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Won WOW S � no M Q" Io an <br /> TABLE 4 <br /> CALIBRATION AND MAINTENANCE FOR MONITORING EQUIPMENT <br /> Van Den Bergh Foods Company <br /> 1400 waterloo Road, Stockton CA <br /> IT Project No 760691 <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 tamp 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 fads to <br /> calibrator) Check battery level within calibrate <br /> recommended limits <br /> MZtJ 1-28-94/RHS/HASP/94-00371'4 <br />