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1 .0 INTRODUCTION <br /> This Annual Hydrology Report presents the hydrologic monitoring data <br /> collected during the 2020 water year (October 2019 - September 2020) at <br /> the Seneca Coal Company's (SCC) Seneca II-W Mine (SIIW). The AHR fulfills <br /> the reporting requirements under the Colorado Division of Reclamation, <br /> Mining, and Safety (CDRMS) Permit No. C-82-057. <br /> 1.1 BACKGROUND <br /> SIN is a surface coal mine located in Routt County, approximately 9 miles south of <br /> Hayden, Colorado (Figure 1). Mining began at SIN in August 1990. Production ceased <br /> in 2005 and the last of the coal at SIN was removed in January 2006. The mine has <br /> been reclaimed and vegetated for many years and SCC is actively pursuing bond <br /> release. <br /> Page 4 of 17 <br />