where can i find environmental engineering statement of purpose samples?

i am applying for postgraduate study and need help writitng a statement of purpose

Here are a couple that might help you out.

http://www.andrew.cmu.edu/user/rafranci/index_files/page0001.html

http://www.essayedge.com/graduate/essayadvice/course/essay13.shtml

http://alumnus.caltech.edu/~natalia/studyinus/guide/statement/samples.htm

Hope these help.