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IC- 10370R <br />AR D1S <br />Waste rock lithologies were consistent until a depth of approximately190 ft bgs, <br />wherein coarse gravel and boulders were encountered. At 190 feet, waste rock <br />lithology changed from silty, gravels and boulders composed of arkosic sand, shale, <br />and micritic limestone to pegmatitic granite boulders. At approximately 203 ft organic <br />matter including rotted wood and woody plant debris was encountered, cuttings <br />returned consisted of micritic limestone and developed silty soil, representing the <br />previous ground surface. A detailed well log for IC- 10300R is presented in Appendix <br />B. <br />The borehole was terminated at a depth of 210 ft. Well construction was completed <br />with a 20 ft screen. Sand pack consisted of 90% silica NSF -61 grade filter pack. A <br />hydrated bentonite plug was set above the filter pack and a high solids bentonite <br />(• 20% bentonite by weight) grout was emplaced above the bentonite plug. The <br />wellhead was completed with concrete and an 8 -inch steel well protective casing and <br />concrete apron. Detailed construction information is provided in Appendix B. <br />IC- 10370R is located approximately 67 feet to the west of the former location of IC- <br />10370. The borehole was spudded on August 27 2011. Drilling progressed regularly <br />through predominately silty, gravelly, and boulder -sized waste rock material, similar to <br />waste rock encountered at IC- 10300R. Compressed air was used until a depth of 85 ft <br />bgs. At lower depths, water injection was employed to remove gavel from the casing <br />and to ensure good return of cuttings. <br />From a depth of 180 ft to a total depth of 208 ft, no cuttings returned despite repeated <br />attempts to recover cuttings and advance the borehole. The Driller repeatedly <br />switched from compressed air - flushing to water injection to attempt to return cuttings, <br />but was unsuccessful. The loss of return from 180 to 208 feet is likely due to the drill <br />bit advancing through large boulders with significant void space. Drilling patterns <br />suggest the interception of boulder -sized material; bouncing of the drill stem despite <br />appropriate pull -back pressures, rig "chatter" — vibrations shaking the drill rig, casing <br />advance through voids, alternate rapid drill advance followed by slowed drilling, and <br />complete loss of injection water. <br />Waste rock lithologies were consistent to a depth of 180 ft bgs, prior to the loss of <br />return. Waste rock was composed primarily of arkosic sand, shale, and micritic <br />limestone with some pegmatitic granite gravel and boulders. A detailed well log for IC- <br />10370R is presented in Appendix A. <br />Pitch Reclamation Project - <br />Piezometer Replacement <br />Field Activities Report <br />g:lapmjeet\baniclelao000102.0001 pitch reclamation pmjechao102, bardck- pitchlpiezo replacement reporlingtdrafh far _pitch_piezo_replacemenl_pdd.doc 7 <br />