I am working on a map of 60+ monitoring wells and I plotted them through an excel data sheet and a few tools. In that data sheet, I have Benzene concentrations associated with almost each point. I need to have the ones that are above SHS to be green and the ones that are below SHS to be red. I have tried setting up SQL Query a few times and also tried selecting by attribute, but every time it only selects one or two points when it should be selecting 12 points (7, 17, 23, 25, 37, 58, 140, 180, 230, 270, 280, 1100), I've tried a few different queries including "Benzene" > '5', which selected 2 points (7 and 58), "Benzene" >= '7', which selected one point (7). I tried selecting by attribute and only 7 was selected every time. Also, when I've tried doing the opposite in label editor ( "Benzene" <= '5', it says it is a valid expression, but all the numbers above 5 are still showing up green). 

What am I doing wrong? 

My benzene column is a String.