By Lisa Iesse Writer HAMILTON – The City of Hamilton is heading to court next month pressing an ultimatum asking Ontario to block the Haudenosaunee Development Institute’s (HDI) intervention in the Chedoke Creek clean-up. The city’s new court hearing, wants Ontario to force the HDI out of the environmental consultations. The city plans to present the court with an ultimatum to exclude HDI or to extend the Chedoke Creek clean-up deadline again. Tim Gilbert, HDI’s lawyer, has said the city’s moves are unnecessary. “The Haudenosaunee people will exercise their treaty rights but will not block access to the site, prevent any dredging work, nor cause a work stoppage,” he said in a new letter to the city and the province. In the letter, HDI questioned the city’s application for a…