Please click on the following links for more information:
http://www.gib.co.nz/Literature/pdf/Levels%20of%20Finish.pdf
http://www.awci.org/cd/pdfs/9004_i.pdf
http://www.wconline.com/copyright/BNP_GUID_9-5-2006_A_10000000000000109461?view=print
http://www.awci.org/cd/pdfs/0103_f.pdf