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During drilling and well testing operations, 24 hour working is permitted. Day time noise emissions must not exceed 65dB LAeq, 1 hour, as measured 1 metre from the façade of any receptor and night- time noise emissions must not exceed 45dB LAeq, 1 hour, as measured 1 metre from the façade of any receptor. Noise limits vary depending on the day of the week and the time of day.