Relationship Between San Joaquin Valley Soil Texture and PM 10 Emission Potential Using the UC Davis Dust Resuspension Test Chamber
2001
Carvacho, O.F. | Ashbaugh, L.L. | Brown, M.S. | Flocchini, R.G.
Fugitive dust emissions contribute a large fraction to the ambient PM 10 concentrations in California's San Joaquin Valley. Some of the major sources of this dust include agricultural activities, construction sites, paved and unpaved roads, and wind erosion. The predictive equations recommended by USEPA to estimate fugitive dust emissions from soil sources were developed through empirical relationships between measured emission rates and the soil's dry silt content (the fraction less than 75 µ m physical diameter by dry sieving). The soil's dry silt content is not readily available, though, so this parameter is not widely useful for estimating PM 10 emission potential. The goal of the research described here is to develop a method that will improve predictions of PM 10 emissions from soils. A method was developed to measure the potential for PM 10 dust production from soil using samples collected in California's San Joaquin Valley and a dust resuspension chamber. The PM 10 index is highly correlated to the soil's sand or clay content. In fact, the clay content of the soil is an excellent predictor of the PM 10 index; thus, it is a useful measure of the ability of soil to emit PM 10.
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