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<br />i•:r. Dale Ream <br />Cooley Gravel Company <br />24 :.:arch 1975 <br />gage 3 <br />"with the exception of station T+o. 7. (western boundary) <br />the dustfall rate falls within the rar~E;e of dustfall <br />rates from other locations around the metro Den•rer area, <br />Subsequent reports have shown that these gates continued <br />throughout the dust s~.rrveillance program. Even station <br />Teo, 2 is not excessive, for it averages only twice ~l:fte dust <br />of an urban z.rea at z. busy intersection (accordir_g to urban <br />;r:~asurements from the Colorado Department of realth), <br />Station I;o, 2 is also closest to the main quarrying operation, <br />while -the other three stations •:rhich are c•.loser to reside;ltial <br />areas showed only average dustfall rate:., Furthermo~~e, i.t <br />eras found that trrere '.vas a good correlation ( 70;~ of the time <br />intervals tested) bet::een fugitive dust emissions a_nd blasting. <br />This relationship indicates ';fiat relatively large accumulations <br />of dust occur for short periods of time arr? are restricted to <br />the close proximity of the quarry. <br />Fugitive dust is reneral].y considered to be any airborne <br />particulate matter Ori~inati~L~ from man-r-.:~de sevrces Other <br />than burning. In the State of Colorado t'.':ere are no statutes <br />or regulations stating quantitative limits for fugitive dust <br />emissions, This lack of regulations. is reasonable since dust <br />emissi-on is nct.zasily estimated, for several reasons: <br />(PnilCo-Environmen..tal Specialists, Inc. 197;.) <br />"The sources are rot •::ell defined in area or duration <br />of er,;ission; Borne are temporary and others are seasor_al <br />in nature. <br />"Ideteoroiegical conditions, themselves quite variable, <br />cause lame variations in emission rags due to factors <br />such as periods between rainfall and frequency of high <br />wind speeds and atmospheric turbulence. <br />"Emission r. ate is a fur_ction of tha soil or material <br />texture of the suri'ace becoming airborne. <br />"Emission factors for most sources are not available, <br />"Fugitive dust emissions are indistinguishable from <br />naturally occurz•ing dust (bacY,~round) ar,d are often <br />emitted as a result of the same force-•:riu~d erosion." <br />Instead, the '~olorado Dej~artment of Health (1971) set-up <br />quali~tati~~e regulations based upon dust being "offensive" <br />and "objectionable": <br />"?., For the purpose of this Regualtion, fugitive dust <br />