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SUMMARY AND CONCLUSIONS <br />1. The blasting at the proposed MMRR Quarry is likely to cause <br />some damage to the wastewater treatment facility and is likely to <br />cause damage and disruption of the instrumentation. <br />2. The blasting at the proposed MMRR Quarry is likely to cause <br />damage to the lighting facilities including damage to the <br />foundation and the lights. <br />3. Further vibration studies should be conducted once site specific <br />data is available. The results of these studies should be provided to <br />the structural engineer as well as the instrumentation vendors to <br />determine the effects. <br />PURPOSE AND SCOPE OF WORK <br />This report presents the results of a vibration study of the Black Hawk/Central City <br />Sanitation District Wastewater Treatment Plant and Silver Dol1az Metropolitan District <br />Lighting Facilities, Black Hawk, Colorado. The study was conducted for the purposes of <br />estimating the velocities to be expected at the wastewater treatment facility and the lighting <br />facilities caused by the blasting at the proposed MMRR Quarry to be located immediately to <br />the north of the wastewater treatment facility across state highway 119. The study was <br />conducted in accordance with our proposal number POS-58 to Mr. Joe Bernosky, Leonazd Rice <br />Engineers, Inc. dated October 28, 2005. <br />The work consisted of a site visit to the wastewater treatment facility to inventory the <br />i~ <br />structures and to determine the locations of the various structures in relation to the proposed <br />MMRR Quarry. The available information was reviewed and estimations of the expected <br />velocities were calculated. <br />This report has been prepazed to summarize the data obtained during this study and to <br />1 <br />