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wasting events, produced thick deposits of alluvium and colluvium. The terms colluvium and <br />alluvium will be defined here as a reference for the reader as the terms are related and similar. <br />Both colluvium and alluvium describe loose, unconsolidated, heterogenous material. Both <br />alluvium and colluvium may include particle sizes from clay to boulder sizes. Colluvium <br />accumulates at the base of a slope due to the mass wasting. Mass wasting is the bulk movement <br />of materials of a variety of sizes, due to the effects of gravity. Mass wasting, and thus the <br />deposition of colluvium, is not dependent upon the presence or action of water. Alluvium <br />describes material that is deposited due to the action of water. For this reason, alluvium is often <br />more rounded than colluvium but not necessarily exclusively so. Often, alluvium and colluvium <br />are intermingled and hard to differentiate. For the purposes of this report, it is important to note <br />that both colluvium and alluvium are unconsolidated materials. In other words, they have not <br />undergone a process of cementation to turn them into lithified rock such as a sandstone or <br />conglomerate. As such, their stability is solely dependent upon their internal angle of friction or <br />any cohesion due to clay presence. It is these types of consolidated but unlithified alluvium and <br />colluvium deposits that will be mined by the Rincon Materials operation. <br />Rincon Materials - Geology (:rry Lcwicki and �ssckiatc. HI A.1 <br />February 2020 3 <br />