MMWD Drought Resiliency Committee Meeting

Transcription

1 MMWD Drought Resiliency Committee Meeting December 11, 2015

2 Purpose and Agenda Purpose: Identify opportunities and feasibility of implementing a recycled water system supplied by CMSA to augment MMWD s water supply for the region. Presentation Agenda: Market Identification/Project Alternatives Recommended Project Next Steps 2

3 Market Identification/ Project Alternatives 3

4 Initial Recycled Water Market Identification for Urban Uses Month Number of Sites Total Estimated Annual Demand (AFY) Landscape Irrigation Commercial Uses San Quentin Prison Total

5 Initial Market Identification - Subgroups Kentfield Marin County Mart CMSA North San Quentin Greenbrae Doherty Type of Users Considered: Irrigation Commercial car washing and boilers San Quentin Prison dual plumbing, boiler use, car washing, irrigation 5

6 RW Market identified for the 6 subgroups Four conceptual alternatives identified: 1. Reuse at San Quentin 2. Urban reuse from centralized treatment 3. Satellite plants 4. Direct potable reuse (DPR) Total of 17 sub-alternatives defined, costed, screened and ranked 6

7 Alternative 1 Reuse at San Quentin Alt. No. Treatment Type Estimated Demand, AFY Project Cost, $ M Unit Cost per AF 1A CBW Filtration + Cl 153 $6,590,000 $2,490 1B MF + Cl 153 $8,530,000 $2,920 1C MF/RO + UV 153 $10,310,000 $3,440 7

8 Alternative 2 Centralized Treatment 2BP3 2A Alt. No. Alt. Name Estimated Demand, AFY Project Cost, $ M Unit Cost per AF X 2A CMSA North 44 $6,840,000 $8,910 X 2BP1 Marin County Mart 39 $7,510,000 $10,710 X 2BP2 Greenbrae 106 $15,640,000 $7,180 X 2BP3 Kentfield 81 $11,500,000 $7,280 X X 2C 2BP4 Doherty Drive Marin County Mart Only 113 $13,480,000 $5, $5,290,000 $9,480 2BP2 2BP1 2BP4 2C Marin Country Mart Only 8

9 Alternative 3 Satellite Treatment 3D Kentfield Select 3A 3E Greenbrae Select 3B 3C Alt. No. Alt. Name Estimated Demand, AFY Project Cost, $ Unit Cost per AF X 3A Kentfield Area 81 $12,140,000 $7,320 X 3B Greenbrae Area 106 $15,780,000 $7,100 X 3C Doherty Area 113 $14,430,000 $6,110 3D Kentfield Select 42 $5,310,000 $7,130 3E Greenbrae Select 49 $6,860,000 $7,570 9

10 Satellite Treatment Plant Schematic 10

11 Alternative 4 - DPR X X Alt. No. Alt. Name Estimated Demand, AFY Project Cost, $ M Unit Cost per AF 4A SQP Only 0.5 $13,480,000 $1,220 4B DPR $43,360,000 $1,270 4C DPR $88,260,000 $1,100 11

12 IPR Groundwater Recharge Regulatory acceptance and framework exists. 12

13 IPR - Surface Water Augmentation A reservoir that receives recycled municipal wastewater. Regulatory framework in development due Dec

14 DPR Treatment Plant Schematic Regulatory framework does not exist. 14

15 Potential Site For DPR Plant 15

16 Economic Comparison of Preferred Alternatives Alt. No. Alt. Name Capital Cost, $M Project Cost, $M Annual Cost, $M/year Cost per AF (Potable Offset) 1A SQP Conventional $5.27 $6.59 $381,000 $2,490 1B SQP MF $6.82 $8.53 $447,000 $2,920 1C SQP MF/RO $8.25 $10.31 $529,000 $3,440 3D Kentfield Select $4.25 $5.31 $297,000 $7,130 3E Greenbrae Select $5.49 $6.86 $367,000 $7,570 4B DPR 2 $33.35 $43.36 $2,874,000 $1,270 16

17 Non-Economic Comparison of Preferred Alternatives Alt 1A SQP Conventional Cost (2) Economic Cost Sharing Energy Use Reg Acceptance Potable Offset Implementation Considerations Public Acceptance Ability to Phase Constructability Ease of Implement Admin Ease Total Score 1B SQP MF C SQP MF/RO 3D Kentfield Select 3E Greenbrae Select B DPR NOTES: (1) Scoring from 1 to 10 with 10 being the best. (2) This was screened on based on the unit cost of the alternatives ($ per AF) rather than the total annual cost. 17

18 Recommended Project 18

19 Recommended Project (1B. SQP MF) Treat water at CMSA using microfiltration and chlorine disinfection Pipe water to San Quentin for: Dual plumbing (121.7 AFY) Boiler make-up water (14.3 AFY) Landscape irrigation (16.4 AFY) Car wash (0.1 AFY) Includes retrofit cost for dual plumbing Retrofit cost assumes N, S, E, & W blocks are already partially dual plumbed Does not include cost of onsite RO 19

20 Treatment Layout at CMSA 20

21 Cost Breakdown Description Recommended Project Cost (1) Treatment $3,154,000 Pump Station $721,000 Piping to the Prison $1,140,000 Dual Plumbing $1,666,000 Storage $106,000 Commercial Customer Conversion (2) $35,000 Total Capital Cost, $ $6,820,000 Project Cost Soft Costs (3) $1,710,000 Total Project Cost, $ $8,530,000 Annualized Project Cost, $ / year (4) $330,000 O&M Cost, $ / year (5) $117,000 Total Annual Cost, $ / year $447,000 Volume Water Delivered (AFY) 153 Unit Cost per AF (6) $2,920 NOTES: (1) ENRCCI _SF = 11,155 (July 2015). (2) Based on conversion of commercial customers only (@ $20,000 per customer) plus incidental amount for irrigation customers (@ $5,000 per customer). (3) Includes Engineering, Legal, Administration and Change Orders (25% of Capital Cost). (4) Discounted at 1% over a 30 year period. (5) Includes annual costs for energy, chemical use, equipment maintenance, and labor. (6) If instead of chlorine disinfection UV disinfection is used the project cost is $8.75 million and the unit cost per acre foot is $3,

22 Summary and Next Steps 22

23 Recycled Water Overview RW Pilot in 1976 Plant Construction in 1979 Plant expansion in 1989 Today 345 customers, 25 miles of distribution pipeline conveying AF per year Reservoir water SCWA Recycled 77 23

24 Recycled Water Overview con t. Existing system - 1 customer at a time. System Expansion Due Diligence Southern Marin Recycled Water System (80 AF $3.5M) CMSA/MMWD Recycled Water System (152 AF $8.5M) Next Steps: Explore partnership and funding options. Projects will be considered as part of overall Drought Resiliency. 24

25 Questions? 25