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2.3.5 Secondary South Trending Joint Set <br /> The secondary south trending joint set was observed at different locations throughout the <br /> South Quarry during Annual Report mapping to have average strike values ranging from 100 <br /> to 225 degrees and average dips ranging from 40 to 88 degrees. <br /> 2.3.6 Fault and Associated Shear Zone <br /> The fault in the South Quarry is not readily observable, but can be interpreted to have a strike <br /> of about 320 degrees on the east side of the South Quarry and a strike of about 270 degrees <br /> on the west side of the South Quarry. The fault dip is interpreted to be about 70 degrees to <br /> the south, and that a low-strength rock zone extends about 100 to 150 feet on either side of <br /> the fault. There is also sillimanitic gneiss present in the vicinity of the fault, but does not <br /> appear to be associated with the fault, as previously reported. <br /> 2.3.7 Rock Mass Ratings <br /> RMR values are developed for rock mass in the South Quarry based on observed conditions <br /> of scanlines during Annual Report mapping, and are included in Appendix E. RMR values <br /> were developed by Bieniawski to classify structural features of exposed rock <br /> (Bieniawski, 1976). RMR methodologies quantify mapped rock mass by assigning a number <br /> to exposed rock in the categories of rock discontinuity, discontinuity spacing, favorable or <br /> unfavorable discontinuity orientation, the discontinuity persistence, discontinuity aperture, <br /> feature roughness, estimated RQD, intact rock strength, weathering, and presence of <br /> groundwater. The numbers assigned to the rock from each category are summed to produce a <br /> final RMR value. The final RMR value is then used to qualify the rock strength as very good, <br /> good, fair, poor, and very poor. <br /> RMR values developed during Annual Report mapping classified observed rock mass in the <br /> South Quarry as poor or fair to good rock. <br /> 2.3.8 Groundwater <br /> No flowing groundwater was noted within any of the highwalls during annual report <br /> mapping. The groundwater phreatic surface is considered to be below the area of impact and <br /> was not included in out analyses. <br /> Aggregate Industries Morrison Quarry GEI Consultants, Inc. <br /> South Quarry Highwall Design Technical Revision 9 August 2017 <br />