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w <br /> Review of Blasting Operations at Robinson Brick Company's Siloam Cla} &tine <br /> 2.0 BLASTING IMPACTS ANALYSES <br /> When explosive charges detonate in rock, most of the available chemical energy is used in <br /> breaking and displacing the rockmass. However, some of energy is kinetically released in the form <br /> of vibration causing strain waves, airborne noise and concussion and flying rock. If uncontrolled, <br /> these forms of blast energy can cause injury and damage property. <br /> In this section, GEOTEK evaluates all the potentially damaging effects that blasting might have on <br /> people, animals and property on and near the Siloam Clay Mine. GEOTEK also recommends <br /> specific measures that can be employed to mitigate reviewed blasting impacts. <br /> 2.1 Impacts of Blast-Induced Ground Motion and Fracturing: <br /> This purpose of this section is to evaluate the relative potential for all forms of damage that might <br /> occur due to blast-induced ground motion or radial cracking. This section examines their effects <br /> on neighboring property and utility lines and pipes. A short review of blast vibration dynamics is <br /> also included at the beginning of the section to acquaint the reader with various ground motion <br /> measures that are used in structural damage evaluations. <br /> The following blast-motion impacts are analyzed in the indicated subsections: <br /> Damage Concern: Section: <br /> Structural Damage............................... 2.1.2 <br /> Buried Utilities Damage....................... 2.1.3 <br /> Water Well Damage ............................ 2.1.4 <br /> GEOTEK also reviews and comments on the appropriateness of currently proposed blast control <br /> measures and in some areas, GEOTEK recommends additional controls. <br /> GEOTEK&Associates, Inc. Page 3 January 99 <br />