Upload
laura-quinn
View
213
Download
0
Tags:
Embed Size (px)
Citation preview
July 2009July 20091
Coastal Water ProjectCoastal Water Project
Capital and O&M Cost DescriptionCapital and O&M Cost Description
North Marina Alternative -North Marina Alternative -Desalination Plant SiteDesalination Plant Site
2
IntroductionIntroduction
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
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)
Cost Estimate History Capital Costs Annual 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
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)
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 Capital Cost Estimate
Capital Cost DescriptionPipeline
PumpStation Well
ProcessEquipment
Building/Structure
CivilWorks Tank
Elec.I&C Property
Allowance (% of total)
Construction Costs
Off-Site Feedwater & Brine Facilities X X NM ML NM NM X
Desalination Plant X X X X X X X
Desalinated Water Conveyance X X X X X X
Terminal Reservoir & ASR PS X X X X X X X
ASR System X X X X X X
Implementation Costs X
ROW Easement & Land Acquisition X
Contingency Allowance X
ML = Moss LandingNM = North MarinaX = Both Sites
8
PipelinesPipelines
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)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 StationsPump 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 WellsASR 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 WellsSlant 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 EquipmentProcess 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 & StructuresBuildings & 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 WorksCivil 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)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)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)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
PropertyProperty
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
AllowancesAllowances
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)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.
22
North Marina Capital Cost Estimate North Marina Capital Cost Estimate Summary ( 2009 $)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
23
Accuracy of EstimateAccuracy 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.
24
Operation & Maintenance CostsOperation & Maintenance Costs
O&M Cost DescriptionEnergy Chemicals Labor
Membrane Replacement
GeneralR&R
O&M CostsAvoided
Facilities
Off-Site Feedwater & Brine Facilities X NM
Desalination Plant X X X X X
Desalinated Water Pumping X X
Terminal Reservoir & ASR PS X X
ASR Wells X X X X
Valley Greens PS X X
Begonia Iron Removal Plant X X X X
Segunda PS X X X
Seaside Wells X
General System X
ML = Moss LandingNM = North MarinaX = Both SitesO&M Costs Avoided Include: Energy, Chemicals, & Labor
25
EnergyEnergy
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)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
ChemicalsChemicals
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
LaborLabor
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 ReplacementRepair 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 AvoidedO&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 ProjectNorth Marina ProjectO&M Cost EstimateO&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
End of Formal Presentation