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TABLE 4 <br /> CALIBRATION AND MAINTENANCE FOR MONITORING EQUIPMENT <br /> Pacific Bell <br /> 345 N. San Joaquin Street, Stockton, California <br /> IT Project No. 190916 <br /> Monitor Type Calibration Method Calibration Frequency Maintenance Schedule <br /> Photo-ionization PID zeroed in clean air. Span PID zeroed and span checked Annual cleaning by qualified technician. <br /> Detector (PID) calibrated using known concentration daily at start of work day. Annual calibration of electronics by <br /> of isobutylene (demonstration bottle). qualified technician. Clean lamp If <br /> sensitivity drops or if used In very dusty <br /> environment. <br /> Sound Level Meter Calibrate using known noise source Calibrate meter and check Annual cleaning by qualified technician. <br /> (manufacturer supplied acoustic battery daily prior to use. Maintenance required if meter fails to <br /> calibrator). Check battery level within calibrate. <br /> recommended limits. <br /> tom05-o9-94/UsT/944)D63.T4 <br />