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0 r Subpart P, and Title 8 CCR, 1541 will be followed. For trenches or excavations less than 4 feet in depth: Whenever possible, workers will not enter trenches or test pit excavations. When entry is required, standby personnel will be present to respond in the event of an emergency. • Stop logs or other barriers will be used to prevent vehicles from rolling into open trenches or excavation pits. • Sources of vibration and heavy objects or equipment will not be situated on the edge of a test pit unless steps are taken to ensure the stability of the trench wall. • Water will not be allowed to accumulate in trenches and excavations. • Excavated materials will be stored at least 2 feet from the edge of the trench or excavation. 3.1.3 Backhoe and Drilling Specific Hazards and Procedures Overhead Power Lines With drill rigs or any other equipment with a high boom, clearance from high voltage lines must be maintained in accordance to 8 CCR 2946 (Table 2). The minimum required clearance is as follows: Nominal Voltage Minimum Required (Phase to Phase) Clearance (feet) 600 to 50,000 10 over 50,000 to 75,000 11 over 75,000 to 125,000 13 over 125,000 to 175,000 15 over 175,000 to 250,000 17 over 250,000 to 370,000 21 over 370,000 to 550,000 27 over 550,000 to 1 ,000,000 42 The Site personnel shall be aware of increased electrical hazards during high humidity or rainy conditions. If the high voltage lines are not tagged, or if the voltage cannot be verified by an appropriate authority, then a minimum clearance of 42 feet shall be maintained. In the event the drill rig contacts an overhead power line: do not touch the rig or any person in contact with the current, keep others away, and call 911 and the local power company. No one should attempt a rescue unless he/she has proper qualifications. ENV~ 5 February 2005 A M E R 1 C A P1PG&E\PGE-05-01 Stockton MW26R Investigation\MW26 Work Plan\H&S\H&S Plan-2005.doc