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Summit Brick and Tile Company Fox No 1 Clay Pit <br /> M-1977-219 -Adequacy Response#3 Page 3 <br /> They are both right . On page 4 of the Mining Plan we <br /> said the depth of the overburden varied from 11 to 45 <br /> feet thick but used an average depth of 25 feet due to <br /> the unknown conditions on the non drilled areas . At <br /> this mine the overburden includes the dirt over the <br /> sandstone and the sandstone itself so using those <br /> numbers were appropriate for discussion in the Mining <br /> Plan. The use of the depth of the sandstone to be <br /> drilled and shot in the Blasting Plan was qualified as <br /> "Typically" found at the mine, to provides leeway as <br /> the mine develops. Since much of the permit has not <br /> been prospect drilled we have to use the best data <br /> available asa discussed in both plans . The same thing <br /> applies to the clay thickness . <br /> 55.5 The Applicant states all blasts will be monitored using seismic instruments. The seismic <br /> instruments will measure ground vibration and peak particle velocity. Please commit to <br /> recording the peak particle velocities in three mutually perpendicular directions from the <br /> blasting site. The maximum peak particle velocity shall be the largest of any of the three <br /> measurements. <br /> 55.6 The Applicant states a seismograph will be placed at the property line between the blast <br /> and the home that is owned by the Applicant and that other seismographs will be placed at <br /> nearby residences if deemed necessary. Please identify the location of all seismographs for all <br /> areas proposed to be blasted. <br /> 55.7 The Blasting Plan does not state how air over pressure will be measured and where the <br /> monitoring instruments will be located. Please provided these details as well as the lower <br /> frequency limit of the planned measuring system in Hertz(Hz). <br /> 55.8 The Applicant states the levels desired for ground vibration and air over pressure have been <br /> set well below that of the State of Colorado requirements. Please provide these requirements. <br /> 55.9 The Applicant states guards will be placed at all roadways that access the shot area. Please <br /> provide more details regarding the distance from the blast area to the guards and clarify when <br /> Siloam Road will need to be closed. <br /> 55.10 The Applicant states the blaster will physically go and check the blast areas and ensure <br /> that there are no unfired explosives before giving the all clear. Please provide a Misfire <br />