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Protection of indoor air quality

Soil Quality Guidelines for Human Health CCME bases human health soil quality guidelines on human soil contact, inhalation of indoor air, the protection of potable water, and check values for off-site migration and ingestion of produce, meat, and milk. For methanol, CCME’s (2006) protocol was used together with the human tolerable daily intake of 2 mg/kg of body weight to calculate the human soil contact guideline. The soil guideline protective of potable water was calculated using the CCME protocol and a source guidance value for groundwater of 19 mg/L. The source guidance value was calculated as described in the scientific criteria document (CCME 2017) using the human tolerable daily intake value noted above. The produce, meat and milk check was not calculated, because methanol is not expected to accumulate in produce, meat or milk. The off-site migration guideline was not calculated, due to the volatility of methanol. The scientific criteria document provides details of the guideline and check value calculations (CCME 2017). The soil guideline protective of potable water was the lowest of the guidelines that was calculated, and CCME recommends this value as the soil quality guideline for human health. Management Limit Management limits are soil guidelines values that take into consideration issues beyond direct human or ecological toxicity. This includes issues such as aesthetics (odour, soil appearance), flammability, and risk of infrastructure damage. No information was available on methanol concentrations in soil that would lead to offensive odours or to infrastructure damage. However, data were available on the flammability of field soil samples contaminated with methanol (CCME 2017). Samples at 7,460 mg/kg and lower did not support combustion. A safety factor of 10 was applied to this concentration to set the value for the flammability check for methanol in soil to 750 mg/kg