Former Potrero Power Plant Site Remediation WELCOME. PG&E Community Open House

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1 WELCOME PG&E Community Open House

2 Former Potrero Power Plant Site Remediation Former Potrero Power Plant Site Header 1 This is paragraph style 1 Photo taken: March 2012.

3 What is a Manufactured Gas Plant (MGP)? MANUFACTURING PROCESS GAS HOLDER COAL OR OIL GAS RESIDENCES STREET LAMPS BUSINESSES

4 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.

5 Former Potrero Power Plant Site Remediation Project Site Hoe Down Yard (Cleanup Complete) Port Property 22ND ST. (Cleanup Plan Approved / In Design) Switchyard/ Construction Yard OFFSHORE SEDIMENT AREA (Cleanup Approach Approved Tank Farm (Cleanup Complete) (Investigation Pending Tank Removal by NRG) ILLINOIS ST. 3RD ST.. T E N N E SS E E S T Station A (NRG Owned) (Anticipated 2016 Closure / Completion) Station A (PG&E Owned) Northeast Area / Cleanup Plan Pending) (Cleanup Plan Approved / In Design) Former Power Generation Facility (Investigation Completed) (Anticipated 2016 Closure / Completion) 23RD ST. PG&E-Owned Properties Approximate boundaries shown. Map not to scale. NRG Potrero, LLC Owned Properties Port of San Francisco Property Impacted by Historical MGP Activities

6 Cleanup Timeline OFFSHORE SEDIMENT AREA Cleanup Plan Development Public Comment Period Design / Permitting Cleanup Plan Completion Contracting and Construction Permitting Construction and Field Work Regulatory Closure NORTHEAST AREA (INCLUDING PORT PROPERTY) Design/Permitting Contracting and Construction Permitting Construction and Field Work Regulatory Closure NRG Potrero, LLC Owned Properties FMR POWER GENERATION FACILITY (UNIT 3) TANK FARM Investigation and Risk Assessment Public Review and Regulatory Closure Timeline Under Development STATION A Regulatory Closure STATION A Regulatory Closure PG&E Owned Properties HOE DOWN YARD Cleanup Completed in SWITCHYARD Cleanup Completed in 2012.

7 Former Potrero Power Plant Site Remediation Offshore Sediment Area 1 2 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 N OFFSHORE SEDIMENT AREA Port Property Tank Farm Northeast Area 3 Station A Former Power Generation Facility Northern Transition Area In-place treatment with activated carbon Southern Transition Area Monitored natural recovery NRG Potrero, LLC Owned Properties Next Steps Cleanup Plan review by Water Board: Fall 2016 Public Comment Period /Public Meeting: Late-2016 View of Offshore Sediment Area Port of San Francisco Property Impacted by Historical MGP Activities Shoreline and Nearshore Areas Where Impacts Will be Addressed Transition Areas Where Impacts Will be Addressed

8 Former Potrero Power Plant Site Remediation Northeast Area Cleanup Cleanup Plan approval: Summer 2016 Cleanup Plan: 1 Port Property 2 Tank Farm 1 A portion of MGP residues around Pier 70 structures excavated 2 A portion of MGP residues on Power Plant Property treated in-place using cement mix (solidification) 3 Northeast Area 2 Durable cover installed/maintained Active cleanup: 2017/2018 Community Meeting before work starts 3 Station A NRG Potrero, LLC Owned Properties Port of San Francisco Property Impacted by Historical MGP Activities Former Power Generation Facility Excavation Area Solidification Area

9 Former Power Generation Facility and Tank Farm 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 Tank Farm (NRG owned) Includes three large above-ground fuel tanks formerly used to store fuel oil Investigation pending tank removal by NRG