Agenda Packets - 1987/05/11 - Laserfiche WebLink

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devid breeleu dbassociates, incorporated 1313 Sthstreet s.e.. su,te322 . m-nneapohe,mn 55414 . tetephone 612.331.4571 26 March 1987 MEMORANDUM TOe Robert Byers FROM: David Breslau I RE: Evaluation of Air Quality Impacts from Proposed Service Station located southeiiat of the intersection of TH 10 and Silver Lake Road in Mounds View, Minnesota A schematic of the service station facility evaluated here is shown in Exhibit 1. The existing Rindercare building on the north side of TH 10 is shown schematically on the 'drawing, which is not to scale. TH 10 at this loction is a four -lane divided highway facility with an pm. peak hour traffic volume of approximate 3000 vehicles per hour. ® Primary sources for air pollutant emissions from the service station are the filling of underground tanks, the filling of vehicle tanks at the pumps, possible spillage, and exhaust and evaporative emissions associated with vehicles as they use the facility. Nhile these emissions include hydrocarbons, nitrogen oxides, sulphur oxides, and carbon monoxide, it is anticipated that hydrocarbon emissions will be the primary contributor to any pollutant concentrations near the site. Hydrocarbon emissions associated with the filling of the underground tanks will likely be the major source at the site. These loading losses are due to vapors leaking into the air as they are displaced by incoming fuel. Methods for calculating these losses have been developed by the U.B. Environmental Protection Agency and have been used here to estimate the amount of hydrocarbon emissions which can be expected. While storage for approximately 18,000 gallons appears to be provided on the site, deliveries will be made only periodically. Assuming that the tanks are splash loaded at the rate of 1000 gallons per hour, hydrocarbon emissions are estimated to be approximately 400 grams/hour. This will occur only periodically, depending upon sales and requirements of the service station. The normal servicing of vehicles at the station is anticipated to yield emissions well below this value, since it would take one vehicle per minute taking on 16 gallons to equal this flow. Normal emissions associated with fueling at the pumps is estimated to be lees than 100 grams/hour during peak ® activity hours.