2017-03-24_REVISION - M1977004 - Laserfiche WebLink

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Mr. Dustin Czapla Page 2 of 8 construction of field implementation -scale reagent injection/recirculation platforms j� in each area (including concrete pads, sheds, and fencing). �j • Installation of one pilot -scale engineered treatment cell (ETC) to achieve uranium load reduction along Tie Camp Drainage. 0 • Implementation of active management strategies, should they become necessary, to control "treatment residuals" (i.e., residual dissolved constituents present in water resulting from reagent usage) in surface water upstream of the CDPS permit a outfall (SW -33). In particular, residual phosphate in surface water resulting from phosphate injections will be managed if needed. HMC hereby requests a Technical Revision to the Pitch Reclamation Project reclamation permit No. M-77-004HR. The following sections provide facility information, the proposed activities to be conducted in 2017 to support alternatives advancement and design, and information on reclamation of disturbed areas following LPL implementation activities. Additional details associated with former field activities are provided in the 2016 Alternatives Analysis Report, submitted to the Water Quality Control Division, the U.S. Environmental Protection Agency, and DRMS on December 6, 2016 (Arcadis 2016). In advance of the 2017 uranium load reduction field activities, approvals will also be requested from the Water Quality Control Division as required by the CDPS permit and the United States Environmental Protection Agency for Class V aquifer remediation injection well "authorization by rule" in accordance with Title 40 Code of Federal Regulations (40 CFR) Sections 144.24 and 144.84(a). In addition to disturbances associated with LPL activities, augmentation of the approved seed mix for establishing vegetation is explained as part of this Technical Revision, as (� described below. U Drilling and Recirculation/Monitor Well Construction Up to eight new recirculation/monitoring wells are proposed for use in the injection, recirculation, and/or monitoring of phosphate -based reagents and conservative tracer(s) 0 at the Pitch Reclamation Project. Three of these monitoring wells will be completed near the underground mine workings (Figure 3) and five monitoring wells will be completed in the Indian Rock Dump (Figure 4). Along with recirculation/monitoring well installation in the underground mine workings, one additional "exploration" borehole will be drilled to characterize the Erie Drift (corresponding to the 10,500 -level underground mine workings, approximately 100 feet [ft] above the water table; Figure 3). The wells will be constructed in relatively flat areas adjacent to existing access roads, although surface grading may be required to provide adequate drill pads. The wells will be completed in June 2017. The exploration borehole will be plugged/abandoned and reclaimed immediately following 0 drilling. The drill hole for proposed well P-14 will be located to intersect the Erie Drift for characterization purposes, although the well screen will be placed deeper (at approximately 10,300 ft to 10,350 ft elevation). If it is determined that void space encountered during drilling at this location would complicate well completion, then this 0 Homestake Mining Company + Po Box 40, Sargents, Colorado 81248 m