4. Go to the OSHA website and find safety recommendations for trench excavation. As you finished the estimate, you checked the OSHA regulations for trenching and you found some very important information that you want to share with your uncles. Additional Information: Table 7.1: Expected Productivity, Labor, and Equipment Costs Activity Description Productivity Labor Equipment Cost ($/hr) Laborer Operator Trench Excavation 160 LCY/hr 127 Place Bedding Material 42 LCY/hr 2 50.40 Compact Bedding Material 25 LCY/hr 1 0 10.40 Lay & Joint Pipe 23 LF/hr 5 B1 Backfill Trench 130 LCY/hr 0.5 1 112.50 Compact Backfill 120 LCY/hr 0.5 1 135 Overhead 22.50 Table 7.2: Costs Summary Item Unit Cost Pipe Material $48 /LF Bedding Material $17 /LCY Excavator (including operator) $127 /hr Laborer $26 /hr Operator $37 /hr Foreman $40 /hr Truck $20 /hr Trailer $2.50 /hr