130419-03MN107-App G7 Air Monitoring-IA2E.pdf - NIRB

5040DF-1DF-2GN StandardPM2.5 (ug/m 3 )3020100Apr-2012May-2012Jun-2012Jul-2012Aug-2012Sep-2012Oct-2012Nov-2012Dec-2012Jan-2013Figure 3. 24-average concentration of airborne particulate matter less than 2.5 microns (PM2.5) atMeadowbank DF-1 and DF-2, calculated using volumetric flow rate (non-STP-normalized). Dashed lineindicates the 24-hr average GN standard for ambient air quality, normalized to STP conditions.4.2 DUSTFALLSampling dates and 30-day normalized concentrations of dustfall are provided in Table -Apx 2. Oneset of samples (November 2012) was lost in shipment.Results of the 2012 dustfall sampling program (30-day normalized rates of total and fixed dustfall) areprovided in Figure 5 and 6. Since samples are referred to by the collection start date, one sample hasa 2011 date (collected December 17, 2011 – January 29, 2012). Fixed dustfall formed 80-100% oftotal dustfall in 67% of samples. To provide context, the Alberta Environment Department’srecreational area dustfall guideline of 0.53 mg/cm 2 /30 days is indicated.This guideline was exceeded at DF-1 from January – May, 2012, and at DF-2 in March, 2012. Theguideline was slightly exceeded at DF-3 at two time points (February 2012 – 0.661 mg/cm 2 /30 days;May 2012 - 0.669 mg/cm 2 /30 days), and at DF-4 at two time points (December 2011 6.11 mg/cm 2 /30days; January 2012 – 2.24 mg/cm 2 /30 days). Construction of the Vault haul road immediatelyadjacent to DF-4 in December 2011 appears to have caused the high values at this site in December2011 and January 2012. This station was moved approximately 480 m to the north-west on February29, 2012 (see section 1.2.4).7