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Levine-Fricke-Recon Section: 5 - ' Date Initiated:September 23, 1996 Revision No.: 1 Date Revised:August 21, 1998 ' Page 13 of 34 near heavy equipment. If loud noise is present or normal conversation becomes ' difficult, hearing protection in the form of ear plugs, or equivalent, will be required. 5.2.4 Electric Shock All electrical equipment to be used during field activities will be suitably grounded and insulated. Ground fault circuit interrupters will be utilized with all heavy electrical ' equipment to reduce the potential for electrical shock. ' 5.2.5 Excavations Trenching for the installation of remedial systems may occur during the course of the ' project. The trenching activities for the installation of conveyance piping are expected to be to a depth no greater than 3 feet below ground surface. If more extensive excavation activities are necessary, the following requirements will be observed. ' Workers shall not enter excavations or trenches greater than 4 feet in depth without first obtaining a permit for confined space entry from the Director of Health and ' Safety. The walls and spaces of all excavations more than 4 feet deep that will be entered by personnel shall be guarded by shoring, sloping, or benching. Air monitoring will be performed in excavations greater than 4 feet in depth into which a person will descend. Air monitoring will include the use of an LEL/02 meter and photoionization detector/flame ionization detector (PID/FID), as appropriate. Side slopes shall not be steeper than 1:1 without a written report from a qualified civil or geotechnical engineer. All excavations shall be in accordance with the Cal/OSHA Excavation Safety Standard, 8 CCR 1541. The SSO shall inspect excavations daily. If there is evidence that a cave-in or slide is possible, all work shall cease until the necessary safeguards have been taken. Excavated material shall be placed far enough from the edge of the excavation (a ' minimum of 2 feet) so that it does not fall back into the opening. At the end of each day's activities, all open excavations will be clearly marked and secured to prevent nearby workers or unauthorized personnel from entering them. ' 5.2.6 Underground and Overhead Utilities ' The location of all underground pipes, electrical conductors, fuel lines, and water and sewer lines must be determined before soil intrusive work is performed. All lines must be de-energized, blocked out, or blinded where feasible. Equipment shall not be ' permitted to pass within 20 feet of an overhead utility line while the boom is in the upright position. ' RIFSWP-AppF-Rev]G41I1:SRL Page F-13