Search Frequent Questions

Filter By:

Active filters:

Remove all filters

Displaying 1 - 15 of 18 results

  • 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…

    • Last published:

  • 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…

    • Last published:

  • How long will it take?

    The expectation is for cleaning to take less than one day. The duration will be dependent on the size of the structure and the scope of work.

    • Last published:

  • Do I need to leave my structure during the cleaning?

    While it is strongly recommended that you leave the property during the cleaning, you are not required to do so.

    • Last published:

  • What is EPA’s role?

    EPA will provide oversight of the cleaning.

    • Last published:

  • What about cleaning basements or attics?

    Basements or attics will be considered for cleaning if they are finished and habitable areas.

    • Last published:

  • Will there be photos and videos taken of my property?

    Yes, photos and videos of your property will be taken as a requirement of the program. This is done to ensure that the conditions of the property both pre- and post-cleaning are documented thoroughly.

    • Last published:

  • 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.

    • Last published:

  • 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/ .

    • Last published:

  • Who will conduct the cleaning?

    Cleaning will be performed by workers contracted by Norfolk Southern who are trained and experienced with structure cleaning. Cleaning teams will wear the following: badges, identification clothing, safety vest, shoe covers, gloves (when appropriate for the task), and face coverings (upon request by the property owner or renter).

    • Last published:

  • How can we be assured that this cleaning will remove any persistent hazardous material or substances?

    Based on air monitoring and sampling conducted in and around the community, there is no evidence to suggest there is contamination of concern inside structures.

    • Last published:

  • What are the units of NEI emissions data?

    NEI emissions values represent total annual emissions for the inventory reporting year. Criteria air pollutants and precursors (CAPs) are reported in short tons per year , and hazardous air pollutants (HAPs) are reported in lbs per year .

    • Last published:

  • Products authorized for use on oil discharges

    Does EPA maintain a list of products that are authorized for use on oil discharges? If so, how can a manufacturer have their product included on the list? Section 311(d)(2)(G) of the Clean Water Act (CWA) directs EPA to prepare a schedule of dispersants, other chemicals, and oil spill mitigating…

    • Last published:

  • What will cleaning involve?

    Cleaning will include a top-down approach, starting from the top floor and working down, addressing habitable spaces. Workers will wet-wipe accessible horizontal hard surfaces, wet mop hard floors, vacuum floors, carpets and appropriate soft surfaces, and dry dust appropriate vertical surfaces. Cleaning teams will not move appliances, and cleaning under…

    • Last published:

  • Was there any consideration for cleaning outside structures or conducting additional residential soil sampling?

    Cleaning under this program includes only the inside of structures. Based on soil sampling results from the Phase 1 soil sampling program, additional soil sampling is not necessary. You can find additional information on the EPA website .

    • Last published: