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Draft Supplemental Environmental Impact Report Page IV.B-37 Forward Inc. Landfill 2014 Expansion Project those of the previously proposed project evaluated in the 2013 EIR. The 2014 Expansion Project would not generate traffic in 2035;however, the impacts described above would be the worst- case effect in 2031 of the 2014 Expansion Project. Mitigation Measure B.6. (Revises 2013 EIR Mitigation Measure B.6). Measures to reduce the cumulative impact at Austin/Arch Roads are available,but these measures would not reduce the impact at this intersection to a less-than-significant level. No mitigation measures are available that would reduce the impacts at SR 99/Arch Road or SR 99/Mariposa Road SB Ramp to a less than significant level. In the worst case (as discussed above), the 2014 Expansion Project's contributions to cumulative impacts at these three intersections, as defined by County + policy, would be considerable, and would be a significant unavoidable impact. Impact B.7. Potential Impact to LOS at Austin/Mariposa and Austin/French Camp Under Cumulative Conditions. (Revises 2013 EIR Impact B.7) Because the 2014 Expansion Project would not generate traffic, or make a contribution to cumulative traffic, in the year 2035, there would be no effect on LOS at all study intersections in 2035. Therefore, the 2014 Expansion Project would have no impact on these intersections. The 2013 EIR found that that the previously proposed project would have a potentially significant impact on the intersections of Austin Road and Mariposa Road, and Austin Road and French Camp Road, in the Cumulative Year 2035. In its last year of operation, 2031, the effects of the 2014 Expansion Project would be similar to, or less than, the effects of the previously proposed project evaluated in the 2013 EIR. These impacts, discussed below would represent the worst-case effect of the 2014 Expansion Project in 2031. The 2013 EIR found that the intersection of Austin Road and Mariposa Road would operate at unacceptable LOS D during the AM peak hour under cumulative 2035 conditions (without the project). Addition of project traffic to cumulative 2035 conditions, and, in the worst case, in 2031, would increase the delay. With addition of a new southbound right turn lane, this intersection would operate at LOS D, with a (decreased) delay value of 34.2. The estimated cost of this improvement is$117,000 (based on 1,560 square feet of pavement at$50 per square foot plus 50 percent for design, administration,and inspection). Because there are no other pending projects to share the cost, the share attributable to the proposed project is 100 percent. The intersection of Austin Road and French Camp Road would operate at acceptable LOS C during the PM peak hour under cumulative 2035 conditions (without the project). Addition of project traffic to cumulative 2035 conditions, and, in the worst case,in 2031, would degrade operations from LOS C to LOS D. With widening of the westbound approach to two lanes (a shared through-right lane and shared through-left lane), the resultant LOS would be C with a delay value of 18.9. The estimated cost of the improvement is$540,000 (7,200 square feet of -- pavement at$50 per square foot plus 50 percent for design, administration, and inspection). Because there are no other pending projects to share the cost, the share attributable to the proposed project is 100 percent. Mitigation Measure B.7. (Revises 2013 EIR Mitigation Measure B.7). The applicant shall commence traffic monitoring of the Austin/Mariposa and Austin/French Camp intersections on five-year intervals until such time as the first phase of development in the Mariposa Lakes development is constructed and occupied. After such time monitoring shall occur on an annual basis. Monitoring reports shall be prepared by a Professional Engineer as described in the County traffic impact guidelines.Monitoring shall include manual peak period turning -- movement counts with a summary report showing intersection LOS results. Design of the