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<br />MOLEN & ASSOCIATES, LLC <br />ENVIRONMENTAL CONSULTANTS <br />2090 E. 1041h Ave., Suite 202 ? Thornton, Colorado 80233 <br />Office 303-450-1600 ? Fax 303-452-4515 <br />August 2, 2010 <br />Connie N. Davis, Land Advisor <br />Aggregate Industries - WCR, Inc. <br />P. O. Box 337231 <br />Greeley, CO 8o633 <br />Re: Mud Truck Analytical Results <br />Broda- Al Platte Valley Site, 1859 North Highway 85, Brighton, Colorado <br />Dear Mrs. Davis: <br />Trucks delivering mixtures of soils and water have been received at the Broda - AI Inert <br />Fill site in Brighton. The trucks, commonly referred to as "mud trucks" routinely deliver <br />a mixture of soil and water to the Broda - AI Inert Fill site. The mud is generated by <br />drilling a utility access line or pothole through common soils at various locations around <br />the Denver Metropolitan area and elsewhere in the State. These trucks use high <br />pressure water to mobilize the soils and a high velocity air induction "vacuum" truck to <br />remove the water soil mixture from the ground. The materials removed are equal to the <br />material that would be removed if the trucks were digging with an excavator, and are <br />only mixed with clean water to allow them to be removed. This method of drilling and <br />potholing is useful to prevent the rupturing or breaks in utility lines. <br />The mud trucks have been a recent concern for regulators at the Broda - Al Inert Fill. <br />To remedy the concerns Broda sampled three discrete mud trucks and had them <br />analyzed for metals and volatile organics. The results of the sampling are shown on <br />Table 1 and the laboratory reports are attached. In addition to the three mud truck <br />analysis there is one soil analysis. When the trucks deliver the mud to the site the entire <br />tank is emptied and a portion of the tank is solids, the solids are the soils that were <br />removed with the water. One of the soil piles from the mud truck was also analyzed <br />separately. The list of the sample names and dates sampled are: <br />Sample Name Sample Date Lab Re ort No. Title on Table 1 <br />DMud-1 61 10 L46798 MT-1 <br />D Mud Truck 2 6/21/10 L465422-01 MT-2 <br />D Mud Truck 3 Water ._ <br />6/21/10 1465422-02 MT-3 <br />D Mud Truck Soil 6/21/10 1465422-03 MT- Soil