Error in the minimum value of the operational amplifier output
Page 3 of the spec sheet indicates that the output swing of that part is 1.3V to 22.7V nominal.  If you want it to go all the way to the rail, you need a rail-to-rail part or a negative supply.
Your first stage is probably pegged at somewhere around 0.6V (it's allowed to perform better than the spec).  The factor of 7 gain in the second stage brings it up to around 4V.