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Complaints have been received from residents living closeby to this landfill site, regarding issues of odour...

Complaints have been received from residents living closeby to this landfill site, regarding issues of odour and noise. A noise audit at the site boundary revealed the following data :- Dozer 100 dB(A), Roller, 105(dB(A) and Scraper 110 dB(A).
a. What is the noise level when the dozer and the scraper operate together ?
b. What is the equivalent continuous equal energy level if all three pieces of equipment operate successively for 2 hours during a six hour period?

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