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6 covered the entire mine permit boundary and additional property under Southdown's ownership, with the cultural resource Study Area encompassing more than 2,200 acres (Section 3.0). Eliaibil;ty Evaluations All cultural resources sites have been inventoried and documents with the appropriate forms and submitted to the Colorado Historical Society, Office of Archaeology and Historic Preservation (SHPO) for determinations of eligibility for inclusion on the National and State Register of Historic Places. Twenty-two prehistoric sites have been identified in the Study Area; 8 are recommended as eligible for the NRHP. Eight historic sites have been identified in the Study Area; seven are recommended as eligible for the NRHP. Determination of Project rmpacts Based upon evaluations by SHPO and Boulder County on the significance of cultural resources in the Study Area, further analysis was completed by Southdown, the State of Colorado, and Boulder County to determine if the Project has an effect or specific impact upon these significant cultural resources. No known NRHP eligible resources are located within the mine and reclamation impact zone. Four NRHP eligible irrigation ditches must be crossed by the quarry haul road (Section 3.0). Effects may be adverse in the case of actions that severely alter or necessitate removal of a cultural resource. An adverse effect may not directly impact a resource, but significantly alter the context or setting of that resource. To assist in a determination of adverse effects, this CRMP presents a detailed set of geologic, prehistoric, and historic contexts for the Study Area (Section 2.0). Effects may be beneficial in the case where a cultural resource is not altered and received documentation, proactive management, and protection. In the instance when a clear determination of