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Review of Blasting Operations at Robinson Brick Comparo's Siloam Clav Mine <br /> 2.1.4 Potential for Blast Damage to Area Water Wells: <br /> Water wells nearest to the permitted blasting area have been plotted in Figure 1.1. Well No. <br /> 208418, is the nearest well. The distance between this well and the nearest boundary of the <br /> permitted blasting area is approximately 2,800 feet. The condition of this well is unknown. <br /> In a major study contracted by the United States Bureau of Mines (USBM, Berger et al., 1980 <br /> and 1982), the researchers published the following review of vibration effects on water wells. <br /> "The background review found little that was directly applicable. Observed cases of sueli <br /> damage were caused by permanent ground displacement, such as land sliding, rather than <br /> vibration. The rapes of effects observed required vibration levels many orders of magnitude <br /> higher than typical blasting vibrations and were listed as "casing collapse, earth <br /> displacement, pump base displacement, misalignment of pump cohimu." etc. Cases <br /> specifically involving miring were concerned with pit excavations and included interception <br /> with the aquifer, pumping from bit bottoms, and ground water pollution. " <br /> Information about area wells, from the Colorado Department of Water Resources, indicates that <br /> the depth of area water-wells ranges from 355 to 703 feet and the minimum water depth is 170 <br /> feet. Since the total depth of mining at the Siloam Clay Mine is relatively shallow (less than 60 <br /> feet), the excavations will be hundreds of feet above the ground water table and the aquifers that <br /> feed the wells. Moreover, since the wells are topographically separated from the proposed rock <br /> blasting and extraction areas, ground fracturing and excavations at the Mine will not interfere with <br /> the recharging capability of these wells. <br /> For blasting with a maximum charge per delay of 50 pounds per delay, the particle velocity of <br /> ground motion at the nearest well location (Well No. 208418 at 1,400-ft) would likely not exceed <br /> 0.020 in/sec. Under these conditions, the proposed blasting at the Siloam Clay Mine will have no <br /> negative impacts on neighboring wells or the condition of the nearby water resources. <br /> GEOTEK& Associates. Inc. Page 12 Januan.99 <br />