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To: �1r. P.t�r Ha�s <br /> [)at�: �Iarch �-4. ?0�' <br /> Pagc ? <br /> Comment 20 <br /> DRMS Follow-up: Please provide an explanation as to why the Applicant is not going to <br /> sample all monitoring wells at the site and only a sub-set? The Division is expecting all <br /> monitoring wells at the site to be sampled on a quarterly basis. <br /> Response 20 <br /> The monitoring plan is based upon the general flow directions monitored across the site <br /> and the initial monitoring results. Our goal with the monitoring plan is to 1) monitor <br /> groundwater flow directions, and 2) monitor groundwater quality up and down gradient <br /> from our planned mining activities. To meet our first goal, we infer groundwater flow <br /> directions from the water level measurements as shown in Figure 1. To meet our second, <br /> goal we identify up and down gradient wells from Figure 1 and choose representative wells <br /> to sample. <br /> Our upgradient wells measuring up gradient groundwater are: MW-01, MW-02, MW-03, <br /> MW-06 and MW-09, and our downgradient wells are: MW-OS (groundwater discharges to <br /> the river nearby), MW-07 and MW-08. MW-04 is internal to the site and will be mined <br /> out during mining of Cell 1. MW-10 is side gradient and is predicted to remain so during <br /> mining and after reclamation. Because the major ion and trace metal chemistry of the <br /> groundwater in the upgradient wells are similar, we chose one well north of the river and <br /> one well south of the river to represent upgradient conditions. Thus, we have good <br /> representation of groundwater chemistry both up and down gradient of the planned mining <br /> area (two wells north and three wells south of the river). Because we monitor every well <br /> for groundwater levels,we will detect any drastic changes in flow directions, and can alter <br /> the sampling locations if necessary. However, based on experience, model predictions, <br /> and the mining plan,we do not anticipate a drastic change in which wells represent up and <br /> down gradient groundwater conditions. <br /> 20220313_DRMS 3rdHydro%gy_Adequacy_Rev�etiv_Response <br /> .docx TELESTO <br />