Even though he's spent a year in Chile, Grass Valley resident Mark Graziano is still expecting culture shock when he heads to Bolivia in January as a Peace Corps volunteer. He's expecting to live with the "poorest of the poor" in a rural village with no electricity or hot water. "They'll be tough conditions to adjust to, but I'm flexible. I think I'll be able to adapt," Graziano said.Having majored in Spanish and Latin American studies at Sonoma State University, Graziano will be able to converse with most Bolivians.But he'll be confronted with the challenge of teaching subsistence farming with …