The El Dorado County (EDC) and the Sacramento, Placer and Yolo-Solano air districts have recently been awarded two Targeted Airshed Grants (TAG) from US EPA to reduce emissions of fine particulate matter (PM) in the region. The second of these two awards will be presented to the Board of Supervisors for consideration on 8/16/22. The TAG grants will fund several projects. One of those projects is the paving of nine unpaved road sections in EDC. The work will be performed by EDC Department of Transportation.
Road dust accounts for 6% of directly emitted PM 2.5 (less than 2.5 microns in size) in the region. While overall the US has some of the lowest PM levels of any developed country, certain areas including the Sacramento region do have high levels on occasion. Several adverse health effects are associated with exposure to PM including heart and lung related conditions. PM exposure primarily affects infants, children and older adults with preexisting heart or lung diseases.
The roads selected to be paved are those with the highest Average Daily Traffic (ADT) counts. The roads and the fiscal years (July-June) in which the paving was completed or is planned are:
Oriental Street 21/22
Tullis Mine, South Street and Bear Creek Road 22/23
Sand Ridge, Sweeney and Luneman Roads 23/24
Mt. Murphy and Russell Hollow Roads 24/25
The paving of these roads will result in annual PM 2.5 emission reductions of 42 tons and lifetime PM 2.5 emission reductions of 293 tons. The sections of Oriental and Bear Creek Roads to be paved lie within Naturally Occurring Asbestos (NOA) areas. In 2003 the California Department of Toxic Substances Control conducted a study that evaluated airborne NOA concentrations before and after a road was paved in Garden Valley. The study found up to a 100-fold reduction in the airborne asbestos concentrations near the roadway.
Learn more about the Air Quality Management District
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