A total of 40 states of 31Si in the region of excitation from about 5 to 9 MeV have been studied using the reaction 30Si(d ,p) at 10 MeV incident deuteron energy, and a biased quadrupole spectrometer. Fractionated single-particle states are identified via their forward-angle cross sections, using distorted-wave Born-approximation predictions with bound and resonance state form factors for the residual 31Si system. Results are contrasted with what is known of the lower lying states, from large-basis shell-model calculations and earlier (d ,p) experiments. NUCLEAR REACTIONS 30Si(d ,p), Ed=10 MeV, measured σ(θ). 31Si deduced levels, l, j, π, spectroscopic factors. Enriched target.