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DocuSign Envelope ID: EBE28081 -B782-4B42-BADB-D8C93B687B1 B <br />December 22, 2020 <br />Angela Aalbers <br />Page 8 of 12 <br />Reference: East Taylor Seep Investigation <br />Figure 5 East Taylor Seep Average Daily Flow Rate (measured at East Taylor Seep weir) <br />East Taylor Seep Flow Rate (Daily Average) <br />180 <br />160 <br />140 <br />120 <br />E <br />a <br />100 <br />v <br />3 <br />80 <br />0 <br />LL <br />60 <br />40 <br />20 <br />0 <br />10/16/20 10/26/20 11/05/20 11/15/20 11/25/20 12/05/20 12/15/20 <br />The seep flow data also recorded an immediate response to rain and snow on November 8, 2020 and <br />November 23, 2020. In each case, the seep flow rate changed by approximately 30 gpm, based on the 15- <br />minute data. The elevated flows lasted for a limited period of time (up to 6 hours) before returning to the <br />previous flow rates. Infiltration is a partial source for the seepage based on the water balance; however, the <br />rapid response is not likely caused by the infiltration. The infiltration flow route would be much slower and <br />would not respond as quickly as the data shows. Thus, there must be a secondary source with a more direct <br />connection to the seep, and the immediate response suggests there is a direct connection to surface water. <br />The seep flow showing the 15-minute data are presented in Figure 6, below. <br />The elevated flows are not likely to be from flow through surficial material, since the reclaimed slope consists <br />of overburden material covered with topsoil. Neither the overburden material nor the topsoil would confine <br />infiltrated water and divert it downslope towards the seep; infiltrated water would migrate downward to the <br />base of the reclaimed overburden where bedrock provides a confining layer. <br />Design with community in mind <br />pk c:\users\pkos\documents\_projects\colowyo\easttaylorseepwaterbalance_22dec2020_final.docx <br />