"October 1980."

I. Introduction -- II. Summary and conclusions -- III. Methods -- IV. Data analysis presentation The opacity of visible emissions from the one stationary source within the A.B. Brown Generating Station, Southern Indiana Gas and Electric Company (SIGECO), West Franklin, Indiana, was measured during late morning and early afternoon hours on June 17, 1980. The source investigated was the Unit No. 1 Stack. All measurements were conducted remotely from off the plant site. Opacities were measured remotely with the NEIC Omega-1 Lidar which is a new instrumentation method. This method has been proposed in the Federal Register as Alternate Method 1 to Reference Method 9. Five sets of opacity measurements were made, the total of which was about 1.25 hours of observation and about 460 individual measurement. The sets of measurements were 15 minutes in length. Measurements were made at a temporal frequency range from once about every 8 to 10 seconds. All opacity measurements were subsequently analyzed and reduced with the NEIC laboratory computer using the methods given in Alternate Method 1 (proposed).