Even though the Grass Valley school board postponed approval of a response Tuesday night to a report that claims the district's previous superintendent received unauthorized salary increases that "spiked" his retirement fund, the unapproved draft response reveals much about the district's stance on those allegations. In the unapproved draft response to the Nevada County Civil Grand Jury, the Grass Valley School District disagreed that former Superintendent Jon Byerrum's first 2008 salary increase, from $116,720 to $121,388, was not authorized. On the other hand, the district did agree that his second pay raise to $134,227, as well as his 2006 cash-in-lieu …