Update PUBLIC WORKSHOP San Pedro Doubletree Hotel September 19, - PowerPoint PPT Presentation

Update PUBLIC WORKSHOP San Pedro Doubletree Hotel September 19, 2017

Previous Clearwater Outreach Over 500 Meetings

Collect and treat sewage from 5.6 million people GOVERNANCE 24 special districts with one staff SERVICE AREA 78 cities & unincorporated county Sanitation Districts 824 square miles INFRASTRUCTURE of 1,400 miles of sewers Los Angeles County 11 wastewater treatment plants Ocean outfall system

Joint Outfall System Main sewer system serving over Tunnel & 5 million people. Outfall System

Existing Tunnels & Outfalls Outfalls Royal Palms Beach Palos Verdes Peninsula San Pedro 8-ft Tunnel 12-ft Tunnel (1937) (1958) 8-ft Tunnel Joint Water Pollution Control Plant (Carson) 12-ft Tunnel

Consequences of Tunnel Failure Los Angeles Harbor Machado Lake Joint Water Pollution Control Plant (Carson) Wilmington Drain

Consequences of Tunnel Failure Los Angeles Harbor Machado Upstream Lake Sewage Diverted To Channel Joint Water Pollution Control Plant (Carson) Wilmington Drain

NEW TUNNEL Essential for System Reliability NEW TUNNEL 2018-2025 • $700 million • 18-feet diameter • 7 miles long • Depths of 30 to 450 feet below surface to 2020-2024 top of tunnel • Mostly under public roadways • 7 years to construct (2018-2025) 2023-2025

Construction at JWPCP (2018-2025) ENTRY SHAFT Joint Water Pollution Control Plant

Tunnel Depth Profile White Carson Point Palos Verdes Peninsula 70 FT 65 FT 460 FT 50 FT 30 FT Deep

Work at Royal Palms Beach (2023-2025) CRANE VISUAL/SOUND BARRIER WORK ON NEW TUNNEL About 2 Years

Tunnel Boring Machine (TBM)

Sophisticated Controls Control Room

Tunneling in Soil VIBRATION (TRUCK DRIVING ON STREET) Noticeable Just Perceptible NEAREST HOMES/BUSINESSES 50 feet away Barely Perceptible Threshold of Perception Not Felt

Monitoring Program TYPE MONITORS Ground Monitoring Points Settlement near surface Inclinometers Lateral ground movement AT OR NEAR SURFACE Vibration Monitors Vibration Displacement Monitoring Points Movement TYPE MONITORS UTILITY LINES Utility Monitoring Points Any movement of utility lines TYPE MONITORS UNDERGROUND Multiple Position Extensometers Settlement at different depths Vibrating Wire Piezometers Changes in groundwater levels TUNNELING MACHINE

Project Timeline CEQA/NEPA TUNNELING Completed WORK STARTS WORK ENDS AT JWPCP AT JWPCP 2017 2021 2024 2012 2018 2019 2020 2022 2023 2025 Final Design Completed WORK AT & ROYAL PALMS BEACH Permits Obtained

Q & A