Mabel Domenica Brocchini moved to Manteca in 1942 and graduated from Manteca Union High School in 1944. Mabel met Aldo Brocchini and the two were married in 1947.
Brocchini has dedicated her life to her family and the community of Manteca. For 25 years from 1962 to 1987, she served as chairman of the Manteca Chamber of Commerce Special Events Committee. She's volunteered and has played an instrumental role in numerous Manteca functions: The Christmas parade; the Fourth of July Committee; Miss Manteca Pageant Committee; Manteca Highway 120 Bypass Committee; Manteca Pumpkin Festival Committee; the Chamber Ag Tour; and literally dozens upon dozens of other civic committees.
In 1997, the chamber established the annual "Manteca Chamber of Commerce Mabel Brocchini Outstanding Community Service Award" in her honor.
She also lists among her involvements a number of other community activities including current board member and founding member of the Manteca Historical Society.
Brocchini is one of only two people in the 80-year history of Manteca to be presented a key to the city by action of the Manteca City Council.