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Daniels Sand Pit 2,Permit M-1973-007-SG; <br /> Response to"Approval Succession of Operators,Revision SO-2,with Stipulations" <br /> Page 2 <br /> approximately 392 ft from the road. Due to the distance from the mine workings, <br /> Milton E Proby will not be affected. <br /> ii. The July 26, 2019 Figure 2 cross-section submitted for the Bradley Road roundabout <br /> engineering assessment indicates the slope is 17.S:1 and 288'away. DRMS field <br /> observations suggest this slope is much steeper, causing uncertainty as to whether the <br /> DEM used in Google Earth to generate the profile is current. Please provide some <br /> evidence the DEM is current or resubmit the profile with the cross-section using a survey <br /> cross-section. Please be aware if any of the slopes are steeper than 3H.-I V, the DRMS <br /> may require a slope stability geotechnical analyses for this area meeting the MLRB <br /> Policy, Section 30. <br /> a. A recent survey provided in AutoCAD Civil 3D was utilized for the digital <br /> elevation model. Cross section#2 on Figure 2 shows the mining slope of 5.1 H:IV <br /> approximately 90 ft away from the roundabout. The slope does not exceed the <br /> 3H:1 V requirement per DRMS thus does not warrant a geotechnical slope <br /> stability analysis. <br /> iii. The July 26, 2019 Figure 3 cross-section submitted for Bradley Road engineering <br /> assessment is skewed, thereby not showing the steepest slope(s). The DRMS is also <br /> uncertain as to whether the DEM used in Google Earth to generate the profile is current. <br /> Please resubmit the profile with the cross-section perpendicular to the slope and provide <br /> some evidence the DEM is current or use a survey cross-section. Please be aware if arty <br /> of the slopes are steeper than 3H.•I V, the DRMS may require a slope stability <br /> geotechnical analyses for this area meeting the MLRB Policy, Section 30. <br /> a. A recent survey provided in AutoCAD Civil 3D was utilized for the digital <br /> elevation model. Cross section#1 on Figure 2 shows the mining slope of 1 H:1 V <br /> approximately 237 ft from the road. Due to the distance from the mine workings, <br /> Bradley Road will not be affected. <br /> iv. The July 31, 2019 Figure 1 cross-section submitted for the Bradley Road and Cassidy <br /> Street engineering assessment on indicates the slope is 12.75:1. DRMS field observations <br /> suggest this slope is much steeper, causing uncertainty as to whether the DEM used in <br /> Google Earth to generate the profile is current. Please provide some evidence the DEM <br /> is current or resubmit the profile with the cross-section using a survey cross-section. <br /> Please be aware if any of the slopes are steeper than 3H.•I V, the DRMS may require a <br /> slope stability geotechnical analyses for this area meeting the MLRB Policy, Section 30. <br /> a. A recent survey provided in AutoCAD Civil 3D was utilized for the digital <br /> elevation model. Cross section#3 on Figure 3 shows the mining slope of 6.6H:1 V <br /> which does not exceed the 3H:1 V requirement per DRMS thus does not warrant a <br /> geotechnical slope stability analysis. <br /> Please contact us if we can be of further assistance, or if you have any questions regarding this <br /> evaluation. <br /> Sincerely, <br /> BRIERLEY <br /> ASSOCIATES <br /> Creating Space Underground <br />