Section 62.15380 - How must I monitor opacity for air curtain incinerators that burn 100 percent yard waste?(a) Use EPA Reference Method 9 in appendix A of 40 CFR part 60 to determine compliance with the opacity limit.(b) Conduct an initial test for opacity as specified in § 60.8 of subpart A of 40 CFR part 60.(c) After the initial test for opacity, conduct annual tests no more than 13 calendar months following the date of your previous test.