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Mar 19, 2020 Predicting, budgeting for ongoing ADT maintenance. Unplanned maintenance can result in loss of production, create higher costs for parts and increase service time. By assessing what equipment and tools they use on a daily basis, quarry operators can better predict their expenses and use that information when creating a planned maintenance (PM ... Hispanic Quarry Supervisor Struck by Machine Part During Maintenance On March 29, 2003, a 44-year-old Hispanic stone quarry supervisor was killed when he was struck by a machine part while servicing a rock crushing machine. The victim and two workers were working during the weekend when the quarry was shut down.