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• <br /> „ <br /> Factor Key: <br /> A pipeline segment may be placed into planning for further study and long -range planning based upon its risk for one of five factors: <br /> • <br /> • Potential for Third -Party Damage: Third -party damage is the number one rislc to PG &E's pipeline system. Indications that <br /> a pipe may be at risk for third -party damage include whether or not the line segment has a history of third party damage, the {I <br /> depth at which the pipe is buried, the pipe's diameter, the degree of marlcing available for the pipe's location, and local <br /> awareness in the immediate area of the pipeline's location. Some of the actions PG &E would take to reduce this risk factor <br /> would include additional marking of the pipeline location (when possible), additional education in the immediate area for the fi <br /> 811 system to call before digging, and monitoring of construction activity and/or permits in the area around the pipeline. 1 <br /> • Potential for Corrosion: Factors include items such as: the coating design, the resistivity of the soil, and other ground -based <br /> factors which could reduce the thickness of the pipe wall. Some of the actions PG &E would take to reduce this rislc include <br /> regular and ongoing monitoring (PG &E monitors both electronically and physically, physically checicing every 2 months at <br /> over 6,000 locations in its natural gas transmission system), increasing or replacing the pipe's external protective coating, or <br /> replacement of the pipe itself. 1 <br /> • Potential for Ground Movement: Factors include the proximity to seismically active areas, and the potential for soil erosion <br /> around the pipeline. Some of the actions PG &E would take to reduce this risk include enhancing the strength of the pipe, <br /> increased monitoring, or burying the pipe a greater depth beneath the ground level (for erosion prevention). <br /> • Physical Design and Characteristics: Factors include items such as: the age of pipe, the type of welding performed on the ; <br /> pipe, the fittings used in the pipeline, and the materials used to manufacture the pipe. Some of the actions PG &E would take to <br /> reduce this rislc factor include replacement of the pipe or fittings in order to upgrade or improve the design or characteristics of <br /> the line segment. • <br /> •• Overall: Did not score high in any one factor of the above factors, but scored moderately high in more than one factor. <br /> i <br /> • <br /> • <br /> • <br /> 2 • <br /> • 9/20/2010 I . <br /> • <br /> I <br /> 1 i I <br />