Seferino Anthony Duran II
WASTE MANAGEMENT
Stockton,CA
1
Certification
24
years of professional experience
Senior Maintenance Technician and Mechanic with 20+ years of industrial maintenance experience in mechanical and electrical systems. Skilled in troubleshooting, repairing, and maintaining pumps, valves, HVAC systems, flow controls, motors, and pressurized equipment. Experienced in preventive and corrective maintenance, PLC diagnostics, electrical controls, mechanical repair, and emergency breakdown response. Proficient with hand and power tools, mechanical fabrication, OSHA safety practices, and Lockout/Tagout (LOTO). Proven ability to maintain safe, reliable equipment in demanding industrial environments.
Work History
Senior Maintenance Technician / Mechanic
8 Years 4 Months- Perform electrical and mechanical troubleshooting on fleet equipment, facility systems, and support
- infrastructure.
- Diagnose electrical issues involving motors, wiring, switches, sensors, relays, and electronic control
- components.
- Utilize electronic diagnostic tools and schematics to interpret failure codes and determine corrective
- actions.
- Conduct preventive and corrective maintenance to ensure safe, reliable operation of equipment.
- Support utilities-related systems including HVAC units, pumps, and flow-controlled components.
- Apply LOTO procedures and OSHA safety standards in all maintenance activities.
- Lead and mentor maintenance staff; provide technical guidance and task coordination.
- Estimate labor, materials, and downtime; requisition parts and coordinate external vendors.
- Inspect and verify quality of third-party repairs and rebuilds.
- Respond to emergency equipment failures and perform root-cause troubleshooting.
- Perform mechanical fabrication and modifications to improve equipment reliability.
- Act in a supervisory role during absence of direct supervision.
Trainer (Multi‑Site)
15 Years 10 Months- Traveled to multiple facilities to train employees on equipment operation, safe work practices, production procedures, and proper use of equipment.
- Provided hands-on instruction and technical support to employees across multiple locations.
- Assisted with improving training materials, procedures, and standard operating practices.
- Communicated technical information clearly to employees with varying levels of experience.
Production / Manufacturing Technician
15 Years 10 Months- Operated, assembled, maintained, and prepared large polyethylene chemical storage tanks according to customer specifications.
- Performed mechanical assembly and equipment-related tasks while maintaining quality and safety requirements.
- Operated forklifts, cranes, and heavy equipment to support manufacturing, material handling, and shipping operations.
- Inspected finished products and equipment for quality, safety, and readiness for shipment.
- Maintained clean and organized work areas and followed established safety procedures.
Shipping & Receiving Coordinator
15 Years 10 Months- Unloaded incoming trailers, inspected materials and equipment, and coordinated loading of outgoing shipments.
- Verified incoming materials and maintained accurate handling of equipment, components, and supplies.
Metal Department Lead
15 Years 10 Months- Managed ordering, inventory, and availability of hardware, metal components, tools, and materials required for manufacturing and maintenance operations.
- Assembled mechanical systems and components according to established specifications and production requirements.
- Supported equipment maintenance and performed basic electrical and mechanical troubleshooting.
- Coordinated department activities and supported safe, efficient completion of production and equipment-related work.
Education
High School Diploma
Skills
Electrical Troubleshooting (AC/DC motors
relays
sensors
switches)
Control Circuits & Electrical Panels (inspection & troubleshooting)
Preventive & Corrective Maintenance (PMs & breakdowns)
Electronic Diagnostics & Failure Code Interpretation
PLC Exposure (troubleshooting support & signal verification)
HVAC Systems (installations
repairs
PMs)
Pumps
Valves
Flow & Pressurized Utility Systems
Mechanical Fabrication & Equipment Assembly
Equipment Installation & Commissioning Support
Lockout/Tagout (LOTO) & OSHA Safety Compliance
CMMS / Work Order Documentation
Inventory
Parts & Vendor Coordination
Team Leadership
Mentoring & Training
Lockout and tagout procedures
Pump maintenance
Control panel wiring
Electrical troubleshooting
Certification
- Forklift Certification
- OSHA Safety Compliance — On-the-Job Experience
- PLC Troubleshooting — Hands-On / On-the-Job Experience
- Industrial Electrical Systems & Controls — On-the-Job Experience
CORE MAINTENANCE QUALIFICATIONS
- Mechanical & Electrical Equipment Maintenance
- HVAC Systems & Equipment
- Pressurized Systems & Industrial Utilities
- Hand & Power Tools
- Maintenance Documentation & Work Requests
- Technical Training & Mentoring
- Preventive & Corrective Maintenance
- Equipment Inspection & Repair
- Parts, Materials & Inventory Coordination
- Pumps, Valves & Flow-Control Systems
- Motors, Sensors, Relays & Control Circuits
- PLC-Assisted Troubleshooting & I/O Diagnostics
- Mechanical Fabrication & Assembly
- OSHA Safety Practices & Lockout/Tagout (LOTO)
- Vendor & Contractor Coordination
ADDITIONAL QUALIFICATIONS
- Extensive industrial maintenance and mechanical experience with strong troubleshooting and problem-solving abilities.
- Able to work independently and as part of multidisciplinary maintenance teams.
- Effective communication with supervisors, technicians, engineers, vendors, and other personnel.
- Experienced responding to urgent equipment failures and completing corrective repairs.
- Experienced following written procedures, technical instructions, and safety requirements.
- Strong commitment to safe, reliable, and efficient equipment operation.
References available upon request
Timeline
Senior Maintenance Technician / Mechanic
WASTE MANAGEMENT
04.2018 - CurrentRead More
Trainer (Multi‑Site)
Poly Processing
06.2002 - 04.2018Read More
Production / Manufacturing Technician
Poly Processing
06.2002 - 04.2018Read More
Shipping & Receiving Coordinator
Poly Processing
06.2002 - 04.2018Read More
Metal Department Lead
POLY PROCESSING
06.2002 - 04.2018Read More
Franklin High School
High School Diploma
Read More