7 April 2006 Chapter 32 - Urban Industrial Zone 32.1.5.1.7.2 The discharge of non-toxic dusts from any process vent or stack is a Permitted Activity subject to the following conditions: a) Any air pollution control equipment and dust collection system shall be designed to achieve a particulate discharge rate of 125mg/m (corrected 3 to 0 degrees Celsius, 1 atmosphere pressure, dry gas basis) and at no time shall emissions exceed 250mg/m (corrected to 0 degrees Celsius, 3 1 atmosphere pressure, dry gas basis); b) No particles in the emission shall be larger than 0.5 millimetres in diameter; c) Notwithstanding the above, there shall be no visible emission of dust from any process vent or stack (note that ‘dust’ refers to solid particulate and does not include emissions of vapour or droplets); and d) The discharge of non-toxic dust from any process vent or stack shall not result in deposition of solid material on property owned or occupied by persons other than those who carry out the activity. 32.1.5.1.8 Abrasive Blasting Operations 32.1.5.1.8.1 Non Mobile Source The discharge of contaminant into air from abrasive blasting, other than from a mobile source, is a Permitted Activity provided the following conditions are met: 32.1.5.1.8.1.1 Cond itions a) The surface to be blasted shall not contain any lead, zinc, arsenic, chromium, cadmium, copper, mercury, tributyl tin or thorium-based compounds; b) When using dry abrasive blasting techniques, all items shall be blasted within an abrasive blasting enclosure, and air extracted from the enclosure shall be filtered so that there is no visible discharge of dust; c) When using wet abrasive blasting techniques, there shall be no discharge of water spray beyond the boundary of the subject property; d) The discharge shall not raise the ambient dust deposition rate by more than 4 g/mper 30 days at any point beyond the boundary of the subject 2 property; and e) Sand or any other material used for abrasive blasting shall contain not more than 5% free silica on a dry weight basis, and shall not be reused. 32.1.5.1.8.2 Mobile Source The discharge of contaminant into air from abrasive blasting using a mobile source is a Permitted Activity provided the following conditions are met: 32.1.5.1.8.2.1 Conditions a) The surface to be blasted shall not contain any lead, zinc, arsenic, chromium, cadmium, copper, mercury, tributyl tin or thorium-based compounds; b) The Council and owners or occupiers of properties adjacent to the subject property shall be notified of the location, date and duration of the proposed abrasive blasting operation at least five working days before the commencement of the work; 32 - 11