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Memo to Kate Pickford 3 December 19, 2007 <br />Blasting Vibration Control Plan File No. M- 2007 -080 <br />g. Diameter and depth of holes; <br />h. Types of explosives used; <br />i. Total weight of explosives used per hole and maximum weight of explosives used per 8- <br />millisecond period; <br />j. Initiation system; <br />k. Type and length of stemming; <br />1. Mats or other protections used; <br />m. Type of delay detonator and delay periods used; <br />n. Number of persons in the blasting crew; and <br />o. Seismographic records, where required, including: <br />i. Type of instrument, sensitivity, and the calibration signal of the gain setting or <br />certification of annual calibration; <br />ii. Exact location of instrument and the date, time and its distance from the blast; <br />iii. Name of the person and firm taking the reading; <br />iv. Name of the person and firm analyzing the seismographic record; <br />v. The vibration level recorded. <br />cc: Tony Waldron, DBMS (via email) <br />Carl Mount, DBMS (via email) <br />crux 61es\My Documents 4 -19-06 tWrobins blasting review.doc <br />Page 26 of 73 <br />