As garbage pickup begins to stabilize in the Uptown and Mid-City neighborhoods, city officials are looking at why the basic city service collapsed in recent months. As bins spilled over with garbage and languished on the curb, the city’s 311 system recorded 3,638 sanitation complaints within the first 19 days of January alone. District A Councilman Joe Giarrusso said in a recent newsletter that his office received close to 400 complaints in the past few weeks over missed trash and recycling pickups. Most of those complaints were in the areas served by Richard’s Disposal. Owner Alvin Richard, a four-decade veteran of the local disposal business, appeared before a recent the City Council’s Community Development Committee to answer questions about the missed pickups, a problem that came to a head over the holidays.