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Aeg EAWHONMW�VTAL <br /> 6MCHEMSTOV, INC. <br /> Ms, Mary ,hlcayy's vov nlb�r 9, 199' <br /> Public Health Setvict <br /> R Q. Box 2009 <br /> Stockton, CA 95201 <br /> 14Is. Meays: <br /> My apologies for fie dela\ in �rti7�i�iY:? t5:lfi iGfcr�atioa ,-our.iluested Laour oliorz <br /> discussion last month, t� lea pmvi&� iniormi cion docuonentn- Lhc Ilse of i;quid-solid <br /> :::traction and dirtet in' -11ca for th r dc;cccion of volwtile aromatic hvtlra;az1-. " (BTEX) at a <br /> d2urction li;vel of 5 ui. !�Z eppb by ;.ti�i�i]r?. Yoa raised 2 pr=', a:-, cuesdons is uur discussion <br /> - which you requr<_'wd rue to answer. <br /> 1- Cats a 5 j tilDL be a4hiet,ed by direr_ in}ec:t.io ' <br /> 2. Are art; lust in zh.- extracuon pr^-cess us n, frcon' <br /> achievable <br /> I <br /> aslk- td TEG -Sjac D=arn-, to perforin. an I'VID -, amv.,'i.7 ibis qu)t titicm xi3h loam, id'hcr <br /> Ehar: verbasc. The 6a2 from thc>_r test anShawn on de next n-C. YOU Can observe the <br /> followin m thf--te data: <br /> The % PtiSD is ver,, good and well wi.'rin EPA required contintt .na calibratinn limits. <br /> The ILDL's for each •.ompotmdl , comput,d as 3 standud d>vi*,tioi3s of the c:al.ul-ated <br /> co centmi ons (0.015/area)', are 0.005 or less. <br /> Eat' Lai Dwin l-xtracticn <br /> As I explained. t;se Henry's law c4nstanl% gives fl= e uilibriurn :atfu of M•o?=uies of a <br /> cor:pound in It vapor phase to molt6ules in ine liquid phnsC (i.e., The uivem of the aqueous <br /> solubiiiry). Typically, the liquid is water. For the aromatic byzim--aYbaus, Ix Hcriry', law <br /> con-stams rwge from 0.1 to 0.2 as s12oivn in the accoiTlp:inyin3 Lahic. "K1:`, tits mv-azis is that at <br /> egtidinrium, 5 to 1.0 rn-olecults tesidc it file liquid for eveiT 1 tat resides in the vapor. In aLher <br /> words, 205o to 20 c paritior. into chc vapor_ This is for water. Freou-113 is les pular Lhan <br /> water, so It's ;7f nivv for trate BTEX co niponcrats is Smith higher thanS+ti at� c •. Thus. the <br /> par roning {;tp the vapor WD het,?us:?L less ti p the arrl,un. gisreri b e..r3�'s law. So, <br /> th-corecicallT, the loss into the hewdspace is the ;'DA vial should be sigrelficartl a lass than <br /> To pro-c :,he rthton , we naeasured the &TEY in tic hieadspace of a sample arld in the soil, and <br /> calculated the tonal mass Ui ea:h phase, A s rr:ar; of the or be=nc, toluene, amd <br /> xylem was as follows: <br /> Kcadsp+act lkng) .soil (III) Ratio (17r) <br /> Bc=enc: 38 25141 0.15 <br /> Toluene: 1 1783 0.04 <br /> Xylene: 1 5528 0,CP04 <br /> MGt'iaa :LA66O.rMtCry,47a1y*:c9'�E+rf;��* �ry �ar^c dl� �::rs�ISi7 s tf rw� +;•; <br /> nrr;ca1R U Sr.f;VMca,•S�ivars A� <br /> 432 N. Cedros Ave.. Solana Beach., CA 92-075 Ph: (619) 193-G401 F": ;619; 79;-W4 <br />