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RULE 2 PERMITS <br />the timing of each hole and the maximum number of holes that will initiate within the prescribed <br />time period. <br />Examples of the maximum pounds of explosives per 8ms period of time versus the distance to <br />local residences and dwellings of concern is reflected on Map 26 — Blasting Analysis Map. <br />Colowyo has historically calculated the maximum weight of explosives detonated with any 8 ms <br />time period by the following means: <br />(Max. no. of holes in an 8 -ms) x (Max. lbs. of explosives put in any one hole) <br />The maximum charge weight has been calculated this way to ensure that any blast designed under <br />this criterion would not exceed the allowable amount using the scale distance formula. Thereby, <br />meeting the intent of the law to not exceed the maximum weight of explosives in any 8 -ms time <br />period. Colowyo's blast records reflect the maximum weight of explosives using the above <br />method. <br />The typical blasting parameter tables are merely examples of the programs used in blasting coal <br />and overburden at Colowyo. As such, they are not intended to represent any one blast exactly as <br />conditions in the field dictate the exact design for each blast. For example, an overburden blast <br />may be drilled with an offset pattern, 25 feet x 30 feet spacing and tied in row on row rather than <br />the design shown on Table 2.05-5. <br />The blast initiation systems that Colowyo uses may vary, but all are noted on the blast report for <br />each blast event. For example one type of blast initiation system is the EZ Dets system. These <br />systems are used to initiate the blast from the certified blaster to the initiation hole and all other <br />holes then tied into that system. An entire initiation system could consist of down the hole caps, <br />delays, and tubing connected to a surface system of cords, delay connectors, and initiation <br />terminal. The system is designed specifically for each blast event to not exceed the requirements <br />of the scaled distance formula or the one hole per 8ms time period requirements. Types of blasting <br />materials and delays to accomplish this are noted on each blast report. <br />Blasting Records <br />Colowyo will keep a record of each individual blast by utilizing report formats shown in Figure <br />2.05-2 - Blasting Report (coal and overburden), Figure 2.05-3 — Colowyo Chargeweight Sheet <br />(overburden only). <br />These blasting records, along with monthly pit records (hardcopy and electronic copy) can be used - <br />to compile all of the information necessary to recreate the blast and contain the data necessary to <br />comply with Rule 4.08.5. <br />Pre -Blasting Survey <br />Pre -blasting surveys and assessments of surface structures or other structures will be conducted <br />upon request by residents or owners of dwellings located within one-half mile of the Permit Area. <br />A written report of the pre -blasting survey will be promptly provided to the persons requesting the <br />Rule 2 Permits 2.05-14 Revision Date: 5/25/18 <br />Revision No.: RN -07 <br />