Violations: Certified mail to mailing address (returned unclaimed) – 2nd notice certified mail to street address (unclaimed) and 1st class mail (not returned) – 3rd notice faxed to number on respondent's RIN application form Service by certified mail is considered served when mailed. No reply. Default. Did not calibrate equipment Did not complete/maintain retest records Did not retest at minimum pressure in exemption Did not provide training