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To: Mr. Peter Hays <br />Date: March 21, 2022 <br />Page 9 <br /> <br /> 20220314_DRMS_Adequacy_Review_Response_MASTER.docx <br /> <br />Response 16 <br />Field parameters are not measured while purging because over three-borehole volumes are <br />removed from the monitoring well during the sampling events. Field parameters are taken <br />at the time of sampling and recorded on the field sheets. <br />Comment 20 <br />In Appendix D, page 15-16, the Applicant states groundwater level and quality samples <br />will be collected from all monitoring wells on quarterly basis. After one year the Applicant <br />may approach the Division seeking to modify the plan along with justification for the <br />modification. In the Groundwater Sampling and Analysis Plan Section 5.0, page 2, the plan <br />states groundwater quality samples will only be collected from select wells and those wells <br />are listed in Table 1. Table 1 only lists five wells to be sampled. Please explain the <br />discrepancy and update accordingly. The Division is expecting all monitoring wells to be <br />sampled on quarterly basis. <br />Response 20 <br />We revised Appendix D to reflect that we will collect water levels from all monitoring <br />wells monthly, and water quality samples from the five wells listed in Table 1, quarterly. <br />We cleaned up language in Appendix D in hopes of clearly showing the purpose of each <br />monitoring well. Attachment 10 provides this revision. <br />DUNN PIT (PERMIT NO. M-2021-059), SECOND ADEQUACY <br />REVIEW ADDRESSING REPONSES FROM TELESTO <br />SOLUTIONS, INC., 21 FEBRUARY 2022 – MEMO FROM ROB <br />ZUBER, DRMS TO PETER HAYS, DRMS <br />Comment 3 <br />The Telesto report states that, “The flood stage during the 100-year event is below the <br />elevation of the bridge girders for both the railroad and highway bridges.” Does the 1D <br />model confirm this statement? If so, please provide an image from the model results (the <br />cross section at the upper end of the railroad bridge) illustrating this point. If the 1D model <br />does not confirm this statement, please explain the possible discrepancy between the model <br />and the statement. <br />Response 3 <br />The 1D model confirms this statement. Please see the figures in Attachment 11.