Proposed $171 million Central Valley groundwater bank faces TCP contamination
Irvine Ranch Water District and Rosedale-Rio Bravo Water Storage District had just begun environmental review for their joint banking project this past April when TCP reared its head. … TCP (trichloropropane) is a carcinogenic leftover from a nematode pesticide made by Shell Oil and Dow Chemical that was liberally applied to Central Valley farmland from the 1950s through the 1980s.