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Wild Horse Reservoir Project West Test Quarry DRMS 111 Application <br /> Table 3-1: Dimensions of Investigation Items <br /> Item of Investigation Dimension <br /> West Test Quarry Section 1 2.53 acres <br /> West Test Quarry Section 2 2.72 acres <br /> New Access Roads Length West Quarry 9,000 feet <br /> Improved Roads Length West Quarry 11,000 feet <br /> Road Widths 15 feet <br /> Access Road Turnouts(25'x50') 3 each <br /> Processing Layout(not included in permit 22.1 acres <br /> boundaries) <br /> Existing road alignments will be widened to allow for 11.5-ft-wide articulated truck passage in a safe manner. The <br /> two-track median and possibly portions of the adjacent shoulders will be graded with a blade to 15 feet wide. <br /> Roads will be widened in the presence of a cultural resources surveyor and will be realigned at their <br /> recommendations. <br /> Temporary access roads with a target maximum slope of 10% will be constructed between the West Test Quarry <br /> and the designated layout and crushing area; however, slopes up to 25% may be considered for certain topology. <br /> Surface water runoff, if any,will originate from rainfall and/or ordinary construction activities and will be controlled <br /> via the use of open channel ditches, berms, pipe culverts, and other similar temporary works as required. Surface <br /> water management will be limited to the perimeter of the Common Processing Area and within the 15-to 25-feet <br /> shoulder of any dips in road crossings where heavy rains may wash out crushed stone. <br /> In lieu of widening the roads to 40 feet, turnouts will be constructed at regular intervals to allow two-way traffic. <br /> It is expected that three (3) turnouts will be constructed at a frequency of approximately one every 0.25 mile from <br /> the Common Processing Area to the farthest West Test Quarry section (Test Section 1). Turnouts will be <br /> approximately 25 feet wide (excluding the base 15 feet access road width) and 40 to 50 feet long. <br /> Internal quarry haul roads will be benched into quarry face slopes at safe locations, to be confirmed via slope <br /> stability analyses, and will be designed to achieve safe widths, heights, and curvature, with suitable edge <br /> protection. Stockpiling will not be permitted on top of the internal quarry haul roads. <br /> Where required, access roads will have safety berms installed in accordance with MSHA requirements.Access road <br /> widths noted above do not include widths required for safety berms which will be added to the road width. For <br /> the test quarry sections, suitable protection (such as boulders) will be installed no closer than 6 feet from the crest <br /> of excavations to form an effective, physical barrier around the excavation area to prevent falls of persons, <br /> machinery, or vehicles, where needed. Signage with safety information and contact information will be posted to <br /> warn site personnel and visitors of the construction area traffic.The edge protection will be maintained throughout <br /> the development of the test quarry and will be visually inspected by the site supervisor at least once per week. <br /> The expected grading plans for the test quarry sections are shown in the figures on the two (2) pages at the <br /> beginning of Exhibit C (Section 3.1). Based on lab test results of material mined and processed, minor <br /> modifications of the grading plans may be made. This includes deepening the excavation (while remaining above <br /> groundwater) and lengthening or narrowing the extents of the cut into the topographic highs (remaining within <br /> the 5.25-acre limits of disturbance) to reach better quality rock as observed after excavation of overburden and <br /> residual soil. <br /> TETRA TECH May 2024 12 <br />