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'' ,,~� 5501 Cedar Lake Rd. <br /> 0.�;� . <br /> Q �.'+�- ' ` 5t.Louis Park,MN 5S416 <br /> ' `� ° n�strom Analyticai& 952-252-0405 office <br /> '� �",'""�t Envlranrnental Servlaes <br /> � '`'"^'-_ ��`'='� 952-252-0407 fax <br /> ��-% �'p <br /> Anafysis of Bulk Samples for Asbestos Using Polarized Light Microscopy(PLM) <br /> Fred <br /> Farr Construction <br /> 5665 45th Street SE <br /> Delanc,M n.55238 <br /> Re: 2Q0 H ollander R d. <br /> Number of Samples: 63 <br /> Mefhods and Defin#ions <br /> The su6mitted samples were analyzed us)ng ihe EPA/nterim Method t{600/M4-82-020 <br /> (polarized!lghi microscopy wfth dispersion stoinlrtg). The method defines an asbestos containrng materfa! <br /> as one that contains grater than 1%asbesros by wefght ond asbestos!s de,tTned as the flbrous forms af serpentlne <br /> and certain amphiboles.While the f�brous and non fibrous forms of mrnerals are discernible microscopically <br /> In handspecimens,the distincrion between them Is nat clear on a microscopic Ievel,especially after processrng or <br /> manufocturing.Fibrous amphiboles are genera!!y rhose whose mean aspect ratios(fength over widthJ <br /> under the microscope are approximotely>I0;non-frbraus amphiboles are generally those whose mean <br /> aspect rotros are approximately<E.During analysis,morphology and an estrmate of inean asped ratio <br /> are used to ossign a given mineraJ fJber populatlon to fibrous and non-frbrous categories, <br /> That non-fibrous amphiboles are not reported as asbestos is consistent with mineralogical definitions, <br /> but does not imply lhor non-fibrous omphlboJes ore noi hazordous. Airborrre concentrations of thern <br /> may be regufated 6y OSHA under cenain circumstances.The type of dispersion staining <br /> used is generalfy phase contrast alihough central stop dispersion staining may also be used. <br /> Percentage Reporting <br /> The percentage of each fiber rype present was determined using volume percents <br /> estimated from stereoscopic examfnation,projected area percents from mounted slide <br /> examinaiion and percenis from romparison to weighr percentstandards.Such estimations are suitable <br /> for most samples,but do have large error ranges. Errors are estimated to be 100 relative percent uncenainty <br /> for percentage esYimates under 10%ranging down to as lfttle as 10 relative percent uncertalnty for <br /> percentvge estimofes greoTer rhan 5�96.FriobJe samples which have been estimoted by tRe above mefhods to <br /> contnin less than 10%asbestos can be point-counted,occording to the EPA lnterim Mefhods,as required by IVESNAPS. <br /> !n Iow percentage samples,polnt counting rnoy produce false negatives or positives,due to the sma!!number <br /> of points counted.Forsamples consisting of more than one apporent type of mate�ra!orlayer,the percentage <br /> of each frber type in eoch type of rnaterla!of layer is determined and reported separately;an overaQ average for the <br /> sample of eoch fJber type Is then calculated.The reported frlability of a sample refers to that friablliry observed in the ' <br /> condition onalyzed(broken,crushed,etc.J,and is not to be substituted for an on srte assessment of friability. <br /> Each Angstrom Ano tica!!ab report refotes onJy to the sample tested and may not,due to the sampling process be <br /> , representatTve of t e moterial sampled. <br /> - Aprll 28,201Z. <br /> Kevi Ha en, ` g m Analytical,I nc. <br /> Full Service Laboratory and on-site lndustrial Hygiene Services forthe Hazardous Materials Abatement]ndustry <br />