- Welcome to Our ESL Web Site The ESL program at San Joaquin Delta College in Stockton, California, is designed to improve the communication skills of students who speak English as a second language. The ESL classes, which begin at the introductory level and go all the way to the advanced level, can help students prepare for the demands of the workplace or the challenges of college. Our ESL ...esl.sjdccd.cc.ca.us