Plant Manager I

Martin Marietta; Concord (CA); On-site; USD 120,000 - 180,000; Full time

Job summary

Martin Marietta seeks a Plant Manager to lead a quarry or sand and gravel operation in California. You will drive safety culture, oversee production, and ensure product quality while controlling costs and optimizing efficiency.

This role requires strong leadership, budgeting, and regulatory compliance within a dynamic mining environment. You will manage maintenance, coordinate with quality control, and mentor hourly staff to sustain peak plant performance and safe operations.

Qualifications

• MSHA compliance and regulations knowledge.
• Experience with aggregate processing equipment and pit design.
• Welding, repairs and maintenance of mobile processing equipment.
• Strong communication and leadership abilities.
• Proven ability to manage budgets and control costs.

Responsibilities

• Champion safety culture and ensure MSHA and company safety regulations are followed.
• Maintain environmental compliance with air quality, water discharge, and reclamation permits.
• Lead site inspections and ensure equipment is safe and reliable.
• Oversee production: stripping, drilling, blasting, hauling, crushing, screening, stockpiling.
• Monitor KPIs (TPH, downtime, yield) and drive process improvements.
• Manage raw materials and finished goods inventories to meet demand.
• Develop and oversee a PM program to minimize downtime and extend asset life.
• Plan maintenance shutdowns with internal teams and vendors.
• Coordinate with Quality Control to meet ASTM, DOT and customer specs.
• Review costs, manage labor, and pursue cost-reduction opportunities.
• Prepare accurate daily production, safety, and maintenance reports.
• Train and mentor hourly staff and provide ongoing feedback.
• Maintain positive work environment and handle employee relations per policy.

Skills

MSHA compliance

Safety culture

Budgeting

Process optimization

Leadership

Communication

Conflict resolution

Time management

Detail oriented

Quality control

Delegation

Training

Business acumen

Education

High school diploma or GED

Job description

JOB SUMMARY

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 least 2 years 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.