. Bulletin. Natural history; Natural history. 694 Illinois Natural History Survey Bulletin Vol. 32. Art. 4 each month from October 1973 through August 1974 (except December 1973) with BGI Model IIA high-volume air samplers. Two samplers were positioned approximately 5 and 10 km downwind and one approximately 5 km upwind from the power plant. Since the samplers were placed under the smokestack plume on the day of sample collection, reloca- tion of the samplers was necessary for each collection. This relocating in turn necessitated recalibration of the samplers after they were transported. The o
. Bulletin. Natural history; Natural history. 694 Illinois Natural History Survey Bulletin Vol. 32. Art. 4 each month from October 1973 through August 1974 (except December 1973) with BGI Model IIA high-volume air samplers. Two samplers were positioned approximately 5 and 10 km downwind and one approximately 5 km upwind from the power plant. Since the samplers were placed under the smokestack plume on the day of sample collection, reloca- tion of the samplers was necessary for each collection. This relocating in turn necessitated recalibration of the samplers after they were transported. The opera- tional parameters for the air samplers are shown in Appendix A (Table Al). The particulate matter was collected on x mats of high purity glass fiber with a collection efficiency of per- cent of dioctylphthalate (DOP) particles. After the mass of the par- ticulate matter collected was determined, the mats were cut into eight approx- imately equal, wedge-shaped sections for analysis. In the later collections for metals other than mercury, seven similar high-volume air samplers were located permanently northeast of the power plant along an arc with a radius of approximately km, a distance between those used in the first collections, and as close as feasible to electrical service. Permanent locations eliminated the need to recaUbrate the samplers before every sample. Two addi- tional samplers were placed southwest of the power plant to sample the air prior to its passing the Kincaid Generating Sta- tion (Fig. 1). Samples were taken monthly during a single 24-hour period using the same type of glass fiber mats as those described above. The time periods selected were based on local weather con- ditions, , wind from the southwest, ex- pected wind direction stability for 24 hours, and no precipitation. Such condi- tions were found in January, April,' May, June, July, August, October, and November 1975. Further attempts to gather samples were ter
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