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Cemex Vernalis Quarry Mining and Reclamation Pmject 4.4.3 Impacts and Mitigation Measures Significance Criteria According to CEQA Guidelines,a project would normally have a significant effect on the environment if it would "cause an increase in traffic which is substantial in relation to the existing traffic load and capacity of the street system." For the purpose of this EIR, reference is made to _ the San Joaquin County Guidelines for the Preparation of Traffic Impact Studies,which states that"all County roadways shall operate at LOS C or better and intersections shall operate at an overall LOS D or better on minor arterials and roadways of higher classification; and LOS C on all other roads. All freeways and state highways shall operate at LOS D." In addition,for the purpose of this EIR,the project would be considered to cause a significant — impact if project-generated traffic would cause an increase in traffic safety hazards on area roadways,or deterioration of the physical condition of area roadways and bridges. A small impact can be considered significant. The threshold for roadway structural sections is usually an increase in the Traffic Index of between greater than 0.5 and 1.0. Intersection Analyses The following scenarios were analyzed for weekday AM peak hour conditions in this analysis, which typically occurs between 7:00 and 9:00 AM. • Existing Conditions 0 Existkt With Seasonal Adjustments • Cumulative Without Pfeje,.«Near-Term Without Proiect(Existing Conditions plus Approved Projects) • Cumulative With Pr Near-Term With Project-Haul Route Option 1 _ • Cumulative With o. :o t Near-Term With Project-Haul Route Option 2 3 c..« re Conditions Without Projeet(Year 2025) Cumulative Year 2025 Conditions Without Proiect • Futufe Conditions With Project Cumulative Year 2025 Conditions With Project- Haul Route Option I . Future Cond-ifien,,exr:a, Projeet Cumulative Year 2025 Conditions With Project- Haul Route Option-2-3 — The PM peak hour,which typically occurs between 4:00 and 6:00 PM,was not analyzed because the project-generated traffic is expected to decrease significantly between approximately 3:00 and — 4:00 PM,and as described above, 24-hour machine counts conducted for this EIR indicate that truck traffic originating from the existing mining sites in the project area is negligible during the PM peak hour of the adjacent roads relative to the AM peak-hour volumes. Generally-accepted traffic engineering principles and methods were employed to estimate the amount of traffic expected to be generated by the project and to analyze the traffic conditions expected to exist in the future. Cemex Vernals Quarry Mining and Reclamation Project 4-26 ESA 1203615 Final Environmenbl Impact Report June 2008