LONG BEACH—As many as 150 migrant children were expected to arrive at the Long Beach Convention Center April 22, beginning its operation as a shelter that will house unaccompanied minors from the U.S.-Mexico border until they can be reunited with family or placed with sponsors. According to the U.S Department of Health and Human Services, the children will receive medical checks, clothing, toiletries, food and snacks. Long Beach Mayor Robert Garcia said they will also receive schooling and have recreational opportunities. “We absolutely should ensure that these facilities are quality and are places that are focused on the child and are really centered around helping,” Garcia said. He noted that the migrant children often are arriving at the U.S.-Mexico border “with no parents, no adults. They don’t have their family with them.” Such unaccompanied children can then wind up in detention facilities. “These humanitarian shelters are opening up here in …