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~ ~ ,~ <br />-- <br />_~. <br />,, <br />. _ , <br />C1, ~~ .. ~ f ~~~ ~~~~;• <br />.._ <br />E,ection LC pre:;ent:; the: par ti.ct~Late In.It CE L' CUIlUC'.Iltr at]Un <br />data tal:_n each t`.ou.rth clay ai: the mine si Ce and loa~ii.ng site. <br />I:c1aL-cd information i.s indicated i.n the r:marks colutml. <br />PIliJD OCCUlU1NC1;S: <br />'Ihe n~•crade tr.irnl :;recd uea:~.trc_l at the ntc:co!:olo~iicnl. 3~_al i.cm <br />located at tl~c mine :.i_CC l'Lcsi :ii'lV ;k I) i.:; i.l I111[, and clic <br />p':cveiliug grind is fto~.n tits c;o~,~11 to r,o.l'ttcc_t (Gl'f, ut: tc•L.li <br />saugrJ.:inrl time). 'C'hc tJi.nd eccunnu•cs are ;iinrraYi;.cLl i.u LabJ.e <br />C, and a grind roes •ahoering Che prev~tili.t~c wind dit:cclion and <br />Cite pcrccnr o.f.' i i.nr; ~ or cnch rr.ind v-~lcc.i i •{ rccrJrdcd a ~: the <br />miue site h~J:= been Cr1I1:;C).OUtUd to graphically represent the <br />triad's activity (figure 3). <br />Hourly rccordings of cr.iud Jircct Len, spec 3 and staiJi.liLy <br />arc prc:cntcd in Scc'.ion III. Vertical_ ~CabiJ_ity i;; a para- <br />mrtc•r u: ed i.o describe the Ccudency fUr l^t: tJ Ca]. IPUtJ.U it <br />in i.hc ~'tmosphcrc. 'Chc d.i.:;j.~cr.;iou of 1.'olluiants is pariially <br />dcpc•ndcrt ou this v'~':'tical InUtUll. ldlnd stalJillty is I:lc- <br />dic•tcd by an ; na l ~•i;;i. , of iiu~ raco .;ind r-pc"%I and triad dirr•.ct iou. <br />'i'hE`re arc four Cla:;S.Lf7.CaL1W15 t'Jh1C11 arc described arc lisicd <br />below: <br />1. Stable: u:;uaLly nightime cendi.tions t:i,ca suric.ce <br />wind:; arc not linlud to synoptic t•ri_uds. <br />Lorr velocity er.inds (51U PIYH) Troia i.he <br />prevailing wind direction and drainage <br />flow occurs. <br />2. Neutral: Curi:ace tai.nds ].i.ul;Ed Co synepiac ari.nd:; <br />Piodcrate to strong vcloci.ty wind ~-l:ccu <br />(':10 fiFII) and usua]ly from i.hc prevailing <br />taind direction witl. minor variations. <br />3. Unstable: Scroug surface heating. Genera!.ly lour <br />velocity tr.ind spccc s with f.L llCtuatlOilS <br />in grind direction. <br />4. 'Transition: U~:c•ur:; whcu iiu: su! face Lavrn ~>}. air <br />is being hca~cd. arialJle uiud dlrcctwn <br />and low velocity w ud speed. <br />I~ DISCUSSIOIJ OP DA'1'trl: <br />~ 'Th^_ high 'TSP .LrdeL•; rtbtai.n•:d from <br />• test site it 7. (o.ld location) are a <br />I~ up by traffic on Che gravel road. <br />', leuyth of the bottom of Ilaydeu Gu <br />~~- -. . <br />Chc high rulurae sc,mL:.ler at <br />direct result of dust stirred <br />This road runs the full <br />Lch, and passes <br />