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Historic Properties Treatment Plan, Collorn Mine, Colorado 31 <br />5.2 PHASE II DATA RECOVERY FIELD METHODS <br />Standard archaeological field procedures will be followed throughout the project. The <br />horizontal grid for the block will be oriented north /south; however, if for some reason the grid <br />is not oriented to true north, the appropriate grid directions (grid north, grid south, grid west, <br />grid east) will be used in lieu of compass directions in all descriptions and designations. The <br />basic unit of excavation and documentation will be a 1 x 1 -m excavation unit. Each 1 x 1 -m <br />excavation unit within the excavation block will be labeled using both the coordinates of its <br />southwest corner and a unique letter- number designation. All measurements for the <br />proveniencing of artifacts will be taken from the southwestern corner of the unit. <br />The vertical grid system for the excavation block will be established relative to a vertical datum <br />arbitrarily denoted as 100 -m elevation. The vertical grid will be structured in 10 -cm increments <br />relative to the vertical datum (e.g., 99.20 -99.10 m). The first level excavated in a given l x 1 -m <br />unit will be designated Level 1, the second level designated as Level 2, etc. All excavation <br />forms, record forms, artifacts bags, and sample bags will be labeled with both the level elevation <br />and the level number. Elevation subdatums will be set using a transit and checked regularly <br />with a transit. Line levels and /or transit will be used for taking elevations. <br />Excavations will proceed in 10 -cm levels. Exceptions may be where select units are excavated <br />stratigraphically to fine -tune the stratigraphic relationships between individual cultural layers, <br />if encountered. Each level of each 1 x 1 -m unit will be excavated separately. Shovels and <br />trowels will be used for all excavations, except for the extraction of features for which trowels, <br />brushes, and whisk brooms will be used. All excavated deposits will be screened through <br />1/8 -inch hardware cloth. An Excavation Level Form will be completed for each level. The <br />Excavation Level Form contains spaces for recording specific types of data for each 1 x 1 -m <br />excavation unit. The entire area of the excavation block will be excavated simultaneously to <br />facilitate the exposure of entire occupation surfaces. <br />47599 TRC Mariah Associates Inc. <br />