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Former Potrero Power Plant Site Remediation
WELCOMEPG&E Community Open House
Former Potrero Power Plant Site Remediation
Former Potrero Power Plant Site
Photo taken: March 2012.
Former Potrero Power Plant Site Remediation
GA
S
RESIDENCES
STREET LAMPS
BUSINESSES
MANUFACTURINGPROCESS
GAS HOLDER
COAL OR OIL
What is a Manufactured Gas Plant (MGP)?
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.
Former Potrero Power Plant Site Remediation
1870 1920 19701880 1930 19801890 1940 19901900 1950 20001910 1960 20152010
Timeline-Operations
1999PG&E sells Potrero Power Plant to Southern Company.
1870s–1930sAn MGP operated on Potrero Property.
1910s–1999PG&E operates Potrero Power Plant.
PG&E
March 2011Potrero Power Plant shuts down.
NRG
1999–PresentSouthern Co. (subsequently, Mirant Corp., then GenOn and now NRG Potrero, LLC) owns Potrero Power Plant.
2007–2010Trans Bay Cable Project completed.
Former Potrero Power Plant Site Remediation
Northeast Area Design/Implementation Timeline2011 2012 2013 2014 2015 2016 2017 2018
August 2011 – November 2012Feasibility Study Process
February 2016– November 2016Engineering Design
February 2015 – February 2017Permitting
February 2017 – January 2018Construction and Field Work
September 2012 – September 2013Pre-Design Investigation
May 2014–June 2014Solidification Pilot Test
June 2014–June 2015Remedial Action Plan Development
Former Potrero Power Plant Site Remediation
Project Site
Approximate boundaries shown. Map not to scale.
23RD ST.
22ND ST.
ILLINO
IS ST.
3RD
ST.
TEN
NE
SSEE
ST.
OFFSHORE SEDIMENT AREA
280
PG&E-Owned Properties NRG Potrero, LLC Owned Properties Port of San Francisco Property Impacted by Historical MGP Activities
N
Port Property
Station A
Tank Farm
Switchyard/Construction Yard Northeast
Area
Hoe Down Yard
Former Power Generation Facility
Approx. 500 ft.
Former Potrero Power Plant Site Remediation
Station A
Tank Farm
Former Power Generation Facility
Approved Cleanup Approach: Solidification with Limited Excavation
For illustrative purposes only. Approximate boundaries shown. Images not to scale.
NortheastArea
Port Property
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 to be installed
Estimated time to complete: Approximately one year
NRG Potrero, LLC Owned Properties Excavation Area
Port of San Francisco Property Impacted by Historical MGP Activities Solidification Area
1
2
2
1
2
Former Potrero Power Plant Site Remediation
Port Property
Station A
Tank FarmNortheastArea
Former Power Generation Facility
Solidification Pilot Test: May – June 2014
For illustrative purposes only. Approximate boundaries shown. Images not to scale.
Pilot Test will:
• Refine solidification treatment approach on a small scale
• Take approximately two months to complete
• Make use of large-scale equipment
NRG Potrero, LLC Owned Properties
Pilot Test Solidification Area
Port of San Francisco Property Impacted by Historical MGP Activities
TEST AREA
TEST AREA
Former Potrero Power Plant Site Remediation
Solidification Process/Equipment
DRILL RIG /CRANE
DR
ILL
/MIX
ERCEMENT MIX
PREPARATION
SOLIDIFIED / TREATED SOILS
Images not to scale. For illustrative purposes only.
1 Solidification mix will be injected into the ground.
2 The mix will solidify impacted soils in place
Former Potrero Power Plant Site Remediation
Title of Station
AIR MONITORING• Perimeter air monitoring—upwind and downwind of work areas • Personal air monitors for workers
ODOR CONTROL• Odor-suppressing foam • Soil cover
SOIL MANAGEMENT / DUST CONTROL• Excavated soil stored in covered containers • Covered trucks • Truck tire washing stations, pavement sweeping and soil wetting
TRUCK / EQUIPMENT TRAFFIC• Limited removal of soil and debris • Average of 2-3 truck trips per day for various purposes
Safety Measures
Images for illustrative purposes only