Don't appologize for me. ...

Don't appologize for me.  One should not encourage to those who go on the net instead of getting out a book and learning. Go back to basic analytical chemistry and study.  Keep in mind, that you have to calibrate instruments, or you can not rely on the readings.  Want to measure something without dilutions?  Wow, not with cocentrated solutions.  In some situations, titrations are best.  

Perhaps the real problem is the difference between the chlorine applied and the expected results? If so, keep in mind that chlorine can be consumed by the contamination in the water, making the tested results lower than expected.  

Keep your eyes on the question: "...cannot actually measure the percentate of Chlorine in Sodium Hypochlorite before use..."  

Wrong!  This is done as standard practive.  He should know that.  He is just lazy!

 Read up on the Hach DPD analysis, and the test ranges.