CCP 01-11-1999 - Laserfiche WebLink

Home Browse Search

1 I' . 1 I I I 1 I 1 .. I I I I I I I. I I '%J (CO), hydrocarbons, nitrogen oxides and particulates, The primary pollutant of concern is CO for the following reasons: · CO is a tasteless, odorless gas that can cause health effects at relatively low concentrations for relatively short exposure periods, · The Twin Cities metropolitan area is classified by the V,S. Environmental Protection Agency (EPA) as a moderate non-attainment area for CO. · The Minnesota Pollution Control Agency (MPCA) requires an Indirect Source Permit (ISP) for construction of development with an associated parking facility containing more than 2,000 parking spaces, The ISP is intended to regulate CO. Rice Creek Corporate Park will require an ISP from the MPCA prior to construction. This draft EIS is intended to provide the information needed by MPCA in support of an ISP for the project. CO is a byproduct of the combustion process. CO is emitted at a higher rate by vehicles that are idling, accelerating or decelerating than those that are cruising at a constant speed, CO is emitted at a higher rate by vehicles traveling at a lower speed than at a higher speed. For these reasons, CO concentrations are generally highest in the vicinity of signalized intersections where vehicles are delayed ~nd emitting more CO, High CO concentrations generally occur in close proximity to roadway vehicle sources. Generally concentrations approaching state air quality standards are within about 100 feet of a roadway source. Further from the road, the CO in the air is dispersed by the wind and meteorological conditions such that concentrations fall off rapidly, The state ambient air quality standards for CO are 30 PPM (parts per million) for a one-hour period and 9 PPM for an eight-hour period. These standards are set at levels to protect the most sensitive members of the population and are not to be exceeded more than once per year. The concentration of CO at any particular location is composed of both CO from local roadway sources and ambient or background CO from remote sources. To fulfill MPCA ISP requirements, a background CO monitoring program was conducted on the project site. The purpose of this program was to quantify existing background CO concentrations in the vicinity ofthe project. The monitoring was conducted between July 13 and July 27,1998 at a site located in the southeast comer of CR J and Naples Street. The monitoring was conducted by Interpoll Labs, Inc, using equipment and procedures approved by the MPCA and EP A for this type of work. A performance audit of the monitoring equipment was conducted by MPCA and it was found that the monitor was operating within accepted limits. During the two-week monitoring period, the maximum monitored one-hour average CO concentration was 1.5 PPM relative to a standard of 30 PPM. The maximum monitored eight-hour average CO concentration was 1.2 PPM relative to a standard of 9 PPM. The overall average CO concentration during the two-week period was 0.54 PPM. WISP ARK Rice Creek Corporate Park Draft EIS December 10. 1998 Page 77