AECOM Report B&W - N - City of Guelph

City of Guelph2008 Annual ReportClosed Eastview Road Landfill SiteVinyl ChlorideIn addition to the other quality assurance measures outlined, there was a special tube-spiking program usedwith the sample tubes. Each of the sample tubes was spiked in the laboratory with a deuterated vinylchloride surrogate. This surrogate is chemically identical to regular vinyl chloride but can be speciated fromnaturally occurring vinyl chloride because of a small difference in molecular weight. The amount ofdeuterated vinyl chloride recovered was an indicator of the stability of vinyl chloride on the sample tubes.The results of the surrogate-spiking program are summarized in Table 17. The spiking values averaged 59%recovery during the sampling program. The amount of DVC surrogate recovered from each sample wasbetween 30-105% for all sampling tubes. The variation in the surrogate recoveries is likely due to prolongedstorage of the tube prior to sampling. We are confident that any variability in the spiking results is not aresult of the sampling or post sampling storage procedures. However, as a conservative measure, theconcentration values were adjusted on the basis of the surrogate recoveries.Table 17.Summary of Laboratory dVC SpikingTube I.D. Spike Date Sample Date% dVCRecoveredSS34 Nov 7/08 Nov 21/08 105.3SS35 Nov 7/08 Nov 21/08 71.2SS32 Nov 27/08 Dec 11/08 78.4SS88 Nov 27/08 Dec 12/08 31.6SS29 Nov 27/08 Dec 12/08 49.0SS56 Dec 22/08 Dec 27/08 36.2SS35 Dec 22/08 Dec 27/08 41.7SS41 Dec 22/08 Dec 27/08 30.1SS88 (Blank) Dec 22/08 Dec 27/08 87.4Doxins and FuransDisposable latex gloves were used when handling the sample media to minimize any sample contamination.The sample cartridges were installed and removed from the sampler within a short period of time (within 24-hours) before and after each run. The cartridges were collected at the end of each run, wrapped in foil andplaced in a cooler for delivery to the analytical laboratory.ResultsVinyl ChlorideThe ambient air quality sample results for vinyl chloride were taken within the period of November 21, 2008and December 27, 2008, inclusive. The results of the vinyl chloride sampling program, for the eight exposedsamples, are summarized in Table 18.(111414_2ra_apr29-09_city_of_guelph.doc) - 56 -