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Martin Marietta Materials <br /> Spec-Agg 2017 Annual Report <br /> We also recommend that known faults are tracked and observed in new exposures to confirm orientation <br /> and character for supplemental stability analysis, as needed. We expect the southern fault identified by <br /> Gable (1968) and in previous years site visits (Figure 3) may be exposed in other locations as excavation <br /> continues in the Southern Expansion Area. Additionally, the unmapped fault generally located in the <br /> central portion of the quarry may be exposed for mapping in the future. As recommended in the previous <br /> reports, evaluations will be conducted during future investigations to assess whether or not any of the <br /> foliation sets (F-1 through F-3)are caused due to localized faulting that may have resulted in "structural <br /> regions"that have created areas in which the varying orientation of the foliation planes occur. These <br /> questions will continue to be addressed as more data is collected. <br /> Localized raveling, especially along the south walls, is likely to continue. Continuation of the safety- <br /> minded policies already in place, which limit the height of the exposed highwalls as well as the <br /> reclamation of exposed highwalls as soon as possible following blasting and rock haulage, will aid in <br /> minimizing the potential for instabilities to occur. The quarry walls appear to be relatively dry and <br /> noticeably absent is any major seepage. However, any major changes in ground water seepage or <br /> hydrostatic conditions observed either from the quarry walls or during production drilling activities should <br /> be characterized and reported to Lachel. <br /> Lastly, the impounded water in the Main Pit creates no immediate concerns, but a rapid drawn-down of <br /> the water level could create a potential for slope instabilities. Any plans to change or rapidly vary the <br /> water level in the Main Pit should be relayed to Lachel for an evaluation of the effects on the slopes' <br /> stability. <br /> February 27,2017 Page 12 Lachel &Associates, Inc. <br /> Project 16C64003 00 ©2017 All Rights Reserved <br />