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To:Jared Ebert <br /> Date: February 27,2018 <br /> Page 4 <br /> 3. Cobalt 0.05 <br /> 4. Copper 0.20 <br /> 5. Lithium 2.50 <br /> 6. Manganese 0.05 <br /> 7. Vanadium 0.10 <br /> 8. Zinc 2.00 <br /> iii. What is the source of the benchmark values for calcium, magnesium, potassium, <br /> and sodium listed on the sampling matrix. <br /> iv. The "reporting limit" column in the sampling matrix table should be titled <br /> "standard"or "benchmark". The sampling matrix table should include a column <br /> that provides the method detection level (MDL) or method reporting level (MRL) <br /> for each analyte/method. <br /> v. LRM indicates on Page 6 of Attachment 3 that they may request to the Division to <br /> begin mining/dewatering operations after collecting three quarters of water <br /> quality sampling if the data indicates no reportable differences to analyte <br /> detection levels are found. LRM must submit a technical revision and receive <br /> approval from the Division to revise the baseline water quality sampling plan to <br /> sample less than five quarters. Please acknowledge. <br /> vi. LRM indicates on Page 7 of Attachment 3, regarding continued water quality <br /> sampling during active mining that they may desire to reduce the frequency in <br /> groundwater quality monitoring after three years of mining if the data collected <br /> shows that no significant change to background water quality has occurred. <br /> Similar to the item above, LRM will need to submit a technical revision and <br /> receive approval from the Division to modify the frequency of ground water <br /> quality monitoring. Please acknowledge. <br /> vii. LRM's Groundwater Study model shows the potential for groundwater mounding <br /> to the west of the site during the mining operations and after reclamation. <br /> Section 7.1.3 of the Groundwater Study indicate that if monitoring results show, <br /> in areas that the model predicts are a potential for mounding and flooding of <br /> neighbor's property occurs, LRM will take action to assess the mounding issue <br /> and may initiate mitigation measures. Given the natural highwater table of the <br /> area and the location of adjacent residences with crawl spaces, LRM cannot wait <br /> until off-site flooding occurs to take mitigation measures to address groundwater <br /> mounding. Please commit to initiating immediate mitigation measures should the <br /> two foot trigger level be breached. Also, please commit to notifying the Division <br /> within 24 hours if a trigger level for either drawdown or mounding is observed. <br /> Response 39c <br /> A revised Groundwater Sampling and Analysis Plan is attached (attachment 1) that <br /> contains the information requested. The attachments to the plan that were not <br /> changed are not included. <br /> Response to DRMS Adequacy Review 3 comments TEL E S T O <br />