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2025-03-14_PERMIT FILE - M2025016 (37)
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2025-03-14_PERMIT FILE - M2025016 (37)
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Last modified
3/17/2025 12:02:43 PM
Creation date
3/17/2025 9:53:14 AM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
M2025016
IBM Index Class Name
Permit File
Doc Date
3/14/2025
Doc Name Note
Exhibit H Cultural Resources
Doc Name
Application
From
Raptor Materials LLC
To
DRMS
Email Name
JR2
AME
EL1
Media Type
D
Archive
No
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Technical Memorandum File and Literature Review <br />P125 Gravel Mine Project, Weld County, Colorado <br /> <br /> <br />ERO Project #24-180 3 <br />ERO Resources Corporation <br />General’s Office 1949) and aerial images from 1948 to 2023 (Google, Inc. 2024; Nationwide <br />Environmental Title Research 2024). <br />A portion of an unnamed ditch and a trail are mapped on the original 1863 GLO survey plat in the <br />general project location (General Land Office 1863). By 1902, at least one building is mapped near the <br />northeastern section of the project area; later maps and aerial imagery indicate that this structure was <br />removed by 2019 (Nationwide Environmental Title Research 2024; U. S. Surveyor General’s Office 1902; <br />U.S. Surveyor General’s Office 1949). The building location is close enough to the project area that <br />historical materials could exist in the project area (Google, Inc. 2024). Topographic maps dating between <br />1949 and 1950 depict a segment of the Union Pacific Railroad that directly intersects the project area <br />diagonally from the southwest to the northeast. This segment was decommissioned by the 2010s. A <br />two-track road is near the railroad. According to the Client’s plans, the abandoned grade is situated to <br />the west of the extant road. Per recent guidance from the OAHP, unnamed, unimproved roads typically <br />do not require documentation as cultural resources (Horn and Norton 2021). <br />ERO evaluates the potential for buried cultural resources through surface geology and topographic <br />maps. Sediments are consistent throughout the project area and are mapped as Holocene in age (Tweto <br />1979). Light disturbances to the project area began, approximately, in the late 1800s in association with <br />agricultural activity (Google, Inc. 2024). The railroad has disturbed a small linear segment in the project <br />area, while other sections, specifically near the St. Vrain River, appear to be undisturbed. Because of the <br />presence of Holocene-aged deposits and the overall light disturbance, undocumented buried Native <br />American resources are potentially present in the project area, especially in the western section of the <br />project area along the St. Vrain River. This area has a higher chance of containing Native American <br />resources because it is near a prominent water source, appears undisturbed, and has an increased <br />chance for deep soil deposits. <br />Summary <br />Although no previously documented cultural resources are in the project area, the file search and <br />literature review indicates that an abandoned segment of the Union Pacific Railroad exists in the project <br />area. Additionally, historical remains could be present in the northeastern section of the project area <br />near where a historic agricultural complex was removed in 2019. Due to the lack of previous surveys in <br />the project area and the presence of permanent water sources, undocumented Native American sites <br />are potentially present in the project area. Furthermore, the presence of Holocene-aged sediments also <br />indicate a potential for subsurface cultural deposits. <br />If a permit is required by the Corps, additional work may be necessary to satisfy Section 106 of the <br />NHPA. ERO can assist in any survey, documentation, or reporting required. Please feel free to contact <br />ERO by email at mdinkel@eroresources.com or by phone at (303) 830-1188 with any questions you may <br />have in reference to the file and literature review results and additional work potentially needed for <br />NHPA or State Register Act compliance.
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