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DocuSign Envelope ID: EBE28081 -B782-4B42-BADB-D8C93B687B1 B <br />December 22, 2020 <br />Angela Aalbers <br />Page 9 of 12 <br />Reference: East Taylor Seep Investigation <br />Figure 6 East Taylor Seep 15-Minute Flow Rate (response to precipitation) <br />East Taylor Seep Flow Rate (15-min Interval) <br />170 <br />160 <br />150 <br />140 <br />E <br />a <br />°0 13C <br />v <br />120 <br />0 <br />LL <br />110 <br />01919 <br />0I0 <br />80 <br />11/22/2020 11/23/2020 <br />Taylor Creek Flow Monitoring <br />11/24/2020 <br />Colowyo staff measured stream flows in Taylor Creek on September 10, 2020 in locations above, adjacent to, <br />and below the highwall miner hole locations to determine if there were flow losses in this area. The stream <br />measurement locations are shown as TC-01, TC-02, and TC-03 on Figure 2. TC-01 was located upstream <br />from the highwall miner holes, TC-02 was located between the highwall miner hole sets, and TC-03 was <br />location downstream from the highwall miner holes. The measured flows are listed in Table 2. The flow <br />decreased by 32 gpm from upstream to downstream, and this is a significant loss of flow considering the flow <br />at TC-01 was only 37.2 gpm. This suggests a change in the stream substrate that is removing water from the <br />stream. These types of stream losses can be attributed to faulting, changes in geology, diversions, or <br />pumping, but none of these are known to be present in this location. Therefore, the residual effects of the <br />highwall miner holes are the most likely cause of the decreased stream flows. The stream monitoring <br />occurred as a single event under low flow conditions, and it is unknown how the stream flows would decrease <br />during higher flow conditions. <br />Design with community in mind <br />pk c:\users\pkos\documents\_projects\colowyo\easttaylorseepwaterbalance_22dec2020_final.docx <br />