Laserfiche WebLink
If the side-by-side test produces comparable results, or results that are readily <br />correlatable, Energy Fuels would request approval to use Method A-7 given that ATDs <br />are substantially less costly to install and maintain. Should the side-by-side test be <br />inconclusive, additional testing would be performed until such time that an appropriate <br />method (i.e., Method A-6 or A-7, or other method approved by the EPA) is found to be <br />applicable for mining conditions at the Whirlwind Mine. <br />5.2 Volumetric Flow Rate Measurements <br />Volumetric flow rates will be measured with a pitot tube and manometer where pressure <br />and flow velocity is high, such as at the ventilation fans. Where the pressure and flow <br />velocity are low (such as at portals, in drifts and in shafts without fans), air flow velocity <br />measurements will be made with a digital anemometer at various points within the cross- <br />sectional area of the drift or shaft and averaged to get a mean flow rate. During normal <br />operations, volumetric flow rates will be measured quarterly. In addition, volumetric <br />flow rates will be measured during start-up, phase transitions, and other periods when <br />significant changes to the ventilation system are made. Intake measurements will also be <br />taken and balanced with exhaust flow rates to provide an overall picture of the ventilation <br />system. <br />5.3 COMPLY-R Modeling <br />The COMPLY-R computer model will be used to estimate the radon-222 dose to the <br />nearest receptor based on inputs provided by the user. The inputs that are required for the <br />program include: <br />• Radon-222 Emissions for Each Exhaust Point - Radon-222 concentrations will be <br />multiplied by the volumetric flow rate data and summed over the calendar year to <br />calculate the total annual radon-222 emission from each exhaust point. <br />• Release Height for Each Exhaust Point - Based on as-built field measurements. <br />• Vent Diameter for Each Exhaust Point - Based on as-built field measurements. <br />• Distance from Each Exhaust Point to the Nearest Receptor - Based on <br />measurements made from field surveys and topographical maps. <br />• Mean Volumetric Flow Rate for Each Exhaust Point - Based on field <br />measurements. <br />• Mean Vent Temperature for Each Exhaust Point - Based on field measurements. <br />• Mean Air Temperature - Based on available meteorological data. <br />19