Spectrum of a sodium vapor street light

I took the Carolina $10 spectroscope outside to observe the spectrum of a sodium vapour street lamp (the orange coloured ones).  I read lines at 500 nm, 515, nm and 590 nm.  Here is the sodium spectrum

Looking at the two part spectrum the lines I observed are indicated with arrows.  I also observed some of the blue lines, but couldn't make out the position on the ruler.