Which of the following statements are false concerning audiometric testing of workers exposed to noise?
1) A worker's audiogram can be used to evaluate hearing conservation methods.
2) The baseline audiogram is used to compare against subsequent audiograms to determine if there has been a standard threshold shift.
3) OSHA requires a 10 dBA loss in either ear averaged over the frequencies of 4,000, 5,000 and 6,000 hertz for the loss to be considered a Standard Threshold Shift.
4) A baseline audiogram must be provided on-site after one year of an employee's first exposure to workplace noise at or above an 8-hour TWA of 85 dBA.