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CONTINENTAL MATERIALS CORPORATION <br /> judgement and experience in these matters.This being the case,the DRMS requests additional detail <br /> and rationale to support the determination of the 0.030g value for the seismic coefficient. <br /> Response: The pseudo-static seismic factor of one-half the peak ground acceleration is commonly used <br /> by the mining industry and was employed for the Pikeview reclamation project.This procedure is based <br /> on work by Hynes-Griffin and Franklin (1984).Their guidelines specify that the seismic factor of safety <br /> should be greater than 1.0, and the Pikeview seismic factors of safety all exceed 1.3. <br /> 41. Structure Demolition:Worksheet 2 in Exhibit L outlines demolition costs for onsite structures. It <br /> appears the concrete rubble is to be disposed of onsite in the fill. Please confirm this is the intent and, if <br /> so, describe how the rubble will be treated, controlled for size in the backfill, exposed rebar removed <br /> and discuss the timing of the demolition such that onsite burial in the backfill is achievable. <br /> Response: Concrete rubble may be generated during the demolition process or delivered to the site <br /> from offsite construction sites. Offsite material will be inspected to only contain concrete that is free of <br /> rebar or contaminates. Concrete shall be broken by mechanical breaker to suitable sized rubble. No size <br /> shall be greater than 12" in any dimension.All rebar shall be removed by equipment and hand labor and <br /> delivered to an approved recycle yard.Any concrete that cannot be cleanly separated shall be disposed <br /> of in an approved offsite land fill. Any non-concrete materials will be separated for salvage.All waste <br /> material will be taken offsite to an approved landfill. <br /> 42. Haul road reclamation:The reclamation narrative states newly constructed haul roads will be ripped <br /> prior to revegetation efforts. Please provide an estimate of temporary road areas to be ripped (total <br /> length and average width). <br /> Response: The exact location of access and haul roads are not shown on the figures at this time as this <br /> level of detail will be based on field observations during the execution of the Plan.As these roads are <br /> required, CIVIC will submit a Technical Revision prior to construction to incorporate new facilities <br /> showing the location and size (width and length) of each road into the Mining Plan.The roads will be <br /> constructed within previously disturbed areas.The haul road will likely be constructed with a 40-foot <br /> width, based on industry and MSHA standards and typical haul truck dimensions(40-ton truck is 11.26 ft <br /> wide)for two-way traffic.A gradient of 10% is also typical in the mining industry, which results in a <br /> 5000-ft long road for the 500-ft elevation change.Thus,there are approximately 200,000 sq.ft. (4.59 ac) <br /> to be ripped. <br /> 43. Onsite backfill:The SAR response indicates additional borrow area north and east of the shop area <br /> can supply sufficient backfill to achieve the required grades for reclamation and avoid the DRMS <br /> requiring bond to import backfill from offsite. Please provide a demonstration of sufficient backfill form <br /> this newly identified area. <br /> Pikeview Quarry Amendment 4, Response to Adequacy <br /> February 7, 2020 <br /> 14 <br />