60% Design and Cost Estimate

Clean Water Facility

60% Estimate Review

City Council Special Workshop 2

• Project Team• City of Oak Harbor• Carollo Engineers• Hoffman Construction• KBA Construction Management• OAC – Project Advisor• HDR – Rates• PFM – Funding Advisor

Introductions

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• 60% Design Cost Estimate• Bio-solids Alternatives• Community Room Options• Funding and Rates

Agenda

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60% Cost Estimate

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• 2008 Sewer Comp Plan – Anaerobic Cell at Lagoons• 2010 Facilities Plan – Site and process selection• 2013 Selected Windjammer Park• 2014 Selected and Purchased former WIB property• 2014 Selected GC/CM Process and Hoffman

Background

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• 60% Engineers estimate provides a probable range of cost • -5% to +15%

• GC/CM provide opinion of cost for a Guaranteed Maximum Price. • Conservative escalation factors, allowances and contingencies

“Budget Number”• Think of these numbers as the “Bookends” of potential

construction costs• Estimate is not a bid!

GC/CM “Opinion of Cost” vs. “Engineers Estimate”

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• Incorporated Cost Savings from 30% review• Reduced Deep Excavation Footprint• Headworks / MBR Common Wall• Electrical, Instrumentation and Controls

30% 60%What’s Changed?

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• Greater Detail in Drawings• More Advanced Vendor Quotes• Site Prep A – Better Understanding of Site Risks• Confirmed Depth to Glacial Till• Some Systems Showed an Increase in Cost• Others Systems Showed a Decrease in Cost

30% 60%What’s Changed?

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• Everything inside the box to the right

• Architectural Concept A• Construction Only!• Does not include splash park

What’s included in the Opinion of Cost?

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• Bio-solids Dryer• Community Room• Rebuilding City Beach Street• Southern Access Road• Architectural Concept A

What’s Included

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• Demolition of former bank building• North parking lot• Southern parking lot• Mitigation• Property / Easements / Right of Way• Engineering / Construction Management /

Archaeology

What isn’t included

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60% Cost Estimate

Carollo Hoffman$60M

$70M

$80M

$90M

$100M

$110M

$120M

$98M

$113M

$91M

$109M

30% 30%60% 60%

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Area 30% 60% Delta % DeltaAdmin/Maintenance $6,576,485 $5,957,850 ($618,635) -9.4%

Community Center $1,670,560 $2,372,686 $702,126 42.0%

Landscaping $766,966 $2,446,105 $1,679,139 218.9%Civil Sitework $17,522,245 $17,869,334 $347,089 -2.0%Headworks $13,225,668 $13,226,368 $700 0.0%Secondary Building $28,521,730 $26,447,663 ($2,074,06

7) -7.3%

AB WAS Storage $13,272,552 $13,022,498 ($250,054) -1.9%Blower Building $2,009,339 $2,657,458 $648,119 32.3%

Biosolids Facility $17,827,572 $14,615,311 ($3,295,443) -18.5%

Odor Treatment $4,036,544 $4,820,893 $784,349 19.4%

Electrical Building $7,873,971 $5,543,733 ($2,330,238) -29.6%

Total $113,303,660 $108,896,717

($4,406,943) -3.9%

Hoffman 30% vs. 60%

We will discuss these two later

in the presentation

We will discuss these two later

in the presentation

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Description CostsDirect Costs $9,046,471Escalation Allowance $550,046Market Conditions Allowance $136,241Design Contingency $622,807Subcontractor Bonding $47,819Negotiated Support Services $644,488GMP Contingency $386,676SUBTOTAL, GMP $11,434,547GC/CM Specified General Conditions $243,826

GC/CM Fee $489,399Sales Tax $1,058,596Total Construction Costs $13,226,368

Headworks Breakdown

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• Mechanical• Concrete• Contingency Factors• Construction Indirect Costs• Explore Options to Increase Value and

Reduce Cost

Cost Savings Moving Forward

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Questions?

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Bio-solids

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Background: “Biosolids 101”• What are biosolids?

“Sewage sludge” are the solids that settle out in the wastewater treatment process. “Biosolids” are produced by treating sewage sludge to meet standards that allow for beneficial use.

• How can biosolids be used?Biosolids can be used in different ways, depending on their classification. “Class B” biosolids must be land applied in bulk at a permitted site. “Class A” biosolids can also be land applied in bulk, and may even be bagged and sold if they are high enough quality.

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Biosolids Reuse in Washington

Covered dump truck

Dewatered biosolids

King County’s “Loop” Trucks

Land application in Eastern WA

SoundGRO Fertilizer

Pierce Co, WA

Dried Biosolids Loading

Alderwood, WA

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Background: Oak Harbor’s Plan

• Several alternatives evaluated in Facilities Plan, including: Beneficial reuse of dried Class A biosolids Beneficial reuse of lime-stabilized Class B biosolids Landfilling dewatered untreated solids that do not meet reuse standards

• Dryer for Class A biosolids preferred long-term solution Most flexibility for local reuse (Potential revenue source to reduce annual O&M cost) Reduced truck traffic “Manageable” odor and aesthetic risk

• Lime-stabilization for Class B proposed for Phase 1 Lower initial capital cost, but higher cost for hauling to Eastern WA Provides time to develop and implement Class A beneficial reuse program

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What has changed since planning?• Lime stabilization not recommended at Windjammer Vicinity

Potential for odor, mess Large footprint required to store treated biosolids Truck traffic (lime deliveries; Class B biosolids off-haul)

• Cost of Class A dryer has increased between planning and 60% More proven technology (that is also larger, more expensive) selected

to reduce risk and increase operator safety• Estimated total WWTP construction cost at 60% motivates

review of solids treatment alternatives to reduce impact to rate payers

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What alternatives are currently being considered?

• “Base Case”: Beneficial Reuse of Class A Biosolids Construct on-site dewatering and thermal drying to Class A Beneficial reuse of biosolids on Whidbey Island NOTE: Basis of current 60% cost estimate

• Alternative 1: Beneficial Reuse of Class B Biosolids Construct on-site dewatering Construct off-site treatment with lime stabilization to Class B Haul lime-stabilized biosolids for beneficial reuse in Eastern Washington

• Alternative 2: Landfill Disposal of Unclassified Solids (Interim Only) Construct on-site dewatering Haul dewatered solids to landfill (extending 2-year period requires Ecology

exemption)9/30/2015


“Base Case”: Beneficial Reuse of Class A BiosolidsSolids Process Schematic

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TRUCK LOADING

DEWATERING

DRYING

WAS STORAGE

SOLIDS BUILDING

“Base Case”: Beneficial Reuse of Class A BiosolidsSite Plan & Solids Building at WWTP

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“Base Case”: Beneficial Reuse of Class A BiosolidsSummary of Estimated Costs

Base Case - Class A Dryer Estimated Cost Notes

Based on 60% design

8,700 sf building with dryer installed

Assumes 1 FTE for solids process

Assumes $0 for hauling/Class A reuse

10-year Annualized Cost (Capital + O&M) $2.2 M Assumes 3% interest

Capital Cost (WWTP)

Annual O&M Cost

$14.5M

$500,000

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“Base Case”: Beneficial Reuse of Class A BiosolidsAdvantages and Challenges

Advantages• Consolidates solids treatment at

WWTP• Fewest truck trips to/from WWTP• Beneficial reuse consistent with

Ecology requirements• Class A provides flexibility for

reuse options• Potential revenue to offset O&M

cost

Challenges• High Capital Cost• High Operating Cost• Requires development of

Class A Biosolids Program• Additional complexity for

O&M9/30/2015


Alternative 1: Beneficial Reuse of Class B BiosolidsSolids Process Schematic

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Alternative 1: Beneficial Reuse of Class B BiosolidsSite Plan at WWTP

WAS STORAGE

SOLIDS BUILDING

TRUCK LOADING

DEWATERING

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Alternative 1: Beneficial Reuse of Class B BiosolidsSite Plan Off-Site (Lime Stabilization Facility)

Lime Stabilization Facility

Lime Stabilized Biosolids

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Alt 1 - Class B Lime Stabilization Estimated Cost Notes

Based on 60% design

5,800 sf building, no dryer

Based on preliminary information

Assumes facility at City Shops

Total Capital Cost Range $12.2M - $13.2M

Assumes .5 FTE for solids process

Includes $316,000 hauling to Eastern WA

10-year Annualized Cost (Capital + O&M) $2.1M - $2.2M Assumes 3% interest

Capital Cost (WWTP) $8.2M

Annual O&M Cost $672,000

Capital Cost (Off-Site Lime Facility) $4.0M - $5.0M

Alternative 1: Beneficial Reuse of Class B BiosolidsSummary of Estimated Costs

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Alternative 1: Beneficial Reuse of Class B BiosolidsAdvantages and Challenges

Advantages• Potentially reduced Capital

Cost• Beneficial reuse consistent

with Ecology requirements

Challenges• High Operating cost• Additional truck trips to/from

WWTP• Limited flexibility for reuse of

Class B biosolids• Separates biosolids handing and

treatment from WWTP• Requires another site• Likely requires amendment to

Facilities Plan and Environmental Documents 9/30/2015


Alternative 2: Landfill Disposal of Unclassified SolidsSolids Process Schematic

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WAS STORAGE

SOLIDS BUILDING

DRYING (FUTURE)

Alternative 2: Landfill Disposal of Unclassified SolidsSite Plan at WWTP

TRUCK LOADING

DEWATERING

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Alternative 2: Landfill Disposal of Unclassified SolidsSummary of Estimated Costs

Alt 2 - Interim Landfill Estimated Cost Notes

Based on 60% design

8,700 sf building, no dryer

Assumes .3 FTE for solids process

Includes $200,000 hauling to landfill

10-year Annualized Cost (Capital + O&M) $1.5M Assumes 3% interest

Annual O&M Cost $440,000

Capital Cost (WWTP) $9.4M

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Alternative 2: Landfill Disposal of Unclassified SolidsAdvantages and Challenges

Advantages• Reduced Capital Cost• Reduced O&M Cost• Class A facilities can be

phased-in over time

Challenges• Not consistent with Ecology

requirements – requires exemption

• Interim solution• Limited flexibility for

disposal of unclassified solids

• Likely requires amendment to Facilities Plan and Environmental Documents

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Summary of Solids Alternatives

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Questions?

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Community Room

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• 60% cost estimate based on Concept A

Community Meeting Room

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City Council Special Workshop


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• +/- 146 w/o tables• +/- 102 w/tables


Description CostsDirect Costs $1,570,687Escalation Allowance $95,501Market Conditions Allowance $23,655Design Contingency $155,468Subcontractor Bonding $20,958Negotiated Support Services $115,615GMP Contingency $69,366SUBTOTAL, GMP $2,051,250GC/CM Specified General Conditions $43,740

GC/CM Fee $87,794Sales Tax $189,902Total Construction Costs $2,372,686


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Community Meeting Room• Benefits• Construction

Efficiency• Provide greater

integration into park• Economic

development

• Challenges• Business case• Operations• Securing funding

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• Cost Estimate for Concept B under development


Without Community Meeting Room

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• Concept B without Community Meeting Room


• Sewer Fund shouldn’t bear the entire burden• Approximately half could be paid by Utility

Funds• The other half by the general fund, grants,

etc…

Funding Options

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Options

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1. Include Community Room 2. Remove Community Room3. Keep Community Room in Design as an

Additive/Alternate bid item


Questions?

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Funding & Rates

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City Council Special Workshop 499/30/2015


Summary

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• We have more work to do!• There are more opportunities for cost savings• We have a great team! (City, Carollo, Hoffman,

OAC, KBA, …)• The bid prices are the ultimate determination

of cost!

Summary

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• October 20 – City Council Meeting• Resolution 15-xx – Community Room• Resolution 15-xx – Bio-solids Handling• GMP #4 – Site Prep Package B• GMP #5 – Bio-Solids Dryer Procurement• Consultant Agreement Amendments

What’s Next

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60% Design and Cost Estimate

Government & Nonprofit

Transcript of 60% Design and Cost Estimate