"October 1980."

I. Introduction -- II. Summary and conclusions -- III. Methods -- IV. Data analysis presentation The opacity of visible emissions from the two stationary sources with in the Olin Corporation facility, Covington, Indiana, was measured during early morning and afternoon hours on June 12, 1980. The sources investigated were the East Stack and the West Stack. All measurements were conducted remotely from off the plant site. Opacities were measured remotely with the NEIC Omega-1 Lida which is a new instrumentation method. The method has been proposed in the Federal Register as Alternate Method 1 to Reference Method 9. Eleven sets of opacity measurements were made, the total of which was about 3.1 hours of observation and about 1,180 individual measurements. The sets of measurements ranged in length from 14 to 29 minutes. 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).