Laserfiche WebLink
Zones 2 & 5, as identified to the Division in Technical Revision 02 JR 02), had no earthwork <br /> conducted on them. They are therefore not discussed in this as-built. <br /> Zones 3B and 4 saw the installation of subgrade drainage pipe in addition to earthwork for <br /> regrading. These pipes were installed in the locations delineated on Map C-6 and on Figure 2 and <br /> Figure 5. Map C-6 are located in Appendix 4. <br /> 2. Repair and Regrades <br /> Each of the zones that were repaired or regraded involved excavation of material,material <br /> identification by onsite technical support from Ground Engineering, and then placement of <br /> material in final slopes with compaction checks conducted by Ground Engineering. The results <br /> of all compaction tests are in Appendix 1. Placed material generally met compaction standards as <br /> required in TR 02 (Table 2). Material was placed in 12 inch or thinner lifts. <br /> Table 2 —Compaction Criteria from TR 02 <br /> Material Class Portion of Dry Density <br /> Granular materials 95%+ 3% <br /> ----- ------- - -------- -- ---...__. <br /> GP,GW,GM,GX,SP,SW,SM,or 92%+ 3% <br /> SC soils <br /> ML,MH,CL,or CH soils 95%+ 2% <br /> Map C-613 shows cross sections in each zone that were used in slope stability monitoring. <br /> 2.1 Zone 1 <br /> The slide material in this zone was built into a permanent storage pile following the slide in <br /> 2018. This pile has final slopes of 3H:1 V or shallower and will be revegetated on the slope face. <br /> The top of the pile will be graded flat for use as a stockpiling area by APC. The final grading of <br /> the zone will lead to a general drainage direction to the north,towards a sediment pond that was <br /> installed in 2019. <br /> This zone has been graded to the specification as approved in TR 02.No additional slope <br /> stability analysis is necessary. Map C-613 shows its cross section for reference. <br /> 2_2 Zone 3A <br /> Existing tailings material was shifted downslope in a general regrade for the final slope. The <br /> final grade was defined using the cross sections X3 and X4 from the approved TR 02. The tops <br /> of these cross sections were used to develop a grade model that was staked onsite and built to. <br /> Since this zone has been graded to the specification as approved in TR 02.No additional slope <br /> g p PP e P <br /> stability analysis is necessary. Map C-613 shows its cross section for reference. <br /> 2.3 Zone 3B <br /> Construction of Zone 3B consisted of two primary parts: installation of the subgrade drainage <br /> pipes and construction of the final grade fill embankments or buttresses. The goal of the buttress <br /> Ralston TR 03 4 Greg Iw wki and As­m s,PUA' <br />