Need confirmation WRT units. Assuming the calcium and magnesium numbers are hardnesses i.e. that the total hardness is 150 then things are pretty nominal and the profile would balance with about 65 mg/L chloride assuming there is no appreciable sodium which there very well might be. OTOH if the calcium and magnesium numbers are mg/L it would take about 148 mg/L chloride to balance and that is quite a bit. Again, the presence of appreciable amounts of sodium would require even more chloride. A third, but remote, possibility is that the sulfate is 'as sulfur'. In this case the balance is much better in which case 35 mg/L Cl- would balance things, again dependent on sodium level.
So really can't tell much until I'm sure of the units.