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Picture #3: Rock dust silo and baghouse. The pulse jet baghouse controls emissions during product <br />loading, but a damaged access door gasket led to visible emissions during the inspection (observed during <br />product loading). Following the inspection, the source identified the problem and replaced the door, with <br />no visible emissions observed since the maintenance was performed. <br />Picture #4: Rock dust silo area showing buildup of material on the ground around the silo, as well as on the <br />adjacent block wall. <br />2012 Air Pollution Inspection <br />0510015-INSP-2012.docx Page 29 of 30 <br />