2018-11-21_REVISION - M2004044 (26)

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2017 Wetland Delineation Report Tucson South Sand and Gravel Mine—Brighton,Colorado Table 5: Ponds Observed Within the Project Boundary Pond Approximate Number Acreage Latitude Longitude Likely Jurisdictional Status' A15 0.61 39.99038 -104.84156 Likely Non-Jurisdictional Note that only the USACE can render an approved Jurisdictional Determination(JD).The likely jurisdictional status listed in Table 3 only reflect Tetra Tech's understanding of Jurisdictional Waters of the United States.Without a USACE rendered jurisdictional determination,impacts should be avoided to these wetlands. 5. Conclusions and Recommendations The wetland and other WOTUS delineation report presents the results of a desktop analysis and field delineation in accordance with methods outlined in the USACE Wetland Delineation Manual (USACE 1987) and the Regional Supplement to the USACE Wetland Delineation Manual. Great Plains Region (Version 2.0) (USACE 2010). Fourteen features were delineated in the Project area (Figure 2) including eight wetlands (Table 3), six streams (Table 4), and one pond (Table 5). Tetra Tech identified eleven of these features as not likely jurisdictional and therefore not likely subject to Section 404 permitting. Three features, Wetlands A4 and A6 and Stream Al (South Platte River) were determined to be likely jurisdictional and subject to Section 404 permitting. Because only the USACE can determine the jurisdictional status of a wetland or other WOTUS, Tetra Tech recommends consultation with the Denver Regulatory Office of USACE prior to construction to confirm our determinations and to identify the permitting requirements, if any, for the development of the project. The USACE typically issues Nationwide permits (NWPs) from the USACE allow for minor impacts in streams, wetlands, and other WOTUS that are jurisdictional under Section 404 of the CWA.A minor impact is generally less than 0.5 acre. When impacts to jurisdictional wetlands or other WOTUS exceed minor impacts, the USACE will generally require an Individual Permit. Should the project construction design include impacts greater than 0.5 acres, the project would likely be subject to an Individual Permit. The Project area intersects a FEMA mapped floodplain associated with the South Platte River. Tetra Tech recommends consultation with Adams County to determine permitting requirements for construction within the FEMA mapped floodplain. 6. References Ackerfield, Jennifer. 2015. Flora of Colorado. Botanical Research Institute of Texas Press. Fort Worth, Texas. 11