Nearly 50 Manteca Unified School District office employees will be using pedal power to and from work on Friday. Some will be pounding the pavement with backpacks on their backs to get to their destinations that day.They are among hundreds of people in three counties – San Joaquin, Stanislaus, and Merced – who are taking part in Bike to Work Week which concludes on Friday, May 18. There are several community-based organizations that are supporting this effort to “help support an environmentally friendly transportation option and promote clean air.”