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4rl(B--* - MEMO - <br /> Environmental <br /> Sciences - <br /> Item D <br /> In 2005, the California Office of Environmental Health Hazard Assessment (OEHHA) <br /> added a chronic Reference Exposure Limit (REL) for crystalline silica. Silica is a <br /> hazardous substance when it is inhaled, and the airborne dust particles that are formed <br /> when the material containing the silica is broken, crushed, or sawn pose potential risks. <br /> Based on analysis of the geology within the area and engineering documentation, the — <br /> crystalline silica content within the aggregate processing was assumed to be 25 percent of <br /> the PM10 emissions. The crystalline silica content within the unpaved circulation areas, <br /> other fugitive dust sources and concrete processing was assumed to be 30 percent of the <br /> PM,o emissions. <br /> ti. <br /> PO Box 365 Indianola, WA 98342 <br /> T-360.265.8111 F-727.578.5210 <br />