A year-long investigation prompted by a double murder at the Pelham Parkway Houses in the Bronx culminated in a major drug bust yesterday. Narcotics and other units armed with arrest warrants raided the project around 6 a.m., arresting suspects in their apartments. 27 arrests were made, and investigators seized 800 bags of crack, a gram of heroin and 100 bags of marijuana. Resident Marlene Rodriguez told the Daily News, "There's a lot of good people here just trying to live their lives. They need to clean these places up." But one 71-year-old who has lived in the complex for 35 years wasn't impressed. "They got rid of them?" she said. "They'll be right back out here. Isn't that always the case? It's always the case."