2021-02-05_PERMIT FILE - M2020041

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ERC Peak Ranch Resource Aquatic Resource Delineation Report EXECUTIVE SUMMARY This report summarizes the delineation of aquatic resources completed by Ecological Resource Consultants, Inc. (ERC) for the Peak Ranch Resource Site (survey area). ERC conducted a formal routine onsite delineation of aquatic resources within the 78-acre survey area located on Highway 9 approximately 11.5 miles north of the Town of Silverthorne, Summit County, Colorado on August 28-29, 2018. In total, approximately 7.89 acres of Aquatic Resources were identified within the survey area including approximately 1,675 linear feet of stream channel comprising the main channel of the Blue River.Aquatic resources are identified as Aquatic Resources A,BR(Blue River),and ID(Irrigation Ditch).Aquatic Resource A comprises approximately 6.68 acres of PEM wetland habitat existing as a wet meadow situated within the northeast portion of the survey area.Aquatic Resource BR comprises approximately 1,675 linear feet or 1.01 acres of the main channel of the Blue River and a narrow (5-10-foot wide) palustrine shrub-scrub (PSS) riparian fringe extending landward from the ordinary high-water mark (OHWM) of the Blue River. Aquatic Resource ID comprises approximately 641 linear feet or 0.2 acres of man-made irrigation ditch located in the northwest portion of the survey area. In November 2020, following the 2018 delineation by ERC, the Municipality of Breckenridge upgraded a drainage ditch under Nationwide Permit 3 — Maintenance. The ditch, which is maintained by the Municipality of Breckenridge under a decreed water right, was present prior to the 2018 delineation, however was in disrepair and non-functional. This upgraded ditch is likely now to collect hydrology and may alter the wetland characteristics described in this report. All areas that have been investigated in the field are mapped on the Aquatic Resource Delineation Map (Appendix A).