The Empire Mine State Historic Park has been fined $138,000 after failing to meet a deadline to clean up the Magenta Drain, a polluted creek that flows into Veterans Memorial Park in Grass Valley.And they face an estimated total penalty of nearly $500,000 before they complete a remediation project for the stream.But the delay caused by a decision to use a passive treatment system will end up saving the state $2 million in construction costs and more than $32 million over the life of the system, according to a state parks spokesman.The California Regional Water Quality Control Board issued two …