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New Environment (A Division of Heggies Pty Ltd) conducted noise attendance surveys and monitored airborne inspirable dust concentrations at cement batching plants to investigate onsite worker exposure.
As a result of the potentially excessive noise generated by heavy machinery, New Environment has conducted noise attendance surveys on plant workers to determine a Time Weighted Average Exposure over a typical 40-hour work week. Sound levels were measured using a Brel & Kjr 2237A Type I Integrating Sound Level Meter and the resultant field data were used to calculate LAeq8hr levels for comparison with the 85 dBA LAeq8hr exposure limit. Additionally, New Environment investigated worker exposure to inspirable dust as a result of airborne particulates existing at cement processing sites. Sampling was conducted in accordance with Australian Standard AS 3640-2004: Workplace Atmospheres - Method for sampling and gravimetric determination of inhalable dust. Airborne inspirable dust particles were measured in various locations using SKC compensating pumps calibrated to a NATA accredited regime whilst standard workplace activities were conducted. In this method, a known volume of air is drawn through pre-weighed filters, which are re-weighed after the monitoring in order to determine the total dust loading. Average inspirable dust concentrations within the monitoring locations were then compared to the National Occupational Health and Safety Commission (NOHSC) stated guideline.
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