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3. 1. 3 Eye and Skin Absorption (continued) Contact of chemicals with skin or eyes can be avoided if workers wear personal protective equipment, such as Tyvek suits , safety glasses/chemical goggles , gloves , and boots_ 3. 1. 4 Inhalation Foreign material may be inhaled and come into direct contact with lung tissue. This may cause an adverse effect on the lung tissue which, if not irreversible, may persist for a long time before the damage can be repaired by the body. The foreign material may also enter the bloodstream, all sensitive organ systems may be affected including the brain, heart , liver, kidneys , and reproductive organs. Entry of a chemical into the bloodstream may occur rapidly. Foreign materials that may be inhaled include volatile chemicals and particulate (dust) that may contain or consist of nonvolatile hazardous substances. Inhalation of dust or chemicals can be successfully avoided by using respirators fitted with proper cartridges and by eliminating downwind work stations where possible, 3. 2. 1 Mechanical Hazards Common mechanical hazards are present around heavy equipment, in or around excavations , and in places where heavy objects may cause injury by falling on the worker, including excavations that may be subject to cave-in. Any ,lob that places a worker in a position where that worker may be injured by falling, such as working on a catwalk or ladder, also involves a mechanical hazard. The SSO will correct such hazards or institute precautionary measures once they are identified. Heavy equipment used during proposed field activities may include excavators , cranes and transportation trucks. Only trained or experienced personnel will operate machines , tools and equipment employed in the removal operation. All machines and tools will be cleaned regularly and maintained in good repair. All moving parts will be securely fastened or covered when not in use. The use of PPE will be required around any heavy equipment and will include hard hats , steel toe boots and eye protection. Hearing protection such as ear plugs will also be available. In areas where operating heavy equipment can create a chemical or health hazard, appropriate protective clothing and respirator protection will also be used. 3. 2. 2 Electrical Hazards All electrical equipment to be used during field activities will be properly grounded. Only qualified persons will work on electrical equipment and all equipment will be maintained in safe condition. Any portable or movable towers involved in this UST removal operation will be located a minimum of 10 feet from electrical power lines ( 50 ,000 volts or less ) unless such lines have been de-energized. Utility companies (such as PG&E ) and/or