JOB SUMMARY: The full performance grade of positions filled is GS-05, GS-06, OR GS-07. Positions filled will be full-time; or full-time seasonal with 13 pay periods of guaranteed pay status and 13 pay periods of nonpay time, or 18 pay periods of guaranteed pay status and 8 pay periods of nonpay time. Applications will expire every 90 days. To remain active for consideration, applicants must resubmit their application. See Additional Information section for more information. MAJOR DUTIES: May service as leader of a crew consisting of three or more employees. IMPORTANT: Click the 'Apply for this job' button to view a complete job description.