2019-10-18_REPORT - M1978208 - Laserfiche WebLink

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6. The quarry is located in an area well outside any existing Geologic Hazard Overlay District Zoning Maps. There is no evidence at the site of slope failure, landslide areas or subsidence. Rockfall areas exist as part of the active mining operation within areas that will be completely mined out before establishing final benches and highwalls. 7. Bedrock exposures at the site primarily reveal foliation jointing subparallel to metamorphic compositional layering. True so,we have A, B sets'(almost)The foliation strikes northwest and dips from shallow to moderately steeply to the northeast,generally into the hillside that is being mined: Yes it does Secondary joints that are steeply dipping to sub vertical also occur. Finally,tertiary joints exist that dip northwest to southwest, or generally out of the hillside that is being mined. But=they, lgtiv-1 ri*mi fFect of .thesciverall geotectinical composition of title-slope We also enmployed some innovative out of the box techniques related to the blasting patterns and so on to accomplish a more ragged, `natural' looking appearance-that differs from the more artificial half-casts you typically see in a-pre-split pattern,commonly employed n locations attempting to improve recovery ratios. --_i __. -, _u--v_- - -x_uraggdi__A much-more natural appearance the final We didhis becauset enco _: conf giaratlon that:alloWed`and encoiara e_d re=t abitation't?y nesting s ec s aril others in the"portion's of the face that are nof_being worked—may not want to put this in there. ** ASK FOR HELP HERE 8. Analysis shows potential slope failures if the slope were steepened to 1:4 from the originally proposed 1:2 configuration, but acceptable slope conditions for a quarry development if steepened to 1:3 as Elk Creek is presently proposing(12 ft benches by 35 ft highwalls = 1:2.9),NOTE these went to 40-45 ft benches and the new quarry will have anywhere from 50 to 35 ft benches 9. For the proposed 1:3 slopes,our analyses indicate that sliding failure is kinematically admissible only on the westerly dipping joint set, but that this is mechanically admissible only in the upper weathered rock. WHIH DOESN'T EXIST ANYMORE-BOYS-AND GIRLS—can you see where we are headed with this thing Toppling failure is not kinematically admissible for any of the sixjoints analyzed. Several wedge failure modes are kinematically and mechanically admissible in the upper weathered rock, but not in t_heyg mass. YAAAAYI I I The upper weathered rock should be laid back to 1:1. Tliere;isn't any - however I concur in that I am trying to achieve a slightly more natural aesthetic in this thing a that considers a more of a flute type appearance and has a demonstrable`flare on the upper echelons,where such moderate weathering does exist or is exposed at any level.So it ends up having a slight Limited individual highwalls is usually considered acceptable in quarry operations. 4 Rock Classification Systems for Engineering Purposes; Louis Kirkaldie, Editor;ASTM STP 984;1988.