Test and analyze geological samples, crude oil, or petroleum products to detect presence of petroleum, gas, or mineral deposits indicating potential for exploration and production, or to determine physical and chemical properties to ensure that products meet quality standards.

Education: Most occupations in this zone require training in vocational schools, related on-the-job experience, or a diploma.

Expereince: Previous work-related skill, knowledge, or experience is required for these occupations. For example, an electrician must have completed three or four years of apprenticeship or several years of vocational training, and often must have passed a licensing exam, in order to perform the job.

Training: Employees in these occupations usually need one or two years of training involving both on-the-job experience and informal training with experienced workers. A recognized apprenticeship program may be associated with these occupations.

• Laboratory Technician, Quality Control Technician (QC Technician), Materials Technician, Core Inspector, Electron Microprobe Operator, Environmental Field Services Technician, Environmental Sampling Technician, Geological Sample Tester, Mud Logger