Nordic Calista On-Call JOB SUMMARY: This is a skill level position in the petroleum industry. The position has a multitude of responsibilities above the drilling floor. Must be able to maintain drilling fluid integrity and adjust chemicals according to drilling program needs. Follows established equipment preventative maintenance program to ensure equipment readiness and safe operating procedures. This position is expected to support the Winter Exploration 2026–2027 season, with an anticipated start date of October 2026 and an end date in April 2027. ESSENTIAL FUNCTIONS: The Derrickman works off the racking platform in the derrick during the tripping of drill pipe and collars. They may be latching or unlatching elevators from pipe, racking or unracking sequentially in the fingers. Conditions the drilling fluid and maintains mud pumps (i.e., tests for weight and viscosity), adds chemicals to drilling mud following specific mud engineer or driller’s directive. Ensures preventive maintenance is performed on all equipment above the rig floor and equipment associated with the drilling fluid system. Inspects to see that all equipment including degasser in mud tanks is installed properly and greased as required. Performs preventive maintenance on mixing hopper, desanders, desilter, high- and low-pressure hoses, and related drilling fluids equipment. During casing operations Derrickman may be required to work in derrick on stabbing board or work the catwalk. Ensures the proper set up and installation of the escape buggy system. This includes the proper maintenance and inspection of the buggy, the escape line and the securing pin. Relief Driller. Pit watcher, if not separately staffed. Performs any other duties that may be assigned. KNOWLEDGE, SKILLS, & ABILITIES: Conducts his job duties in compliance with Nordic HSET/HSE policies. Works toward achieving Nordic’s annual HSET goals. Assists Rig Management in identifying operational non-conformances at the rigsite. Reports any spills on pad to Rig Manager’s office immediately– including oil, water, glycol, drilling mud, dry mud products, etc. Notifies Rig Manager of any environmental non-compliances immediately. Reports any property or environmental damage by third-party vendors to Rig Manager’s office immediately. Encourages rig personnel to report any unsafe work conditions or practices and any environmental non-compliances immediately to supervisors. Assists in development and implementation of standard operating procedures. Keeps timely and accurate motor reports, noting any spills or releases. Assists in maintaining waste management tracking system and hazardous waste determinations. Assists in completing daily spill champion activities log. Assists in any internal audits as necessary. Assists Driller in daily rig site duties. MINIMUM QUALIFICATIONS: High School Diploma or equivalent Ability to obtain or currently hold North Slope Training Cooperative card. Must have a minimum of one year’s experience on a diesel electric rotary drilling rig. Must be able to operate hopper ad viscosity testing equipment. Must possess a current Well Control Certificate at the Drilling Supervisor level. Must be functionally literate, able to read, write, and perform basic math. Familiarity with oilfield-related equipment and procedures preferred. WORKING ENVIRONMENT: Inside enclosed oil rig – may be on racking platform 90’ above rig floor or 120’ to 150’ above ground. Exposed to intense arctic temperatures for short periods. Wet, oily steel floor. PHYSICAL/VISUAL/MENTAL/ENVIROMENTAL DEMANDS: The demands described here are representative of those that must be met by an employee to successfully perform the essential functions of this job. PHYSICAL EFFORT: The employee must complete a pre-employment drug screen and physical function assessment. The work requires walking, standard, bending and carrying items weighing up to 50 pounds without assistance. The ability to withstand working at heights for prolonged periods of time is a requirement. VISUAL ACUITY: Frequently: Distance vision (clear at 20' or more), Color vision (ability to identify and distinguish colors), Peripheral vision (ability to observe an area that can be seen up and down or to the left and right while eyes are fixed on a given point), Ability to adjust focus (ability to adjust the eye to bring an object into sharp focus). Continuously: Close vision (clear at 20" or less), Depth perception (three-dimensional vision, ability to judge distances and special relationships). MENTAL EFFORT: Frequently: Discriminating colors. Continuously: Thinking analytically, Using effective verbal & written communication, Handling stress & emotions, Concentrating on tasks, Remembering details, Making decisions, Adjusting to changes, Examining/observing details. ENVIRONMENTAL FACTORS: Frequently: Working w/others, working alone. PREFERENCE STATEMENT Preference will be given to Calista shareholders and their descendants and to spouses of Calista shareholders, and to shareholders of other corporations created pursuant to the Alaska Native Claims Settlement Act, in accordance with Title 43 U.S. Code 1626(g). EEO STATEMENT Additionally, it is our policy to select, place, train and promote the most qualified individuals based upon relevant factors such as work quality, attitude and experience, so as to provide equal employment opportunity for all employees in compliance with applicable local, state and federal laws and without regard to non-work related factors such as race, color, religion/creed, sex, national origin, age, disability, marital status, veteran status, pregnancy, sexual orientation, gender identity, citizenship, genetic information, or other protected status. When applicable, our policy of non-discrimination applies to all terms and conditions of employment, including but not limited to, recruiting, hiring, training, transfer, promotion, placement, layoff, compensation, termination, reduction in force and benefits. REASONABLE ACCOMMODATION It is Calista and Subsidiaries' business philosophy and practice to provide reasonable accommodations, according to applicable state and federal laws, to all qualified individuals with physical or mental disabilities. The statements contained in this job description are intended to describe the general content and requirements for performance of this job. It is not intended to be an exhaustive list of all job duties, responsibilities, and requirements. This job description is not an employment agreement or contract. Management has the exclusive right to alter the scope of work within the framework of this job description at any time without prior notice. OUR VISION A world class corporation exemplifying cultural values, servant leadership and economic prosperity. OUR MISSION Improve the economic and social well-being of our Shareholders and communities through growth, leadership, collaboration and financial discipline. About Calista Corporation Headquartered in Anchorage, Alaska, Calista Corporation is the second-largest of Alaska's 12 Native Regional Corporations. With over 38,000 shareholders, we are proud to be the parent company of more than 30 subsidiaries across four major holding companies. Our diverse business portfolio spans federal contracting, construction, real estate, environmental services, natural resource development, marine transportation, oil field services, and heavy equipment sales, service, and rentals. Our footprint extends across the Calista Region, an expansive area in southwestern Alaska, covering 57,000 square miles. The region is home to 48 permanent and 8 seasonally occupied villages along the Bering Sea coast and two of Alaska’s mighty rivers, the Yukon and Kuskokwim. For over a decade, we have consistently ranked in the top 10 of Alaska Business Monthly’s “Top 49 Alaskan-Owned and Alaska-Operated Companies” by gross revenue. As we continue to grow, we are looking for motivated individuals who are passionate about making a difference in our communities and contributing to our ongoing success.

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