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Oct 12, 2023 39 likes •290 views

NRG Energy Indian River Power NRG Energy Indian River Power Plant Plant Center for the Inland Bays Citizen Advisory Center for the Inland Bays Citizen Advisory Committee Meeting January 17, 2019 Committee Meeting January 17, 2019

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NRG Energy – Indian River Power Plant

Center for the Inland Bays Citizen Advisory Committee Meeting January 17, 2019

NRG Energy – Indian River Power Plant

Center for the Inland Bays Citizen Advisory Committee Meeting January 17, 2019

Alison Kiliszek, Engineer Delaware Department of Natural Resources and Environmental Control Solid and Hazardous Waste Management Section Alison Kiliszek, Engineer Delaware Department of Natural Resources and Environmental Control Solid and Hazardous Waste Management Section

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Phase I (~38 acres) Active 1981 - 2014 Phase II (~26 acres) Active 2010 - present Leachate Accumulation Tanks Southwest Stormwater Basin Northern Stormwater Basin

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Phase I (~38 acres) Active 1981 - 2014 Phase II (~26 acres) Active 2010 - present Geosynthetic Liner System Leachate Collection System Geosynthetic Cap to be installed upon closure Waste fully encapsulated upon final closure Unlined No Leachate Collection System Geosynthetic Cap Installed Top of waste encapsulated

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Federal Coal Combustion Residual (CCR) Rule Federal Coal Combustion Residual (CCR) Rule

 Published in April 2015  Required CCR Landfills/Surface Impoundments to adhere to regulations similar to Municipal Solid Waste Landfills  Required a determination of background and/or statistically significant increases in a number of constituents in groundwater  Published in April 2015  Required CCR Landfills/Surface Impoundments to adhere to regulations similar to Municipal Solid Waste Landfills  Required a determination of background and/or statistically significant increases in a number of constituents in groundwater

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Periodic Monitoring Frequency Periodic Monitoring Frequency

 Groundwater: Semi-Annual in April and October

Quarterly 2015-2017 for Federal CCR Rule

 Surface Water: Semi-Annual in April and October  Stormwater: Twice per year and at least four (4) months apart  Groundwater: Semi-Annual in April and October

Quarterly 2015-2017 for Federal CCR Rule

 Surface Water: Semi-Annual in April and October  Stormwater: Twice per year and at least four (4) months apart

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3 3 1 4 1 1 1 3 1 3 3 1 1 1 1

Surface Water Locations Groundwater Locations

Stormwater Locations

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Monitoring Result Influences Monitoring Result Influences

 Seasonal influences  Tidal influences  Surface Water and Groundwater Interface influences  Seasonal influences  Tidal influences  Surface Water and Groundwater Interface influences

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Monitored Parameters Monitored Parameters

Alkalinity Antimony Arsenic Barium Beryllium Boron Cadmium Calcium Chloride Chromium Cobalt Copper* Fluoride Iron Lead Lithium Magnesium Manganese Mercury Molybdenum pH Potassium Radium 226 & 228 Selenium Sodium Sulfate Thallium TDS TOC

2010 X X X X X X X X X X X X X X X 2011 X X X X X X X X X X X X X X X 2012 X X X X X X X X X X X X X X X 2013 X X X X X X X X X X X X X X X 2014 X X X X X X X X X X X X X X X 2015 X X X X X X X X X X X X X X X X X X X X X X X X X X X X X 2016 X X X X X X X X X X X X X X X X X X X X X X X X X X X X X 2017 X X X X X X X X X X X X X X X X X X X X X X X X X X X X 2018 X X X X X X X X X X X X X X X X

* NOT REQUIRED BY PERMIT OR EPA

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Periodic Monitoring Reporting Periodic Monitoring Reporting

 Groundwater, Surface Water, and Stormwater Monitoring results are reported to the Department within sixty (60) days of sampling event  An updated hydrogeological report is submitted annually  Groundwater Background Report submitted November 2017 for Federal Coal Combustion Residual Rule  Groundwater, Surface Water, and Stormwater Monitoring results are reported to the Department within sixty (60) days of sampling event  An updated hydrogeological report is submitted annually  Groundwater Background Report submitted November 2017 for Federal Coal Combustion Residual Rule

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Plot of Select Parameters Plot of Select Parameters

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0.02 0.04 0.06 0.08 0.1 0.12 0.14 0.16 0.18 0.2 1/1/2010 9/8/2010 5/16/2011 1/21/2012 9/27/2012 6/4/2013 2/9/2014 10/17/2014 6/24/2015 2/29/2016 11/5/2016 7/13/2017 3/20/2018 11/25/2018

Arsenic (mg/L)

MCL Phase I Capped Total Metals

326B 103C 103CR 103A 326C 327A

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0.01 0.02 0.03 0.04 0.05 1/1/2016 3/31/2016 6/29/2016 9/27/2016 12/26/2016 3/26/2017 6/24/2017 9/22/2017 12/21/2017 3/21/2018 6/19/2018 9/17/2018 12/16/2018

Arsenic (mg/L) (focus on 2016 – 2018 data only)

MCL Phase I Capped Total Metals

326B 103C 103CR 103A 326C 327A

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0.001 0.002 0.003 0.004 0.005 0.006 0.007 0.008 0.009 1/1/2010 9/8/2010 5/16/2011 1/21/2012 9/27/2012 6/4/2013 2/9/2014 10/17/2014 6/24/2015 2/29/2016 11/5/2016 7/13/2017 3/20/2018 11/25/2018

Beryllium (mg/L) (CCR Rule only)

MCL Phase I Capped Total Metals

103A 327A

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5 10 15 20 25 30 1/1/2010 9/8/2010 5/16/2011 1/21/2012 9/27/2012 6/4/2013 2/9/2014 10/17/2014 6/24/2015 2/29/2016 11/5/2016 7/13/2017 3/20/2018 11/25/2018

Boron (mg/L) (CCR Rule to present)

Phase I Capped Total Metals

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0.01 0.02 0.03 0.04 0.05 1/1/2010 9/8/2010 5/16/2011 1/21/2012 9/27/2012 6/4/2013 2/9/2014 10/17/2014 6/24/2015 2/29/2016 11/5/2016 7/13/2017 3/20/2018 11/25/2018

Cobalt (mg/L) (CCR Rule only)

Phase I Capped Total Metals

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0.5 1 1.5 2 2.5 3 3.5 4 1/1/2010 9/8/2010 5/16/2011 1/21/2012 9/27/2012 6/4/2013 2/9/2014 10/17/2014 6/24/2015 2/29/2016 11/5/2016 7/13/2017 3/20/2018 11/25/2018

Lithium (mg/L) (CCR Rule only)

Phase I Capped Total Metals

103C 103CR 327C 103B 327B

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0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2 1/1/2010 9/8/2010 5/16/2011 1/21/2012 9/27/2012 6/4/2013 2/9/2014 10/17/2014 6/24/2015 2/29/2016 11/5/2016 7/13/2017 3/20/2018 11/25/2018

Manganese (mg/L)

SDWS Phase I Capped Total Metals

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0.0005 0.001 0.0015 0.002 0.0025 1/1/2010 9/8/2010 5/16/2011 1/21/2012 9/27/2012 6/4/2013 2/9/2014 10/17/2014 6/24/2015 2/29/2016 11/5/2016 7/13/2017 3/20/2018 11/25/2018

Mercury (mg/L) (Analysis Ceased 2018)

MCL Phase I Capped Total Metals

P-1R 2.1 mg/L on 10/10/2013 on AshTracker was Turbidity. 10/10/2013 Mercury value was <0.0005 mg/L

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1 2 3 4 5 6 7 8 9 10 1/1/2010 9/8/2010 5/16/2011 1/21/2012 9/27/2012 6/4/2013 2/9/2014 10/17/2014 6/24/2015 2/29/2016 11/5/2016 7/13/2017 3/20/2018 11/25/2018

Molybdenum (mg/L) (CCR Rule only)

Phase I Capped Total Metals

103C 103CR 327C 103B 327B 326C

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0.05 0.1 0.15 0.2 0.25 0.3 1/1/2010 9/8/2010 5/16/2011 1/21/2012 9/27/2012 6/4/2013 2/9/2014 10/17/2014 6/24/2015 2/29/2016 11/5/2016 7/13/2017 3/20/2018 11/25/2018

Selenium (mg/L)

MCL Phase I Capped Total Metals

103A 326C

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500 1000 1500 2000 1/1/2010 9/8/2010 5/16/2011 1/21/2012 9/27/2012 6/4/2013 2/9/2014 10/17/2014 6/24/2015 2/29/2016 11/5/2016 7/13/2017 3/20/2018 11/25/2018

Sulfate (mg/L)

SDWS Phase I Capped Total Metals

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Compliance History 2010 - present Compliance History 2010 - present

 April 15, 2014 NOV – temporary interior slopes not compliant with operations plan

 RTC January 9, 2014 (compliance achieved prior to NOV being issued)

 December 9, 2014 NOV – failure to conduct hazardous waste determination

 RTC October 29, 2014 (compliance achieved prior to NOV being issued)

 February 15, 2017 LOW – prohibited waste accumulated in Phase II

 RTC March 14, 2017

 April 15, 2014 NOV – temporary interior slopes not compliant with operations plan

 RTC January 9, 2014 (compliance achieved prior to NOV being issued)

 December 9, 2014 NOV – failure to conduct hazardous waste determination

 RTC October 29, 2014 (compliance achieved prior to NOV being issued)

 February 15, 2017 LOW – prohibited waste accumulated in Phase II

 RTC March 14, 2017

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Looking Toward the Future… Looking Toward the Future…

 Rising sea level has the potential to impact the landfill units

 Seasonal influences  Tidal influences  Surface Water and Groundwater Interface influences

 Monitoring is expected to occur until the end of the Post-Closure Care period  Rising sea level has the potential to impact the landfill units

 Seasonal influences  Tidal influences  Surface Water and Groundwater Interface influences

 Monitoring is expected to occur until the end of the Post-Closure Care period

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Jason.Sunde@state.de.us Jason.Sunde@state.de.us Alison.Kiliszek@state.de.us