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5/8/24,10:06 AM <br />securesite.mainstream-engr.com/epa/tcc,jsp?examType_id=6080B <br />Mainstream Engineering Corporation <br />By this Certificate Warrants that <br />DONNALD CRAVALHO <br />has shown competency and fitness to practice Refrigerant Recycling, Recovery and Reclamation and has complied with all requirements of <br />the Environmental Protection Agency Clean Air Act; therefore by virtue of the powers vested in Mainstream Engineering Corporation by the <br />U. S. Environmental Protection Agency, Mainstream Engineering Corporation hereby issues this <br />EPA Section 608 Type I Open Book Certification <br />Certification Number: <br />85490E928B6333C50 <br />as Required by 40 CFR Part 82, Subpart F subject to the powers of revocation by the EPA. <br />Print Certificate <br />https://securesite.mainstream-engr.com/epa/tcc.jsp?examType_id=60806 1/1 <br />