2021-09-27_REVISION - M1990057 - Laserfiche WebLink

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Mr. Dustin Czapla 16 CDRMS September 24,2021 unrelated to the Mill's geologic strata. If the well is found, and access is granted, CJK will obtain a sample per CJK sampling protocols (See Appendix 21-9 in permit application). The operation has adopted a health and safety program, a mill emergency response plan (See Section 21, Exhibit U - DMO Environmental Protection Plan Section 21.6, Rule 8, Emergency Response & Management Plan, and a Cyanide and Hazardous Chemical Emergency Response Plan attached Appendix 23-1). 25. The TSF will be constructed with a leak detection system. What backup protective measures will be in place to prevent migration of contaminants into the ground water system should a leak be detected? Response In the unlikely event of a leak from the Mill, an investigation of potential sources (onsite and offsite) (natural and induced) and the potential causes for deviations from baseline water quality characteristics will be performed. Surface and groundwater samples will be obtained. Tanks, pipes, conveyance systems, pads, pumps, containment systems etc. will be investigated to determine if the facility engineering components are functioning as designed. If a leak is confirmed, CJK will obtain CDRMS approval (Technical Revision) to implement corrective action. In the event, the leak cannot be structurally or technically associated with the Mill or TSF, a human health risk assessment may be undertaken. If a leak is detected via the TSF sump, the liquid will be sampled and tested to determine the source. If the signature indicates the leak came from the TSF, then sources will be investigated, and the liquid from the sump will be pumped out of the sump into the TSF. If the chemical signature indicates ground water, it will be pumped into TSF. Reference: Cyanide and Hazardous Chemicals Emergency Response attached Appendix 23-1. Mill Facility The Division considers the mill facility to be an Environmental Protection Facility (EPF). As such, the application will need to address all sections of Rule 6.4.21 applicable to the mill. Please provide the following: 1. Mill Facility Construction Details —should include: a. General Design Summary Response The Mill is generally a metal post and beam structure bearing on 10-inch concrete foundation walls, which in turn bear on spread footings. Two additions, the office area and the leaching room were constructed more recently and consist of wood framing on a conventional spread footer foundation. The main structure, built in 1988, has stood up well, with little to no cracking. From soils reports for the TSF, the supporting soils have high bearing pressures, contributing to a well-built structure. During construction of the office and leaching room construction additions, the soils directly adjacent to the structure were observed, and were consistent to the TSF soils report.