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•- Revised Traffic Impact Study March 27,2008 Proposed CEMEX Mining Site Page 14 Table 8 Traffic Index Summary Existing Traffic Index With Project �r Road Segment Traffic Index Haul Route 1 Haul Route 3 Blewett Road Bird Road to I-5 12.5 13.0 12.5 Blewett Road I-5 to Koster Road 8.5 11.5 8.5 ►� Blewett Road East of Koster Road 8.5 8.5 11.5 Bird Road Blewett Road to SR 132 14.0 14.0 14.0 SR 132 Chrisman Road to Bird Road 13.0 13.0 13.0 ` SR 132 Bird Road to I-5 13.0 13.5 13.0 §R132 I-5 to Koster Road 12.5 12.5 12.5 Si 132 Koster Road to McCracken Rd 12.5 13.0 13.0 L, The TI analyses suggest that the Project and Haul Route 1 will create potential pavement impacts on Blewett Road between I-5 and Koster Road. The analyses also suggest that the Project and Haul Route 3 will create potential pavement impacts on Blewett Road between Koster Road and Welty I6, Road. However, it is noted that the TI analyses are based on a 20-year pavement design life. Therefore, if Haul Route 3 is considered only as a short-term option then a significant impact would not be identified. V' It is also noted that a pavement impact may not be identified if the TI used in design of the existing roadways is already capable of supporting the Project traffic volumes. ` Considering that this traffic impact study is not a design-level document, it is not recommended that the TI values presented herein be used for design purposes. The existing TI values presented herein are based on traffic volumes counted during periods of greater-than-average aggregate activity and ` are therefore likely greater than the actual TI averaged over an entire year. More extensive traffic counts would be required for design. If road design is required as a mitigation for this Project or as a part of any other project, it is recommended that a design TI be determined as a part of the road ` design project or as otherwise specified by the County. 7.0 —FAIR-SHARE PERCENTAGE Many governing agencies require that a calculation of fair-share percentage (also referred to as pro rata or equitable share responsibility) be included in the traffic impact study report where future improvements are required, whether or not the improvements are the result of the specific project t. studied. The fair-share percentage provides a measure of a project's share of the anticipated future improvements to the transportation network. The following equation is used by Caltrans to determine the fair-share percentage: P=� Ta—Te 6. P= The equitable share of the Project's traffic impact; T =The Project trips generated during the peak hour of the adjacent State Highway facility; LTB = The forecasted (2025 cumulative with Project) traffic volume on the impacted State highway facility; TE=The existing traffic on the State Highway facility plus approved projects traffic (near term). To mitigate the Project's share of the cost of construction of planned or required improvements, the fair share calculations presented in Tables 9 and 10 are required for Haul Routes 1 and 3, L L