Whatcom County – Levee SWIF

Reach 4 Levee Setback Alternative 1 (Review)

Levee Setback Alternative 2

Presenter: David Cline, P.E., C.F.M. – Shannon & Wilson Inc.

Reach 4 – Levee Setback Alternative 1

Alternative 1 ReviewAlternative 2 Plan and Cost EstimatesCompare Existing and Alternatives Maintenance Costs

Reach 4 – Levee Setback Alt 1. Concept Design Plan

Reach 4 – Levee Setback Alternative 1Planning Level Cost Estimate

Description Low Cost Est. High Cost Est. New Setback Levee $12.0M $22.0MPipeline Protection / Replacement $2.0M $5.0MHabitat Restoration of River and Floodplain $2.0M $4.0MProperty Acquisition & Real Estate Administration $0.5M $2.6MEngineering Design $2.5M $5.0MPermits (3% of construction) $0.5M $1M Wetland/Stream Mitigation (3:1 Ratio) (35acres) $3.5M $7.1MConstruction Administration (12% of construction) $2.1M $4.0MProject Contingency (35%) $5.9M $11.6M

Project Cost Estimate - YR-2014 $31M $62MProject Cost Estimate - YR-2024 $42M $83M

Note: Cost estimate is in 2014 dollars. If future project implementation is in 10 years, then budgets would need to be escalated for ~3% annual growth (i.e. $83M and $42M costs in 2024 for high and low cost estimates).

Reach 4 – Levee Setback Alt 2. Concept Design Plan

Summary Reach 4 – Levee Setback Alternative 2

Description Low Cost Est. High Cost Est.

New Setback Levee $10.3M $18.3M

Pipeline Protection / Replacement $2.0M $5.0MHabitat Restoration of River and Floodplain $2.0M $4.0M

Property Acquisition & Real Estate Administration $0.5M $2.3M

Engineering Design $2.2M $4.4M

Permits (3% of construction) $0.4M $0.8M

Wetland/Stream Mitigation (3:1 Ratio) (35acres) $2.8M $5.5M

Construction Administration (12% of construction) $1.8M $3.5M

Project Contingency (35%) $5.1M $10.2M

Project Cost Estimate - YR-2014 $27M $54M

Project Cost Estimate - YR-2024 $36M $73M

Levee EconomicsReach 4 – Existing Conditions 50-YR Repair Costs

1973-1989 1990-2008$0

$10,000,000

$20,000,000

$30,000,000

$40,000,000

$50,000,000

50-Year Repair Costs50-Year Repair Costs (Hook Related)50-Year Repair Costs

Levee Economics50-YR Maintenance & Repair Costs

Existing 50-YR ALT1 50-YR ALT2 50-YR$0

$10,000,000

$20,000,000

$30,000,000

$40,000,000

$50,000,000

50-YR Maintenance Cost

Corps - ExistingLocal - Existing

Levee EconomicsAnnual Maintenance & Repair Costs

Existing 50-YR ALT1 50-YR ALT2 50-YR$0

$200,000

$400,000

$600,000

$800,000

$1,000,000

Annual Maintenance Cost

Corps - ExistingLocal - Existing

Reach 4 – Alternatives Summary

Existing Alt. 1 Alt. 2Project Cost

(2014 $) -- $31M - $62M $27M - $54M50-YR Maint. ($)

Local Corps

$9.8M $39.4M

$7.6M$30.5M

$6.0M$24.0M

Annual Maint. ($)LocalCorps

$197k$887k

$152K $610k

$121K$482K

Floodplain Connectivity Area

~0 AC ~142 AC ~142 AC