Document GK980jxJZEYZNGLgdzvZ6dxdV

C;\Documcn(:5 and Settings'^ARTONC\Dcsktop\c6\iaodelmg * AR226- CAB000362 E ID 7 4 4 0 5 5 w IO V __> Minimize Uncertainty Option 1 Option 2 Minimize Model Uncertainty EPA recognizes model uncertainty, especially in short timeframes but doesn't specify over-prediction. Scholarly paper purports air dispersion models conservative by over 2X - only one reference and still doesn't offer alternative Substitute Monitoring Data for Modeling Most likely less conservative than modeling Where and when to sample are critical issues Edge Moor sampling program was $50-60,000 based on 5 sampling events (locations) measuring 24-hr average concentrations at 5 locations. Best approach - Conduct modeling using EPA model (AERMOD scheduled to be approved) compare results with ISC Assume 1 to 2 months; cost of new t*3 meteorological data and modeling time (< $5000) 04/ 10/03 GAB000363 EID744056