1 / 32

Coastal Water Project

Coastal Water Project. Capital and O&M Cost Description North Marina Alternative - Desalination Plant Site. Introduction. Present cost estimates for North Marina Project Alternative including key assumptions and approach Workshop Presenters: Mark Schubert, PE, CAW

corin
Download Presentation

Coastal Water Project

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Coastal Water Project Capital and O&M Cost Description North Marina Alternative - Desalination Plant Site

  2. Introduction • Present cost estimates for North Marina Project Alternative including key assumptions and approach • Workshop Presenters: • Mark Schubert, PE, CAW • Paul Findley, PE, RBF Consulting • Dave Stephenson, CAW • Data and assumptions derived from cost estimates contained in Attachments K and L of the Schubert Testimony, dated May 22, 2009

  3. North Marina Project • First Proposed in PEA, 2005 • Basic Components, per DEIR: • 11 mgd Desalination Plant in North Marina • Sourced from Slant Wells • Return up to 800 afy to water users in Salinas Valley • Brine Disposal to MRWPCA Outfall • Pipelines to CAW Service Area • Terminal Reservoir • Pump Station and Pipeline to ASR Wells • 2 New ASR Wells + 2 Existing ASR Wells

  4. North Marina Project (cont’d) Cost Estimate History Capital CostsAnnual O&M Costs • PEA: $214M $7.8M (gross) (2005 $) (for 11,730 afy) • Current: $250M $9.6 -10.1M (gross) (2009 $) $7.6M-8.1M (net) (for 10,100-10,900 afy)

  5. North Marina Cost Estimates • Changes, Compared to PEA Estimate: • Updated to 2009 dollars (from 2005 dollars), checked previous estimates, and added more detail • Slant well intakes instead of HDD well intakes • 11mgd desalination plant capacity, instead of 10 mgd • Added facilities for delivery of up to 2 mgd to CSIP system • Brine disposal to MRWPCA Outfall instead of MLPP Outfall

  6. North Marina Cost Estimates (Cont’d) • Changes, Compared to PEA Estimate: • Added pressure dual media filters • Added 20% RO standby capacity • Incorporated same system changes as Moss Landing Project, south of Reservation Road • O&M costs estimated at meeting 15,200 afy total CAW system demand plus 800 afy to CSIP • Assumed power from grid instead of self-generation

  7. Capital Cost Estimate ML = Moss Landing NM = North Marina X = Both Sites

  8. Pipelines • Cost Components: • Material • Adjusted Vendor Quotes for Pipes • Type II Asphalt Concrete • Erosion Control (BMP) • Labor & Equipment • ROW Preparation, Pipeline Installation, Erosion Control, Surface Restoration, & Bore Pit Construction • Prevailing Wages per Department of Labor • Variable Production Rates for Standard Crews • Off-site Transport and Storage of Excavated Material • Required Equipment per Construction expert

  9. Pipelines (cont’d) • Special Construction • $1,500/ LF for Jack and Bore • Dewatering Wells = $32,000 per Jack and Bore Crossing • Cathodic Protection • $5/ LF for metallic pipelines • Contractor Overhead & Profit (OH&P) • 18.5% of all above costs

  10. Pump Stations • Desalinated Water PS & ASR PS: • Quantity estimates and unit prices per recent similar project estimate • All Other Pump Stations: • Equipment estimated on $/ Installed HP, plus 25% for taxes, installation, & material, plus 18.5% for contractor OH&P • Building based on $110/ SF, includes contractor OH&P • Wet wells based on $700/ CY of concrete

  11. ASR Wells • Monitoring Well, Core, & Test well at ASR Well 3 • Test Well at ASR Well 4 • Stainless Steel Material for Test Wells • Wellhead facilities at ASR Wells 3 & 4 • Conversion of Test Wells to Production wells • Well Pumps • Electrical & Pump Building • Well Field Piping & Civil Work • Electrical, I&C • Back flush Water Reclamation Facility • Estimates from ASR Systems • Contractor OH&P included in above

  12. Slant Wells • Test Slant Well & 5 Additional Production Slant Wells • $13.8 million, Including contractor OH&P • Slant Well Drilling costs detailed by Doheny State Beach Slant Well Driller • Stainless Steel Material • Includes: • Well Pumps & Installation • Well Development & Testing • Testing / Development Water Disposal facility • Civil works and well head vaults • Electrical, I&C • Electrical Costs Include additional $250,000 for upgraded service to site

  13. Process Equipment • Cost Components: • Vendor Supplied Equipment • RO System, Pressure Filters, Pumps, Screens, & Chemical Systems • Includes Delivery, Taxes, Manuals, Testing, & Training • Installation • Includes Labor, Equipment, & Contractor Supplied Appurtenances • Estimate based on expert consultation and experience • Building, Electrical, I&C, and Site Work • Estimated Separately • Contractor OH&P • 10% for RO Equipment • 18.5% for other installed equipment • The North Marina RO Process Facility cost was developed by multiplying the Moss Landing RO Process cost by a factor of 1.10

  14. Buildings & Structures • Floor Slabs, Foundations, and Hydraulic Structures were estimated at $1100/ CY • Superstructures were estimated at: • $120/ SF for large process buildings • $110/ SF for pump stations • $350/ SF (first floor area) for two story admin building • Detailed estimates for buildings were estimated using commercially available cost estimating software

  15. Civil Works • Line Items in the Estimate: • Desalination Plant Earthwork, Sitework, & Piping • Terminal Reservoir Earthwork, Sitework, & Piping • ASR Backflush Reclamation Basin • Dried Solids Storage • RO Clean in Place (CIP) Waste Storage

  16. Civil Works (cont’d) • Unit Costs: • General Site work $5/ SF • Site Preparation • Rough Grading • Fine Grading • Paving • Landscape & Irrigation • Site Lighting & Security • Fencing • Excavation / Backfill $7/ CY • Yard Piping $400/ LF • Above Costs Include 18.5% Contractor OH&P

  17. Tanks (Reservoirs) • Circumferentially Pre-stressed, Post-Tensioned Concrete Tanks w/ Concrete Covers • Partially Buried Clearwell: $1.75/ gallon • Clearwell at Moss Landing: $1.50/gallon • Buried Terminal Reservoir: $1.75/ gallon • Costs Include 18.5% Contractor OH&P • Earthwork, Site work, and Piping estimated separately • Based on analysis of two similar recently constructed projects

  18. Electrical, Instrumentation &Control (I&C) • Desalination Plant Electrical /I&C • Power intensive facility • Allowance of 25% of other plant non-electrical costs, based on recommendation from electrical engineering expert • Includes plant control systems, and SCADA system for remote communications and control • Other Facilities Electrical /I&C • Allowance of 5 to 15% of facility non-electrical costs, depending on power intensity of facility • Includes connection to SCADA system

  19. Property • Site Acquisition • Desalination Plant and other above ground facilities • Based on 2009 communication with licensed real estate appraiser: • Residential: $400,000 - $1,000,000/Acre • Light Industrial: $600,000 - $800,000/Acre • Agricultural: $3,000 - 40,000/Acre • ROW Acquisition for Pipelines (Present Worth) • Transportation Agency of Monterey County and private agricultural lands evaluated by licensed real estate appraiser

  20. Allowances • Electrical / I&C • Contractor OH&P • 18.5% except for RO Equipment at 10% • Contractor Mobilization/Demobilization • Included in OH&P. Added 1% for Desalination Plant only

  21. Allowances (cont’d) Implementation Project Administration and Management, Engineering, Legal Design/Bid/Build Facilities: Used 30% of base construction costs, based on experience, excluding costs through December 31, 2008. Design/Build Facility: Used 20% of base construction costs Contingency Covers unanticipated changes in project scope or schedule due to unforeseen changed site conditions; regulatory or institutional requirements, including mitigation implementation and permit compliance; and acts of nature. 20%, based on AACEI, for “conceptual design” stage of project development. 21

  22. North Marina Capital Cost Estimate Summary ( 2009 $) Off-site Feedwater/Brine $ 20M Desalination Plant $ 81M Desalinated Water Conveyance $ 38M Terminal Reservoir/ ASRPS $ 15M ASR System $ 10M Subtotal for Construction $ 164M Implementation Costs $ 42M Present Worth of Land/ROW Costs $ 5M Contingency Allowance $ 42M Total Capital Costs $ 253M Rounded to $ 250M 22

  23. Accuracy of Estimate Cost estimating accuracy is typically keyed to project development stage North Marina Alternative between Class 3 and Class 4 AACEI Class 3-Budget, 10-40%: -10/20% to +10/30% AACEI Class 4-Study, 1-15%: -15/30% to +20/50% Used -15%/+25 % Final North Marina Project capital costs could be in range of $210M to $310M in 2009 Dollars. 23

  24. Operation & Maintenance Costs ML = Moss Landing NM = North Marina X = Both Sites O&M Costs Avoided Include: Energy, Chemicals, & Labor

  25. Energy • Energy Rate Schedules were selected considering: • Based on PG&E Tariffs • Load • E-19 (< 1000 kw) • E-20 (> 1000 kw) • Grid Voltage • Transmission Voltage • Primary Voltage • Secondary Voltage

  26. Energy (cont’d) • Unit Costs for Energy for each facility were developed considering: • Time of day (Peak, Partial Peak, Off-Peak) • Season (Summer / Winter) • Service Voltage • Maximum Demand per Month • Average Use per month • Diurnal Load Profiles • Energy Unit Costs: $0.079 - $0.142 /kWh • North Marina Desal Plant Unit Costs • Winter $0.093 / kwh • Summer $0.136 / kwh • Highest Unit Cost is at remote pump stations

  27. Chemicals • Variable according to annual production • Chemicals and dosages per DEIR Project Description • Chemical costs obtained by 2009 quotation from national vendor • Bulk delivery and storage

  28. Labor • Fixed, does not vary with annual production • Operations labor categories and rates from CAW- Monterey • Desalination plant staffing levels estimated on basis of two other desalination plants and consultation with industry experts

  29. Repair and Replacement • Assumed replacement of 15% of membranes every year starting in 2017 for North Marina Project • Assumed R&R for structures, buildings, and civil works at 1% of original cost, per year. • Assumed R&R for mechanical and electrical systems at 3% of original cost, per year.

  30. O&M Costs Avoided • Project will reduce production and operations costs at: • Begonia WTP (BIRP) by 6,900 afy, $1.36M annual reduction • Segunda PS, by 6,900 afy, $0.37M annual reduction • Seaside Wells, by 2,200 afy, $0.28M annual reduction • Datum used is current conditions: • Begonia WTP (BIRP) at 11,500 afy • Seaside Wells at 3,700 afy • Avoided costs were developed on basis of existing operational data, calculation of avoided power, and consistent (calculated) energy unit cost

  31. North Marina ProjectO&M Cost Estimate For 2021, in 2009 Dollars, at 10,900 AFY: Desalination Plant: $ 9.2M Desalinated Water Conveyance: $ 0.5M ASR System: $ 0.5M Total (gross) $10.2M Costs avoided: ($ 2.0M) Total (net) $ 8.2M 31

  32. End of Formal Presentation

More Related