Unlimited Potential is seeking a Part-time Spanish Instructor to expand our Urban Nature Arboriculture Training Program.

About Unlimited Potential
Unlimited Potential is a community-based organization located in South Phoenix. We meet the needs of the community we serve and focus on students within those neighborhoods.

We partner with Arizona State University’s Walton Sustainability Solutions Service Urban Nature Initiative to offer a community-based trade school that provides expert instruction, field training, internship opportunities, and pathways to careers in urban forestry.

Position Summary
Under the supervision of the Director of Healthy Communities, the Instructor will provide a Spanish-preferred Arborist Training Program for upcoming cohorts.

Role and Responsibilities

• Serve as the primary teacher and mentor for a cohort of up to  10 students during a 10-week course, including labs with Bartlett Tree Experts (total of 120 hours).
• Support the integration and ongoing development of the Urban nature Arborist Training Program. 
• Collaborate with Unlimited Potential’s Adult Education team to identify curriculum improvements,  training opportunities and potential barriers for students.
• Provide ongoing guidance, mentorship, and support to cohort members.
• Work collaboratively with grant partners, community leaders, and residents to promote participation in urban forestry career pathways.

Qualifications and Education Requirements

• 2–3 years of experience in arboriculture, or a combination of education and practical arboricultural experience.
• Experience is demonstrated  through study, teaching, professional experience, and/or certification (e.g., Arizona
• Landscape Contractors Association, International Society of Arboriculture, or Association of Professional Landscape Designers).
• Spanish fluency required
• Experience in training, coaching, or mentoring within arboriculture or a related field.
• Ability to prepare, organize, and deliver instruction effectively to adult learners.
• Ability to work collaboratively across teams and demonstrate enthusiasm for supporting urban forestry initiatives.
• Strong communication, problem-solving, organizational, and time-management skills.
• Capable of working independently and managing multiple priorities.
• Availability for two morning classes and Saturday field experience days.

Additional Preferred Skills

• Experience working in multicultural environments.
• Familiarity with Google Workspace or Microsoft Office Suite (Word, Excel, PowerPoint).

Working Environment
Some activities are performed in a climate-controlled office involving extended periods of sitting, standing, or walking. Requires visual acuity and manual dexterity for daily computer use and light physical activity (lifting up to 50 pounds). Field activities may involve exposure to outdoor desert conditions, weather elements, insects, fertilizers, herbicides, and uneven terrain. Regular use of arborist equipment and tools (e.g. printers, saws, ropes and  saddles). Use of hearing protection and other Personal Protective Equipment (PPE) is required.

Supplemental Information
Start Date: January 2026 (Cohort 3 of the Arboriculture Training Program).
Hours/Location: Part-time position; approximately 120 hours over 10 weeks at G. Benjamin Brooks Non-Profit Campus.
Salary: $50 per course hour of teaching. Part-time instructors are compensated for an additional 60 minutes per instructional hour for preparation and office hours. Additional hours will be approved as needed. 
Close Date: Open until filled.
Interviews: Selected candidates will be contacted via email to schedule an interview.

Application Instructions: 
Please submit a cover letter and resume to info@unlimitedpotentialaz.org.
Questions may be directed to ttrahan@unlimitedpotentialaz.org or cgeldis@unlimitedpotentialaz.org

OPERATIONS SUPERVISOR - FORESTRY
Calling All Certified Arborists! The City of Modesto’s Forestry Division is growing — and we’re on the lookout for an experienced Operations Supervisor to help lead our amazing team! If you have a passion for trees, would love spending your time in an office setting and outdoors, and have experience supervising crews in Urban Forestry, this could be the perfect opportunity for you.

Join us in shaping a greener, healthier city — one branch at a time! 

Upcoming Salary Increases and Incentives:
3% effective 7/1/2026
2.5% Education Incentive - Bachelor's Degree
5% Education Incentive - Master's Degree

The City of Modesto is seeking a skilled leader to join our Forestry Division! The Forestry Operations Supervisor plans, organizes, directs, and oversees a variety of activities related to maintaining and repairing streets, parks, and trees, while performing technical tasks in Urban Forestry.

This role requires Arborist Certification within one year of appointment—but if you’re already a certified arborist, even better! Bring your expertise and help us keep Modesto’s urban forest thriving. 

APPLICATION PROCESS

Applicants will be assessed on the application submitted. Due to the volume of applications received, resumes will not be screened for the purpose of determining who is most qualified to compete in the testing process. It is the applicant's responsibility to fill out the "Education" and "Work Experience" sections of the application with complete information and adequate detail. Do not substitute any part of the application form with the words "see resume". The following information is provided for you to use as a reference and as a planning tool. Human Resources is unable to schedule make-up examinations.

Applicants considered to be the most qualified will be invited to continue in the testing process.

Tentative Testing Schedule
Online Exam
October 30, 2025 - November 5, 2025

Human Resources reserves the right to revise the testing process to best meet the needs of the City. We are an equal opportunity employer. We are committed to fostering, cultivating and preserving a culture of diversity, equity and inclusion.

MINIMUM QUALIFICATIONS:
Experience and Training Guidelines:  
Any combination of experience and training that would likely provide the required knowledge and abilities is qualifying.  A typical way to obtain the knowledge and abilities would be:

Experience:  
Three years of increasingly responsible experience performing construction and maintenance work in the assigned area of responsibility, including one year providing technical and functional supervision over assigned personnel

Training:
Equivalent to an Associate’s degree from an accredited college with major course work in business administration, public administration, or a related field. 

License or Certificate:
Possession of, or the ability to obtain, a valid California driver's license.  

Click Here to apply or for more information

Tree Worker/Arborist
The Presidio Trust is seeking a Tree Worker/Arborist who will support the Forestry Department. This is a journey level Tree Worker/Arborist position. The Presidio Trust is an innovative federal agency that stewards and shares the history, beauty, and wonder of the Presidio for everyone to enjoy forever. The ancestral homeland of the Ramaytush Ohlone, the Presidio was once a military post under three flags. Today, it is a surprising national park site spanning 1,500 acres at the Golden Gate. Its rare natural habits, inspiring views, and world-class trails are a local and global attraction. It is among the most biologically diverse parks in America and a popular destination with beaches, museums, restaurants, hotels, homes, and offices.

Reporting to the Tree Worker/Arborist Supervisor, the Tree Worker/Arborist performs routine and skilled duties involved in the maintenance, planting, pruning and removal of trees and other vegetation under the technical guidance and supervision of the Tree Worker III in Charge and Forester/Supervisor.

This is a full-time position with benefits and a starting at $56.59 per hour, based in the San Francisco Bay Area. This position is included in a bargaining unit, specifically the Laborers' International Union of North America, Local 792, United Public Employees of California. Applications received by November 4, 2025, will receive first consideration.

Click Here to Apply

Responsibilities

• Fells trees, clears land and prepares soil, plants, stakes and mulches with preparation, installation and maintenance for the establishment of new trees in reforestation sites
• Prunes or removes trees and stumps using chain saws, handsaws, pole saws, pole pruners, stump grinders, wheel loaders, track loaders and various other tools and equipment
• Climbs trees with ropes and harness both with and without the use of climbing gaffs and/or works from an aerial lift to remove dead, dying, diseased, damaged and hazardous limbs or trees
• Cuts, stacks, hauls, loads and chips brush, logs, stumps and other debris utilizing chipper, front end loader, trucks, trailers and other tools and equipment
• Drives vehicles requiring a Class B driver's license hauling forestry equipment materials and supplies
• Safely and proficiently applies the proper use of rigging for the removal of limbs and heavy wood utilizing slings, ropes, blocks, knots, lowering devices and other hardware and equipment
• Performs routine maintenance and repairs on tools and equipment and maintain the shop and work areas in a clean, orderly, and safe condition
• Monitors self and crew and public safety; verifies proper use of traffic control devices, sets out cones, barriers and warning signs and utilizes safe work practices for tree work as set out in both ANSI and OSHA standards
• Responds to tree related emergency calls occasionally after hours and or weekends
• Works with Volunteers on Forestry sponsored events
• Cuts grass and tall weeds by use of string trimmers, brush cutters and high weed mowers
• Responds as appropriate to questions from public, residents, tenants and Presidio staff using principles of good customer service; reports any problems or issues to the Forester
• Other duties as assigned

Required Qualifications

• High School diploma or general education degree (GED)
• At least 5 years verifiable tree climbing experience as a qualified arborist as defined by ANSI Z133 (2107)
• Valid State of California Driver's License Class B or higher (Class A within 6 months)
• Ability to operate a variety of tree maintenance equipment and tools such as chain saws, block and tackle, chippers, stump grinders, aerial lifts
• Knowledge of ropes, knots, rigging and hitches and climbing trees to a height of 100 feet or more
• Knowledge of the qualities and characteristics of most trees found in the Presidio
• Advanced knowledge of tree pruning and removal in accordance with ISA pruning standards and BMP's
• Ability to work safely in compliance with ANSI and OSHA standards and established safety practices including aerial rescue
• Ability to establish and maintain positive working relationships with co-workers and other Trust employees
• International Society of Arboriculture (ISA) Certified Tree Worker Certification or Qualified Arborist as defined in ANSI Z133 (2017)
• Qualified Incidental Line Clearance Certification or possession of comparable education, training, and on-the-job-experience as defined in ASNI Z133 (2017) Section 4.2.4 (within first year)
• Proficient operation of heavy equipment including front end loader, skid steer, stump grinder, aerial lifts, and others as directed

Desired Qualifications

• A passion for the mission and values of the Presidio Trust.
• ISA Certified Arborist
• Verifiable Aerial Lift Certification
• Verifiable experience working with and around cranes for tree removal
• Utility Arborist Certification
• Municipal Arborist Certification
• Board Certified Master Arborist Certification
• TRAQ Certified

Skill & Knowledge

• Advanced knowledge of tree anatomy and biology to identify and treat tree diseases
• Advanced knowledge of soil and the relationship between tree root systems and soils they grow in, to manage tree health and performance; water requirements of trees, irrigation methods, water conservation practices, and drainage tree nutrition and fertilization essential for tree growth and development; insects, diseases, biotic and abiotic disorders associated with trees; tree identification to properly diagnosis tree related problems (e.g. diseases, pests, etc.) and make treatment recommendations;
• Advanced knowledge of personal protective equipment (PPE) requirements, care, use, inspection, and replacement
• Advanced knowledge of construction preservation of trees including site protection, pre-construction/post-construction mitigation, etc.
• Advanced knowledge of arborist equipment including ropes and their tensile strengths, attachment hardware and their working load limits, etc.
• Advanced knowledge of climbing and rigging knots and their applications; rigging (i.e. vectors, force), equipment (i.e. ropes, slings, blocks), methods (i.e. establish rigging point, control friction) and techniques (i.e. rigging point above)
• Advanced knowledge of proper planting techniques and establishment procedures; tree climbing skills using a rope and work positioning saddle, climbing gaffs (spikes), etc.
• Advanced knowledge of chainsaw safety, maintenance, and operation; rigging techniques and methods
• Advanced knowledge of proper pruning techniques; tree support system components, design, and function; lightning protection system components, design, and function.
• Advanced knowledge and ability to teach and instruct others about tree components and their functions
• Advanced ability to ensure team compliance with OSHA 1910, General Industry Regulations and ANSI Z133.1
• Safety Standards for Arboricultural Operations; perform compound rigging techniques to execute advanced limb removal, heavy wood removal, and top removal to dismantle trees; perform and review condition assessment of trees.
• Equipment operation skills including aerial lift, bucket truck, woodchipper, stump grinder, skid steer, etc., as identified under optional functions.

Physical Effort

• Ability to work at heights up to more than 100 feet.
• Regularly lift and/or move up to 50 pounds, frequently lift and/or move up to 75 pounds, and occasionally lift and/or move up to more than 75 pounds.
• Long periods of physical exertion.
• Prolonged exposure to repetitive motion.
• When motor vehicle or tractor operator duties are performed, moderate effort is exerted to manipulate equipment controls.

Working Conditions

• This type of work is inherently dangerous and may result in serious injury from slips, trips, or falls and could, in the unlikely event, result in death when performed incorrectly.
• This work is performed outside and is subject to weather conditions ranging from high heat and humidity to sub-zero temperatures.
• Possible exposure to a variety of site hazards including extreme environmental conditions; poisonous plants, insects, and/or reptiles; electrical conductors; uneven terrain; pedestrian/vehicular traffic, etc.
• Possible prolonged exposure to noise more than 85 decibels (db) when working with or near chainsaws, woodchippers, etc. Will be required to wear protective clothing; as well as normal safety items such as boots, glasses, etc. When vehicles are operated there is additional exposure to risk due to traffic accidents, overturning or boom accidents aloft.

Background Check
This position is subject to an employment background check which shall consist of a review of applicable county, state and Federal criminal and civil records, state bankruptcy indexes, driver’s license, education, and employment history. An individual’s granting of a background check and resulting report is voluntary. However, employment is contingent upon the successful completion of an employment background check. The Presidio Trust may refuse to hire an individual, may rescind an offer of employment to an individual, or may review and terminate the employment of a current employee not successfully completing the background check.

The Presidio Trust is an equal opportunity employer, offering a competitive benefits package. To learn more, visit www.presidio.gov/about/presidio-trust/careers.

Click Here to Apply