Document XOEavn19rGyMbmvZgBG2Qj8gd

-ee: A* J. Pahnlia. Orchem, Pet. Lab. ip**- f 18*. J Delate, CB&S, mUU March 17, 1972 E. S. JACOBS ORCHBM - ...... "~"' PETROLEUM lABQRAXQBt; <y"w ^ * - t, ' S.V1CAK TJCAP STUDY ;. Afc - ft, data from-those urioe^indbibod *p*^^ V*f- 4' thcou^i 3/7/n^ 'beenconducted for ******** *** A summary ofthis bas1c data 1* given In Table 1. The data in this table do not rapraiant theiimaaubjacts each year because: <1) some sub jects left during thecourse ofthejetudy, (2) replacement subjects were added, (3) specimen* were not obtainad on every subject every year. It haa bean shown lin aimiyaii oiQ^^^ that differenees -B^at^^iu-laadi:lavala5^dcdrding>td|a.|ii^^XdJAi,.Mit*tipn,,iid;;Ioatioa. .... ,v . Because - the; mix of thesa-factors-t^^ reportedinTabl* _I, a 1aecond constant lathe data as runonthe datafrom only those - V subjects-with urine datal,-v v** for analysis of blood ai^aboutOBie third of " ths l971blood spclmsns hav not yat ibssn analysed forlead. Therefore 'fhS?taaidpUi^ ectsuho hadblood speeioenstaken : the: firit^fd^r-j^aari''" is ^also included -for 1971 blood lead on' dMi; subjactly '' tikenforallfivayearao ' study,'" ?-Sincif ts reouiiniBonstantfrbni y*ar :to year -'in'-this' analysis .it is assuibsd-ItHallAyy ...duO.Ciax'l job Iblassifieation or. location' would be' iIiMnata3vi0^|i^ttlti'"ofltilii'TAisalysl^arerprasantad: in Tahla u. --- - - - His tograms wera sub"obtained indicating distribution of the data in fable II (see enclosure) . TableS III and lV present the urine and blood data by loca tion for each year of the-iStudy. , Xt should be noted in dealing with these results that .limits have been set atboththelower-aad^^u^ endsof the data'Reported.. At the lover end of the dataithaflln^^ the sensitivity of the chemical analysis vith lO ^ 10 pgm Pb/100 ml blood reported for all deteroinatians of lO jigm or-less. The limits set at theupper end of the data are 150 pgm Pb/liter urine and 70 ugm/100 ml blOOdf l Throughout the experiment whenever lead values higher than these limits were obtained a repeat specimen was requested.- N26990 DUP040005862 ....... l.t . S.JACOBS March 17,1972 StfSaf* During the fir* year* of tha atirfy^Sfi^ap^tittrlna aaiaplaa and 18 repeat blood specimens were requ**td bac^^^ . Fable V gives yearly *ggmff*ig of rmg^r of high^vaiqaa. ~-Whlla-gapaat specimens vara actually obtslart for only abouthalfofthe number requested, only five ' ^ subjects hadhigh lead levelsoh the repe*tapacimsns. IvV-.i*1 -- .... .......... :--!' .> :_i: l l j :' : .. _ ... - inquiriesabout these five subjects *eveIla^e*traneo^^ for ?vH&e- -aaaunad - ^^tBar.tMi'aaaV _________ ,,, , __ ___r...... t, ,^IU___. ;fheiaanpla' dr analytical error, tharefore thase valuas wara allexcluded fronthe currant data' analysis, , A record haabeen haptofalllMgblesd Values andthesig- uifieance of these will be consideredinthefinal interpretation of the study. _ ` Finally! wislrtcgitress;. thatthe; datareportad beta are not., cony.lata. For the 1970' andl971 datai it;was neceesary tobypasa sons' `Of the: checks: normallycondueted to aseure acCTure^ :data'ln;orderrto neat ; the deadline. 'The.2of the value* reportedhnirtfeaSSenueg^^ l the overall picture rwould"..................... fWEnclosures ( 5 )