I. Introduction -- II. Summary and conclusions -- III. Methods -- IV. Data analysis presentation The opacity of visible emissions from the three operating stationary sources within the Conesville Generating Station, Columbus and Southern Ohio Electric Company (C&SOE), Conesville, Ohio, was measured during the late afternoon on June 9, 1980, and during morning and later afternoon on June 10, 1980. The sources investigated were Stacks 1, 2, and 4. 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. Nine sets of opacity measurements were made, the total of which was about 1,225 individual measurements made over a total observation time of about 3 hours. The measurement sets varied in length from 11 to 30 minutes. Individual measurements were made approximately once about every 9 seconds. All opacity measurements were subsequently analyzed and reduced using the NEIC laboratory computer according to the methods given in Alternate Method 1 (proposed).