HomeMy WebLinkAboutSatff Report 2404-29684.City of Palo Alto One Water Plan: Presentation of Initial Results (DISCUSSION 7:35 PM –
8:30 PM) Staff: Lisa Bilir
Item No. 4. Page 1 of 1
Utilities Advisory Commission
Staff Report
From: Dean Batchelor, Director Utilities
Lead Department: Utilities
Meeting Date: June 3, 2024
Staff Report: 2404-2968
TITLE
City of Palo Alto One Water Plan: Presentation of Initial Results
RECOMMENDATION
This item is for discussion and no action is requested. Staff seeks input from the Utilities Advisory
Commission (UAC) on its initial results from the City of Palo Alto One Water Plan.
The attached presentation describes the One Water Plan background, goals, approach, overview
and initial results. Staff also plans to return to the UAC with a complete One Water Plan in Fall
2024 before finalizing the One Water Plan for Council acceptance by the end of 2024. A
conceptual list of water supply options (projects) was provided to the UAC in February 2023 and
is available as an attachment to Staff Report 14974.1 Attachment A provides a table of initial draft
planning-level unit cost estimates for water supply projects; note that before Council approves
any water supply project, additional studies would be necessary to explore information such as
feasibility, engineering design and cost.
ATTACHMENTS
Attachment A: Unit Costs for Water Supply Options (Projects)
Attachment B: Presentation
AUTHOR/TITLE:
Dean Batchelor, Director of Utilities
Staff: Lisa Bilir, Senior Resource Planner
1 Staff Report 14974 https://www.cityofpaloalto.org/files/assets/public/v/1/agendas-minutes-reports/agendas-
minutes/utilities-advisory-commission/archived-agenda-and-minutes/agendas-and-minutes-2023/02-feb-2023/02-
01-2023-id-14974-item-2.pdf
Attachment A – Initial Draft Planning Level Unit Cost Estimates of Water Supply Projects
1 | P a g e
Note: Projects identified with “*” in the tables were included as water supply and conservation options and proceeded through the project screening
Current Cost Basis 2023
Imported Desalination Units
SFPUC*
Enhanced
Conservation,
Phase 1*
Enhanced
Conservation,
Phase 2*
Irrigation Wells
Emergency Well
Conversion Full
Treatment*
Emergency Well
Conversion (El
Camino Only),
Full Treatment
Emergency Well
Conversion
Blending
Emergency Well
Conversion (El
Camino Only)
Blending
DPR, Palo Alto
Facility*
DPR, Regional
Facility*
DPR, Palo Alto
Facility with
SSRF*
IPR,
Groundwater
Injection*
Non Potable
Reuse
Bay Water
Desalination*
Multi Source
Storage
Green
Infrastructure Graywater Rain Barrels
Total Capital Cost
Capital Cost $0 $0 $0 $1,000,000 $49,760,760 $25,472,442 $1,532,363 $0 $105,257,000 $16,410,000 $48,900,000 $188,900,000 $148,510,000 $251,832,599 $22,630,000 $4,080,000 $0 $0 $
Land Acquisition Cost $0 $0 $0 $0 $0 $0 $0 $0 $11,463,000 $0 $7,400,000 $7,400,000 $0 $43,560,000 $0 $0 $0 $0 $
Amortized Capital and Land Cost $0 $0 $0 $65,051 $3,408,068 $1,788,376 $92,395 $0 $7,592,804 $1,067,494 $3,662,396 $12,769,597 $9,660,789 $19,215,712 $1,472,114 $265,410 $0 $0 $
Total Annual O&M Cost
Groundwater Production Charge N/A N/A N/A $93,096 $5,172,000 $4,137,600 $5,172,000 $4,137,600 $0 $0 $0 $5,671,960 $0 $0 $0 $0 $0 $0 $ per Year
O&M Cost $24,267,125 $188,176 $639,142 $6,822 $1,811,749 $1,362,069 $212,010 $169,608 $9,305,267 $6,049,640 $1,897,644 $6,213,260 $992,271 $9,827,073 $60,000 $240,000 $46,650 $43,251 $ per Year
Energy Cost $0 N/A N/A $3,276 $99,964 $74,426 $99,964 $74,426 $74,733 $270,999 $45,045 $1,054,780 $82,592 $1,281,486 $0 $0 $0 $0 $ per Year
Total Unit Cost
Total Annual Cost $24,267,125 $188,176 $639,142 $168,246 $10,491,781 $7,362,471 $5,576,369 $4,381,634 $16,972,804 $7,117,134 $5,605,085 $25,709,597 $10,653,060 $30,324,272 $1,532,114 $505,410 $46,650 $43,251 $ per Yr
Project Yield 10,982 606 330 54 2,250 1,800 3,000 2,400 4,723 1,769 630 5,150 1,100 4,480 39 30 6 0.7
Acre Feet
per Year
Capital Cost Unit Cost $0 $0 $0 $1,205 $1,515 $994 $31 $0 $1,608 $603 $5,813 $2,480 $8,783 $4,289 $38,125 $8,847 $0 $0 $ per AF
GPC Unit Cost $0 $0 $0 $1,724 $2,299 $2,299 $1,724 $1,724 $0 $0 $0 $1,101 $0 $0 $0 $0 $0 $0 $ per AF
O&M Unit Cost $2,210 $310 $1,939 $126 $805 $757 $71 $71 $1,970 $3,420 $3,012 $1,206 $902 $2,193 $1,554 $8,000 $8,215 $58,321 $ per AF
Energy Unit Cost $0 $0 $0 $61 $44 $41 $33 $31 $16 $153 $71 $205 $75 $286 $0 $0 $0 $0 $ per AF
Total Unit Cost $2,210 $310 $1,939 $3,116 $4,663 $4,090 $1,859 $1,826 $3,594 $4,024 $8,897 $4,992 $9,685 $6,768 $39,679 $16,847 $8,215 $58,321 $ per AF
Future Cost Basis 2045
Imported Desalination Units
SFPUC*
Enhanced
Conservation,
Phase 1*
Enhanced
Conservation,
Phase 2*
Irrigation Wells
Emergency Well
Conversion Full
Treatment*
Emergency Well
Conversion (El
Camino Only),
Full Treatment
Emergency Well
Conversion
Blending
Emergency Well
Conversion (El
Camino Only)
Blending
DPR, Palo Alto
Facility*
DPR, Regional
Facility*
DPR, Palo Alto
Facility with
SSRF*
IPR,
Groundwater
Injection*
Non Potable
Reuse
Bay Water
Desalination*
Multi Source
Storage
Green
Infrastructure Graywater Rain Barrels
Total Capital Cost
Capital Cost $0 $0 $0 $1,071,225 $53,304,971 $27,286,717 $1,641,505 $0 $159,050,554 $29,450,626 $73,891,257 $240,333,553 $188,946,193 $380,536,347 $25,968,446 $4,681,894 $0 $0 $
Land Acquisition Cost $0 $0 $0 $0 $0 $0 $0 $0 $17,321,380 $0 $11,181,908 $9,414,867 $0 $65,822,151 $0 $0 $0 $0 $
Amortized Capital and Land Cost $0 $0 $0 $69,685 $3,650,808 $1,915,753 $98,976 $0 $11,473,247 $1,915,805 $5,534,131 $16,246,493 $12,291,221 $29,036,261 $1,689,285 $1,689,285 $0 $0 $
Total O&M Cost
Groundwater Production Charge $0 $0 $0 $346,726 $19,262,570 $19,262,570 $19,262,570 $15,410,056 $0 $0 $0 $21,124,618 $0 $0 $0 $0 $0 $0 $ per Year
O&M Cost $49,517,551 $418,502 $1,421,444 $15,173 $4,029,311 $3,029,227 $471,508 $377,206 $20,694,811 $13,454,332 $4,220,340 $13,818,221 $2,206,800 $21,855,303 $133,439 $533,757 $103,749 $96,190 $ per Year
Energy Cost $0 $0 $0 $4,826 $159,607 $118,832 $159,607 $118,832 $119,323 $432,691 $71,921 $1,684,115 $131,871 $2,046,084 $0 $0 $0 $0 $ per Year
Total Unit Cost
Total Annual Cost $0 $418,502 $1,421,444 $436,410 $27,102,295 $24,326,381 $19,992,661 $15,906,094 $32,287,381 $15,370,137 $9,826,392 $52,873,447 $14,629,892 $52,937,648 $1,822,724 $2,223,042 $103,749 $96,190 $ per Yr
Project Yield 12,113 606 330 54 2,250 1,800 3,000 2,400 4,723 1,769 630 5,150 1,100 4,480 39 30 6 1
Acre Feet
per Year
Capital Cost Unit Cost $0 $0 $0 $1,290 $1,623 $1,064 $33 $0 $2,429 $1,083 $8,784 $3,155 $11,174 $6,481 $43,749 $56,309 $0 $0 $ per AF
GPC Unit Cost $0 $0 $0 $6,421 $8,561 $10,701 $6,421 $6,421 $0 $0 $0 $4,102 $0 $0 $0 $0 $0 $0 $ per AF
O&M Unit Cost $4,088 $690 $4,313 $281 $1,791 $1,683 $157 $157 $4,382 $7,606 $6,699 $2,683 $2,006 $4,878 $3,456 $17,792 $18,271 $129,705 $ per AF
Energy Unit Cost $0 $0 $0 $89 $71 $66 $53 $50 $25 $245 $114 $327 $120 $457 $0 $0 $0 $0 $ per AF
Unit Cost $4,088 $690 $4,313 $8,082 $12,045 $13,515 $6,664 $6,628 $6,836 $8,689 $15,597 $10,267 $13,300 $11,815 $47,205 $74,101 $18,271 $129,705 $ per AF
Other
Conservation
Conservation
Water Reuse Other
Water ReuseGroundwater
Groundwater
June 3, 2024 www.cityofpaloalto.org
One Water Plan:
Initial Results
Utilities Advisory Commission
2 www.cityofpaloalto.org
One Water Initial Results Outline
1.Goal, Overview & Approach
2.Supply and Conservation Projects
3.Water Supply & Conservation Portfolios
4. Initial Conclusions
5. Next Steps
3 www.cityofpaloalto.org
Previous UAC Meetings on One Water Plan
•July 7, 2021 – One Water Plan Draft Scope
•February 1, 2023 – One Water Plan Update;
provided update on screening process,
stakeholder engagement and portfolio
approach
4 www.cityofpaloalto.org
One Water Plan: Goal
Council adoption of a One
Water supply plan that is a
20-year adaptable roadmap
for implementing prioritized
portfolio alternatives for
water supply and
conservation
5 www.cityofpaloalto.org
One Water Plan: Approach
•Key Action in City’s Sustainability and Climate Action Plan (SCAP)
•Long-term 20-year (through 2045) Water Supply Plan
•Addresses future uncertainties
•Includes robust and meaningful stakeholder engagement
•In collaboration with Carollo Engineers, a national One Water thought leader
•Builds on existing plans/work
One Water Plan does not directly address:
•Near-term drought
•Short-term emergencies such as earthquakes and wildfires – addressed under separate
emergency plans
•Building codes
6 www.cityofpaloalto.org
Key Uncertainties
•Valley Water Transfer
•About half of effluent from Regional Water Quality Control Plant
•Option expires in 2033
•Transfer incompatible with some Palo Alto water supply options
•Future Water Supply Availability (varies by water supply project)
•Droughts
•Climate Change
•State regulations
•SFPUC’s alternative water supply implementation
•Cost
TITLE 40 FONT BOLD
Subtitle 32 font
7 www.cityofpaloalto.org
One Water Plan: Overview
(Summer 2024)
(End of 2024)
8 www.cityofpaloalto.org
Water Supply and Conservation Project
Screening
§Environmental
Benefits
§Ease of
Implementation
§Cost
§Reliability
9 www.cityofpaloalto.org
Screening Results:
Top Water Supply Projects
Baseline - SFPUC (Regional Water System; Current Potable Water Supply)
Conservation Phase 1
Conservation Phase 2
Groundwater Full Treatment (Iron, Manganese, Total Dissolved Solids)
Groundwater Blending
Direct Potable Reuse - Palo Alto Facility
Direct Potable Reuse - Regional Facility
Direct Potable Reuse - Palo Alto Facility with Small Salt Removal Facility
Indirect Potable Reuse
Bay Water Desalination
Note: full list of water supply and conservation options attached to this presentation, and schematics
on upcoming slides
10 www.cityofpaloalto.org
Enhanced Conservation Phase 1 & 2
Possible Measures
Conservation Phase 1 Conservation Phase 2
Outdoor irrigation assistance for commercial customers High Efficiency Toilet direct install for commercial
customers
Non- functional turf ban for commercial customers Turf conversion support for residential customers
Front lawn limitation for residential new developments
and major retrofits
Front lawn limitation for residential properties upon resale
Permanent 3-day watering week restriction
Low-income residential High Efficiency Toilet direct install
11 www.cityofpaloalto.org
Groundwater Options
Groundwater Blending Only (no treatment) –
not carried forward in One Water Plan, need to understand public acceptance
Groundwater with blending plus Iron (Fe), Manganese (Mn) and Total Dissolved Solids (TDS) treatment
SFPUC Water
12 www.cityofpaloalto.org
Direct Potable Reuse (DPR)
DPR Treatment Facility with three possible
configurations:
1) Palo Alto DPR Facility
Or
2) Regional DPR Facility owned by Valley
Water, if effluent transfer occurs
Or
3) Palo Alto DPR Facility that utilizes the
Small Salt Removal Facility currently being
built at the Regional Water Quality Control
Plant
13 www.cityofpaloalto.org
Indirect Potable Reuse (IPR)
14 www.cityofpaloalto.org
Baywater Desalination
15 www.cityofpaloalto.org
Project Normal Year Yield Comparison
(Acre Feet per Year)
16 www.cityofpaloalto.org
Project Unit Cost Per Acre Foot Comparison
17 www.cityofpaloalto.org
Project Compatibility With Valley Water
Effluent Transfer
No Valley Water
Transfer
With Valley Water
Transfer
Baseline - SFPUC (Regional Water System; Current Potable Water Supply)
Conservation Phase 1
Conservation Phase 2
Groundwater Full Treatment (Fe, Mn, TDS)
Groundwater Blending
Direct Potable Reuse - Palo Alto Facility No
Direct Potable Reuse - Regional Facility No
Direct Potable Reuse - Palo Alto Facility with SSRF
Indirect Potable Reuse – Palo Alto Facility No
Bay Water Desalination
Note: list of water supply and conservation options attached to this presentation
Water Supply and Conservation Tool & Portfolios
19 www.cityofpaloalto.org
Tool for Water Supply Portfolio Analysis
Future Scenario Assumptions
Project Variables
Portfolio Development
Project Costs Estimates
Portfolio Evaluation
Portfolio Supply
Summary
Portfolio Costs
Estimates
Portfolio Evaluation
Graphical Outputs
Water Demand Forecast
Project Yields
Project Cost Estimates
Project Evaluation
Data Inputs User Selections Outputs
20 www.cityofpaloalto.org
Water Supply Portfolio Evaluation Criteria &
Suggested Weights
Suggested weights from
stakeholder engagement
meeting with community
and interdepartmental
staff as well as online
survey
21 www.cityofpaloalto.org
Initial Water Portfolio Evaluation Results
Weighted Criteria Ranking by Portfolio - No Valley Water Transfer - 2045
Evaluation Criteria
Note:
1)Each portfolio includes
Conservation Phase 1 and
Phase 2, except Baseline SFPUC
2)Each portfolio includes SFPUC
supply
22 www.cityofpaloalto.org
Initial Water Portfolio Evaluation Results
Weighted Criteria Ranking by Portfolio - With Valley Water Transfer - 2045
Evaluation Criteria
Note:
1)Each portfolio includes
Conservation Phase 1 and
Phase 2, except Baseline
SFPUC
2)Each portfolio includes
SFPUC supply
23 www.cityofpaloalto.org
Initial Observations
•Conservation Phase 1 and Phase 2 score higher than “do nothing” and do not
require large investment to proceed (included in every portfolio other than the
SFPUC or “do nothing”)
•Highest Scoring Portfolios:
DPR - Palo Alto Only No Valley Water Transfer
DPR - Regional Facility with Valley Water Transfer
•Both DPR portfolios contingent on Valley Water Effluent Transfer; resolved in nine
years
•Baywater Desal is highest scoring portfolio not dependent on the Valley Water
Effluent Transfer
•Other high scoring portfolio is emergency supply well conversion with blending only
(no treatment); lower water quality so not included
24 www.cityofpaloalto.org
Sensitivity of Initial Results
Weighted Criteria Ranking by Portfolio - No Valley Water Transfer - 2045
Evaluation Criteria
Note:
1)Each portfolio includes
Conservation Phase 1 and
Phase 2, except Baseline SFPUC
2)Each portfolio includes SFPUC
supply
25 www.cityofpaloalto.org
Sensitivity of Initial Results
Weighted Criteria Ranking by Portfolio - With Valley Water Transfer - 2045 Evaluation Criteria
Note:
1)Each portfolio includes
Conservation Phase 1 and
Phase 2, except Baseline
SFPUC
2)Each portfolio includes
SFPUC supply
26 www.cityofpaloalto.org
Initial Results Sensitivity to Cost Weighting
•Top portfolios unchanged
DPR - Palo Alto Only No Valley Water Transfer
DPR - Regional Facility with Valley Water
Transfer
•Conservation scores higher
•Only the top scoring portfolio and Conservation
score higher than Baseline – SFPUC
•Groundwater blending only (no treatment) is
second-highest scoring infrastructure project and
scores higher than Baseline – SFPUC
27 www.cityofpaloalto.org
Next Steps
UAC Final One Water Plan (Fall 2024)
•Recommended supply strategy
•Trigger-based implementation plan
City Council Final One Water Plan (End of 2024)
Future Activities
•Funding Strategy
•Implementation
•Updating One Water Tool as conditions change