Question

5:18 IILTE H1Sum193311.docx Homework 1, Summer 2019, AREN/CE 3311, Construction Engineering, Professor Ghandehari Problem 1.A construction company has 75 full-time employees. During a year the following data Is obtained: Number of minor injuries Number of major injuries Number of days away from work 5 Number of fatal accidents 2 1 Calculate incidence rate for the company Problem 2. Calculate exact OSHA clearance distance in feet if the power line has 210 kV Problem 3. What is maximum limit of sound exposure without hearing protection if exposure is 6 hours a day?

Answer 1

Ans 1) According to OSHA, incidence rate (IR) = Recordable cases x 200000 /number of labor x work time

Assume work rate as 8 hrs per day, then work time = 365 x 8 = 2920

=> IR = 11 x 200000 / (75 x 2920)

= 10.04

Ans 2) According to OSHA table 12-2, for a power line between 50 kV - 345 kV , clearance distance required is 10 ft. So, for power line of 210 kV , clearance distance is 10 ft

Ans 3) According to OSHA maximum limit of sound exposure without hearing protection if exposure is 6 hrs/day is 92 decibel