Overview Our local water resources (Vai)

Transcription

1 Overview Our local water resources (Vai) Water conservation (Ron) Integrated water plan and Desalination (Melanie) October 18, 2012 Santa Cruz County Water Santa Cruz County Watersheds Source: 80% groundwater 20% surface water Total: about 86,000 acre feet per year Mostly agricultural (about 60%) Residential use accounts for ~ 25% 86,000 1

2 Santa Cruz County 31 inches of rain per year for Soquel Aptos 16.5 is runoff 11.5 evaporates 2.5 into groundwater 15%.5 surface water to be used 2

3 Monterey Area Western Purisima : Fall

4 Water Shortages Goal How to Conserve 35% for 20 Years Show methods and estimated costs What did we come up with? Two conceptual mandatory water restriction scenarios: Convey customer & District impacts Estimate reliability Scenario A: The Enforcement Approach Scenario B: The Full Tool Box Approach 4

5 Key Components of Both Scenarios Comparison of Water Restriction Scenarios * Blue circles are unique to Scenario B Scenario A: Enforcement Approach Scenario B: Full Toolbox Approach Enforcement Other Moratorium Monthly Billing Education Enhanced Rebates Pricing Water Budgets Behavior Modification Direct Install District Cost: $40 Million (M) Customer Cost: ~$77 M Total Cost: $117 M* *Customers directly purchase and install water conserving measures for ~$77M. District provides $40M, customers pay over time via rates. Customer driven Low chance of success District Cost: $117 Million (M) Customer Cost: $0 M Total Cost: $117 M # # The District purchases and installs water conserving measures, customers pay over time via rates for $117M. District driven Moderate chance of success Conclusions Average Cost per AF of Water (Total Annual Expenses / AF of Water Sales) Water restrictions alone carry a huge risk Uncharted territory Potential failure and consequence of seawater intrusion Other factors to consider: Climate change 30% less recharge Water quality regulations *Both scenarios are conceptual and unproven and carry risk that seawater intrusion may occur even if attempted Note: Desal assumes substantially higher water sales. Bills would vary based on water use and rate structure. 5

6 Water Industry Help Wanted Aging Workforce next 10 years 50% retire Less available people the rising Generation X (30 50 yrs) is 25% smaller than current workforce Growing industry growing and changing as technology advances, new water sources are developed, wastewater treatment technologies evolve, and regulations increase Water Footprint Sister to Carbon Footprint 654,000 gals avg. US citizen Footprint Only 5% (37,000 gals) from direct use 1 hamburger = 600 gallons 1 cotton T shirt = 500 gallons 1 slice of bread = 10 gallons 1 beer = 20 gallons (can t use that as excuse anymore to save water) Toilets Technology Evolution Pre gallons per flush gallons per flush ish 1.6 gpf gpf (2010 invent 0.8 gpf, future no water?) 6

7 Hot water Recirculation Systems Who likes to waste water? Peanut Butter & Jelly Energy produces water, water makes E In CA 20% of energy use related to water Who steps into a cold shower? 100 watt light blub for 10 hrs takes 25 gals Nifty device saves water (best type is the self activate type systems save energy too) 3 Rounds Who wins? Safety a draw (EPA vs. FDA) Environmental tap takes it (bottle 1/4 oil) Co$t bottle 1000 times more costly KNOCKOUT tap wins Best Life/Work Lesson It s not the strongest of the species that survives, nor the most intelligent, but the one most responsive to change. Charles Darwin 7

8 scwd 2 is a collaboration between the Santa Cruz Water Dept. & Soquel Creek Water Dist. Melanie Mow Schumacher Education Bachelor of Science, Civil Engineering Licensed, California Professional Engineer (P.E.) Jobs Construction Management Military Base Conversions Geotechnical Engineering Soil Samples and Testing Water Resources Soquel Creek Water District Santa Cruz Soquel Together we serve over 135,000 people Similar values and objectives Our different needs led us to a collaborative approach for sustainable water resources Our Primary Goals Regarding Water Supply: Safe Adequate Reliable Water Supply Issues Our Water Plan: A multi faceted approach 1. Groundwater Basin not sustainable 2. Seawater Intrusion 3. Water Quality 4. Climate Change 1. Drought 2. More Water for Fish 3. Water Quality 4. Climate Change This Water Plan is a culmination of over 30 years of evaluation and looking at numerous supply alternatives. 8

9 Soquel Creek Water District Residents use about 40% less (residential, gallons per person per day) Conceptual 2.5 MGD Desalination Facility Potential Facility: Located within the Industrial Area of SC 111 Water Use Comparison ~70 Intake example California (Average, 2005) Santa Cruz (2010) * Shared Use *Shared Costs Cost Estimate and Timeline Frequently Asked Questions ~ $115 million $65M for City $50 M for District *Desalination would increase water bill by ~$5/month Pilot Plant Testing Additional Studies EIR and Project Approval Design, Permitting, Construction What about the environmental issues with the intake and the brine? Does desalination use a lot of energy and how are greenhouse gases being addressed? What about Measure P in the City? What about alternatives? Are there successful desalination plants currently in operation? (Schedule subject to change) 9

10 How to stay informed about the project Handouts are available at back table E mail Updates sign up to receive monthly notices and project updates For more info contact: Desalination Program Coordinator at (831) 420 Visit our website: Questions? p g What studies have been conducted? substantiates that desalination is What are the preliminary results? plausible Concern Water Quality Marine Impacts with Intake Marine Impacts with Brine Discharge Energy and GHGs Study Pilot Plant Testing Open Ocean Effects (Entrainment and screen effectiveness) Brine Dilution Study Energy Minimization & GHG Reduction Plan Study Findings Desal water is safe No endangered or threatened species found, entrainment impacts considered de minimus Can effectively blend treated wastewater and brine. Currently underway Technical studies will be used to fully inform the environmental impact report (EIR). Energy to operate desal plant is less than 20% of energy used for TVs in our service areas Will the proposed desalination project use a lot of energy? Household Energy Equivalents for Desalination 8 to 24 hours per day 1 to 3 loads per week 1 to 3 hours per day On a household basis, the additional energy for desal is equivalent to leaving a computer on for 1-3 hours a day. A white paper on Energy Use related to Desalination is now available. 10

11 How are the agencies addressing greenhouse gas emissions? An Energy Minimization and GHG Reduction Plan is underway with a Technical Working Group to evaluate ways to reduce the carbon footprint, including net-carbon neutral. Desalination uses electricity so it indirectly causes GHG emissions in the same manner as homes and businesses The addtional indirect GHGs to operate the desal plant is equivalent to approx typical automobiles. What about the surface water transfer project? but project does not meet either agency s near term needs. Estimated ~340 afy available to SqCWD. This is less than 25% of the supplemental supply needed. SCWD is not guaranteed any water back from SqCWD or SV because both groundwater basins are overdrafted... not considered an alternative to developing a new reliable and flexible supplemental supply. John Ricker, Water Resource Division Director Santa Cruz County Environmental Health Services designed to protect marine organisms the Heidi1 potential open ocean intake system Potential intake system under evaluation: Slot size of 2 mm Intake velocity < 0.33 fps Courtesy of: Alden Research Monterey County commercial and Screened recreational open ocean fishing: intake: ~ 160,000 white equivalent of croaker per year ~ 50 white croaker per year Pacific Fisheries Information Network and Tenera 11

12 Slide 44 Heidi1 I would like to delete this slide. I've heard from several that it looks like we are comparing to commercial fisheries (peoples livelihood) and saying see, we're not as bad as that and also that 50 is still large. Can we delete it? And maybe conclude the intake study with some bullets about what its doing: assessing habitat including special status species. evaluating ways to eliminate impingement and reduce entrainment. Assess impacts and mitigate them. hluckenbach, 5/5/2011

13 How much will the proposed project cost? Conceptual Project Costs Several components continue to be evaluated Costs will be shared equitably between the City and District Conceptual cost estimated at ~$115 million (includes 30% contingency) Intake Structure Land Acquisition Treatment Plant Desalination is a proven and successful technology 1950s First major desalination plants built in the Middle East Sand City s RO units 1961 First U.S. seawater desalination plant built in Freeport, Texas Currently over 15,000 desalination plants in operation worldwide Alternative Energy Concentrate Disposal Storage & Delivery 70% of U.S. desalination capacity uses reverse osmosis technology Evaluating ways to bring ocean water to facility and limit impacts would cover a surface area on the ocean floor equivalent to 4.5 football fields. Open ocean intake Subsurface intake scwd 2 is evaluating two intake approaches in terms of engineering feasibility, cost, and affects to marine life/ocean floor Working with regulatory agencies and scientific community through Technical Working Groups Intake impacts will be evaluated in the EIR Process 12

14 Brine discharge can be safely handled: Mix brine with existing wastewater effluent Conceptual design will mix brine from proposed project with the existing wastewater effluent Brine Dilution Study ensures that brine can be effectively mixed with effluent so as to have no altering effect on the Bay. Utilize existing infrastructure 13