STOCKTON — A large sinkhole developed on a busy commercial section of West Dr. Martin Luther King Jr. Boulevard early Sunday morning and took most of the day to repair.A break in an 8-inch water main under the westbound lanes between South Lincoln and South Harrison streets was first reported about 3:30 a.m., forcing the closure of the lanes until after sunset for safety reasons, according to California Water Service Co.Cal Water construction superintendent Tammy [...]