Water Program Update City of West Palm Beach
Water Program Update City of West Palm Beach Town of Palm Beach Water Committee Meeting April 26, 2010
Purpose of Today’s Meeting S Present Summary of All Program Activities S Present Conclusions of All Analyses S Present Staff Recommended Option S Request Commission Approval of Recommended Option 2
Recap Program Objectives Option 1 Option 2 • Keep Existing Water Plant • Supply from Surficial Aquifer • New Membrane Water Plant • Supply from Clear Lake Option 3 • New Membrane Water Plant • Supply from Surficial Aquifer • Floridan for Town Palm Beach Option 4 • New Membrane Water Plant • Supply from Surficial Aquifer/Floridan • Purchase Bulk Water What Supply Source? What Treatment Technology? Where to Locate? Rebuild or Renovate? Town of Palm Beach? 3
TPB 1 TM 2 TM 3 TM 4 TM 5 TM 6 TM 7 TM 8 C 2 C 3 C 4 C 5 C 6 C 7 C 8 T WATER SUPPLY EVALUATIONS TREATABILITY EVALUATIONS C C 14 9, 10, C 15 11, 12, C 16 13 W 1 W 2 W 3 W 4 W 5 W 6 T 1 T 2 T 3 T 4 T 5 T 6 T 7 T 8 W 7 W 8 T 9 T 10 T 11 TPB 3 TPB 4 1 7 2 D 13 D 14 D 15 D 16 D 17 D 18 TPB 5 TPB 6 s sk a T TM 23 TM 27 TM 30 TM 34 TM 38 TM 24 TM 28 TM 31 TM 35 TM 39 TM 25 TM 29 TM 32 TM 36 TM 40 TM 22 TM 37 TM 26 C 17 C 18 C 19 C 20 C 21 C 22 C 23 C 24 C 25 W 9 W 10 W 11 W 12 W 13 W 14 W 15 W 16, 17 18, 19 20 T 12 T 13 T 14 T 15 T 16 T 17 T 18 T 19 T 20 T 21 T 22 C 26 C 27 C 28 C 29 W W W 21, 22 27, 28 33, 34 23, 24 29, 30 35, 36 25, 26 31, 32 37 T 23 T 24 T 25 T 26 T 27 T 28 T 29 T 30 D 21 D 22 D 23 D 24 MA R 1 10 0 d te FEB 10 JAN 09 DEC 9 V 0 NO 9 o C D 19 e l p m T 0 OC 9 T 0 SEP 9 G 0 AU 09 JUL 09 D 10 D 11 JUN 9 MA Y 0 9 R 0 D 8 D 9 AP 9 R 0 MA D 6 D 7 TM TM 9 TM 12 TM 14 17, 18 TM 10 TM 13 TM 15 19, 20 TM 11 TM 16 21, 22 f o l a t o CONSENT ORDER COMPLIANCE D 5 TPB 2 TOWN OF PALM BEACH TIERS 1 & 2 IMPROVEMENTS 09 09 D 3 D 4 FEB D 1 D 2 DISTRIBUTION SYSTEM IMPROVEMENTS JAN 08 DEC 8 V 0 NO OC T 0 8 Timeline Summary D 25 D 26 D 27 TPB 8 TM TM TM 63 TM 66 TM 69 41, 42 47, 48 52, 53 58, 59 TM 64 TM 67 TM 70 43, 44 49, 50 54, 55 60, 61 TM 65 TM 68 45, 46 51 56, 57 62 C 30 C 31 C 32 C 33 W 38 W 39 W 40 W 41 W 42 W 43 W 44 T 31 T 32 T 33 T 34 C 35 C 36 C 37 C 38 W W W 45, 46 50, 51 56, 57 47, 48 52, 53 58, 59 49 54, 55 60, 61 T T 35, 36 40, 41 37, 38 42, 43 44 39 T 45 T 46 T 47 C 39 C 40 C 41 C 42 C 43 62, 63 64, 65 66, 67, 68, 69 W 70 W 71 T 48 T 49 T 50 T 51 T 52 4
Water Program Options Category Surface Water Options Groundwater Options Supply 1 B 50 mgd existing lakes IX-PAC-SED-UF-GAC 1 C 50 mgd existing lakes PAC-ES-O 3 -BAF 1 F 50 mgd existing lakes ES-SED-RGF 1 A 50 mgd existing lakes PAC-ES-SED-UF-GAC 1 E 40 mgd lakes; 10 mgd wells 1 D 50 mgd existing lakes 1 G 50 mgd existing lakes 2 A 50 mgd wells around lakes v E s 2 B 50 mgd wells around lakes IX-ES-SED-RGF 25 mgd lakes, 25 mgd wells Lakes: ES-SED-UF-GAC, Wells: ES-SED-RGF 25 mgd lakes, 25 mgd wells Lakes: IX-SED-UF-GAC, Wells: IX-ES-SED-RGF 3 C 30 mgd lakes, 20 mgd wells Lakes: Option 1 B, Wells: Option 2 A 3 D 20 mgd lakes, 30 mgd wells Lakes: Option 1 A, Wells: Option 2 A 3 E 10 mgd lakes, 40 mgd wells Lakes: Option 1 A, Wells: Option 2 A 3 F 40 mgd lakes, 10 mgd wells Lakes: Option 1 A, Wells: Option 2 A 3 G 40 mgd lakes, 10 mgd seawater Lakes: Option 1 A, Seawater: Desalination 4 A 30 mgd wells, 25 mgd Floridan Wells: Existing plant, Floridan: Reverse Osmosis 4 B 20 mgd wells, 37 mgd Floridan Wells: Existing plant, Floridan: Reverse Osmosis 4 C 40 mgd wells, 12. 5 mgd Floridan Wells: Existing plant, Floridan: Reverse Osmosis 4 D Same as 4 A, Floridan wells west Same as 4 A with Floridan Wells located out west 5 60 mgd wells around lakes Nanofiltration Membranes 5 A 60 mgd wells along Canal - west Same as 5 A located out west 3 A 3 B o l a Combination of Surface Water and Groundwater Options t To Surficial Aquifer & Floridan Aquifer Groundwater & Membranes Treatment O 2 2 f n o i pt Same as 1 B a u al d te PAC-ES-SED-GAC-UF PAC-EC-SED-O 3 -BAF-UV ES-SED-RGF (existing plant)
Water Supply Evaluations Water Supply Options S Town of Palm Beach Options S Groundwater S Shallow Surficial Aquifer S Deeper Floridan Aquifer Storage & Recovery Well S Surface Water 7
Water Supply Evaluations Town of Palm Beach Option Cost Desalination WTP $222 million Floridan Reverse Osmosis WTP $99 million Reclaimed Water from City TBD Membrane Bioreactor for Irrigation Water $50 - $110 million Remain “as-is” Customer $0 In December 2009, the Town decided to remain an “as-is” customer and pursue a conservation program. 8
Water Supply Evaluations Groundwater Evaluation Result Drilled Five Water quality excellent Exploratory Wells (low levels H 2 S) Constructed Test Well Typical Groundwater Well Drilling Exploratory Groundwater Well Pumping 1 -2 mgd (46 wells for 50 mgd) Aquifer Ample quantity available Performance Test Groundwater Model Updated & Calibrated Surficial Aquifer viable eastern area Floridan Aquifer viable western area No impact on regional system Environmental Assessments Wells sited to avoid contamination west side of the lakes & east of wtp, no wetland impacts Constructability Dewatering issues and flood elevation requirements necessitate above-ground wells 9
Water Supply Evaluations Surface Water Evaluation Result L-8 Reservoir CERP Project Coordination with SFWMD, modernizing control structures, all future demands satisfied Drought-Proofing Measures Raw water pump station intakes lowered, surface water management tool deployed, telemetry improvements Supply Augmentation ASR well, AWT facility on-line, stormwater capture from C-51, supplemental water from test well, Source Water Protection Physical barrier with new trees, vulnerabilities being addressed, meetings with property owners Source Water Protection Control Structure #4 10
Water Treatability Evaluations Experts Brainstorming Identification of Technologies for Testing Phase 1 Bench Testing Pre-Treatment Options for Taste & Odor & Initial Sizing Pilot Operations Membrane Performance, Process Treatment Combinations Phase 2 Bench Testing Post-Treatment Options for Taste & Odor Technical Evaluations Condition Assessments, Capital, Operating, & Life -Cycle Cost Estimates Recommended Option 11
Phase 1 Bench Testing Goals S Total Organic Carbon Removal Efficiency S Taste & Odor Removal Efficiency S Enhanced Taste & Odor Removal Efficiency 12
16 Raw Water Concentration 14 Total Organic Carbon (mg/L) Phase 1 Bench Testing Results Total Organic Carbon Removal 12 10 8 6 4 2 0 Powdered Ion Exchange Activated Carbon Ozone Chlorine Dioxide Enhanced Coagulation PAC, EC, Ozone IX, PAC, EC most effective TOC removal 14
160 2004 Raw Water 140 120 100 MIB (ng/L) Phase 1 Bench Testing Results Pre-Treatment MIB (2 -methylisoborneol) 80 60 40 20 0 Powdered Ion Exchange Activated Carbon Ozone Chlorine Dioxide Enhanced Coagulation PAC, EC Since 2004 Raw Water Levels Ranged from 9 -12 ng/L 10 ng/L is detection level PAC, EC, Ozone IX, PAC, EC most effective MIB removal 15
300 2004 Raw Water Level 250 200 Geosmin (ng/L) Phase 1 Bench Testing Results Pre-Treatment Geosmin 150 100 50 0 Powdered Ion Exchange Activated Carbon Ozone Chlorine Dioxide Enhanced Coagulation PAC, EC, Ozone IX, PAC, EC most effective Geosmin removal Since 2004 Raw Water Levels Ranged from 7 -10 ng/L 16
Phase 1 Bench Testing Results Pre-Treatment Conclusions Ion Exchange good TOC removal, improved PAC performance, substantial reduction in chemical demands Pilot Test Powdered Activated Carbon good MIB and Geosmin removal, Calgon WPH 1000 ® best for the City's surface water Pilot Test Enhanced Coagulation requires more chemical usage, sensitive to exact operating conditions Pilot Test Ozone high dose very effective but higher potential for DBP formation. Low dose not as effective as IX/PAC Do not Pilot Test Chlorine Dioxide not an effective pretreatment option Do not Pilot Test 17
Pilot Goals S Treatment Effectiveness S Color S Turbidity S Total Organic Carbon Removal S Operational Parameters S Flux S Cleaning Frequency 18
Raw Water Level 45 40 35 Color (Pt. Co) Results of Pilot Operations 50 Finished Water Color 30 25 20 Regulatory Limit 15 10 5 0 Existing Enhanced Softening Plant Enhanced Softening, Membranes Enhanced Coagulation, Membranes Ion Exchange, Membranes Sedimentation, Membranes most effective 21 color removal
0. 09 0. 08 0. 07 Turbidity (NTU) Results of Pilot Operations 0. 1 Finished Water Turbidity 0. 06 0. 05 0. 04 0. 03 0. 02 0. 01 0 Existing Enhanced Softening Plant Enhanced Softening, Membranes Regulatory limit is 0. 3 NTU Enhanced Coagulation, Membranes Ion Exchange, Sedimentation, Membranes 22
80% 70% Total Organic Carbon Percent Removal Results of Pilot Operations Finished Water Total Organic Carbon 60% 50% Regulatory Minimum 40% 30% 20% 10% 0% Existing Enhanced Softening Plant Enhanced Softening, Membranes Enhanced Coagulation, Membranes Ion Exchange, Sedimentation, Membranes 23 most effective TOC removal
Results of Pilot Operations Operational Flux Ranges Submerged Membrane (UF) Pressurized Membrane (MF) 24
Results of Pilot Operations Cleaning In-Place Requirements Membrane Test Flux (gfd) UF Approx Time to Lowest Allowable Flux (days) Ion Exchange, Sedimentation Enhanced Coagulation Enhanced Softening Ion Exchange 42 90+ 21 61 UF 49 28 22 -- 44 MF 54 90+ -- 90+ MF 54 -- 57 -- -- MF 64 2 7 -- 90+ UF = submerged ultrafiltration membranes MF = pressurized microfiltration membranes Longer days for cleaning = lower operating cost Higher flux = lower capital cost 25
Results of Pilot Operations Pilot Conclusions S Pre-treatment technology has an effect on membrane performance S Ion exchange was the best performing pretreatment technology for membranes S Finished water quality was consistent with varying source water quality S Submerged membranes were not viable with enhanced softening pre-treatment S Pressurized membranes may accommodate higher flux rates = reduced cost 26
Phase 2 Bench Goals Enhanced Taste & Odor Removal to Treat High Levels Experienced in 2004 Using: S Ultraviolet Light & Hydrogen Peroxide S Granular Activated Carbon 28
Phase 2 Bench Test Results Post-Treatment Conclusions S Pre-membrane taste and odor treatment removes about 70% of MIB & Geosmin S Additional treatment required for high concentration algae events S Both GAC & UV effective for taste & odor removal S GAC has lowest cost Granular Activated Carbon Ultraviolet Light 29
Water Program Options Category Surface Water Options Groundwater Options Combination of Surface Water and Groundwater Options Supply 1 B 50 mgd existing lakes IX-PAC-SED-UF-GAC 1 C 50 mgd existing lakes PAC-ES-O 3 -BAF 1 F 50 mgd existing lakes ES-SED-RGF 1 A 50 mgd existing lakes PAC-ES-SED-MF/UF-GAC 1 E 40 mgd lakes; 10 mgd wells Same as 1 B 1 D 50 mgd existing lakes PAC-ES-SED-GAC-MF/UF 1 G 50 mgd existing lakes PAC-EC-SED-O 3 -BAF-UV Higher 50 mgd wells around. Operating lakes 2 B 50 mgd wells around lakes IX-ES-SED-RGF 3 A 25 mgd lakes, 25 mgd wells Lakes: ES-SED-MF/UF-GAC, Wells: ES-SED-RGF 3 B 25 mgd lakes, 25 mgd wells Lakes: IX-SED-MF/UF-GAC, Wells: IX-ES-SED-RGF 3 C 3 D 3 E Costs, Sludge Handling ES-SED-RGF (existing plant) Highest Annual Operating Cost, Odors, Sludge 30 Annual mgd lakes, 20 mgd wells Option 1 B, Little Wells: Benefit Option 2 A High Operating Cost, Lakes: Ion Exchange for Town of Palm Beach Not Interested in Dedicated Plant, 20 mgd lakes, 30 mgd wells Groundwater Lakes: Option 1 A, Wells: Option 2 A Eastern Floridan. Lakes: Wells Not Viable 10 mgd lakes, 40 mgd wells Option 1 A, Wells: Option 2 A 3 F 40 mgd lakes, 10 mgd wells Lakes: Option 1 A, Wells: Option 2 A 3 G 40 mgd lakes, 10 mgd seawater Lakes: Option 1 A, Seawater: Desalination 20 mgd wells, 37 mgd Floridan Wells: Existing plant, Floridan: Reverse Osmosis 40 mgd wells, 12. 5 mgd Floridan Wells: Existing plant, Floridan: Reverse Osmosis 5 60 mgd wells around lakes Nanofiltration Membranes 5 A 60 mgd wells along Canal - west Same as 5 A located out west 4 B 4 C 4 D Groundwater & Membranes Not Acceptable to the Health Department 2 A 4 A Surficial Aquifer & Floridan Aquifer Groundwater Treatment Not Optimal Ratio Surface Water to Groundwater For 30 mgd wells, 25 mgd Floridan Wells: Existing plant, Floridan: Reverse Osmosis Utilization of Existing Plant Infrastructure Western Wellfield Not Viable, Nanofiltration High Capital Same as 4 A, Floridan wells west Same as 4 A with Floridan Wells located out west
Options Cost Comparison Option Description 2012 Capital Cost Annual Operating Cost 30 -Year Net Present Value $375, 771, 000 1 B IX-PAC-SED-UF-GAC $63, 441, 000 $6, 200, 000 1 G Blue Ribbon Panel PAC-EC-SED-O 3 -BAF-UV $58, 459, 000 $11, 000 $495, 570, 000 3 C Lake: IX-PAC-SED-UF-GAC $75, 201, 000 $7, 700, 000 Wells: ES-SED-RGF $430, 535, 000 Option 1 B is recommended because it has the lowest life-cycle cost and utilizes the Tiers 1, 2, & 3 improvements. 32
Options Quality Comparison Benefits of Option 1 B S Better Pathogen Removal S Better Removal of Micro Constituents (pesticides, herbicides, pharmaceuticals) S Better Removal of Volatile Organics S Better Removal of Arsenic (if present) S Better Removal of Total Organic Carbon S Better Removal of Color S Better Removal of Taste & Odor Compounds 33
34 Recommended Plant Layout
Program Costs & Bonds Year Cost Bond 2012 $63, 441, 000 Planned 2012 Bond Series 2020 $16, 047, 500 Future Bonds for Plant Capacity Expansion for Max Day Demand 2026 $13, 068, 100 Future Bonds for Membrane Capacity Expansion for Average Day Demand Good News S Rate increase not required for 2012 bonds S Implementing a conservation program can defer future expansion 35
60. 0 55. 0 Maximum Daily Demand (mgd) Potential Impact of Conservation – Max Daily Flow 50. 0 45. 0 40. 0 Plant Expansion Deferred to 2036 with 10% Conservation Plant Expansion 2023 Required By 202 with no Conservation 35. 0 30. 0 2013 2016 0% Conservation 2019 2022 5% Conservation 2025 2028 2031 10% Conservation 2034 2037 2040 2043 Existing Plant Capacity 36
50. 0 48. 0 Average Daily Demand (mgd) 46. 0 44. 0 42. 0 Membrane Treatment Capacity = 40 mgd 40. 0 with Potential Impact of Conservation – Average Daily Flow 38. 0 Membrane Expansion Deferred to 2045 with 10% Conservation 36. 0 34. 0 Membrane Expansion Required By 2027 with no Conservation 32. 0 30. 0 2013 2016 0% Conservation 2019 2022 2025 5% Conservation 2028 2031 10% Conservation 2034 2037 2040 2043 Membrane Capacity 37
Next Step Obtain Commission Approval for Staff Recommended Option 1 B S Lowest Operating Cost S Lowest Life-Cycle Cost S Better Pathogen Removal S Better Removal of Micro Constituents S Better Removal of Volatile Organics S Better Removal of Arsenic (if present) S Better Removal of Total Organic Carbon S Better Removal of Color S Better Removal of Taste & Odor Compounds S Satisfies Consent Order 40
QUESTIONS 41
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