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RULE 2 PERMITS <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 26A — 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 /> survey and to the Division. For properties owned by Colowyo, a pre-blast survey will not be <br /> necessary. In a report dated February 19, 1991 Colowyo initiated and reported on a Building <br /> Condition Inspection of the Durham Ranch. Although the Durham ranch was located further than <br /> Rule 2 Permits 2.05-13 Revision Date: 12/20/19 <br /> Revision No.: TR-135 <br />