we score our   chimacum creek from bug  if they are  very intolerant ,intolerant,and very tolerant,tolerant. like you see on the top is per 5 so thank you per 5 and if its very intolerant =4 ponits like mayfiles and stonefiles.  intolerant=3 ponits riffle bettles . Very tolerant=2.ponits are like  scuds,sow bugs , black files. Tolerant= 1 ponits blood worms ,flat worms,leeches .So per 5 got 21 ponits all .And period 6 only Got 11 ponits .Chimacum Creek Got 21 Ponits And Yellowjacket Creek got 25 Ponits i bet you are asking  how  do you score i dont understand ?well i wiilll tell you  ummm...............  oh yeah   if bugs are very intolerant or intolerant or very tolerant or tolerant.So You can tell that yellowjacket creek is cleaner then chimacum creek is dirrty