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LEGEND <br /> r Permit Boundary <br /> Mining Boundaries <br /> Sampling Well Location <br /> GW-1 <br /> r <br /> Phase 3 <br /> ! . <br /> Phase 4 <br /> a <br /> s Phase 1 <br /> s <br /> a � <br /> %Y Phase 2 <br /> d 111 <br /> Figure 1 —Groundwater Sampling Location <br /> This groundwater sampling location is downstream of the mining operation as the waters of the <br /> Gunnison River aquifer move towards the northwest. No upstream sampling location is <br /> necessary as baseline conditions will be defined from the downstream location prior to mining. <br /> 1 .2. Sampling Frequency <br /> Baseline groundwater sampling will take place prior to mining of Phase 3 and 4. Phase 3 and 4 <br /> of mining is anticipated to start in the Spring of 2033, however this timeline is variable based on <br /> the mining of Phases 1 and 2. Sampling will begin approximately two quarters in advance of any <br /> disturbance to the Phase 3 and 4 area. One sample per quarter will be taken to define the <br /> baseline conditions of the groundwater downstream of the mining operation. <br /> Long term groundwater sampling will take place while Phase 3 and 4 are being mined. This will <br /> occur once per quarter throughout the year. The frequency of sampling for long-term monitoring <br /> may be decreased in the future if no adverse water quality impacts are detected within the first <br /> few years of mining of Phase 3 and Phase 4. If the frequency of sampling is decreased, it will <br /> return to once per quarter under two conditions: <br /> 1) Adverse water quality impacts have been detected in the groundwater. <br /> Delta Paving Gravel Pit <br /> Groundwater Monitoring Plan G-2-3 Lewicki&Associates <br /> September 2022 <br />