Agenda Packets - 1987/05/11 - Laserfiche WebLink

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The relative impact of these emissions can be evaluated In the light of vehicle emission which already occur near the site (primarily from vehicles travelling along TH 10). While exact values for Hydrocarbon emission are not available for Minnesota vehicles, A value of 10 grams/mile is estimated to represent the mix of automobiles and trucks which travel TH 10. This assumes hydrocarbon emission to be only 20t of carbon monoxide emissins and Is based upon the MOHILE3 emissions model developed by the U.S. EPA. Since pollutant concentrations along the roadway at intersections can be attributed to free -flowing as well as queueing traffic, it is estimated that approximately 1900 grams/hour are emitted near the intersection of TH 10 with Silver Lake Road, due to the vehicles travelling along these roadways. Thus, normal peak, hour emissions at the site are considerably higher than what can be expected from storage tank filling or normal operations at the station. The primary effect of hydrocarbon emissions is the creation of ozone rather than direct health effects caused by carbon monoxide or other toxic pollutants. An ongoing Study along TH 10 to the south of the study site has shown carbon monoxide levels to be well below state ambient air quality standards. Since the metropolitan area is no longer designated a non - attainment area for ozone, strict controls on hydrocarbon emissions are not required on service stations or other minor sources evaporative emissions. r, Contact with the Minnesota Pollution Control Agency Indicates that no problems have been encountered with service stations of the type considered here in terms of toxic or odor emissions. It is possible that an accidental spill could create emissions for a short time that may create detectable odors. However, it is expected that the facility will be kept clean and that any spills would be treated immediately in accordance with Minnesota Pollution Control Agency procedures. Should problems with emissions from the facility occur in the future, methods are available for controlling the evaporative emissions from storage tank loading.