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6.4.2 Noise Results primarily form concrete breaking and excavation equipment, and other machinery. Workers will wear ear plugs when operating heavy machinery to avoid noise that may exceeded the 85 decibel Threshild Limit Value (TLV) established by the American Conference of Government Industrial Hygienists. However, based on previous field experience, expected noise level should not exceed 85 decibels. 6.4.3 Electric Shock All electrical equipment to be used during field activities will be suitably grounded and insulated 6.4.4 Heavy Equipment Hazards related to excavating and soil sampling necessitate securing the work area. All relevant requirements pursuant to 29 CFR 1926.602 and Subpart W, Rollover Protective Structures, Overhead Protection, shall be observed during the course of excavation and soil sampling activities. All field personnel not directly involved in the excavation work will be kept at safe distances from areas where heavy equipment are in use. Unauthorized visitors will not be permitted near areas where heavy equipment are in use regardless of whether the area has been designated as an exclusion zone. 6.4.5 General Safety All SANACI' and contractor / subcontractor personnel will wear approved head protection while working around heavy equipment in the site area Fire hydrants, electrical, and underground lines and pipes will be identified before excavation operations begin. Two 10 pound fire extinguishers will be kept on site near the exclusion zone. 6.5 Entry Procedures At a minimum, all visitors entering the exclusion zone must wear the protective clothing and equipment worn by SANACr and contractor / subcontractor personnel. Permission to enter the work area must be obtained from at least one of the personnel named in Section 4.0. Each visitor's name and purpose of visit will be recorded in the field nares.