An environmental assessment of all 28 acres in and around Colonia High School found no traces of radiological contaminants, according to a document from Woodbridge officials obtained by NJ Advance Media. The probe was the result of concerns about a possible brain tumor cluster linked to graduates and staff members from Colonia High. Earlier this spring, Al Lupiano, a 1974 graduate, discovered 119 people with ties to the school who say they have had a primary brain tumor. Lupiano’s findings prompted the Woodbridge Municipal Council to approve an emergency contract with an environmental consulta…