Wastewater Collection System Master Plan
August 24th, 2026
City of Fort Bragg
Agenda
• Introductions
• Wastewater Collection System
• Purpose and Goals
• Master Planning Process
• Key Accomplishments
• Current Performance & Future
Considerations
• Capital Plan
• Conclusion & Summary of
Recommendations
Introduction
Senior Project
Manager
Alex Johnson
Speaker
Chantell O’Neal
City Team
HDR Team
Project Manager - Assistant Director - Engineering
John Smith Director of Public Works
Heath Daniels Operations & Maintenance Supervisor
Diane O’Connor Assistant City Engineer
*Allan Scott Technical Advisor
*Scott Humphrey Technical Lead
Roger Null Technical Advisor
Joel Griffin Mapping/GIS
Mark Stanley Geotechnical Assessment
Nathalie Beauvais Climate Impact Assessment
*Morgan DeAngelis Risk Analysis/Risk Model
Wastewater Collection System
• 31 miles of gravity pipeline
• System Built (1960-2000s)
• 3 to 30 inches in diameter
• Clay, AC, CMP
• 3 miles of force mains
• HDPE, Techite, PVC, Steel
• 6 lift stations
This master plan assesses wastewater collection system upstream of the wastewater treatment plant inlet structures and includes evaluation the following infrastructure:
WWTP
Purpose and Goals
Purpose of the Master Plan
Assess the current & future
state
Identify near-term and longterm capital needs
Considerations: aging infrastructure, technological advances, community growth, and seismic, environmental, and climate risk.
Environmental
Risk/Climate Change
Geotechnical
Assessment
Master Planning Process
Hydraulic Model
Capacity Analysis
GIS Database
Risk Model
System
Improvements
Capital Improvement
Plan
Current
Near-Term
Build Out
Likelihood and
Consequence of
Failure
Other Planning
Recommendations
Prioritization
Capacity
Operational
Asset Renewal
New GIS dataset developed in Water Master Plan
Updated GIS with MH elevations & condition info
Assessments informed risk modeling
Flow Study to calibrate/validate hydraulic model
Modeling identified system improvements
Improvements packaged and prioritized
Other recommendations incorporated
Flow Study
Manhole Survey
CCTV Inspection
Modeled 3 capacity scenarios
Developed risk model
Lift Station
Assessments
Lift Station Assessments
Key Accomplishments
1. GIS database to support hydraulic
modeling, risk analysis, current and
future capital planning
2. Manhole elevation survey
3. Targeted CCTV condition
assessment
4. Flow Study
5. System hydraulic model
6. Current and future demand analysis
7. Build-out capacity analysis
8. Risk assessment model
9. Climate risk analysis
10.Geotechnical & environmental risk
analysis
11.CIP plan, including pipeline
replacement strategy
12.Analysis of potential funding
opportunities
Today – Wastewater Collection
System
• Generally satisfies current needs
• Low SSO Rate (1.2 spills/mile)
• System is aging
• Some critical lines have condition issues that
need to be addressed
• Techite force mains pose risk of failure
• Infiltration issues in some areas
• Increases overflow risk
• Increases flow to WWTP that needs to be
treated
• Identified areas of capacity deficiencies
• Increased overflow risk
WWTP
Planning for the Future
Flow Capacity, I&I, Condition Assessment
• Address condition of critical lines
• Old CMP lines
• Techite force main
• Identify & mitigate sources of infiltration
• Improvements flow capacity
• Targeted improvements to address existing
deficiencies/overflow risk
• Targeted improvements to support potential
future development
• Operational Improvements
• Condition assessment program
WWTP
Planning for the Future
Condition Assessment and Asset Renewal
Targeted Pipe Rehabilitation:
• Information & Conditions from CCTV
Surveys
• Hydraulic Model
• Risk Model
Recommend implementing a Condition
Assessment Program
• Monitor system as it ages
• Targeted inspections
Planning for the Future: Risks
Seismic activity, drought, wildfire, sea-level rise
1. Seismic Risk – Bridge crossings vulnerable to movement; consider ERDIP or articulating joints for critical lines
2. Densification – Soil spreading or groundwater shifts may cause settlement damage
3. Landslides & Bluff Erosion – Differential settlement or pipe stretching from slope failures
4. Soil Corrosivity – Coastal soils more acidic, increased pipe corrosion risk Priority CIP ID Project Name Driver Costa
1 P-01 Chief Celeri Dr Sewer Main Replacement Capacity $2,853,000 2 F-01 Elm Street Force Main CIPP Lining Renewal $1,053,000 3 P-02 WWTP Inflow Sewer Main Replacement Capacity $6,103,000 4 P-03 E Alder St Sewer Main Replacement Capacity $892,000 5 P-16 E Oak St Sewer Main Replacement IV Capacity $866,000 6 P-10 S Franklin St Sewer Main Replacement Capacity $351,000 7 P-11 S Harrison St Sewer Main Replacement Capacity $291,000 8 P-06 E Oak St Sewer Main Replacement III Capacity $377,000 9 P-34 North Fort Bragg Sewer Main Extension Build-outc $471,000
10 P-35 GP Mill Sewer Main Extension I (Noyo Center) Build-outc $471,000
11 R-01 CCTV Condition Inspection Renewal $500,000
12 R-02 Lift Station Rehabilitation Renewal $442,000
13 R-03 0-5 yr CIPP Lining Projectsb Renewal $500,000
14 O-01 CIP Update Other $110,000
Capital Plan – Next 5 Years
a Project Costs Escalated for Inflation
b Budget reserved to meet system renewal goal. Projects to be identified based on condition and risk, or emergent issues C Build-out projects contingent on development efforts
Next 5 Year Sub-Total : $15,280,000
Priority CIP ID Project Name Driver Cost a
15 P-05 E Oak St Sewer Main Replacement II Capacity $1,399,000 16 P-13 Cedar St Replacement I Capacity $1,224,000
17 P-18 E Laurel St Sewer Main Replacement Capacity $504,000 18 P-26 E Chestnut St Sewer Main Replacement II Capacity $1,725,000 19 P-29 Maple St Sewer Main Replacement Capacity $66,000 20 P-31 South Harold St Sewer Main Replacement Capacity $364,000 21 P-24 N Sanderson Way Sewer Main Replacement Capacity $416,000 22 P-23 N McPherson St Sewer Main Replacement Capacity $1,068,000 23 P-15 Dennison Ln Sewer Main Replacement Capacity $526,000 24 P-33 Georgia-Pacific-Haul Rd Sewer Main Replacement Capacity $326,000 25 P-28 S Sanderson Way Sewer Main Replacement Capacity $216,000 26 P-27 Minnesota Ave Sewer Main Replacement Capacity $246,000 27 P-20 E Redwood Ave Sewer Main Replacement Capacity $452,000 28 P-32 Cypress St Sewer Main Replacement Capacity $245,000 29 P-30 Park St Sewer Main Replacement Capacity $91,000 30 P-04 E Oak St Sewer Main Replacement I Capacity $112,000 31 P-08 E Chestnut St Sewer Main Replacement Capacity $359,000 32 P-21 N Harold St Sewer Main Replacement Capacity $279,000 33 P-25 N Whipple St Sewer Main Replacement Capacity $282,000 33 P-14 Cedar St Replacement II Capacity $145,000
35 P-07 N Franklin St Sewer Main Replacement Capacity $286,000 36 P-19 E Pine St Sewer Main Replacement Capacity $971,000 37 P-17 E Fir St Sewer Main Replacement Capacity $1,951,000 38 P-12 S Main St Sewer Main Replacement II Capacity $432,000 39 P-22 N Main St Sewer Main Replacement Capacity $3,605,000 40 P-09 Hazel St Sewer Main Replacement Capacity $230,000 41 P-36 S Main St Sewer Main Extension Build-Out c$647,000 42 R-04 CCTV Condition Inspection Renewal $634,000
43 R-05 6-10 yr CIPP Lining Projects b Renewal $761,000 44 O-02 Capital Plan Update Other $127,000
Capital Plan – Years 6 to 10
5-10 Year Sub-Total : $19,689,000 a Project Costs Escalated for Inflation b Budget reserved for CIPP rehabilitation projects.
Projects to be identified based on condition and
risk, or emergent issues
• Purpose
• Assess the current & future state
• Identify near-term and long-term capital
needs
• Infrastructure – reasonable condition, agerelated structural issues, some infiltration issues, capacity deficiencies, reaching the end of useful
life.
• Increase condition assessment efforts
• Expect efforts to replace or renew aging
infrastructure
• $35M of capital projects over the next 10 years
addressing aging infrastructure, capacity, and City
growth
• Identified and prioritized to mitigate risk and to
maintain current levels of service.
Conclusion & Summary
of Recommendations
Questions
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