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Record Keeping <br />• They must note weather conditions, including those which <br />may cause possible adverse blasting effects. <br />• They must record the type of material blasted. <br />• They must incorporate sketches of the blast pattern, <br />including number of holes, burden, spacing, decks <br />and delay pattern. <br />• They must specify the diameter and depth of holes, <br />and the type and length of stemming. <br />• They must record the types of explosives used, the total <br />weight of explosive used per hole, and the maximum weight <br />of explosives detonated in any one 8 millisecond period. <br />• They must specify the initiation system. <br />• They must provide details of mats or other <br />protections used. <br />These details must always be provided for any blast, <br />irrespective of whether or not vibration monitoring is to take <br />place. <br />If vibration monitoring is required by OSMRE regulations, then <br />the following information must also be included in the records: <br />• Type of instrument; sensitivity (or "range setting ") <br />and calibration signal or certification of annual <br />calibration. <br />• Exact location of instrument, and the date, time and <br />distance from the blast. <br />• Name of the person and firm (can be the operator) <br />taking the reading. <br />• Name of the person and firm (can be the operator) <br />analyzing the seismographic record. <br />• The vibration level and /or airblast recorded. <br />The above vibration monitoring records are also the minimum <br />necessary to support any seismogram or airblast recording, even if <br />monitoring is not required by regulation. If monitoring is carried <br />out, for whatever reason, it cannot be over emphasized that proper <br />records must be kept. Attempts have been made in the past to <br />reconstruct "blast records" from explosives supply invoices, and to <br />develop support for seismograms from memory. Such poor record <br />102 <br />