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`/~Matheson <br />`~ Mining <br />C Consultants, Inc. <br />2801YOUrrgfiekl Street, Suite 171 <br />Golden, CO 80401-2266 <br />3035838 <br />Toli Free 888-458-5638 <br />Fax 303456-5839 <br />www.mathesonmining.com <br />March 18, 2005 <br />Mr. John Hotlentredc <br />ACA Products <br />702 Gregg Drive <br />Buena Vista, CO 81211 <br />RE: Blast vbratlon Monitoring, Marsh 15, 2005. <br />Dear Mr. Hollenbedc, <br />R~cF~~F <br />0%vi~~on ~ j?p46 <br />tilln~ng ~ aeSa e y on <br />Matheson Mining Consultants, Inc. monitored one blast for ACA Products at their quarry southeast of Johnson's <br />Village, Coloredo al 16:25:32 on March 15, 2005. The seismograph was located on the west side of the dam <br />on bedrock appro~nately 700 feet north of the closest corner of the blast. The peak particle vekx~ly measured <br />from the blast was 0.02 Inches per second and the peak air overpressure was 115.6dBL. The measurement <br />was wtthin the pem~ NrtYt of 2.0 int2res per second errd does not pose arty poterrhal hazard to the dam. <br />Attached to this letter are the vibration record and the calibration certificates for the instrument, geophone and <br />rtrtrirxaoptrone used to make the measurement Please cooled our office should you have any questions <br />canceming the attached or should you require additional information. <br />S~inceprely, <br />L..CJI. <br />Colin Matheson <br />President, Mining Engineer <br />