Quality Control Technician III

Quality Control Technician III

Company : BLUE DIAMOND

Location : Irwindale

Country : USA

Type of Contract : Regular / Permanent

Publication Date : Oct 1, 2025

Blue Diamond Materials is one of the companies that operates within Sully-Miller Contracting Co., the Colas USA subsidiary that operates throughout Southern California. We are part of Sully-Miller Companies consisting of Sully-Miller Contracting Co., Blue Diamond Materials and United Rock Products. Each company supports the other. United Rock provides the aggregate, Blue Diamond Materials provides the hot and warm mix asphalt manufacturing, and Sully-Miller Contracting executes the projects. Blue Diamond has five asphalt plants located throughout Southern California- Irwindale, Inglewood, South Gate, Sun Valley and Victorville. To learn more about Blue Diamond visitwww.bluediamondasphalt.com.

The Colas USA Family of Companies provides competitive pay, outstanding benefits, career advancement opportunities, professional education, and extensive training for every employee. We pride ourselves on upholding the highest standards of safety, environmental conservation, and ethical conduct as we strive to grow our infrastructure products and services through empowering and developing our people, fostering innovation, utilizing new technology, and maximizing vertical integration at all levels of the company’s value chain. To learn more about the Colas USA Family of Companies, please visit www.colasusa.com.

Compensation

$38 per hour

Job Summary

The Quality Control Technician 3 is responsible for sampling, testing, and reporting on construction materials—including but not limited to hot mix asphalt, aggregates, soils, and concrete—to ensure compliance with project specifications and industry standards. In addition, this role requires experience in performing specialized laboratory testing to assess material properties and ensure quality assurance. The technician will apply advanced knowledge and technical skills to support accuracy, reliability, and continuous improvement in construction material evaluation.

Main Responsibilities

Work mostly independently

May serve as a senior technician, occasionally overseeing other technicians on high-priority projects

Ensure precision and accuracy in measurements, test forms, and daily reporting

Conduct thorough inspections, identify quality issues, and implement corrective actions

Analyze test results to diagnose causes of nonconformities and recommend solutions

Apply expert knowledge of AASHTO, ASTM, and Caltrans test methods

Maintain familiarity with Green Book, FAA, Caltrans Standard Specifications, and other applicable specifications

Perform specialized testing on hot mix asphalt, aggregates, and soils, including performance tests like Hveem, Marshall, Gyratory compaction, Tensile Strength Ratios, and Hamburg Wheel

Perform aggregate property assessments, including LA Rattler and fine & coarse specific gravity tests

Perform soils testing, such as standard and modified proctors and R-values

Develop, analyze, and optimize HMA mix designs per project specifications

Maintain flexibility for overtime, including nights and weekends, as required

Perform other duties as assigned

Education and / or Work Experience Requirements

Minimum 5 years of related work experience preferred

Some college education preferred

Current Caltrans certifications in HMA and aggregates (JTCP HMA I, HMA II and Aggregate Module preferred) or equivalent certification

Valid CA Driver’s License with an excellent driving record

Skills

Ability to be precise and accurate when taking measurements and completing test forms

Ability to follow direction with excellent follow through within a timely manner

Ability to learn specific QC computer programs

Ability to lift 50 lbs. during various times of the day

Dependable self-starter with good organization skills

Good organizational and problem-solving skills

Good verbal and written communication skills

Legible handwriting

Proficient in all Microsoft Office Products

Proficient math skills

Physical Requirements

Ability to utilize hands and fingers in order to type and carry reports

Ability to stand, walk, and reach with arms and hands throughout the workday

Ability to climb, balance, stoop, kneel, and crouch

Ability to see clearly or with assistance via necessary correction

Wearing and maintaining personal protective equipment (PPE) required

Frequently exposed to all weather conditions

Frequent exposure to working around moving equipment and machinery

Frequent exposure to dust, airborne particles, etc.

Colas Inc. and its subsidiaries are an Equal Opportunity Employer. For details on the specifics of this commitment, please click here to view the EEO document () . If you are an individual with a disability and require a reasonable accommodation to :

to meet the requirements of the role in which you are applying

complete any part of the application process

access or use the online application process and need an alternative method for applying

Please contact Colas Inc. at 973-290-9082 or send an email to ColasRecruiter@colasinc.com .

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