MGD each

• Phase out

Existing WTP after Ph1 WTP is built

• 50+ Year Life

New WTP Phase 1, 12 MGD (2031-2034) New WTP Phase 2, 12 MGD (2041-2044)

critical need WTP location unknown

Rehab/Upgrade/Expand Existing

• Limited

Rehab for 18 MGD.

• Acquire New

WTP Site

• Build New

WTP, 24 MGD

• Abandon

Existing WTP

• 50+ Year Life

New WTP 24 MGD (2031-2034)

critical need WTP location unknown

Rehab/Upgrade/Expand Existing

• No existing

WTP rehab

• Acquire New

WTP Site

• Build New

WTP, 24 MGD

• Abandon

Existing WTP

• 50+ Year Life

New WTP 24 MGD (2021-2024)

WTP location unknown

WTP Scenarios* 50 Year Present Values higher points = better Scenario Description Present Value, 2020 Ease of Implementation Risk to System Finished Water Quality Maintenance Reliability Operability Total Benefit Points Value (Cost:Benefit Ratio, normalized) 1 Rehab/Upgrade/Expand Existing $170 M 1 2 1 1 1 3 9 $1.26 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.

Existing 36” WL

KAW LAKE

Stillwater WTP OSU WTP 6-7 mgd (short-term, emergencies)

 High risk to make repairs  Can’t take out of service

for maintenance

 Past repair approach, in-

line screens and chamfered bends lends to high risk investigations

Kaw PS

Coat/Repair Ex., Construct Parallel 36”

• Coat and Repair

Existing 36” Water Line

• Construct New

Parallel 36” Water Line

• Expand Kaw

pumping

• Acquire Easements

Abandon Ex., New 42” WL, McMurtry for Backup

• Construct New 42”

Water Line

• Abandon Existing

36” Water Line

• Expand Kaw

pumping

• Construct McMurtry

Backup/Return System

• Acquire Easements

Coat/Repair Ex., Parallel Segments, Terminal Res.

• Coat and Repair

Existing 36” Water Line

• Construct Parallel

Segments for High- Risk Areas

• Expand Kaw pumping
• Build Terminal

Reservoir Backup/Return System

• Acquire Easements

Coat/Repair Existing, Construct Parallel 36”

• Coat and

Repair Existing 36” Water Line

• Construct New

Parallel 36” Water Line

• Acquire

Easements

• Expand Kaw

pumping

Existing WL

KAW LAKE

Stillwater WTP New Parallel WL OSU WTP 6-7 mgd (short-term) Kaw PS Increase capacity

Abandon Existing, Construct New 42” WL, McMurty Backup

• Construct New

42” Water Line

• Abandon

Existing 36” Water Line

• Expand Kaw

pumping

• Construct

McMurtry Backup/ Return System

• Acquire

Easements

KAW LAKE Stillwater WTP OSU WTP 6-7 mgd (short-term) New 42” WL LAKE McMURTRY Backup System (315M gal., min. 15 Days) Kaw PS Increase capacity

Rehab/Upgrade/Expand Existing

• Coat and

Repair Existing 36” Water Line

• Construct

Parallel Segments for High-Risk Areas

• Expand Kaw

pumping

• Build Terminal

Reservoir Backup/Return System

• Acquire

Easements

KAW LAKE Stillwater WTP OSU WTP Term Res Backup System (167M gal., min. 8 Days) Existing WL Parallel High Risk Areas Terminal Reservoir 6-7 mgd (short-term) Kaw PS Increase capacity

Coat/Repair Ex., Construct Parallel 36”

• Coat and Repair

Existing 36” Water Line

• Construct New

Parallel 36” Water Line

• Expand Kaw

pumping

• Acquire Easements

Abandon Ex., New 42” WL, McMurtry for Backup

• Construct New 42”

Water Line

• Abandon Existing

36” Water Line

• Expand Kaw

pumping

• Construct McMurtry

Backup/Return System

• Acquire Easements

Coat/Repair Ex., Parallel Segments, Terminal Res.

• Coat and Repair

Existing 36” Water Line

• Construct Parallel

Segments for High- Risk Areas

• Expand Kaw pumping
• Build Terminal

Reservoir Backup/Return System

• Acquire Easements

Raw Water Supply System Scenarios* 50 Year Present Values higher points = better Scenario Description Present Value, 2020 Ease of Implementation / Risk Raw Water Quality Reliability Permitting/Rights Operability Total Benefit Points Value (Cost:Benefit Ratio, normalized) 1 Coat/Repair Ex., Construct Parallel 36” $140 M 3 3 3 3 3 15 $1.00 2 Abandon Ex., Construct New 42” WL, McMurty Backup $160 M 2 1 2 1 1 7 $2.42 3 Coat/Repair Ex., Parallel Segments, Terminal Res. Backup $110 M 1 2 1 2 2 8 $1.51 *These results are an indication of ranking and do not necessarily represent the degree of improvement from one option to another.

Microsoft Excel Worksheet

Gallons of Water

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 20,000,000 1985 1990 1995 2000 2005 2010 2015 2020 2025

Annual Max Day Annual Avg Day *OSU ended water purchases from Stillwater in Fall 2010.

2,000,000 4,000,000 6,000,000 8,000,000 10,000,000 1985 1990 1995 2000 2005 2010 2015 2020 2025

Avg Day, December - March *OSU ended water purchases from Stillwater in Fall 2010.

wetter period drier period

Gallons of Water

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 20,000,000 1985 1990 1995 2000 2005 2010 2015 2020 2025

Annual Max Day Annual Avg Day Precipitation Chart

 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