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Status Report; Robinson Seep Investigation <br />Climax Molybdenum Company <br />• Observations of outcropping Elk Mountain Porphyry in the vicinity of the western edge of <br />the cutoff wall (Figure 3.2a) indicate weathered, angular intrusive material ranging in size <br />from sand to boulder size. Observation of the angular nature of the weathered materials <br />would suggest that fracturing of the intrusive material occurred upon cooling and release <br />of pressure near the surface. <br />• The exposed Minturn Formation in the vicinity of the eastern end of the cutoff wall was <br />more competent than the intrusive material. However, fractures were observed in both <br />horizontal and vertical planes (Figure 3.2b), indicating the potential for groundwater flow <br />within this material. <br />• Iron precipitation and cementation was observed along fractures and bedding planes of <br />the Mintum Formation. <br />Table 3.1: Measured Field Parameters — Field Reconnaissance <br />Sample <br />Location <br />pH <br />Electrical <br />ID <br />Description <br />(S.U.) <br />Conductivity <br />(NS /cm) <br />Existing piezometer in <br />PZ -04 <br />unconsolidated <br />8.24 <br />1,940 <br />materials near toe of <br />Robinson Dam <br />Existing piezometer in <br />RL -17 <br />unconsolidated <br />8.02 <br />1,929 <br />materials near toe of <br />Robinson Dam <br />Old weir in stream <br />EVS -004 <br />above Eagle Park <br />7.78 <br />315 <br />Reservoir <br />Small spring directly <br />EVS -005 <br />behind old pump <br />8.15 <br />282 <br />house <br />Spring with iron <br />EVS -006 <br />staining north of <br />7.48 <br />1,491 <br />collection pond <br />Outlet of right (east) <br />abutment toe drain at <br />EVS -007 <br />collection pond near <br />7.51 <br />1,837 <br />base of Robinson <br />Dam <br />Notes: <br />1. Data collected June 18, 2013 <br />Tetra Tech, Inc. November 2013 26 <br />