St. Patrick's Day was three months ago, but only now is the city getting around to dyeing the East River green. The Office of Emergency Management has announced that the DEP will conduct a "Dye Test" at 51st Avenue and 2nd Street in Long Island City at 10 a.m. this morning. We're waiting for the DEP's press liaison to explain why they're doing this, but in other cities, such tests are sometimes used to monitor the dispersion of effluent from sewage treatment plants. OEM says the "non-hazardous green dye will be visible in the East River." (It's unclear how this will coloration will differ from other days.)