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San Joaquin County Community Other CEQA Considerations Development Department — the related projects,and contain a reasonable analysis of cumulative impacts and mitigation measures(State CEQA Guidelines Section 15130[b]). Approach to Cumulative Impact Analysis This cumulative impact analysis is based on a list of closely related past,existing, and reasonably foreseeable future projects that could contribute to significant impacts. The analysis is largely based on information provided by the County — regarding other projects for which applications have been filed,or which have recently been approved but not yet constructed. Because of the long lifespan of the Project(up to 40 years)and the inability to predict conditions 40 years in the — future with any reasonable certainty,the cumulative analysis was based largely on conditions forecasted up to 2027, the year for which the traffic study future conditions was prepared(Omni Means 2005). The traffic study assumed an average 2027 mine production rate of 800,000 tons per year and a peak adjustment factor of 1.4(40%increase)to reflect the one or more peak production months that occurs on a yearly basis. Past, Existing, and Proposed Projects _ The project area is in an unincorporated portion of the County;however, the region of influence examined in the analysis of cumulative impacts varies _ depending on the specific resource or topic. For example, cumulative noise impacts may be associated only with projects that are geographically close,and may affect only a small area close to the noise-generating source. In contrast, cumulative air quality impacts are determined on a regional basis. The existing _ and proposed projects listed below have been included in this analysis because they either are close to the project area or could affect regional resources. This information was assembled by County staff and represents the most up-to-date — information available as of the circulation date of this document. Mining Projects Below is a list of mining projects that are currently in operation or that are — anticipated to be in operation in the vicinity of the project area. ■ Teichert Aggregates' Vernalis quarry(County quarry permit#QX-91-5), — located on the north and south sides of Blewett Road between Bird Road and the California Aqueduct,and on the southeast comer of Blewett Road and I-5. ■ DSS' Trains quarry (County quarry permit#QX-96-1), located on the west side of Koster Road,0.5 mile south of Blewett Road. ■ Granite Construction's Vernalis quarry (County quarry permit#QX-94-1), located on the east side of Bird Road between I-580 and I-5. DeSilva Gates Quarry Project Draft Environmental Impact Report 5-2 AS 05105.x5