Detroit contractor Gayanga closes after 235 sites tied to contaminated dirt, sues city

Gayanga Co., a Detroit demolition contractor accused of backfilling sites with contaminated dirt from Iron Horse of Michigan, announced it is closing and filing a defamation suit against the city Office of Inspector General and investigator Kamau Marable. The company had been suspended from city work last September, with the suspension lifted in March under a 180-day debarment limit. City data links 235 properties to Gayanga among 533 suspected contaminated sites, and officials are weighing a $4.5 million contract with Mannik & Smith Group for testing.