However, Yeh points out that the Chutung area's geology is igneous, and therefore naturally contains a number of heavy metals. Whether the park's stratum has been affected by these metals or other factors is awaiting investigation.
不過葉弘德指出，竹東地區火成岩，含有多種重金屬，園區地層是否受它或其他因素影響，有待查證。