How to take split ratio into account when calculating final desired concentration of internal standard or surrogate standard in method

I run a method that requires 30 ng of bromofluorobenzene (bfb) on column to meet the method's tune check spectral evaluation.  I have been preparing IS/SS secondary standards from stock standards according to calculations from a former operator of the system.  I notice the calculations do not include anything for split ratio.  I use an ATOMX purge and trap with the IS/SS prepared standard being autoinjected into the water sample.  Once the x uL of IS/SS mix is injected into x mL of sample, in order to achieve the desired ng of bfb on column, should I be dividing this number by the split ratio?  

Thank You.  

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