2023-07-19_REVISION - M2021052 (14)

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RECEIVED 'JUL 19 2023 Ritie Gravel Pit#1 Colorado Division of Reclamation,JLily 2023 10.0 Exhibit I - Soils Information 10.1 Topsoil Present in Affected Lands (Mining Operations) SGM reviewed the Soil Survey Geographic Database (SSURGO) which indicated the presence of four soil types within the Affected Lands. The mapped soil unit boundaries were found to be roughly accurate, although soil texture did vary widely, likely because of the combination of past agricultural treatments and historic flood deposition/scouring events. • 27—Halaquepts, nearly level Typical profile: H1 —0 to 8 inches: clay loam H2 —8 to 24 inches: loam H3—24 to 60 inches: stratified very gravelly cobbly sand • 40—Kim loam, 3 to 6% slopes Typical profile: H1 —0 to 17 inches: loam H2 — 17 to 60 inches: loam • 49—Olney loam, 1 to 3% slopes Typical profile: H1 —0 to 12 inches: loam H2— 12 to 33 inches: sandy clay loam H3—33 to 43 inches: gravelly sandy clay loam H4—43 to 60 inches: very gravelly sandy loam • 72 —Wann sandy loam, 1 to 3% slopes Typical profile: H1 —0 to 8 inches: sandy loam H2 —8 to 60 inches: fine sandy loam, sandy loam, coarse sandy loam Figure 23, Exhibit I depicts the soil information. According to the USDA NRCS Web Soil Survey, most of the soil map units in the permit area are ranked as fair gravel sources and one soil unit (Olney loam) is ranged a poor. All the soils except the Kim loam is rated as fair condition for sand sources. Approximately 50% of the permit area has soil units that are rated as fair to good for reclamation material. Where/when applicable, the top 6 inches of topsoil will be salvaged and stored for later reclamation uses (-533 CY). The soil review indicated that the project site is dominated by loam deposits overlying the alluvial gravels. The side cast gravels from the ditch excavation have been incorporated into surface soils in the area immediately adjacent to the ditch. 66