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Displaying 1 - 15 of 25 results
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How do the different parts of particulate matter (PM) fit together?
The various parts of PM in the NEI are related as follows. PM10-FIL > PM25-FIL because PM10-FIL includes PM25-FIL PM25-PRI = PM25-FIL + PM-CON This equation only applies at the process level. Because some sources only can report PM2.5 (due to test method differences), this equation does not apply to…
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How does PM2.5 relate to PM species such as EC, OC, SO4, NO3, PMFINE, and DIESEL-PM25?
Primary PM2.5 estimates are speciated into the five PM species in the NEI: elemental (black) carbon (EC), organic carbon (OC), nitrate (NO3), sulfate (SO4), and the remainder of PM25-PRI (PMFINE). Diesel engine PM25-PRI and PM10 emissions are also labeled as DIESEL-PM25 and DIESEL-PM10 for mobile source diesel engines. For all…
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Do settlement communications, such as past “agreements in principle,” impact the implementation of the final Consent Decrees?
The parties are bound by the terms of the various final, publicly available consent decrees. These consent decrees were made available for public comment before they were finalized and entered by the Court. Past settlement communications and documents created in the course of settlement discussions have been incorporated (or not)…
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What is the Confidentiality Order?
The Confidentiality Order (Order) is a court order entered by the Federal District Court for the District of Montana (Court) on August 8, 2002, and amended by the Court on December 31, 2003, that applies to Superfund settlement negotiations in the Clark Fork River Basin, including the following sites: Silver…
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How does EPA ensure that the potentially responsible parties complete their work?
All cleanup activities performed by the PRPs are subject to enforcement instruments (i.e., consent decrees or administrative orders) that provide for EPA approval of all deliverables and oversight of all work performed by the PRPs.
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Can you explain who has authority over the active mine vs the Superfund site?
The Montana Department of Environmental Quality has regulatory authority over the active mine. EPA is the lead agency for the Silver Bow Creek/Butte Area Superfund Site and works in consultation with MDEQ to ensure the cleanup of the Site.
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Where can I go to learn more?
PitWatch.org is the online home of the Berkeley Pit Public Education Committee. This volunteer committee educates residents, students, and the public about the environmental management of the Berkeley Pit. Information includes the geology, hydrology, current events, and ongoing academic research associated with the Berkeley Pit. This committee frequently shares their…
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When will construction begin in the Silver-Bow Creek Corridor?
Construction in the Silver Bow Creek corridor began in 2024 with the Grove Gulch Project.
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Why is the Confidentiality Order important?
The Confidentiality Order (Order) has been, and continues to be, effective in assisting the parties in reaching settlements under the framework established by the Court in US v. ARCO and still pending in court – six consent decrees to date have been entered since the Order was issued. There are…
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What is included in the emissions “Tiers”?
The Tiers are assigned by a Source Classification Code (SCC), which has the most detail about the emissions processes that generate the emissions. The full list of SCCs, their associated Tiers, and the SCC descriptions is available online at https://ofmpub.epa.gov/sccwebservices/sccsearch/ .
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If I certify a nonroad flexible-fuel engine under 40 CFR Part 1054, are owners and operators prohibited from using gasoline-ethanol blended fuels containing greater than 10 volume percent ethanol under 80.1504(a)(1) in my nonroad flexible-fuel engine?
See More Frequent Questions about Fuels Registration, Reporting, and Compliance Help . No, owners and operators of nonroad engines, vehicles, and equipment where the nonroad engine is certified under 40 CFR Part 1054 as a flexible-fuel engine are not prohibited from using gasoline-ethanol blended fuels containing greater than 10 volume…
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Why were the consent decree negotiations under a confidentiality order?
The confidentiality order was issued by the federal district court in 2002 to encourage and facilitate settlement negotiations. The court determined that the confidentially order was appropriate to ensure that the parties were afforded the opportunity to engage in frank, open discussion so that litigation could be settled promptly and…
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What does an annual emissions value in the NEI represent (one year or multiple years)?
The NEI provides total annual emissions for a single year.
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What projects has EPA been involved with in Butte related to the Superfund site?
A variety of actions and activities have been implemented to address the contamination in Butte, including: Assessments of risk have been conducted to quantify actual and potential human health risks due to potential exposure to tailings, waste rock, yard soils, indoor dust, attic dust, mercury vapor, surface water, and ground…
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How will waste from the Further Remedial Elements project (Silver Bow Creek Corridor) areas be handled?
Each Further Remedial Element project area has its own specific requirements regarding waste. For example, at Northside Tailings and Diggings East, all materials within the project area that exceed the Waste Identification Criteria will be disposed of offsite in a repository. At Buffalo Gulch all materials below the basin(s) that…
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