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7.3 Zone Dimensions <br />Considerable judgement is needed to ensure safe working <br />distances for each zone, balanced against practical work <br />considerations. Physical and topographical barriers may <br />constrain ideal locations. Field/laboratory measurements <br />combined with meteorological conditions and air dispersion <br />calculations will assist in establishing the control zone <br />distances. When not working in areas that require the use of <br />chemical -resistant clothing, work zone procedures may still <br />need to limit the movement of personnel and retain adequate <br />site control. <br />7.4 Decontamination Procedures <br />As part of the system to prevent or reduce the physical <br />transfer of contaminants by "peopte and,/or' 'lequipment fromthe <br />site, procedures will be instituted for decontaminating <br />anything leaving the Excus-ion®ne an<i ° C�n°tam nation <br />Reduction Zone. These procedures include the decontamination <br />of personnel, protective equipment, monitoring equipment, <br />clean-up equipment, etc. Unless otherwise demonstrated, <br />everything leaving the Exclusion Zone should be considered,. <br />contaminated. In general, decontamination at the Site <br />consists of rinsing equipment with detergent/water solution. <br />Reusable decontaminated PPE --will-,-be stored -,for,. aIr drying,. <br />Decontamination is addressed in two ways: the physical <br />arrangement and control of contamination zones, and the <br />effective use of decontamination procedures. <br />The decontamination process uses cleaning solutions, followed <br />by rinse solutions. Used solution, brushes, sponges, and <br />containers must be properly disposed of. <br />Decontamination Solution <br />Description <br />3 cups Alconox <br />1 cup sodium carbonate <br />5-8 gallons water <br />Commercial Detergent - <br />Full strength or diluted <br />• <br />HS -15 <br />Usacfe <br />Light contamination <br />organic contaminants <br />