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CHAPTER 4 ENVIRONMENTAL ANALYSIS 4.1.1 INTRODUCTION TO THE ANALYSIS The following sections (4.2 through 4.12)of this Draft EIR provide a discussion of the existing _ setting,potential environmental impacts, and proposed mitigation measures. The potential effects of implementing the Proposed Project are identified, along with mitigation measures recommended to lessen or reduce identified impacts.In cases where no mitigation is feasible,this fact is noted. 4.1.2 SIGNIFICANCE OF ENVIRONMENTAL IMPACTS Whenever possible and reasonable, significance criteria are established which serve as the bench mark for determining impacts. Significance criteria are identified for each environmental category to determine if the.project will result in a significant environmental impact when evaluated against the environmental setting(baseline conditions). The significance criteria vary depending on the environmental category. In general,effects can be either significant(above threshold), or less-than-significant(below threshold). 4.13 SETTING, IMPACTS, AND MITIGATION MEASURES Pursuant to CEQA Guidelines Section 15125, an EIR must include a description of the physical ` environmental conditions in the vicinity of the project,as they exist at the time the NOP is published. The environmental setting will normally constitute the baseline physical conditions by which a lead agency determines whether an impact is significant. The setting is presented from site,local,and/or regional perspectives, as appropriate to each environmental topic. According to the CEQA Guidelines,the effects of the project are defined as changes to the environmental setting that are attributable to the project. In describing the relative significance of project impacts,each impact is identified to he potentially significant,significant,cumulatively significant,significant unavoidable,less-than- significant, or beneficial. The cumulative impact analysis in this EIR is based on the implementation of the proposed project as well as approved and anticipated development in the region. A summary of cumulative impacts is provided in Chapter 6.0. According to the CEQA Guidelines Section 15382, a significant effect on the environment means `...a substantial,or potentially substantial, adverse change in any of the physical conditions V RMC Pacific vemalis Quavy Mining end Eeclamaum Project 4.1-1 BSA/209015- AdminisVa&e Draft E02 Match 2004