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O Special Investigations Stool for occult blood should be required on all participants. O X-Rays Chest X-Rays should be performed on all participants as a baseline. A lumbarsacral spine should be performed If recommended by the examining physician. O Vision Screening A battery (litmus) instrument should be used to screen the participant's ability to see test targets at 13-16 Inches, and at 20 feet. Tests should include an assessment of muscle balance, eye coordination, depth perception, peripheral vision, color discrimination, and tonometry. All employees who are responsible for routinely working with hazardous materials/wastes, conducting field operations are to possess at least 20/40 vision (corrected) in at least one eye. O Audio Testing Audiometry Is required on all base-line physical examinations. Testing shall be conducted by OSHA certified operators In sound- proof booths. O Pulmonary Functions Tests shall be performed on American Thoracic Society approved equipment by NIOSH certified operators. Testing includes (FVC, FLEV-1), for detection of restrictive and obstructive lung disease and chronic disorders, such as emphysema, and bronchitis. O Cardiovascular Testing A resting 12 lead EKG shall be performed on all participants over 40 years of age. An exercise EKG should be performed If indicated by history of chest pain or presence of 2 or more risk factors in males 40-65. O Biological Monitoring Industrial chemicals that might cause systemic effects are often transported by the blood systems, metabolized by enzymes, and secreted by the body. In an effort to measure exposure(s) to industrial chemicals, biological monitoring is required. To evaluate blood forming, kidney, liver, and endocrine/metabolic functions, the following blood tests are considered to be the minimum for all participants: ' Serum and red blood cell cholinesterase • Blood lead 9 -