* Trading revenue nearly doubles

* $6.65 billion set aside for compensation

* TARP repayment results in $426 million charge

* CFO says "hard to know" if Q2 results sustainable

* Shares finish day's trade up. (Adds comments from lawmakers)

By Steve Eder and Joe Giannone

NEW YORK, July 14 (Reuters) - Goldman Sachs Group Inc (GS.N: Quote, Profile, Research) said quarterly earnings surged 33 percent on blowout trading results, trouncing forecasts and putting the bank on pace for hefty bonuses that could draw unwanted scrutiny.

The results continued Goldman's extraordinary rebound from a near meltdown of the U.S. banking industry last fall that led to a $125 billion taxpayer bailout for its largest members.

Goldman set aside $6.65 billion for salary, bonuses and benefits in the quarter, up by nearly half from the quarter ended in May last year.