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Chapter 4-Site-Specific Industrial Storm Water BMPs <br />.7 <br />• <br />r1 <br />LJ <br />Advantages of Loading and Unloading by Air Pressure or Vacuum <br />• Is quick and simple <br />May be economical if materials can be recovered <br />• Will minimize exposure of pollutants to storm water <br />Disadvantages of Loading and Unloading by Air Pressure or Vacuum <br />• May be costly to install and maintain <br />• May not be appropriate for some denser materials <br />• May require site-specific design <br />• Dust collectors may need a permit under the Clean Air Act to install <br />4-27