San Francisco Public Utilities Commission Sewer: Protecting public health Water: Delivering high quality Power: Generating clean and the environment water every day energy for vital City services 1
Our Mission To provide our customers with high-quality, efficient, and reliable water, power, and wastewater services in a manner that values environmental and community interests and sustains the resources entrusted to our care. 2
Our Hetch Hetchy Regional Water & Power System Provides high-quality water for 2.6 million people 197 million gallons per day Gravity-fed engineering marvel Generates clean energy for the City’s vital services 3
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Water System Improvement Program • 4.8 Billion Dollar Program • Multi-Year Capital Program to Upgrade SFPUC’s Regional and Local Water Systems • 83 Projects • San Francisco Groundwater Supply Project • Regional Groundwater Storage and Recovery Project 5
Westside Groundwater Basin 6
North-South Geologic Cross Section 7
2014 Sustainable Groundwater Management Act • Emphasis on Local Control • 20 Years to Obtain Sustainability Goals • SGMA Requirements: • Local Agencies form a Local Groundwater Sustainability Agencies (GSAs) • High and Medium-Priority Basins must adopt Groundwater Sustainability Plans (GSPs) 8
SFPUC Groundwater Projects SFPUC Groundwater Projects • San Francisco Groundwater SFGW Supply (SFGW) Project Project – Additional water supply – 4 MGD Pumping – Continuous GSR Project • Regional Groundwater Storage and Recovery (GSR) Project – Put/Take/Hold Sequence – Design Capacity is 7.2 MGD over a 7.5 year drought – Full SFPUC Storage Account of 60,500 acre-feet 9 Source: HydroFocus, Dec, 2007.
SF Groundwater Supply Project Overview Project includes installation of: • 6 drinking water wells • 5 miles of new pipelines • Pumping will start at 1 mgd and slowly ramp up by approximately 1 mgd/yr • Groundwater will be blended with SFPUC regional water supplies at 2 reservoirs • Blended water will be distributed throughout the City 10
Well Station Overview 11
SFGW Well Treatment 12
Adaptive Management Approach to Project Operations ● Pumping will start at 1 mgd and ramp up by approximately 1 mgd per year ● We will closely monitor how Lake Merced and the groundwater basin respond ● Pumping rates will be adjusted, as needed, to maintain: Health of Lake Merced Appropriate groundwater levels Groundwater quality in coastal monitoring wells 13
SFGW Ongoing Public Outreach Since 2007 Community Outreach • Direct interactions at various venues with over 700 Participants • Sampling of Groundwater Blend Media Coverage (print/TV/radio stories) Currents/Digital Currents (utility bill inserts/newsletter) Planning Dept. mailings (EIR) Fact Sheets 14
Regional Groundwater Storage and Recovery Project • Conjunctive Use Project • Partner Agencies: • City of Daly City (6 wells) • California Water Service (6 wells) • City of San Bruno (4 wells) • 7.2 MGD dry year supply over 7.5 years • 60,500 acre feet water savings account – similar in volume to Crystal Springs Reservoir 15
Project Vicinity Map 16
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GSR Operating Agreement • In-Lieu Water Delivery in Wet and Normal Years • Water Bill credits for In-Lieu Water Delivered • GSR Project Pumping in Drought Years • Emergency Use • GSR Storage Account – accounting for basin losses 18
Groundwater Level Responses Existi ting Irrigation Proposed GSR R Well Well 1 2 3 4 5 Pre-Pi Pilot ot Progr ogram m Water er Level el 6 7.5 1. Initi tial 2. Put/ t/Ho Hold Years rs 3. Take ke Years rs, First st 4. Take ke Years rs, 5. Stora rage after ter Conditi tions, No Three Years rs of Drought t Longer r than Drought t (Put/ t/Ho Hold Project Drought Three Years rs Years) rs) 19
In-Lieu Recharge Works in the South Westside Basin 20
GSR Wells Connecting to SFPUC Regional Water System Pipeline No. of Wells Connecting SAPL2 5 SAPL3 1 CSPL2 2 SSPL 1 TOTAL 9 21
Irrigation Well Locations 22
Wells Pumping in Close Vicinity Can Affect Groundwater Levels Cone of depres ression ion for r just irrigat igation ion we well pumpi mping ng Lower r combined ined cone e of depres ression sion for r both irrigation igation we well and propos oposed ed GSR well pumping ing 23
GSR Project Sites in Daly City Colma BART Site Lake Merced Golf Club Site Serra Bowl Site Park Plaza Site Ben Franklin Intermediate School Site 24
GSR Project Sites in Daly City: Benjamin Franklin Intermediate School Site Construction Limits Benjamin Franklin Intermediate School Well Station 25
GSR Project Sites in Colma: Serramonte Boulevard Well Station 26
Ben Franklin Site in Daly City 27
Linear Park Site in South San Francisco 28
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Simplified Overall GRS Well Station System Configuration 30
Typical Individual Well Station Configuration 31
GSR Well Treatment Summary 32
Blending Operations Strategy Approved by SWRCB • In-line volumetric blending • Flow meters in transmission pipelines will verify minimum surface water flow is maintained • If minimum flow is not achieved, well will automatically be shut down • Periodic WQ sampling will confirm blending meets MCLs 33
Chrome 6 Blending Treatment in the Regional Transmission Pipelines 34
GSR Operational Monitoring 35
Example at CCP with Variable SAPL2 Flow Rates CP Chrome-6 GW Chrome-6 SFRWS Chrome-6 GW Flow Rate SAPL2 Flow Rate 30 30 25 25 Chrome-6 Concentration (ug/L) 20 20 Flow Rate (MGD) 15 15 Chrome-6 MCL Flow Auto Shutdown 10 10 Chrome-6 Auto Shutdown Flow Alarm Chrome-6 Alarm 5 5 0 0 0:00 2:00 4:00 6:00 8:00 10:00 12:00 14:00 16:00 18:00 20:00 22:00 0:00 Hours
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