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Andy Rodriguez <br /> March 23,2020 <br /> Page 4 of 6 <br /> Rule 3.6.1(1)of the Minerals Rules and Regulations of the Colorado Mined Land Reclamation Board for the <br /> Extraction of Construction Materials states: "Disturbances to the prevailing hydrologic balance of the affected <br /> land and of the surrounding area and to the quantity or quality of water in surface and groundwater systems both <br /> during and after the mining operation and during reclamation shall be minimized..." To address these concerns,a <br /> Groundwater Mitigation Plan was provided by the operator to supplement the information provided for exhibit G. <br /> After reviewing the provided Groundwater Mitigation Plan DBMS has the following comments and additional <br /> requirements. <br /> The Lee Well is not shown on the map provided. <br /> Neumann Well is referred to in text of plan,but not shown on map. <br /> Rindour Well is shown on map,but not referred to in the text of the plan. <br /> Please provide a table/figures showing all available monitoring data and trends over time for the eight wells listed, <br /> not just average values. <br /> DBMS will require 2 more groundwater monitoring wells adjacent to Cell 1; one on the west side/southwest <br /> corner,and one near the southeast corner. These wells should be installed and made part of the monthly <br /> groundwater level monitoring program as soon as possible. <br /> DBMS will also require the permittee to attempt to document background conditions in the five listed domestic <br /> alluvial wells prior to initiating dewatering activity associated with AM03. In order to minimize the impacts to <br /> the hydrologic balance,it is vital to determine what the existing"pre-mining"conditions are for wells that may be <br /> impacted. This data is especially important for this site,where mining activity has already been documented to <br /> have potential adverse impacts on nearby alluvial wells. For the five listed domestic wells,DRMS will require <br /> that the permittee attempt to obtain the following data,in addition to whatever basic well construction data is <br /> currently available: <br /> Total well depth, <br /> Depth to static water level, <br /> Depth of pump intake <br /> Conduct pump test to determine well yield <br /> Conduct analytical sampling of all Domestic Drinking Water parameters <br /> All data collection will be completed at the permittee's expense.Data will be provided to DBMS and the well <br /> owner upon their request. If a well owner chooses not to allow the permittee access to collect the above data,they <br /> should be provided with a form that they can sign and date to document that they have been provided with an <br /> opportunity to have their well characterized at the permittee's expense,but have chosen to decline to participate. <br /> If during the course of mining or reclamation complaints from a well owner are received by the permittee,the <br /> permittee will commence an evaluation and investigation,including providing replacement water to the well <br /> owner if necessary,within 48 hours. DRMS shall be notified within two business days of the complaint and the <br /> proposed initial steps for the evaluation of the complaint. A written report will be submitted to DBMS within 30 <br /> days detailing the information collected during the investigation of the complaint, and proposed mitigation <br /> activity, if required. Please make the appropriate edits to the Groundwater Mitigation Plan,and acknowledge the <br /> additional DBMS requirements listed above. <br />