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Doc Date:12/1 021/ 01 III IIIIII~IIIIII'll I 999 • SI~ 4.24 OPERATIONS IN ALLUVIAL VALLEY FLOORS 4.24.1 SCOPE This section establishes minimum environmental protection, performance, reclamation and design standards for surface coal mining operations on, or which affect alluvial valley floors in grid or semi-arid regions. It sets forth additional standards to preserve essential hydrologic functions, to protect existing or potential agricultural uses, and establishes monitoring requirements. Section 2.06.8, Surface Coal Mining and Reclamation Operations on Areas or Adjacent to Areas, Including Alluvial Valley Floors, discusses the field investigations and technical evaluations of all drainages within and adjacent to the Southfield permit area. These investigations were conducted by the previous operator, Dorchester, in conjunction with • preparation and submittal of the application for Mining and Reclamation Permit No. C-81-014. They were conducted in compliance with applicable provisions of Section 2.06.8 of the Colorado Regulations and OSM's 1980 Alluvial Valley floor Guidelines. Copies of all correspondence and reports relative to the alluvial valley floor investigations conducted at the site are provided in Exhibit 24, Alluvial Valley Floor Investigations. The conclusions reached in these investigations are that no areas within the Southfield mine area qualify as alluvial valley floors, while one (1) area at the Southfield coal loadout was determined to meet both the geomorphic and water availability criteria for designation as an alluvial valley floor. As a result of review of the data presented in the original Dorchester permit application, the CMLRD, in its permit findings document, made a determination of no significant impact for proposed loadout operations relative to the Oak Creek alluvial valley floor adjacent to the Southfield loadout area. The CMLRD determination of no significant impact is • included within this application on page 12 of Exhibit 14, Proposed Decision and Findings Compliance. 4.24-1