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Attachment B, Technical Revision to the May Day Mine Permit, September 12, 2009. 8 of 35 <br />Sodium Carbonate, Anhydrous (497-19-8) <br />Date: 0I/76/2004 <br />NIOSHWHA, EU CFN or comparable certification organization to protect them against airborne <br />dust. <br />PROTECTIVE CLOTHING: Dry product is generatiy no.-irritating to iaract skin. <br />However, this product can be irritating where skin has been damaged and can create skin irritation <br />after long exposures when moisture is Present. Under such conditions, gloves and long-sleeved <br />clothing are recommended to minimize skin contact <br />COMMENTS: <br />ADDMONAL EXPOSURE GUIDELINES: <br />Federal guidelines treat the 09-di-t(s) in this product as a nuisance dust, as no product-specific <br />guidelines have been issued for exposure. As with all nuisance dusts, worker breating zone concentrations <br />should be measured by validated sampling and analytical methods. The following limits (OSHA and <br />MSHA) apply to this material: <br />Particulates Not Otherwise Regulated: <br />OSHA (PEI. / TWA): 15 mg/m' (total dust); 5 mg/m3 (resp fraction) <br />MSHA (PEL / TWA): 10 mg/ms (total dust) <br />The information noted above provides general guidance for handling this product. Specific work <br />environments and material handling practices will dictate the sclocdon and use of personal protection <br />equipment (PPE). <br />9. PHYSICAL AND CHEMICAL PROPERTIES <br />ODOR: Odorless <br />APPEARANCE: White, granular solid. <br />AUTOIGNITION TEMPERATURE: Not applicable <br />BOILING POINT: Decomposes <br />COEFFICIENT OF OIL / WATER: Not applicable <br />DENSITY / WEIGHT PER VOLUME: (g/ml) Dense Grades = 0.86 -1.12; Light Grades = 0.70 - <br /> 0.90 <br />EVAPORATION RATE: Not applicable (Butyl Acetate= l) <br />FLASH POINT: Non-combustible <br />FREEZING POINT: 851°C (1564°F) <br />ODOR THRESHOLD: Not applicable <br />OXIDIZING PROPERTIES: Not applicable <br />PERCENT VOLATILE: Not applicable <br />Page 4 of 10