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I I I I I I I I I I I I I I I I I I I The Minnesota air quality CO standard as regulated by the Minnesota Pollution Control Agency is defined as follows: · I-hour average: 30 parts per million (ppm) · 8-hour average: 9 ppm A summary of the analytical work generated in the ISP Permit Application for the proposed project is provided in the following Tables. Centre Pointe Site - Intersection of County Road C and Cleveland Predicted Maximum CO Impacts Receptor Projected CO 1 Hour Average 8 Hour Average Concentration CO from Source CO from Source From Source Intersection Plus Intersection Plus Intersection Background" Backgroundb (ppm) (ppm) (ppm) I (Proposed Office) 0.0 2.9 2.1 2 (Proposed Office) 0.0 2.9 2.1 3 (Hotel) 0.0 2.9 2.1 4 (Restaurant) 0.0 2.9 2.1 5 (Residential) 0.0 2.9 2.1 6 (Residential) 0.0 2.9 2.1 7 (Office/WH) 0.1 3.0 2.2 Centre Pointe Site - Intersection of County Road D and Cleveland Predicted Maximum CO Impacts Receptor Projected CO 1 Hour Average 8 Hour Average Concentration CO from Source CO from Source From Source Intersection Plus Intersection Plus Intersection Background (a) Background (b) (ppm) (ppm) (ppm) 1 (Proposed Office) 0.2 3.1 2.3 2 (Proposed Office) 0.1 3.0 2.2 3 (Hotel) 0.1 3.0 2.2 4 (Restaurant) 0.2 3.1 2.3 5 (Residential) 2.1 5.0 4.2 6 (Residential) 2.0 4.9 4.1 7(Office/WH) 0.2 3.1 2.3 a City of Roseville, I Hour Adjusted Average = 2.9 ppm. b City of Roseville, 8 Hour Adjusted Average = 2.1 ppm. CO levels predicted at each receptor by modeling traffic levels at County Road C are very low. This is because, although it is the busiest intersection by traffic count, the intersection of Cleveland and County Road C is relatively far from the receptor locations established. Page 26