Laserfiche WebLink
Chavers Mining Resource <br /> Groundwater Monitoring and Mitigation Plan <br /> January 2024 <br /> Page 5 <br /> within five (5) days of discovery to discuss the path forward. Potential mitigation measures may <br /> include: <br /> ■ Increase groundwater measurement frequency to determine if impacts are anomalous <br /> and/or temporary. <br /> ■ Determine if impacts to the hydrologic balance can be sourced to changes in the mining <br /> operation implemented at the Site. <br /> ■ Evaluate the existing data set to determine if any trends are present in up-gradient and <br /> down-gradient wells. <br /> ASCI will work with DRMS to assess whether impacts may potentially be adverse and/or if <br /> additional mitigation measures are appropriate based upon the situation encountered at that time. <br /> 3.1.4 Reporting <br /> Unless impacts to the hydrologic balance are identified as described in Sections 3.1.2 and 3.1.3, <br /> ASCI will continue to report groundwater level data to DRMS as supplemental information with <br /> the annual report for the Site each year as is the current practice. <br /> 3.2 GROUNDWATER QUALITY <br /> 3.2.1 Groundwater Sampling Schedule <br /> ASCI will conduct quarterly groundwater sampling at the Site for a minimum of four (4) <br /> consecutive quarters (i.e., I" Quarter 20224 to 4ch Quarter 2024). For each sampling event, <br /> groundwater samples will be collected from each of the five (5)monitoring wells (MW-2 through <br /> MW-6) and submitted for laboratory analysis. In addition, a duplicate quality assurance/quality <br /> control(QA/QC)groundwater sample will be collected from one of the monitoring wells per event <br /> (six [6] total samples per event). Additional QA/QC samples (e.g., method blanks, laboratory <br /> control samples, matrix spikes,etc.)will be analyzed by the laboratory during batch analyses with <br /> results provided in the final laboratory reports.Any change to the groundwater quality monitoring <br /> schedule (i.e., reduction in sampling frequency) will be submitted to DRMS via Technical <br /> Revision for approval prior to implementing. <br /> 3.2.2 Groundwater Sample Collection Procedures <br /> Prior to sampling each well, depth to groundwater and total well depth measurements will be <br /> collected using a water level indicator to the nearest 0.01 foot. Groundwater will then be purged <br /> from the well utilizing a submersible pump with dedicated tubing or hand-bailed with a dedicated <br /> bailer. All non-dedicated equipment used to collect groundwater measurements and samples will <br /> be decontaminated with a detergent (e.g., Alconox® Detergent Powder) and distilled water <br /> solution prior to use at each monitoring well.A new pair of clean,disposable nitrile gloves will be <br /> utilized for sample collection at each well.Purged water will be collected in five(5)gallon buckets <br /> where water quality parameter readings for temperature, pH, specific conductivity, and total <br /> dissolved solids (TDS) will be collected. The total purge volume from the well will be recorded. <br /> Once groundwater stabilization is achieved (i.e., three consecutive readings within ten percent of <br />