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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

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Coastal water project

Coastal Water Project

Capital and O&M Cost Description

North Marina Alternative -

Desalination Plant Site


Introduction
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


North marina project
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


North marina project cont d
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)


North marina cost estimates
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


North marina cost estimates cont d
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


Capital cost estimate
Capital Cost Estimate

ML = Moss Landing

NM = North Marina

X = Both Sites


Pipelines
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


Pipelines cont d
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


Pump stations
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


Asr wells
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


Slant wells
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


Process equipment
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


Buildings structures
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


Civil works
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


Civil works cont d
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


Tanks reservoirs
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


Electrical instrumentation control i c
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


Property
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


Allowances
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


Allowances cont d
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.

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North marina capital cost estimate summary 2009
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

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Accuracy of estimate
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.

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Operation maintenance costs
Operation & Maintenance Costs

ML = Moss Landing

NM = North Marina

X = Both Sites

O&M Costs Avoided Include: Energy, Chemicals, & Labor


Energy
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


Energy cont d
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


Chemicals
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


Labor
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


Repair and replacement
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.


O m costs avoided
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


North marina project o m cost estimate
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

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