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the excavation and work area. The excavation ontractor is free to choose the most practical design approach for any particular circumstance. Once an approach has been selected, however, the required performance criteria must be met by that system. 3.4 Underground Utilities Type(s)/Source: Electrical,water, sew r, etc. Qualified Exposure Risk: Moderate—Soil saml iling(direct-push/hand-auger/backhoe) Hazard Control: Isolation—contact USA,independent Utility Locator Hazard: Contact with electrical current can cause shock, electrical burns, and/or be instantly fatal. If heavy equipment (e.g., drill rig) makes contact with electrical wires, it may or may not be insulated from the ground by the tires of the carrier. Under either circumstance, the human body, if it simultaneously comes in contact with the drill rig and the ground, will provide a conductor of the electricity to the ground. Controls : Demarcate all drilling/digging locat ons, first. Contact Underground Service Alert (USA) (1-800-227-2600) and review as-built plans before performing any excavation/drilling/coring activity. It is advised that a private utility locator be conActed to supplement USA's demarcations, especially ` when the project is on private property. Soil intrusive work shall not proceed until all locating activities have been completed and fully documented in the site records. The initial site safety orientation ., meeting for all personnel onsite shall include a review of the underground utility locations and the location of the site map, showing the position of any underground utility lines. The site safety orientation shall include a site walkover of each inarked utility or line. Should a sub-surface condition be encountered that creates suspicion that there may be an unidentified ` underground line or utility, immediately cease work and secure the equipment. Work will not proceed until the potential risk or condition is resolved. �. 3.5 Noise Hazards Equipment operated at sampling sites may preset a noise hazard to employees. In all cases where the sound pressure levels may exceed a time-weigited average noise dose of 85 decibels (the Action Level), the Project Manager will evaluate expo ures according to the Geocon Hearing Conservation Program (ref. T8 CCR §§5095-5100). Selection of hearing protection will be made in accordance with the Geocon Safety Equipment Guide. Only hearing protectors (ear plugs or muffs) with a Noise Reduction Rating of 20 dB, or higher, will be us d. When worn, earmuffs will be donned in the "over 6. the head"position with the hair pulled back from the sealing surface. Note: In general, noise levels in excess of E 5 dBA interfere with communication between two individuals speaking in a normal tone of voice at i.distance of 3 feet from one another. Linden UST Sl and Removal,Task Order No.34 Caltrans Contract 06A1895,EFTS 10-1300-0181-0 Geocon Project No.59800-01-34 -9- October 2013,Revised September 2014 L