First of all, the members of the Trash-Site Safety Council are not listed, which could make a big difference in the believability of the study. A truly independent council could produce results that could be considered much more reliable than one with members with possible conflicts of interest. However, if the council were made up mainly of people who have an interest in finding that there is no problem with the trash sites - homebuilders or city councilmen, for example - then the study would lack some credibility. Without knowing the backgrounds and priorities of the council members, the argument is greatly weakened.
Secondly, this was cited as a statewide study, but only five sites and three hundred people were studied. Although on average there was only a small statistical correlation shown between the nearness of the trash sites and the homes and people who lived in them, the margin of error could be quite large due to studying only a small sample of people that live near the trash sites in the state. It would be much more persuasive were a large majority of the homes and people near trash sites studied rather than merely a small percentage.
Furthermore, the study cites only unexplained rashes as a health-related problem with some statistical correlation. The presence or absence of other types of health problems is not mentioned in the study. It could be that there were other, perhaps not immediately noticeable health problems such as cancer affecting the people living near the sites. Additionally, the study appears to cover only one moment in time, or at least the duration of the study is not discussed. Perhaps there are long-term effects that cannot be discovered by a study conducted over a short period of time. This weakens the argument by leaving out information that could help to persuade the reader one way or another.
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