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Table 3. OSM Peak Particle Velocity Limits <br /> Lower frequency limit of <br /> measuring system (Hz f 3 dB) Maximum level(dB) <br /> 2 Hz or lower—flat response 133 peak <br /> 6 Hz or lower—flat response 129 peak <br /> Seismic instrument(s)will be used to measure ground vibration and peak particle velocity. <br /> Measurements will be taken at the closest significant structure(home, building, road, well, etc.). <br /> Monitoring equipment will have an upper frequency range of 200 Hz or greater. The site will <br /> utilize the OSM maximum peak particle velocity limits shown in Table 2. All attempts will be <br /> made to keep peak particle velocities well below the proposed maximum allowable limits. <br /> All blasts will be monitored with three separate monitoring units made up of a seismograph, <br /> geophone (seismic unit), and a microphone. The locations of the units will be at the intersection <br /> of the property line and a line between the center of the blast and the following significant <br /> structures: <br /> • The cluster of structures —1,000 feet south of the permit boundary along I-70. <br /> • State Highway 119 near the outfall of Russell Gulch into the North Fork of Clear Creek. <br /> The nearest parcels with residential structures are owned by the Young Ranch LLC, Bell Bruce <br /> Trust, and 2056 Property Ventures LLC and are approximately 1,700 feet from nearest portion of <br /> the quarry, the southern-most DRMS boundary. <br /> Mitigation Plan for Complaints <br /> 1. Structure Complaints <br /> If after blasting actives are completed, a neighbor discovers potential damage to their structures <br /> (i.e. foundation or wall cracking, broken windows, rock falls, etc.), the neighbor should notify <br /> the operator. A complaint may also be filed with the Colorado DRMS. An operator's <br /> representative will typically visit the structure to start the investigation within 24 hours. Based on <br /> the results of the initial investigation,the operator will arrange for additional data collection. The <br /> Young Ranch Resource <br /> November 2020 21 Gnk Lcwicki and Associates,I'I,L(' <br />