2017-03-24_REVISION - M1977004 - Laserfiche WebLink

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1� Mr. Dustin Czapla n Page 4 of 8 u second platform on the 10300 -elevation access road associated with Indian Rock n Dump injections (Figure 4). Each platform will include the following elements: �J o Grading/leveling of an area approximately 25 ft x 50 ft. o Installation of 20 ft x 30 -ft concrete pad on leveled area, to accommodate a shed and open storage area enclosed within a fence. Purchased non- reactive gravel may be emplaced on the remainder of the leveled area. o Storage of injection/recirculation equipment (covered and uncovered), a including but not limited to: plastic tanks/totes, secondary reagent containment, generators, and associated piping, valves, and controls. • Additional concrete pads with fencing will be constructed to house water storage tanks, including one along an access road on the south wall of the North Pit (Figure 3) and one adjacent to RD -01, RD -02, and RD -03 on the Indian Rock Dump (Figure 4). Approximate pad dimensions are shown in the figures. n • High-density polyethylene (HDPE) plastic piping associated with water conveyance and electrical conduits will run between the recirculation wells and injection platforms: o Piping running along access roads and on steep grades will be maintained aboveground, temporarily secured to the ground using stakes and wire harness. o Piping on steep grades will be underlain by geotextile fabric to prevent enhanced erosion resulting from water channeling along piping runs. This fabric will be applied directly to the ground surface and tacked in place Q using metal stakes. Piping will then be installed directly in contact with the fabric. o Piping will be buried or transmitted through an installed culvert at locations where piping crosses existing access roads. o Piping running parallel to access roads and/or drainage ditches will either be placed on geotextile fabric and secured adjacent to the roadstditches or Dplaced into the drainage and away from roadways for safety purposes. o Piping will be HDPE welded, flanged, or a combination. ETC Pilot Testin aAn intermediate -scale field implementation ETC will be constructed in 2017, which will involve mechanical trenching/excavation and emplacement of reactive media for removing dissolved uranium from groundwater and redirected surface water. This ETC will be staged immediately to the east of monitoring point TCC, adjacent to Tie Camp drainage (Figure 6). Surface disturbances associated with this installation include the following: • Mechanical excavation within a rectangular zone approximately 20 ft x 60 ft, to a maximum depth of approximately 8 ft. Displaced alluvium will be placed adjacent to the excavated area for future use when needed. • Emplacement of above ground conveyance piping leading into and out of the ETC, directing water to/from Tie Camp drainage. 0 Homestake Mining Company 4, PO Box 40, Sargents, Colorado 81248 it