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Maintenance & Operations 
1313 Valley Blvd., Colton, CA 92324 (909) 580-5008

The Maintenance & Operations Department plays a crucial role in supporting the educational mission of the Colton Joint Unified School District. Our work directly impacts student success by providing a clean, safe, and well-maintained learning environment. We are committed to creating a positive and productive atmosphere for all members of our school community.

Staff_M & O
Maintenance & Operations Administrative Staff Directory | maintenance@cjusd.net 
 

Manager of Maintenance & Operations
Patrick Yamakawa            (909) 580-5008 ext. 5344
 
Maintenance & Operations Supervisor II
Ralph Duran                    (909) 580-5008 ext. 5342
 
Maintenance & Operations Supervisor II 
Phillip May                      (909) 580-5008 ext. 5363
 
Maintenance Supervisor
Harry Arensberg             (909) 580-5008 ext.5347
 
Maintenance & Operations Supervisor I
Bruno Granillo                (909) 580-5008 ext.5351
 
Maintenance & Operations Supervisor I
Ernesto Arriola                (909) 580-5008 ext.5348
 
Grounds Supervisor
Moises Rodriguez           (909) 580-5008 ext.5349
 
Accounting Technician
Santos Menendez           (909) 580-5008 ext.5343
 
Office Assistant
Ariana Payan                  (909) 580-5008 ext.5344
 

 

David Bell

Director, Maintenance & Operations

Sonia Diaz

Administrative Assistant, Maintenance & Operations

School Dude Work Order