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APR 2 5 2008 <br />Attachment I <br />Key to Count Sheets <br />Count Sheets <br />Analytical Procedures <br />Structures identifications consist of an Asbestos Type followed by a Structure Type <br />Asbestos Type Structure Types <br />A = amosite F = fiber <br />An = anthophyllite B = bundle <br />C = chrysotile C = cluster <br />Cr = crocidolite M = matrix <br />T = tremolite <br />NSD = no structures detected <br />/M = other structure associated with a matrix <br />NA = non-asbestos fiber <br />/X = Partly obscured by a grid bar <br />QF = questionable fiber, no confirmation of identification <br />Sizing Conversion <br />I length unit = 5 nun on screen = 0.278 micron <br />1.80 length units = 0.5 micron <br />18.0 length units = 5 microns <br />1 width unit = 1 mm on screen = 0.0556 micron <br />TEM Analysts <br />Jeanne S. Orr Paul D- LoSealzo <br />Greg Behnfeldt Mark Steiner <br />Norberto Zimbelman <br />TEM Confidence Limits <br />35 I <br />30 <br />x <br />s 25 <br />20 <br />a? <br />u y <br />1115 <br />C <br />10 <br />S 5 <br />0 5 10 15 20 <br />Number of Structures Counted <br />Upper and lower 95% confidence bounds for the number of structures counted assuming a Poisson distribution. <br /> <br />File: Shared on server T/Offf- .ag/Att d-.t I <br />Revised: 02aVO2