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Hellickson Quarry Taranaki Concrete Plant <br />Dust control plan <br />Last revision: June 2013 <br />Purpose: <br />Control the release and exposure of fugitive quarry dust and cement dust. <br />Cement Dust: This Is dust released through the transfer of cement mixture to <br />holding bins. <br />Control Measure: Cement releases Into the air are controlled via dust scrubbers <br />and filter attached to the holding bin. All controls must be in place and in <br />working order before transfer of cement is allowed. <br />Dust control bags are emptied and replaced as required by manufacturer's <br />maintenance recommendations. <br />Large releases: Large releases or spills are immediately cleaned up or are wetted <br />down and allowed to harden. <br />Fuaitive quarry dust: This is dust generated by the movement of material <br />around the site. Fine particulate is generated In several locations. <br />1. Road dust: Road dust Is generated from the movement of vehicles Inside <br />the site. <br />a. Control measures include: <br />I. Addition of crushed asphalt to road surfaces. This surface is <br />replaced as needed usually yearly. <br />ii. Speed limits strictly enforced Speed limit inside the site is 15 <br />miles per hour <br />iii. Wetting daily or as needed to control visible dust by the <br />water truck <br />iv. Site maintenance: Trees are planted and maintained on top <br />of the berm to reduce wind velocity and allow for <br />entrapment of particulate. Trees shall be replaced when trees <br />die to maintain an adequate barrier. <br />v. Surrounding fence areas need to be maintained to allow for <br />entrapment of particulate to the greatest extent possible. <br />