Los angeles county prioritization of sewer rehabilitation projects
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LOS ANGELES COUNTY PRIORITIZATION OF SEWER REHABILITATION PROJECTS PowerPoint PPT Presentation


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LOS ANGELES COUNTY PRIORITIZATION OF SEWER REHABILITATION PROJECTS. Fernando Villaluna, P.E. Paper #. Overview. Los Angeles County Sanitary Sewer System Condition Assessment Program Program Methodology Program Results Questions. Paper #. LOS ANGELES COUNTY Wastewater System Overview.

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LOS ANGELES COUNTY PRIORITIZATION OF SEWER REHABILITATION PROJECTS

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Los angeles county prioritization of sewer rehabilitation projects

LOS ANGELES COUNTYPRIORITIZATION OF SEWER REHABILITATION PROJECTS

Fernando Villaluna, P.E.

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Overview

Overview

Los Angeles County Sanitary Sewer System

Condition Assessment Program

Program Methodology

Program Results

Questions

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Los angeles county wastewater system overview

LOS ANGELES COUNTYWastewater System Overview

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System overview los angeles county consolidated sewer maintenance district district

SYSTEM OVERVIEWLos Angeles County Consolidated Sewer Maintenance District (District)

  • Comprises of

    • 38 contract cities

    • unincorporated communities

  • Serves over 2.5 million people

  • Collection System

    • 4,600 miles of gravity sewer lines

    • Over 90% 8” VCP

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Sanitary sewer condition assessment program

Sanitary Sewer Condition Assessment Program

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Los angeles county prioritization of sewer rehabilitation projects

GOAL

To reduce the number of Sanitary Sewer Overflows

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Program objectives

Program Objectives

Conduct Closed-Circuit Television (CCTV) inspection

Identify maintenance issues

Determine structural intregrity

Analyze data for benchmarking

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Program methodology

Program Methodology

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Program cycle

Program Cycle

Continuously repeating cycle

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Inspection process

Inspection Process

Light Cleaning vs. Complete Cleaning

CCTV Inspection

Data Collection

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Data review

Data Review

Conducted by in-house Engineering Staff

Verify upon receipt of data

All segments were inspected

Inspections were conducted using PACP

Data is properly formatted

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Reports

Reports

Provide a summary of overall health and condition of system

Include maps and tables

Highlight maintenance and structural issues

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What to repair or maintain

What to repair or maintain?

Utilize PACP Ratings

Structural and Maintenance

Prioritize the highest rated segments

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Maintenance ratings

PACP Rating Descriptions

Maintenance Ratings

Due to continued deterioration, MAINTENANCE issues with a Grade 3 may be a problem in the next 10 years

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Maintenance summary

Maintenance Summary

18.80%

10.12%

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Public education

Public Education

Lateral connections with excessive roots, grease or other defects

Homeowners are notified to

maintain their connections

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Structural ratings

PACP Rating Descriptions

Structural Ratings

Segments with STRUCTURAL Grades of 4 and 5 will most likely be an issue in the next 10 years

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Structural summary

Structural Summary

6.07%

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Rehabilitation budget

Rehabilitation Budget

Annual fee of $5/sewage unit

District rehabilitation budget: $3.81 million

Design, advertising, project management, construction

Emergency Sewer Repair Program

$950,000/year for as-needed emergency contractor repairs

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Prioritizing repairs

Prioritizing Repairs

Emergency / Immediate Repairs

Collapsed / blocked pipe

Defect at invert / evidence of voids around defects

Near watercourse or public facility

High volume of flow / high risk

Capital Improvement Repairs

Breaks / fractures above the flow line

Partially obstructed flow

Easement / local street location

Moderate volume of flow

Monitor defects

Cracks / minor fractures

Unobstructed flow

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Emergency repairs

Emergency Repairs

Traditional open-trench repairs (typical)

Time and Materials

Costs range $12k – $25k

Construction 3-5 days

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Repairs by district forces

Repairs by District Forces

Low risk of collapse

Scheduled repair

Residential / local streets or easements

Approximate cost: $10k

Completed between 2-3 days

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Trenchless lining projects

Trenchless Lining Projects

Moderate deficiencies

Multiple breaks / fractures along sewer pipe

Minimum obstacles along pipe from manhole to manhole

Approximate construction cost: $22/foot

Completed between 6-8 hours

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Pipe bursting

Pipe Bursting

Replacement of 83-year old concrete sewer

Deterioration from age and H2S exposure

Limited access due to easement location and overbuild

One hour for pipe bursting

Two weeks prior to expose lateral connections

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R esults

RESULTS

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Results

Results

Inspected over 3,000 miles of sewers to date

Produced over 3,500 maintenance work orders

Completed 65 Emergency Structural Repairs

District Crews completed over 50 repairs

Rehabilitated 120 miles of concrete pipes

Lined over 21 miles of pipe from CCTV projects

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Reduction in overflows

Reduction in Overflows

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Benefits realized

Benefits Realized

Enhanced service to the community

Lessen impact on public health, safety and the environment

Reductions in

Emergency overtime

Service requests

Claims

Increased productivity

Increased life expectancy of our collection system

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Questions

QUESTIONS?

Contact Information:

Fernando Villaluna, P.E.

[email protected]

(626) 300-3380

OR VISIT US ONLINE:

WWW. DPW.LACOUNTY.GOV/SMD/SMD/

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