Update on California WaterFix

Transcription

1 Update on California WaterFix ACWD Board Meeting August 11, 2016 Month, Day, Year

2 California WaterFix Draft Schedule Biological Assessment and Opinion Draft BA Final BA BA Consultation 9/30/15 1/8/16 Apr 22, 2016 Sept 5, 2016 EIR/S and ROD/NOD Comments, Response, Admin. Draft Final EIR/EIS 2/26/16 5/23/16 ROD/NOD Jun 20, 2016 Sept 16, 2016 SWRCB Permit Petition Notice of Petition & Hearing Draft Order & Public Comments 2/26/16 5/25/16 5/25/16 Adoption? 1/25/17 USACE 404 Permit Sept 15, 2016 Jul Oct Jan Apr Jul Oct Jan

3 In Review, ACWD assumptions for WaterFix are: Increased water supply availability of 6.6 TAF/yr compared to the worst case scenario, Existing Conditions, High Outflow (ECHO) Cost ACWD $106,000,000 ACWD is preparing a Business Case for WaterFix What's it worth? What do we need? 3

4 Alternatives Under Consideration Baseline (48 mgd, build-out demand) Project (48 mgd) No-action Build out (48 mgd demand) Near term (43 mgd (provides What if? ) ) Indirect Potable Reuse (48 mgd) (tonight) Bay Desalination (48 mgd) Los Vaqueros Expansion New addition Sites Reservoir New addition Lake Del Valle Storage Expansion 4

5 August Update Local Bay Desalination Concept Option A2b from 2014 Water Supply Alternatives Study Study found Bay Desal was very costly compared to Regional Desal A2b (Local Bay Desal) Regional Desal Total Unit Cost ($/AF) $4,700 $1,500 5

6 Regional Desal many cost efficiencies Regional Desal Plant Best of 13 alternative sites 20 mgd economy of scale Existing Intake and Water Rights Brine Discharge at adjacent WWTP Close to PG&E Low salinity which is seasonally variable : ~1,000 ppm Winter / Spring. 12,000 ppm Summer / Fall. Reference: to 25,000-35,000 ppm Bay Water 6

7 2014 Water Supply Alternative Study Bay Desalination Option A2b Approx. plant location Brine Line to USD Located in Warm Springs to directly replace some TP2 production Brine discharge via EBDA outfall; limited to dry months only 22mgd facility, 50% recovery, 11mgd permeate Would produce 8,000 AF/yr. over 8 months Intakes would be shallow slant wells beneath the Bay 9 wells, 2.5mgd each 7

8 Discharge Constraint = Cost Sensitivity Dry season only increases Plant Size and # of wells by 50%. Brine to EBDA Outfall Brine Line adds cost ACWD Distribution System Slant Wells in Land near Bay Local Desalination Plant 8

9 Unit Cost Comparison: ACWD Bay Desal and Regional Desal A2b (Local Bay Desal) Regional Desal Slant Wells* Brine Discharge* +40% $105 M $88 M Total Capital Cost $273 M Other Capital Costs $271 M Total Capital Cost $464 M Unit Cost A2b (Local Bay Desal) Regional Desal Unit Cap. Cost ($/AF) $3,300 $800 Unit O&M Cost ($/AF) $1,400 $700 Total Unit Cost ($/AF) $4,700 $1,500 *Includes estimates for overhead, implementation, contingency, and environmental mitigation 9

10 California WaterFix Alternatives Analysis: Bay Desalination 10

11 WaterFix Alternatives Analysis : Bay Desal 2040 Build-Out demands Opt-Out therefore ECHO SWP reliability 11 mgd Bay Desalination Facility run for 8 months a year 8,000 AF/yr. 11

12 Bay Desal as Alternative to WaterFix Capital Cost 2016$ 11 MGD Permeate Desal Facility $464 M Newark Desalination Facility improvements Upper Zone enhancements (offset TP1 function under future, higher demands) $5 M $10 M (likely low) Total Capital Costs $ 479 M 12

13 Bay Desal Modelling Results Improved Reliability Modelled 8TAF Desal for only a 6.6 TAF loss of SWP supply loss Desal is drought proof No change in SFPUC use Groundwater conditions very health Proper usage of Semitropic Storage Investment 13

14 Results: Cost Scenario Assumes Net Capital Costs Amortized Capital Cost Long Term Avg Annual Water Supply and Production Costs Total UWMP Worst Case Status Quo Delta condition $0 $0 $ 41.5 M $41.5 M ECHO $0 $0 $ 42.2 M $42.2 M WaterFix IPR Desal Project Alt 4 (the tunnels) + TP1 upgrade ECHO + IPR + Desal Imps + Upper Zone costs ECHO + Bay Desal + Desal Imps + Upper Zone costs $134 M $ 7.7 M $ 36.1 M $43.8 M $85 M $4.9M $44.8 M $49.6 M $479 M $27.6M $ 50.6 M $78.2 M All costs are in 2016 dollars 14

15 Results: Other Factors Description Water Quality Local Control Resiliency Shortage s % Annual Cost UWMP Worst Case Water Fix IPR Status Quo Delta o o o condition ECHO + o (Local dry conditions) Project Alt 4(the tunnels) + TP1 upgrade + o + ECHO + IPR + Desal Imps + Upper Zone costs + + o 5% (1 in 20 years) $41.5 M 14% (3 in 20 years) $42.2 M 5% (1 in 20 years) $43.8 M Effectively no shortages $49.6 M Bay Desal ECHO + Bay Desal Desal Imps + Upper Zone costs Legend: oneutral +Positive Negative 7% (1 in 80 years) $78.2 M 15

16 Bay Desal Cost Sensitivities Uncertainties that could lower costs Discharge to Salt Ponds Relaxed discharge in winter months / smaller plant Uncertainties that could increase costs Slant wells yields low due to Bay muds Further restrictions on Brine Discharge 16

17 Alternatives Under Consideration Baseline (48 mgd, build-out demand) Project (48 mgd) No-action Build out (48 mgd demand) Near term (43 mgd (provides What if? ) ) Indirect Potable Reuse (48 mgd) (tonight) Bay Desalination (48 mgd) Los Vaqueros Expansion New addition Sites Reservoir New addition Lake Del Valle Storage Expansion 17

18 Questions? 18

19 Facilities Quantity Total Cost Notes Desalination Plant and On-site Pipelines Brine Concentrate Pipeline to EBDA Outfall at WWTP 22 mgd $119,017,305 73, 000 ft. $36,500,000 Brine Concentrate Pump Station 2,193 hp. $2,597,038 Product water clear-well 1 MG $2,000,000 Based on BARDP, excludes intake, clear-well & transmission for product water storage; assumes 50% recovery rate Assumes desalinization facility at Irvington Pump Station Product water distribution pump station Product water pipeline into distribution system Slant wells for intake of bay water 133 hp. $ 543,395 1,000 ft. $ 500,000 Assumes 40 psi needed to enter pressurized distribution system; should be confirmed 9 $ 47,880, MGD per well Easement & Land Acquisition $ 4,224,059 19