Former Potrero Power Plant Site Remediation WELCOME PG&E Community Open House
Former Potrero Power Plant Site Remediation Former Potrero Power Plant Site Header 1 This is paragraph style 1 Photo taken: March 2012.
Former Potrero Power Plant Site Remediation Project Site N Hoe Down Yard 280 OFFSHORE Port SEDIMENT Property 22ND ST. AREA Switchyard/ Construction Yard Northeast Tank Farm Area 3 I T L R E L D N I N N S O E T I . S S S S E Station A T E . Former (NRG Owned) S T Power . Generation Station A Facility (PG&E Owned) 23RD ST. Port of San Francisco Property Impacted PG&E-Owned Properties NRG Potrero, LLC Owned Properties by Historical MGP Activities Approximate boundaries shown. Map not to scale.
Former Potrero Power Plant Site Remediation What is a Manufactured Gas Plant (MGP)? MANUFACTURING GAS HOLDER PROCESS COAL OR OIL GAS RESIDENCES STREET LAMPS BUSINESSES
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 Timeline-Operations 1870 1880 1890 1900 1910 1920 1930 1940 1950 1960 1970 1980 1990 2000 2010 2015 1870s–1930s An MGP operated on Potrero Property. 1910s–1999 PG&E operates Potrero Power Plant. 1999 PG&E sells Potrero Power Plant to Southern Company. PG&E NRG 1999–Present Southern Co. (subsequently, Mirant Corp., then GenOn and now NRG Potrero, LLC) owns Potrero Power Plant. March 2011 Potrero Power Plant shuts down. 2007–2010 Trans Bay Cable Project completed.
Former Potrero Power Plant Site Remediation Timeline-Sediment Remediation 5 0 0 5 0 1 1 2 6 7 8 9 2 3 4 6 8 9 1 7 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 2 2 2 2 0 0 0 0 0 0 0 0 0 0 0 0 2 2 2 2 2 2 2 2 2 2 2 2 1990–2013 Environmental Investigations. Site Wide Soil and Groundwater Sampling. 2009–2013 Offshore Sediment Remedial Investigations and Survey 2014–2015 Offshore Sediment Feasibility Study Process (including public participation) 2015–2016 Offshore Sediment Remedial Action Plan Process (including public participation) 2016–2017 Offshore Sediment Cleanup Design 2016–2017 Offshore Sediment Permitting 2018 Offshore Sediment Construction and Field Work
Former Potrero Power Plant Site Remediation Offshore Sediment Draft Feasibility Study • Draft Feasibility Study (FS) N evaluates cleanup options for impacted sediments and identifjes a preferred approach • Draft FS submitted to SF Regional Water Quality Control Board (Water Port Board) for review and public comment Property OFFSHORE • Public comment period scheduled SEDIMENT Northeast AREA Tank Farm for May/June 2015 (pending Water Area Board approval) • Public outreach Former Station A • Public Comment Period Power Generation Facility • Fact Sheet NRG Potrero, Port of San Francisco Property Impacted LLC Owned Properties by Historical MGP Activities For illustrative purposes only. Approximate boundaries shown. Image not to scale.
Former Potrero Power Plant Site Remediation Preferred Option: Sediment Removal, Capping, In-Place Treatment and Natural Recovery Targeted cleanup methods will address varying conditions throughout the N Offshore Sediment Area: • Removal of impacted sediments and capping with natural materials (Nearshore Area) OFFSHORE Port SEDIMENT Property AREA • In-place treatment with activated carbon Northeast (Northern Transition Area) Tank Farm Area • Monitored natural recovery Station A (Southern Transition Area) Former Power Generation • Estimated time to complete: Facility • Design, permitting and contracting: Approximately 2 years Areas of Benthic Port of San Francisco Shoreline and • Construction: Approximately 6-8 NRG Potrero, Organism Property Impacted Nearshore Areas LLC Owned Bioaccumulation by Historical MGP Where Impacts Will Properties Above Ambient Activities be Addressed months Conditions
Former Potrero Power Plant Site Remediation A Typical 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 fjsh and some birds • The presence of an abundant and diverse benthic community is one sign of a healthy marine ecosystem Healthy Benthic Community Water Oxidized Sediment For illustrative purposes only. Image not to scale.
Former Potrero Power Plant Site Remediation Benefjts of Preferred Option • Long-term effectiveness and permanence • Minimizes impact to healthy, diverse marine ecosystem in Offshore Sediment Area • Addresses surface sediments with elevated concentrations of impacts along the shoreline Crews collect samples from Offshore Sediment Area during 2012 investigation effort. Preferred cleanup option addresses impacted sediments in the Offshore Area.
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