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T , L C L, General Safety Rules for Contractors Speed Limits All vehicles on EARTH TECH job sites and facilities must observe a maximum speed limit of 10 mph unless otherwise posted. Vehicle Safety - All vehicles must be parkedin authorized areas only. - There will be no passing of moving vehicles atob sites where there are narrow roads an short -sight distances. - Vehicles will only be operated by personnel with valid licenses and; good driving records. - Vehicles shall have all required inspection and operating permits. - Seat belts shall be used. Safe Work Practices Communication Communication and coordination is vital to prevent accidents on construction sites. Every worker must be aware of equipment operating in his vicinity. Confined Space Entry Confined spaces include storage tanks, bins, sewers, in -ground vaults,d'greaser s, boilers, vessels, tunnels, manholes, its. etc. These enclosures, because of inadequate ventilation and/or the introduction of hazardous gases and vapors, may present conditions that could produce asphyxiation or injury. Before entering a confined space, Contractor must notify the EARTH TECH Representative of intent to enter. The EARTH TECH Representative will review with Contractor the safe entry requirements which include: Removal of Contents. Before entering, confined spaces should be as clean and free of hazardous materials and chemicals as possible. Where appropriate, confined spaces may be pur ed by water or other suitable means. Purging with hazardous solvents should be avoided where possible. Isolation. All input lines which discharged into the confined space shall be disconnected and capped or isolated. The use of a single in-line valve shut-off as the sole means of isolating the confined space from any input lines is prohibited.. However, the use of a double in-line valving arrangement with a vent or drain in between the two valves is acceptable provided that dangerous air contaminants are not introduced by such venting. Isolation valves shall be locked closed; vent or drain valves shall be locked open, and the key shall be kept by that person performing the job. Electrical Lockout. Where electrical devices located within the confined space (motors, switches, etc.) are to be repaired or worked on, the line - disconnect switches supplying the power must be tagged and locked in the "OFf" position. The lock key is to be kept by the person performing the job, and only this person is authorized to unlock the switch and remove the tagj�upon completion of the ob. Where more than one person is working on the �ine, each must place a lock on the switch and retain his own key. Where there are multiple sources of power to an electrical device that supplies power to the device through an automatic or manual -bus transfer switch, lockout devices must be placed on the breaker nearest to the electrical device that is to be isolated, and an electrician shall test'the power supply lines to ensure that power has been secured. Line -disconnect switches supplying .power to any mechanical apparatus in the confined space (mixers, conveyors, etc.) must also be tag.ged and locked in, the "OFF" position. This must be dohe for any entry even though work will not be performed on the apparatus itself. Securing of Covers. All manhole and cleanout covers shall be removed and the openings maintained clear of any obstructions. When hinged doors or lids are provided, .they shall be secured so they cannot close. See Excavations and Trenches for guarding requirements. Testing Atmosphere. A qualified person (NIOSH Publication No. 80-106) using only equipiment approved and tagged for Class 1, Division I locations shall make appropriate #ests of the atmosphere in the confined space and place a record of the test results at the entrance to the confined space. Testing shall ensure the following: Combustible gas and vapor concentrations do not exceed 10 percent of the lower explosive limit Oxygen content .is no less than 20 percent " and no greater than 25 percent - Appropriate respiratory protective equipment' and other. appropriate personal protective devices have been provided for all employees, when .concentrations of toxic materials exceed established threshold limit values (TLVs). Continuous Monitoring. If the nature of the work to be performed introduces, or has the potential to introduce, harmful air contaminants, continuous monitoring of the atmosphere 'and/or the oxygen content drops below 20 percent,. all personnel shall evacuate the confined space immediately. Ventilation. All confined spaces found to be unsafe must be ventilated by means of -mechanical exhaust systems arranged so' as' to avoid recirculating contaminated air. The. Contractor must contact the EARTH TECH Representative to obtain approval not to ventilate. Personnel shall be evacuated immediately in the event of failure of the mechanical ventilation system. The confined space shall be j ' GSRC-2 Revised - February 9, 1998