The owner or operator of a cement manufacturing installation may not cause or permit the discharge of emissions which exceed the visibility standards in §B of this regulation. Visibility Standards. In Areas I, II, V, and VI a person may not cause or permit the discharge of emissions from any installation or building, other than water in an uncombined form, which is greater than 20 percent opacity. In Areas III and IV a person may not cause or permit the discharge of emissions from any installation or building, other than water in an uncombined form, which is visible to human observers. Compliance with the visibility standards of §B(1) and (2) of this regulation shall be demonstrated by a visible emission observation using Method 9 of 40 CFR Part 60. Visible Emission Monitoring Requirements for Cement Kilns. The owner or operator of a cement kiln at a Portland cement manufacturing plant shall either: Use a COM in accordance with the requirements of COMAR 26.11.01.10; or Use a PM continuous parametric monitoring system (CPMS) to establish a site-specific operating parameter limit for continuous visible emission compliance determinations in accordance with Regulation .04C of this chapter. Visible Emission monitoring requirements for clinker coolers. On or after September 1, 2016, the owner or operator of a clinker cooler at a Portland cement manufacturing plant shall either: Use a COM in accordance with the requirements of COMAR 26.11.01.10; or Use a PM continuous parametric monitoring system (CPMS) to establish a site-specific operating parameter limit for continuous visible emission compliance determinations in accordance with Regulation .04C(1)—(5) of this chapter.