Detailed Quantitative Risk Assessment for Hangar Line ...
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NovaTox Inc. 10 Crane Avenue Guelph, Ontario N1G 2R2 Tel 1.877.680.7256 Fax 1.519.231.0130 http://novatox.ca Christopher Marwood, PhD Ecological Risk Assessment [email protected] Mark J. Chappel, MSc, DABT Human Health Risk Assessment [email protected] Detailed Quantitative Risk Assessment for Hangar Line Complex, CFB Borden Client Defence Construction Canada Location CFB Borden, Ontario Date Completed 2013 NovaTox and DST Consulting Engineers were retained by Defence Construction Canada to complete a site specific risk assessment for the Hangar Line Complex, a large parcel within CFB Borden east of the World War I airfield including a 1-km long section of Hangar Road and numerous historical hangars, garages, and fuel storage facilities. A detailed testing program performed in conjunction with the DQRA identified numerous chemical impacts in soil across the site, including elevated pH levels at various locations; elevated electrical conductivity; polycyclic aromatic hydrocarbon (PAH) impacts associated with a nearby former rail line and/or coal storage, former aircraft repair shop, former machine shop, and former garage; benzene impacts associated with a former aircraft fuel storage facility; and impacts from petroleum hydrocarbons (PHC) associated with up-gradient sources. Impacts to groundwater included ammonia, PAHs, and inorganic parameters exceeding federal guidelines across much of the site associated with historic site activities. A human health Detailed Quantitative Risk Assessment (HHDQRA) was conducted in accordance with guidance from Health Canada for evaluating potential risks to human receptors from chemical contaminants. The HHDQRA focused on potential risks to numerous receptors groups including construction/utility workers (potentially exposed to soil and groundwater), CFB Borden workers (adults), teen-aged cadets, outdoor maintenance workers, and site visitors potentially exposed to chemicals in soil via incidental ingestion, direct dermal contact, and inhalation of particulate pathways. Non- carcinogenic hazards as a result of potential exposure to contaminants in soil were below the maximum acceptable for all human receptors. Carcinogenic risks for benzo[a]pyrene and toxic equivalents (TEs) exceeded the acceptable cancer risk limit (10 -5 ) for CFB Borden staff and maintenance workers, suggesting that these receptor groups may potentially be at risk as a result of exposure to carcinogenic PAHs found in soil in the absence of risk management measures. A detailed quantitative ecological risk assessment (DQERA) was conducted according to the most recent federal guidance to quantify risks to terrestrial plants, soil organisms, and urban-adapted wildlife from root uptake, direct/dermal contact with soil, ingestion of soil, and ingestion of food and prey items. Exposure ratios for terrestrial plants, soil invertebrates, and all wildlife receptors were less than one, with one exception: the 95th percentile concentration of benz[a]anthracene in soil exceeded the toxicity reference value for plants. However, benz[a]anthracene impacts in soil were limited spatially to one small area of the Site, and therefore overall risks to ecological receptors were considered minor.
Transcript of Detailed Quantitative Risk Assessment for Hangar Line ...
NovaTox Inc.10 Crane Avenue
Guelph, Ontario N1G 2R2Tel 1.877.680.7256Fax 1.519.231.0130
http://novatox.ca
Christopher Marwood, PhDEcological Risk Assessment
Mark J. Chappel, MSc, DABTHuman Health Risk Assessment
Detailed Quantitative Risk Assessment for Hangar Line Complex, CFB Borden
ClientDefence Construction
Canada
LocationCFB Borden, Ontario
Date Completed2013
NovaTox and DST Consulting Engineers were retained by Defence Construction Canada to complete a site specific risk assessment for the Hangar Line Complex, a large parcel within CFB Borden east of the World War I airfield including a 1-km long section of Hangar Road and numerous historical hangars, garages, and fuel storage facilities. A detailed testing program performed in conjunction with the DQRA identified numerous chemical impacts in soil across the site, including elevated pH levels at various locations; elevated electrical conductivity; polycyclic aromatic hydrocarbon (PAH) impacts associated with a nearby former rail line and/or coal storage, former aircraft repair shop, former machine shop, and former garage; benzene impacts associated with a former aircraft fuel storage facility; and impacts from petroleum hydrocarbons (PHC) associated with up-gradient sources. Impacts to groundwater included ammonia, PAHs, and inorganic parameters exceeding federal guidelines across much of the site associated with historic site activities.
A human health Detailed Quantitative Risk Assessment (HHDQRA) was conducted in accordance with guidance from Health Canada for evaluating potential risks to human receptors from chemical contaminants. The HHDQRA focused on potential risks to numerous receptors groups including construction/utility workers (potentially exposed to soil and groundwater), CFB Borden workers (adults), teen-aged cadets, outdoor maintenance workers, and site visitors potentially exposed to chemicals in soil via incidental ingestion, direct dermal contact, and inhalation of particulate pathways. Non-carcinogenic hazards as a result of potential exposure to contaminants in soil were below the maximum acceptable for all human receptors. Carcinogenic risks for benzo[a]pyrene and toxic equivalents (TEs) exceeded the acceptable cancer risk limit (10-5) for CFB Borden staff and maintenance workers, suggesting that these receptor groups may potentially be at risk as a result of exposure to carcinogenic PAHs found in soil in the absence of risk management measures.
A detailed quantitative ecological risk assessment (DQERA) was conducted according to the most recent federal guidance to quantify risks to terrestrial plants, soil organisms, and urban-adapted wildlife from root uptake, direct/dermal contact with soil, ingestion of soil, and ingestion of food and prey items. Exposure ratios for terrestrial plants, soil invertebrates, and all wildlife receptors were less than one, with one exception: the 95th percentile concentration of benz[a]anthracene in soil exceeded the toxicity reference value for plants. However, benz[a]anthracene impacts in soil were limited spatially to one small area of the Site, and therefore overall risks to ecological receptors were considered minor.
