Share:

All American Asphalt - Permitting and Source Testing

Title V Permitting

Based on the facility's self-reported emissions through the South Coast AQMD's Annual Emissions Reporting program, the reported emissions in 2018 and 2019 may have triggered Title V applicability. Therefore, on Feb 4, 2021, AAA was notified to submit an Initial Title V permit application, which was submitted on May 5, 2021. South Coast AQMD is currently reviewing the Title V permit application to determine if the facility will be brought into the Title V permitting program.  

If South Coast AQMD determines that the facility qualifies for the Title V program, a public notice is required and will be distributed with a 30-day public comment period. South Coast AQMD will respond to all public comments received.  

The status of all permit applications can be accessed through the South Coast AQMD FIND using the Facility ID 88207. If the facility is brought into the Title V program, the permit will be made available on the website and will be required to be renewed every five years using the same public noticing process. 

More information on all Title V public notification requirements and processes for public hearings are discussed under Rule 3006 – Public Participation (PDF).

For more information on the  Title V program, please visit South Coast AQMD’s Title V Permitting Page.


Permitting Update

On August 27, 2021, South Coast AQMD issued a number of permits for the AAA facility. The permits were approved for: the crumb rubber system/asphalt blending system and the associated asphalt oil heater, electrostatic precipitators, and the carbon adsorption air pollution control equipment. Permit conditions have been included to ensure that the equipment continues to comply with all South Coast AQMD rules and regulations. The permit conditions include periodic monitoring of the exhaust of the carbon adsorption system, carbon change out requirements, throughput limits, and operating temperature limits. The equipment permitted is expected to reduce compounds associated with odors. 

The permits for the above listed equipment can be found below. 


Source Testing Update

As part of the permit evaluation, source tests were conducted at both the inlet and outlet of the new carbon adsorption unit. Testing was performed by an agency approved, independent, third party contractor and the tests were observed by South Coast AQMD staff. Source testing was conducted using EPA and CARB approved methodology. The results have shown that the capture and control system in place (known as the carbon adsorption unit) reduces odorous VOC and sulfur emissions from the crumb rubber/asphalt blending system by 97.9% and 98.6%, respectively. In addition, tests showed that 100% of the emissions created by the blending process are captured and vented to the carbon adsorption unit.

Additionally, source testing for toxic compounds such as metals, polycyclic aromatic hydrocarbon compounds, and speciated organic toxics were performed at the exhaust of the crumb rubber/asphalt blending system. Many of the toxic compounds were so low, they were below the analytical limits and considered to be non-detectable. For those toxic compounds that were detected, an evaluation was performed to determine the potential health risks from the crumb rubber blending system based on the worst-case emission numbers (meaning higher numbers than those actually emitted were used to demonstrate highest possible exposure). Emissions from the natural gas-fired oil heater, which heats the oil for the crumb rubber/asphalt blending system were calculated using emission factors for the combustion of natural gas. 

How is the cancer risk calculated?

South Coast AQMD Rule 1401 lists compounds that are considered toxic air contaminants (TAC) and includes health risk thresholds for permitted equipment. TAC emission information for the crumb rubber/asphalt blending system and oil heater is inputted into a computer-based model that estimates the amount of exposure over a 30 year period also referred to as the potential Maximum Individual Cancer Risks (MICR) for the community closest to the facility.

Cancer risk is the probability of a person developing cancer from continuous, maximum exposure to one or more toxic air contaminants over 30 years and is expressed as the probability per million. The MICR threshold established under Rule 1401 is 1.0 in one million.

Health Impact of Crumb Rubber/Asphalt Blending System

The results of the evaluation show that the cancer risk from the crumb rubber/asphalt blending system with the capture and control unit is 0.135 in a million, and 0.002 in a million for the oil heater; both below the threshold of 1.0 in a million. (See charts below).

Crumb Rubber-Asphalt Blending System

* Chromium was analyzed as elemental chromium. For purposes of cancer risk analysis, all chromium was assumed to be hexavalent chromium (Cr+6) as a worst-case scenario, but actual emissions of Cr+6 are expected to be less.

Newsletter Sign Up
Periodic newsletter updates via Email on a variety of air quality-related topics

South Coast Air Quality Management District

21865 Copley Dr, Diamond Bar, CA 91765

909-396-2000

 

© 2021 South Coast Air Quality Management District