The city wants to hire a second municipal hearing officer to adjudicate violations of the fire and building codes, after the current hearing officer missed an annual training session. The stop-gap measure, if approved by Mayor Gary Christenson, will cost the city $6,000, temporarily doubling the taxpayers’ cost to ensure fire and building code enforcement. Danielle M. Hender, a Malden lawyer and the current hearing officer, is trained only in the administration and evaluation of health code cases. Hired in July 2010, Hender missed an opportunity to take a training course in March of this year. She is paid a $6,000 annual stipend, according to the city. The oversight surfaced during a reorganization of Malden government after Christenson took office in January. “I'm gambling my budget,” said Christopher Webb, the city’s director of public health. “But I don't care about the money. I want these inspectors to properly enforce these citations.”