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Newmont I County Road 82 Guardrail Analysis <br /> J Existing Conditions <br /> 2 Existing Conditions <br /> CR82 is a rural road with rolling terrain, vertically and horizontally. The posted speed along <br /> CR82 is 30 MPH (Design Speed of 35 MPH) with an assumed low volume Average Daily Traffic <br /> (ADT). CR82 along the south edge of road has a 7' shoulder beyond the edge of travel. Off of <br /> the shoulder is a roadside ditch that varies in width and depth and varying degree of side slope <br /> steepness, see Figure 2 which is a representation of the existing conditions. The ditch's <br /> intention is for conveying any roadway stormwater runoff and was designed in accordance with <br /> AASHTO Roadside Design based on a design speed of 35MPH and a roadside clear zone of <br /> 10' from the edge of traveled way. The secondary benefit of the roadside ditch is it provides a <br /> barrier to the WHEX highwall, but it is not the designed and intended purpose of the ditch. <br /> Following AASHTO Roadside Design for clear zone requirement is a nationally accepted design <br /> practice in which roadside slopes are designed to provide a roadside that is clear from obstacles <br /> and obstructions. In order to evaluate whether the WHEX highwall is an obstruction it must be <br /> assessed in accordance with the AASHTO Roadside Design Guide which provides guidance on <br /> when obstacles should be considered a roadside hazard. The WHEX highwall has an <br /> approximate depth of 370' and is approximately 150' from south edge of travel way. In <br /> accordance with AASHTO clear zone the WHEX highwall is well beyond the acceptable clear <br /> zone distance for a roadway of low volume and low speeds. The information gathered on the <br /> existing ground conditions for the roadway ditch and highwall depths is based on topographic <br /> features and a digital terrain model (DTM) provided by Newmont that was recently collected. <br /> Average 4:1 sideslopes with a minimum <br /> of 150' to the WHEX highwall. <br /> qr <br /> Vii � arr •< ;" r • , t <br /> .dF' . - <br /> O <br /> Figure 2 <br /> hdrinc.com 2060 Briargate Parkway,Suite 120,Colorado Springs,CO 80920-1045 <br /> (719)272-8800 <br /> 2 <br />