Laserfiche WebLink
Response: <br /> The blasting specifications will require blast monitoring seismographs consisting of <br /> a 3-axis velocity transducer, an air over-pressure transducer, and a data <br /> acquisition and storage device. The instruments will have a flat frequency <br /> response between 2 and 250 Hz with a maximum level of 148 dB for air <br /> overpressure. <br /> 8. Please provide a commitment to complete a blasting report for each shot. The <br /> report must be retained by the Operator for at least 3 years and be available for <br /> inspection by the Division on demand. The record shall contain the following data: <br /> a) Location, date and time of blast; <br /> b) Name, signature, and license number of blaster-in-charge; <br /> c) Identification, direction and distance in feet, from the nearest blast hole to <br /> the nearest potentially affected structure, such as any dwelling, school, <br /> church, or community or institutional building either: <br /> i. Not located in permit area; or <br /> ii. Not owned nor leased by the person who conducts the mining <br /> operations. <br /> d) Weather conditions, including temperature, wind direction, and <br /> approximate velocity; <br /> e) Type of material blasted; <br /> f) Sketches of the blast pattern including number of holes, burden, spacing, <br /> and delay pattern. Sketches shall al so show decking, if holes are decked to <br /> achieve different delay times within a hole; <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 <br /> explosives per 8-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, including: <br /> I. Type of instrument, sensitivity, and the calibration signal of the gain <br /> setting or certification an annual calibration; <br /> II. Exact location of instrument and the date, time and its distance from the <br /> blast; <br /> III. Name of the person taking the reading; <br /> a <br /> hdrinc.com <br /> 1670 Broadway,Suite 3400, Denver,CO 80202-4824 <br /> (303)764-1520 <br />