A federal judge on Tuesday kept alive some of the civil rights claims asserted by a truck driver against his former co-workers at the Metropolitan Water Reclamation District of Greater Chicago.U.S. District Judge Manish S. Shah threw out plaintiff Dann Grillo’s claims that the district had an unwritten “policy and practice” of failing to investigate and discipline employees who discriminate against others.“The complaint’s factual allegations show, at most, that two employees discriminated …