Plant Manager I

Martin Marietta Materials, Inc.; Concord (CA); On-site; USD 140,000 - 190,000; Full time

Benefits offered by this job

Medical

Dental

Vision

401(k) with company match

Pension

Paid Holidays and Vacation

Job summary

Martin Marietta is seeking a Plant Manager in Concord, CA to lead daily operations of an aggregate production facility, driving safety, quality, and efficiency. You will manage budgets, coordinate maintenance, and ensure regulatory compliance while guiding a team of hourly staff and contractors.

The role emphasizes delivering consistent product quality, optimizing throughput, and maintaining safe, compliant operations in a dynamic quarry or sand-and-gravel setting.

Qualifications

• MSHA compliance and regulations understanding.
• Knowledge of aggregate processing equipment and pit design.
• Experience with welding, repairs and maintenance of mobile processing equipment.
• Strong problem solving and leadership abilities.
• Excellent communication and organizational skills.

Responsibilities

• Oversee day-to-day plant operations and ensure safety, production, quality, and environmental goals are met.
• Lead safety culture and routine site inspections; enforce regulations.
• Manage production processes and KPIs (TPH, downtime, yield) to identify bottlenecks.
• Develop and manage plant/Mobile equipment PM programs to minimize downtime and extend asset life.
• Plan maintenance shutdowns and coordinate with maintenance teams and vendors.
• Control operating budget, labor costs, and procurement; implement cost-saving measures without sacrificing safety or quality.
• Collaborate with Quality Control to ensure ASTM, DOT, and customer specs are met.

Skills

MSHA compliance

Aggregate processing equipment

Welding and maintenance

Critical thinking

Technical aptitude

Business acumen

Effective communication

Time management

Process management

Detail oriented

Delegation

Quality control methods

Education

High school diploma, GED, or relevant experience

5+ years in Aggregates/Heavy Construction with supervisory experience

Job description

The Plant Manager is a foundational leadership role responsible for the day-to-day management of a specific aggregate production facility (quarry or sand and gravel operation). This individual provides strategic and tactical oversight to ensure that safety, production, quality, and environmental goals are met or exceeded. The Plant Manager is the primary driver of the Guardian Angel and Wingman safety culture on-site. Your focus is on optimizing plant efficiency, maintaining cost control through effective budgeting, and ensuring the final product meets both customer specifications and Martin Marietta's rigorous quality standards.

Key Duties and Responsibilities

• Champion the "Guardian Angel" culture by ensuring all employees, contractors, and visitors adhere to MSHA and company safety regulations.
• Conduct regular safety meetings.
• Maintain 100% compliance with all local, state, and federal environmental regulations (air quality, water discharge, and reclamation permits).
• Lead routine site inspections to identify and mitigate hazards, ensuring all mobile and stationary equipment are in safe working condition.
• Oversee the entire production process, including stripping, drilling, blasting, hauling, crushing, screening, and stockpiling.
• Monitor key performance indicators (KPIs) such as tons per hour (TPH), downtime, and yield to identify bottlenecks and implement process improvements.
• Manage raw material and finished goods inventories to ensure adequate supply for sales forecasts and customer demand.
• Develop and oversee a robust PM program for the plant and mobile equipment to minimize unplanned downtime and extend asset life.
• Plan and execute scheduled maintenance shutdowns, coordinating with internal maintenance teams and external vendors.
• Work closely with the Quality Control department to ensure all aggregate products meet ASTM, DOT, and customer-specific technical requirements.
• Monitor lab results and adjust plant settings in real-time to maintain product gradation.
• Manage the plant's operating budget, tracking expenses against the annual profit plan and explaining variances.
• Review and approve purchases, manage labor costs, and identify opportunities for cost reduction without compromising safety or quality.
• Complete accurate daily production, safety, and maintenance reports using company software.
• Train and mentor hourly staff. Conduct performance evaluations and provide continuous feedback to foster professional growth.
• Maintain a positive work environment and handle employee relations issues in accordance with company policy.

Qualifications

Education

High school diploma, GED, or relevant experience

Work Experience

5+ years of experience in the Aggregates or Heavy Construction materials industry, with at least2years in a supervisory capacity, preferred.

Knowledge, Skills, and Abilities

• MSHA compliance and regulations
• Knowledgeable of aggregate processing equipment and pit design
• Knowledgeable of welding, repairs, and maintenance of mobile processing equipment
• Critical thinking
• Technical aptitude
• Business acumen
• Effective communication (written and spoken)
• Conflict resolution
• Time management
• Results driven
• Process management
• Detail oriented
• Delegation
• Quality control methods

Additional Details

Physical Requirements

Must be able to lift and carry up to 50 lbs. for plant maintenance and equipment servicing. Required to bend, stoop, climb, and reach. You must be able to maintain three points of contact when climbing on/off machinery or on ladders. Strong hand-eye-foot coordination is essential for operating hand/foot controls. You must have good depth perception with or without seeing aid for distances up to 150 feet.

Working Conditions

All duties require outside assignments and require periods of work in all weather conditions, cold, wet, dry and dusty. Must be able to work in areas where noise levels are up to 85 dbs.

Company Overview

A member of the S&P 500 Index, Martin Marietta is an American-based company and a leading supplier of heavy building materials - including aggregates, cement, ready-mixed concrete and asphalt. Through a network of operations spanning 28 states, Canada and the Bahamas, dedicated Martin Marietta teams supply the foundational resources upon which our communities thrive. Martin Marietta's Magnesia Specialties business produces high-purity magnesia and dolomitic lime products used worldwide in environmental, industrial, agricultural and specialty applications.

At Martin Marietta, we strive to work with the best and the brightest - those who have the potential to become our company's future leaders. Each of our roughly 9,500 people shares a common purpose regardless of their professional role or work environment. Together, we utilize our diverse skills and experiences to drive our company and its extraordinary culture forward. Our aim is to build on our foundation of success and help values-driven and hardworking people realize their full potential. When you decide to invest your career in Martin Marietta, you'll know what it's like to be respected, challenged and rewarded. In return, we offer a highly competitive benefits package, including:

• Medical
• Prescription Drug
• Dental
• Vision
• Health Care Reimbursement Account
• Dependent Care Reimbursement Account
• Wellness Programs
• Employee Assistance Plan
• Paid Holidays and Vacation
• 401(k) with Company matching
• Pension
• Salary Continuation - Short-Term Disability
• Long-Term Disability Options
• Employee Life Insurance
• Spouse & Dependent Life Insurance
• Business Travel Accident Insurance
• Direct Deposit Payroll
• Educational/Tuition Assistance Plan
• College Scholarship Program - for dependent children
• Matching Gift Program
• New Auto Purchase Discount Plans

Equal Opportunity Employer

At Martin Marietta, we are proud to be an Equal Opportunity Employer.

We are committed to providing an environment of mutual respect where equal employment opportunities are available to all qualified applicants and teammates.

We celebrate diversity and commit that qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, or protected veteran status and will not be discriminated against on the basis of disability.