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TECHNICAL MEMORANDUM CH2MHILL Transportation of Ammonia Risk Analysis PREPARED FOR: Sarah Madams/CH2M HILL PREPARED BY: Jerry Salamy/CH2M HILL, DATE: August 29,2008 Anhydrous ammonia will be transported to the project site using U.S. Department of Transportation (DOT) approved tanker trucks. However,the transportation of ammonia, and any other hazardous material,poses a risk of exposure to the surrounding population due to an accidental release caused by a traffic accident involving the delivery vehicle. An ammonia leak occurring during delivery of the material to the LEC storage tank could result in hazardous ambient concentrations in the immediate vicinity of the release. The impact of this accidental release would depend upon the location of the release relative to the public. The possibility of accidental release during delivery depends upon the following factors which are reflected in the accident statistics: • Skill of the drivers • Type of vehicle used for transport • Traffic conditions or road type Because of the potential impact on the public,there are extensive regulatory programs in place in the United States and California to ensure safety during the transportation of hazardous materials, see the Federal Hazardous Materials Transportation Law (49 U.S.C. § 5101 et seq.),the US Department of Transportation Regulations (49 C.F.R. Subpart H, §172- 700), and California DMV Regulations on Hazardous Cargo (CCR,Vehicle Code, §34000). These regulations also address the driver's abilities and experience. Because of these regulations,the CEC staff only focuses on the potential for an incidence after the delivery vehicle has left the main highway.1 Therefore,the following analysis focuses on the non- highway delivery routes due to the greater potential for accidents to occur on non-highway roads. Transportation Probability Analysis Technical and scientific literature on hazardous materials transportation was reviewed for accident rates in the United States and California in performing this transportation probability analysis for the delivery of ammonia to LEC. The following references were used to prepare this hazardous materials transportation probability analysis: Davies,P.A. and Lees,F.P. 1992. "The Assessment of Major Hazards: The Road Transport Environment for Conveyance of Hazardous Materials in Great Britain." Journal of Hazardous Materials,32:41-79. 1 See Hazardous Materials Management section of the Final Staff Assessment for the Contra Costa Power Plant Unit 8(00- AFC-1),March 2,2001. 1