2024-12-19_PERMIT FILE - M2024059 (6)

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1.2.1. Monitoring Well Installation All wells being used for monitoring will be constructed by a licensed contractor following the State Engineer's Office (SEO) guidelines. Construction information and lithology for each well will be provided in Appendix 3 under the associated CDWR permit documents, after construction. Other characteristics of the wells are provided in Table 1 above. Table 2 below lists the permit CDWR permit numbers for each of these wells. Table 2— CDWR Well Permits ID CDWR Permit No. Use GW-1 TBD Monitoring GW-2 TBD Monitoring GW-3 TBD Monitoring 1 .2.2. Baseline Groundwater Quantity The baseline water level will be quantified with at least 15 months (once a month for five quarters) of static water level measurements at the four sampling locations. It will be taken monthly at wells GW-1, GW-2, and GW-3 for baseline characterization. The water level will be measured using depth measuring equipment such as a sounder from the top of the well casing, using the sampling methods outlined later in this plan. Data will be recorded in table and graph format in Appendix 1. This data will be analyzed to show the water level against time in graph format. A potentiometric groundwater model will be developed from this quantity data to ensure that POC monitoring is in the correct location to characterize downstream water qualities. Quantity sampling will continue following the start of mining on a monthly basis. Results will be reported to the DRMS in table and graph format with the annual report. 1 .2.3. Baseline Groundwater Quality The baseline water quality will be quantified with at least five quarters of water quality sampling at the three sampling locations. Field and laboratory samples will be taken quarterly at groundwater wells GW-1, GW-2, and GW-3. Quality sampling will meet Regulation 41 standards and parameters using the sampling methods described in this plan. Data will be recorded in a table and reported in Appendix 1. 2. Predicted Impacts to Hydrologic Balance Predicted impacts to the hydrologic balance are not anticipated to occur at the North Hangs site. Groundwater will be able to flow freely through the pit so quantity should not be affected. The only potential impact could be to the groundwater quality, however, this is unlikely as the pit acts as a gravel filter preventing pollution from travelling in the aquifer. Additionally, all discharges from the pit will be permitted and sampled for quality. North Hangs Mine GW Monitoring Plan 6 U Lewicki&Associates December 2024