Respondent was assessed a civil penalty of $3,420 for two violations of the HMR when it failed to (1) assure the accuracy of its retest equipment at pressures within 500 psi of the pressures at which it retested and requalified compressed gas cylinders and maintain complete and accurate records of calibration, and (2) inform its motor vehicle operator of the requirements of the materials of trade exception.  Two alleged violations (Nos. 1 and 5 combined).  Two alleged violations dismissed.