Demolition Archive

Perimeter Air Monitoring Plan

During decommissioning and demolition activities at the Science, Technology & Advanced Research Campus, air conditions at the perimeter of the redevelopment area will be monitored by 1743 Holdings, LLC ‘s environmental consultant, BrightFields, Inc. of Wilmington, Delaware. The primary three goals of this perimeter air monitoring plan are to: (1) ensure that the engineering controls and work practices being utilized by URS and its subcontractors during decommissioning and demolition activities will prevent exposure to surrounding residents, businesses and passersby to air contaminants that may potentially be released; (2) serve as a third-party, independent verification of the dust monitoring plan that is being conducted by URS during the course of the demolition project; and (3) check for and document off-site activities that may generate dusts that can impact or cause elevated monitoring results that are unrelated to the site decommissioning and demolition activities. Work activities at the site will normally occur during the following hours (7 am to 5 pm, Monday through Friday), therefore air conditions will only be monitored during working hours. Results from Daily Perimeter Air Monitoring will be posted on this site as they become available.

Daily Weather Reports

Daily Weather Reports will be downloaded from the Delaware Environmental Observing System (MDE004, Newark, DE-Ag Farm) at the University of Delaware’s Agricultural Center, located directly across from the Science and Technology Campus. Daily weather Information will be downloaded from If this weather station is down for any reason (e.g. maintenance, repairs), one of the other surrounding DEOS weather stations will be used for that day.

Perimeter Dust Sampling

Respirable particles are those small enough to be inhaled (respired) into the lungs and include particulates 10 microns or less in diameter. This size airborne Particulate Matter (PM) is known as PM10. The Clean Air Act required the United States Environmental Protection Agency (USEPA) to set National Ambient Air Quality Standard (NAAQS) for pollutants considered harmful to public health and the environment. The standard for PM10 is 150 micrograms per cubic meter (μg/m3). This standard is based on a 24-hour average concentration. For this project, the action level for PM10 is set at 150 μg/m3 . Average dust readings will be collected every 2 hours.

Note: During inclement weather (i.e. rain, snow, below 32 degrees F) dust meters will not be deployed. Excessive moisture or freezing weather conditions in the air adversely affects the meters. Also, precipitation will suppress any dust particles.

Perimeter Asbestos Air Sampling

There is no NAAQS for asbestos. In accordance with the Clean Air Act, the USEPA established National Emissions Standards for Hazardous Air Pollutants (NESHAP) to protect the public from exposure to airborne contaminants that are known to be hazardous to human health. The USEPA and the Department of Natural Resources and Environmental Control (DNREC) have adopted the NESHAP clean-up action level for asbestos abatement of less than 0.01 fibers per cubic centimeter (< 0.01 f/cc). This is the action level established for this project.

Note: Perimeter air sampling for asbestos will only be conducted on days when asbestos containing materials are being managed or abated, except during inclement weather (precipitation). Moisture will damage the sampling pumps. As noted above, precipitation will suppress any dust particles, including asbestos. DNREC regulations and the project specifications require that all asbestos containing materials be identified and removed prior to demolition commencing. No asbestos containing materials will remain within a structure when demolition commences.

Perimeter Lead Air Sampling

The NAAQS for lead (quarterly average, 24 hours a day) is 1.5 micrograms per cubic meter. Since lead dust is only potentially mobilized during actual work hours, the lead action level is set at 5 micrograms per cubic meter which will ensure the NAAQS for lead is not exceeded. Up-wind and
down-wind samples will be collected at the same locations as the two closest stationary dust samplers to the work that may generate lead dust.

Note: Perimeter sampling for lead will be initially conducted on days when operations have the potential to generate lead dust, except during inclement weather (precipitation). Moisture will damage the sampling pumps. As noted above, precipitation will suppress any dust particles, including lead particulate. Only after a safe perimeter airborne baseline for lead is established and URS’ Occupational Safety and Health Administration (OSHA) personnel lead monitoring results for work-zone specific operations are fully evaluated will a reduced sampling frequency for lead be considered.

For further inquiries on the Perimeter Air Monitoring please contact David Levandoski with 1743 Holdings, LLC at (302) 831-7500.