SACRAMENTO - More agency collaboration and funding is needed to address the widespread pollution of public lands and waterways in California, state Assembly leaders concluded at a joint hearing held at the capitol Tuesday. But where the money will come from to pay the hefty cost to clean up mercury, arsenic and asbestos left behind by Gold Rush-era miners remains to be seen."We are again faced with cleanup costs with no source of revenue," said 8th District Assemblywoman Lois Wolk. The cleanup is "a multi-billion dollar issue," said Dennis Geiser, a Forest Service environmental engineer.Money set aside for cleaning the …