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PETERS ENGINEERING GROUP <br /> �) A CALIFORNIA CORPORATION <br /> 55 SHAW AVENUE, SUITE 220 PHONE (559) 299-1544 <br /> CLOVI5, CALIFORNIA 93612 FAX (559) 299-1722 <br /> r <br /> Technical Memorandum <br /> r _ <br /> To: Mr. John Forsythe From: David Peters, PE <br /> Environmental Science Associates Date: June 15, 2005 <br /> r <br /> Subject: RMC/ CEMEX Vernalis Mining Site—Third Haul Route <br /> This memorandum is intended to supplement a previous traffic impact study prepared by <br /> Peters Engineering Group dated March 5, 2004 entitled Traffic Impact Study-Proposed <br /> RMC Pacific Materials Inc. Mining Site Vernalis CA. <br /> r INTRODUCTION <br /> Peters Engineering Group previously prepared a comprehensive traffic impact study for a <br /> new new mining site within the area bound by State Route (SR) 580, SR 132, and Koster <br /> Road in Vernalis, California. Specifically, the site is located southeast of the intersection of <br /> Blewett and Koster Roads. Several other mining operations currently exist in the vicinity of <br /> the site. The proposed mining operation will produce aggregate products that will be shipped <br /> to Stockton, Modesto, Sacramento, and the Bay Area via 25-ton-capacity trucks. The project <br /> is expected to generate an annual average of 2.85 million tons of material, with a peak annual <br /> production of 4.0 million tons of material. Material will typically be hauled in 25-ton- <br /> capacity trucks that will arrive at the site empty and leave the site full of material. The trucks <br /> would return to the site empty via the same route after delivery of the material. Previously, <br /> r two proposed haul routes for the project were studied and are described below. <br /> Haul Route 1: All trucks entering and exiting the site use Blewett Road and Bird Road. Ten <br /> percent of trucks travel on.SR 132 west of Bird Road. Ninety percent of trucks access the SR <br /> 132/1-5 interchange. Seventy percent of trucks travel on I-5 north of SR 132. Five percent of <br /> trucks travel on I-5 south of SR 132. Fifteen percent of trucks travel on SR 132 east of I-5. <br /> Haul Route 2: Similar distribution to Haul Route 1, with the exception that trucks will have <br /> the option of using Koster Road for access to and from SR 132. In this case, it is anticipated <br /> that trucks leaving the site and traveling east on SR 132 will make right turns at Koster/SR <br /> 132. Trucks entering the site from the east may make left turns at Koster/SR 132. Trucks <br /> entering the site from I-5 north of SR 132 would likely travel east on SR 132 and tum right at <br /> r Koster. Due to difficulties in making left turns, it is anticipated that few trucks would leave <br /> the site traveling northbound on Koster and making a left turn to westbound SR 132. <br /> A third haul route has recently been identified as follows: <br /> Haul Route 3: This alternative involves trucks leaving the site and traveling north on Koster <br /> r Road to Blewett Road, east on Blewett Road to Welty Road, north on Welty Road to SR 33, <br /> r <br /> r <br />