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• DUST CCPlTRCL ?RACT:CES IN THE FACE AREA <br />6. Other required dust controls. <br />Item <br />6a Crusher Tail Covers <br />6b Increased Air <br /> <br />• <br /> <br />Date In Dust Conc Dust Conc <br />Effect Before After <br />1'L-13-85 <br />4.7 mg/1 <br />3.8 mg/i <br />i2-26-85 <br />-33a- <br />3.8 mg/1 <br />