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& DAMES & MOORE A DAMES&MOORE GROUP COMPANY July 29, 1998 One Continental Towers 1701 Golf Road, Suite 1000 Rolling Meadows. Illinois 60008 847 228 0707 Tel Payne & Dolan Inc. 847 228 1 1 l Fax 6295 Lacy Road Verona, Wisconsin 53593 Attention: Mr. Brian Wallace Letter Report Particulate Emissions High Volume Air Sampling Site April 29, 1998 - July 16, 1998 Oregon, Wisconsin Dames&Moore is pleased to provide Payne& Dolan with the results of the total suspended particulate(TSP)monitoring program conducted at the Oregon, Wisconsin quarry during the period April 29, 1998 through July 16, 1998. BACKGROUND Payne & Dolan operates a high volume TSP sampler near its Oregon, Wisconsin quarry. Ambient 24-hour average TSP concentrations, taken from midnight-to-midnight, are recorded every third day. This particulate monitoring program coincides with the six day schedule required by the Wisconsin Department of Natural Resources and every third day in between. RESULTS The results of the particulate sampling are summarized in the attached Table. The highest and second-highest TSP concentrations measured during this reporting period were 149 and 86 ug/m3, recorded on May 17 and May 14, respectively. These concentrations, as well as all others measured during this reporting period, are well below the 24-hour Wisconsin Ambient Air Quality Standard (WAAQS) of 150 1.tg/m3 for TSP. The geometric mean TSP concentration for the period April 29, 1998 through July 16, 1998 is -11.2 ;.tg'm3. For preliminary comparison, this concentration is less than the annual WAAQS of 75 µg/m3. Meteorology is not measured as part of this program, as a result, historical monthly average; temperature and pressure readings from the Madison, Wisconsin Airport were used in calculating the TSP concentrations. Offices Worldwide