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Former Potrero Power Plant Site Remediation

WELCOME PG&E Community Open House


ILLINO

IS ST.

Project Site

Hoe Down Yard CLEANUP COMPLETE

Switchyard/ Construction Yard CLEANUP COMPLETE

Tank Farm INVESTIGTATION

IN PROGRESS

Station A CLEANUP COMPLETE

N

Port Property

CLEANUP BEGINNING SUMMER 2018 OFFSHORE

SEDIMENT AREA

Northeast CLEANUP PLAN Area APPROVED

CLEANUP IN PROGRESS

Unit 3 Power Block Area

INVESTIGATION APPROVED

Port of San Francisco Property Offshore Sediment Area (SF Bay) PG&E Owned Properties Associate Capital Owned Properties Impacted by Historical MGP Activities

For illustrative purposes only. Approximate boundaries shown. Map not to scale.


Port Property

Station A

Tank Farm Northeast Area

Unit 3 Power Block

2

1

1

3

Associate Capital Owned Properties

Port of San Francisco Property Impacted by Historical MGP Activities

Solidification Area

Excavation Area

Northeast Area Cleanup

CLEANUP ACTIVITIES

• MGP residues on former Power Plant Property 1

are deeper and are being treated in-place

• Soil with MGP residues on Port Property are 2

shallower and will be excavated out

• A durable cover will be installed/restored 3

over the entire area

ANTICIPATED SCHEDULE

• In-place treatment: 1

July 2017 – October 2018

• Soil excavation: 2

July 2018 – November 2018

• Site restoration: 3

November 2018 – December 2018

WORK HOURS

• Monday – Friday, 7:00 AM – 6:00 PM (limited weekend and evening work, if needed)

Approximate boundaries shown. Map not to scale.


DRILL RIG / CRANE D

RIL

L / M

IXER

CEMENT MIX

PREPARATION

SOLIDIFIED / TREATED SOILS

Solidification Process/Equipment

1 Solidifcation mix will be injected into the ground.

2 The mix will solidify impacted soils in place

Images not to scale. For illustrative purposes only.


Northeast Area Cleanup: Trucking

• All efforts will be made to minimize the impact of truck traffc:

° Tires cleaned before leaving Site

° Trucks loads covered and contained for transport

° Use of approved truck routes avoiding residential neighborhoods

° Engine idling will be limited

20th St

23rd St

Cesar Chavez St

Cargo Way

Illin

ois

St

Illin

ois

St

Primary Truck Route to Highway 101 and 280

Secondary Truck Route to Highways

Truck Route to Railyard

TRUCK ROUTES


Offshore Sediment Cleanup (including early action)

CLEANUP ACTIVITIES

• Nearshore Area: Removal of impacted sediments and capping with natural materials

• Northern Transition Area: In-place treatment with activated carbon

• Southern Transition Area: Monitored natural recovery

• Early action: Targeted removal of wooden pilings along shoreline

ANTICIPATED SCHEDULE

• Early action: June-November 2018

• Cleanup construction: Between Summer and Fall 2019

Port Property

Station A

Tank FarmNortheastArea

Unit 3 Power Block

N

OFFSHORE SEDIMENT AREA

Associate Capital 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


A Healthy Marine Ecosystem

• Benthic organisms include a variety of invertebrates that live on or in underwater sediments

• They serve as an important food source for bottom-feeding fsh and some birds

• The presence of an abundant and diverse benthic community is one sign of a healthy marine ecosystem

Water

Healthy Benthic Community

Oxidized Sediment

For illustrative purposes only. Image not to scale.


Unit 3 Power Block

• Soil and groundwater investigations approved by Water Board in 2017

• Closure Plan/Final Remedy, including land use controls, in development

NEXT STEPS

• Summer 2018: Public review of Final Remedy

° 30-day comment period

° Fact sheet

• Fall/Winter 2018: Final Remedy approval / anticipated closure

pg&e community open house · pg&e community open house . former potrero power plant site...

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