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Particles 2.5 microns Particles 10 microns Total Dust Particles <br /> Inside home 0.3 0.7 85 <br /> Toxic Metals <br /> Four 100 cm2 area wipe samples were collected and analyzed for 16 toxic metals. Wipe samples obtain <br /> presence/absence of the materials per the area sampled, but this is very difficult to translate into <br /> "exposure limits'for safety and health. Laboratory results, including analytical methods,are included at <br /> the end of this report. <br /> In the table below, only metals detected are shown (metals not found are not shown). The levels <br /> present on the wipe are compared to OSHA limits by performing calculations based on the Permissible <br /> Exposure Limit as an 8-hour Time Weighted Average(PEL as 8-hr TWA) for each metal. <br /> The limits listed in the table below represent a calculation from the OSHA Technical Manual for <br /> estimating exposure based on area samples. OSHA's PEL's are generally expressed in terms of <br /> concentration in air. There are no limits set for surface contamination. The calculation used in the <br /> table below are intended to estimate the amount of contamination that could be transferred from a <br /> worker's hands and inadvertently ingested. <br /> Based on this calculation,one sample resulted in one metal,Cadmium,present at levels above worker <br /> safety standards. <br /> I Sample If 51 52 53 54 OSHA PEL OSHA PEL OSHA <br /> and Shop 2"d House Pool House— — 8-hr TWA TWA x <br /> Location floor play Attic Joist Table inlets to 8 hr TWA as pg/m3 10/100= <br /> area underside wall mg/m3 concentra <br /> surfaces vacuum tion limit <br /> on a <br /> 100cm <br /> wipe <br /> Antimony 12 0.5 500 50 <br /> Barium 13 29 9.7 5.5 0.5 500 50 <br /> Cadmium 2.1 0.005 5 .5 <br /> Chromium 1.4 1.8 1.9 0.5 500 50 <br /> Copper 2.1 4.3 12 3.3 1 1000 100 <br /> Lead 1.4 2.2 0.05 50 5 <br /> Nickel 1.5 2.1 1 1000 100 <br /> Silver 1.1 0.01 10 1 <br /> Vanadium 2.3 0.5 50 50 <br /> Zinc 21 660 190 130 10 1000 <br /> OSHA considers NO LEVEL of lead safe. Lead is especially hazardous to children. EPA limits lead dust in <br /> homes to protect child occupants. As of January 2020,the EPA limit for lead dust on floors is 10 ug/f. <br /> For a 100 cm2 wipe sample such as these,the result multiplied by 9.29 to arrive at ug/ft2 to compare to <br /> EPA's limit. <br /> 2 <br />