10nl: Valuebet river in blind battle?

[Lurker.]

Just sat down at the table so no real reads. I think i should have 3bet preflop though. Thoughts on all streets.
Stacks are 100bbs effective.
Preflop: 4 folds, sb raises to $.30, hero (bb) calls with A [img]/images/graemlins/club.gif[/img]10 [img]/images/graemlins/spade.gif[/img]
Flop: 10 [img]/images/graemlins/diamond.gif[/img]9 [img]/images/graemlins/heart.gif[/img]3 [img]/images/graemlins/spade.gif[/img]
sb bets $.60, hero calls
Turn: 5 [img]/images/graemlins/diamond.gif[/img]
sb bets $1.50, hero calls
River: 3 [img]/images/graemlins/club.gif[/img]
sb checks, hero?