Once the largest concentration of dairy cows in the United States, the San Bernardino County Dairy Preserve is on the verge of becoming home to more than 200,000 people. The City of Chino is finishing work on a specific plan for 5,435 acres, and City of Ontario officials are refining a development fee schedule, the last document needed before the city begins processing development applications for 8,200 acres on the south end of town.