All high school and elementary school sites in the Manteca Unified School District will have Open Enrollment request forms available from Friday, March 1, until 3:30 p.m. on Friday, March 22.This is for families who would like their child or children to attend another campus other than the school in their designated attendance area.Last year, a total of 944 requests for transfer during the Open Enrollment period were processed, according to district records. Out of that number, only 145 were denied. The main reason for the denials: the schools were impacted.A case in point – East Union and Sierra high schools were considered impacted.