President Joe Biden’s $5.8 trillion spending plan for the 12 months beginning Oct. 1 would increase funding for Amtrak, restore the expanded Child Tax Credit, and spend more than $1 billion cleaning up contaminated Superfund sites. The second budget of the Biden administration reflected the infrastructure spending already approved by Congress as well as provisions in his stalled social spending bill. The spending plan, which will undergo numerous changes on Capitol Hill, reflects the priorities of the 46th president, which also include raising taxes on the richest Americans and taking steps to…