1. www.postersession.com I would like to thank Dev Jani and Chengsheng Jiang for providing me the data needed. I would like to thank Erik Svendsen, Wenjie Sun, and Francesca Edgington-Giordano for helping me with this project. I would also like to thank Lynette Perrault and Jeffrey Wickliffe for directing this great program. This work was supported by the Gulf Region Health Outreach Program (GRHOP) which is funded from the Deepwater Horizon Medical Benefits Class Action Settlement approved by the U.S. District Court in New Orleans on January 11, 2013. 1.a number of people were asked for their locations when the event occurred. 2.the data was then put into the ArcGIS software to pinpoint these people’s locations and the site of the accident on a map of Graniteville. 3.Next, HPAC software was used to model the concentration of the chlorine gas after 6-hours from release, with the AEGLs scale. 4.Finally, the maps with the geocoded locations and the plume model were combined to obtain a finally result. The plume model shows clearly how the chlorine gas had spread northeast. The weird shape of the plume model was due to the wind direction and the terrain of the location. People in AEGL 3 area are in life threatening level of exposure. People in AEGL 2 area might be victims to irreversible health effects. People in AEGL 1 area might only experience notable discomfort. Most people from the sample were not in danger of exposure. The Emergency Response Guide for large spills of chlorine at night suggests evacuation up to 5 miles for downwind areas, but the plume model goes beyond that. A explanation for this widespread of concentrated chlorine gas is that the amount of chlorine release was huge. The chlorine leak in Graniteville, SC in 2005 was the deadliest chlorine hazard in the history of the U.S. After a few years, some of the victims were asked for their locations of exposure. The releasing of chlorine and its subsequence path were model by computer software. The victims’ locations were then pinpointed on the model, so their exposure levels can be approximated. The result shows that the chlorine gas went northeast and its path was narrow. Most people from the sample were not in danger of the exposure. Methods Using GIS to Approximate the Chlorine Exposure at Graniteville, South Carolina Chengjia Yu 1.2.4, Erik Svendsen 1.3, Wenjie Sun 1.3 1 Emerging Scholars Environmental Health Sciences Academy, 2 East Jefferson High School, 3 Department of Global Environmental Health Sciences, Tulane University School of Public Health and Tropical Medicine, 4 The University of New Orleans On January 6, 2005, a train carrying tons of liquid chlorine crashed in Graniteville, SC. Deadly chlorine gas leaked into the air. Nine people died and more than 700 people were hospitalized as the result of the accident. However, the long-term health effect of the exposure is still unknown. In order to answer this question, GIS (Geographic Information System) is used to find out where were the victims and how much chlorine were the individuals exposed to at the time. Figure 1, 2, 3 and table 1 show the map created. These map show about 100 geocoded locations, the train crashed site, buffer zones and the plume model for the spread of chlorine gas 6 hours after release. The plume model shows three AEGL(Acute Exposure Guideline Levels.) for 30 minutes. Acknowledgments Abstract CHART or PICTURE Conclusions Figure #1 Introduction Results Figure #2 Number of people Percentage of the whole sample (122) AEGL 3108% AEGL 22016% AEGL 187% 5 miles away1916% 5-10 miles away3528% 10-20 miles away3226% A street map of Graniteville that shows the plume model, buffer zones, and the geocoded locations. Table #1 A street map of Graniteville that shows the plume model, buffer zones, and the geocoded locations ( a closer look). A imagery map of Graniteville that shows the plume model, buffer zones, and the geocoded locations. A table that shows the number of people and within certain areas. Figure #3