CCR Rule and ELG Compliance Data and Information

What are Coal Combustion Residuals (CCR)?

Coal combustion residuals are the materials that remain after pulverized coal is burned to generate electricity. There are several different types of materials produced including:

Fly Ash – a very fine, powdery material which “flies” up into the stack with flue gases and is removed by electrostatic precipitators;

Bottom Ash and Boiler Slag – coarse particles that are too large to be carried up into the stack, so they settle to the bottom of the combustion chamber;

Flue Gas Desulfurization Material (FGD) – a material leftover from the process of reducing sulfur dioxide emissions from a coal-fired boiler.

These materials have a wide range of beneficial uses in the construction, manufacturing, environmental remediation and other industries. Those not initially recycled for beneficial use are placed in the IDNR permitted CCR landfill.

Location Restrictions

• Unstable Area Determination – Certified Unstable Area Determination

Operating Criteria

• CCR Fugitive Dust Control Plan (Most Recent)
• CCR Fugitive Dust Control Annual Report – 2023 | 2022 | 2021 | 2020 | 2019
• Initial/Periodic Run-on and Run-off Control System Plans –  2021 
• Qualified Professional Engineer (QPE) Annual Inspection Report for CCR Landfill – 2022 | 2021 | 2020 | 2019 | 2018
• Documentation of Corrective Measures Resulting From QPE Annual Inspection of Landfill – (Not yet required)
• Certified Unstable Area Determination

Groundwater Monitoring and Corrective Action

• Annual Groundwater Monitoring and Corrective Action Report – 2022 | 2021 | 2020 | 2019 | 2018
• Groundwater Monitoring System Certification – | 2016
• Selection of Statistical Method Certification – | 2016
• Ground Water Protection Standards and Statistical Analysis of Assessment Data
  • June 2018 Assessment
  • August 2018 Assessment 

Closure and Post-Closure Care

• Written Closure Plan & Post-Closure Plan – | 2016 |

On May 9, 2024, the U.S. Environmental Protection Agency (EPA) published the final rule to revise the Steam Electric Power Generating Point Source Category Effluent Limitations Guidelines (2024 ELG Rule).

Muscatine Power and Water (MPW) is currently assessing compliance options and the best economically achievable technologies for each generating unit affected by the 2024 ELG Rule. This evaluation aims to meet discharge limitations and compliance deadlines. MPW will choose the optimal pathway for each unit or facility to ensure compliance while maintaining the delivery of clean, safe, reliable, and affordable electricity. Additionally, we remain committed to protecting downstream water quality and safeguarding the people and wildlife that depend on the state’s water bodies.

See additional details from MPW or visit the Environmental Protection Agency’s website for full governmental details.

MPW has one facility with three generating units subject to the ELG rule and applicable regulatory submittals are provided below.