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MEMORANDUM L TO: MR. BRIAN GRATTIDGE/ESA FROM: DAVID PETERS,PE,TE �. SUBJECT: CEMEX VERNALIS MINING SITE DATE: 5/28/2008 INTRODUCTION L This memorandum investigates the operating characteristics of the Welty / State Route 33 intersection in Vernalis, California as shown in Figure 1. The intersection is part of a ` proposed aggregate truck hauling route associated with a new proposed mining site in the area. The study focused on the following: t ;' • Turning radius and off-tracking — This analysis determines whether or not a truck can make turns at the intersection without wheel tracking off of the pavement and assumes an inbound and outbound truck is making the turns concurrently. Both a two-trailer haul truck and an asphalt tanker truck tum radius were used in this evaluation. L • Evaluation of Railroad Track Queuing — This analysis focused on the potential of trucks queuing away from the intersection and onto the adjacent railroad tracks. L • Sight Distance—Potential sight distance constraints were evaluated in this analysis. L • Acceleration / Deceleration Needs — This study identifies the potential needs for L acceleration or deceleration lanes for trucks making movements at the study _ intersection. L ANALYSIS LTurning Radius / QJLTrwking The study intersection was evaluated using the computer program AutoTum 6 and aerial L photos available from GoogleEarth. Additionally, a field visit was made on May 21, 2008 to verify existing conditions at the site. Both double trailer aggregate trucks and tanker trucks were evaluated. The tanker truck was simulated most closely by use of the STAA-STD truck L turning template. The estimated wheel tracking patterns for both trucks turning right onto southbound Welty and northbound trucks turning left onto State Route 33 are shown in Figure 2. The tanker truck template governed the analysis because the intermediate hinge Lpoint of the double aggregate trailers allows for tighter turning movements. The analysis L L