WELCOME PG&E Community Open House Former Potrero Power Plant - - PowerPoint PPT Presentation

Former Potrero Power Plant Site Remediation

WELCOME

PG&E Community Open House

Former Potrero Power Plant Site Remediation

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Former Potrero Power Plant Site

Photo taken: March 2012.

Former Potrero Power Plant Site Remediation

What is a Manufactured Gas Plant (MGP)?

GAS RESIDENCES STREET LAMPS BUSINESSES

MANUFACTURING PROCESS

GAS HOLDER

COAL OR OIL

Former Potrero Power Plant Site Remediation

Goals

Fulfill our commitment to address impacts from historic MGP and power plant operations. Protect human health and the environment. Work collaboratively with stakeholders and the community. Protect the safety of the community and site workers. Allow for the productive re-use of the site.

Approximate boundaries shown. Map not to scale.

PG&E-Owned Properties NRG Potrero, LLC Owned Properties Port of San Francisco Property Impacted by Historical MGP Activities

2 3 R D S T . 2 2 N D S T . ILLINOIS ST. 3RD ST. TENNESSEE ST. OFFSHORE SEDIMENT AREA

(Cleanup Approach Approved / Cleanup Plan Pending)

Port Property

(Cleanup Plan Approved / In Design)

Station A (NRG Owned)

(Anticipated 2016 Closure / Completion)

Station A (PG&E Owned)

(Anticipated 2016 Closure / Completion)

Tank Farm

(Investigation Pending Tank Removal by NRG)

Northeast Area

(Cleanup Plan Approved / In Design)

Hoe Down Yard

(Cleanup Complete)

Former Power Generation Facility

(Investigation Completed)

Former Potrero Power Plant Site Remediation

Project Site

Switchyard/ Construction Yard

(Cleanup Complete)

2016 2017 2018 2019

NRG Potrero, LLC Owned Properties PG&E Owned Properties

Regulatory Closure Cleanup Plan Completion Public Comment Period Cleanup Plan Development Construction and Field Work Regulatory Closure Design / Permitting Contracting and Construction Permitting Timeline Under Development Design/Permitting Investigation and Risk Assessment Public Review and Regulatory Closure Regulatory Closure Construction and Field Work Regulatory Closure Cleanup Completed in 2012. Cleanup Completed in 2012. Contracting and Construction Permitting TANK FARM STATION A FMR POWER GENERATION FACILITY (UNIT 3) NORTHEAST AREA

(INCLUDING PORT PROPERTY)

OFFSHORE SEDIMENT AREA STATION A HOE DOWN YARD SWITCHYARD

Former Potrero Power Plant Site Remediation

Cleanup Timeline

■ Feasibility Study (FS) of Cleanup

Approach approved in 2015

■ Approved Cleanup Approach

addresses different conditions:

Nearshore Area Dredging of impacted sediments and capping with natural materials Northern Transition Area In-place treatment with activated carbon Southern Transition Area Monitored natural recovery

■ Next Steps

• Cleanup Plan review by Water Board: Fall 2016
• Public Comment Period /Public Meeting: Late-2016

View of Offshore Sediment Area

1 2 3

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Port Property Station A Tank Farm Northeast Area Former Power Generation Facility

OFFSHORE SEDIMENT AREA

1 2 3

NRG Potrero, LLC Owned Properties Port of San Francisco Property Impacted by Historical MGP Activities Transition Areas Where Impacts Will be Addressed Shoreline and Nearshore Areas Where Impacts Will be Addressed

Former Potrero Power Plant Site Remediation

Offshore Sediment Area

■ Cleanup Plan approval: Summer 2016 ■ Cleanup Plan:

• A portion of MGP residues around

Pier 70 structures excavated

• A portion of MGP residues on Power Plant Property

treated in-place using cement mix (solidification) Durable cover installed/maintained

■ Active cleanup: 2017/2018 ■ Community Meeting before work starts

Port Property Station A Tank Farm Northeast Area Former Power Generation Facility

3

1 2 3

1 2 2

NRG Potrero, LLC Owned Properties Port of San Francisco Property Impacted by Historical MGP Activities Solidification Area Excavation Area

Former Potrero Power Plant Site Remediation

Northeast Area Cleanup

Tank Farm (NRG owned)

• Includes three large above-ground fuel tanks formerly

used to store fuel oil

• Investigation pending tank removal by NRG

Former Power Generation Facility (NRG owned)

• Includes the Unit 3 power plant and surrounding areas
• Soil and groundwater investigations complete
• PG&E, NRG and Water Board working to evaluate

results and plan for closure

Former Potrero Power Plant Site Remediation

Former Power Generation Facility and Tank Farm