(Correcting rise in Goldman shares on Monday to 5.3 percent from 2 percent, in 9th paragraph)

* 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 little changed in midday trading (Adds Viniar comments from interview)

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 expectations and putting the bank on pace for windfall bonuses that could draw more unwanted public scrutiny.

The results continued Goldman's extraordinary rebound from the near meltdown of the U.S. banking industry last fall.