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ERO Project #24-180 1 <br />ERO Resources Corporation <br /> <br /> <br />Consultants in Natural Resources and the Environment <br /> <br /> <br />Technical Memorandum <br />File and Literature Review <br />P125 Gravel Mine Project <br />Weld County, Colorado <br /> <br />Prepared for— <br />Raptor Materials <br />8120 Gage Street <br />Erie, Colorado 80516 <br /> <br />September 13, 2024 <br /> <br />Raptor Materials (Client) retained ERO Resources Corporation (ERO) to perform a cultural resource file <br />and literature review for a proposed gravel mine (project) located south of State Highway 66 and west <br />of Weld County Road 17 in Weld County, Colorado (project area; Figure 1, attached). The project <br />proposes to construct a commercial gravel mine on former agricultural land. The proposed project may <br />require a U.S. Army Corps of Engineers (Corps) Clean Water Act Section 404 Permit for proposed <br />modifications to wetlands; therefore, compliance with Section 106 of the National Historic Preservation <br />Act (NHPA) may be required. The results of the file and literature review will provide the Client’s <br />planners with information regarding known and potential cultural resources as well as a summary of <br />potential regulatory requirements that could stipulate for additional cultural resource identification and <br />documentation. This technical memorandum can also be used by the Corps to determine if any <br />additional efforts are necessary to comply with the NHPA. <br />Project Area <br />The project area includes four discontinuous but adjacent areas of potential ground disturbance <br />including the limits of disturbance to construct a gravel mine complex (125.83 acres). The project area is <br />south of State Highway 66 and west of Weld County Road 17. An unnamed dirt road extending from <br />Weld County Road 26 ¾ trends northeast-southwest and bisects the project area. The St. Vrain River <br />flows north to south and is located to the west. Agricultural land surrounds most of the project area <br />with modern residential developments located to the south and west. The project area is in Section 29, <br />Township 3 North, Range 67 West of the 6th Principal Meridian in Weld County, Colorado (Figure 2).