Water and Environmental Consulting and Engineering


Core Values

  1. Develop and promote a Safety Culture that provides our employees with a safe place to work, while encouraging others to work safe.

  2. Provide our employees the tools and opportunities to achieve an enriching work experience.

  3. Provide our employees a flexible workplace and empower them to attain their full potential.

  4. Design quality into our deliverables and show our clients that we have pride and ownership in all that we provide them.

  5. Protect our environment by incorporating sustainability, energy conservation and waste management into our project designs and thought processes.

  6. Go above and beyond in all work products.

  7. Give back to the Community whenever possible through volunteerism.

  8. Be honest, forthright, and ethical in all endeavors.

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Theresa Jehn-Dellaport


Founder and Principal

Theresa brings over 30 years of experience in water and environmental consulting to Quantum. As President of Quantum, she uses her extensive experience leading large multidisciplinary technical staff, subcontractors, and consultants to develop a high quality comprehensive strategy that meets the needs of clientele. Theresa regularly provides expert testimony in Colorado Water Court Cases and has provided expert witness services on behalf of the State.  She has served as President on the Colorado Board of Examiners of Water Well Construction and Pump Installation Contractors.

John Dellaport


Environmental Division Manager

John is a Professional Engineer licensed in Colorado, Wyoming, and Utah and a registered professional geologist in several states. He has over 35 years of experience in environmental consulting and has managed assessments and remediation of many complex sites throughout the U.S. As Environmental Division Manager for Quantum, he mentors staff on the development and execution of environmental projects and manages environmental cleanup and landfill closure projects valued at over $5M. 

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Senior Consultant

John is an earth scientist and hydrologist providing comprehensive services in all aspects of interactions among water, the geologic environment, and naturally-occurring and anthropogenic geochemistry of aqueous systems. He has developed, applied, and promoted innovative techniques and approaches to ensure that the nature and extent of the issues on a particular project are clearly understood and defined.

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Geographic Information Systems Manager

Mr. Dellaport is responsible for thematic cartography, reference mapping, and 3D geographic animations leveraged through ESRI's ArcGIS Suite©. Mr. Dellaport is an expert in graphic design applications and specializes in using the Adobe Creative Cloud Suite© to produce compelling print and electronic media that depicts topics of a highly technical and scientific nature. Through the integration of the ArcGIS Suite© and the Adobe Creative Cloud Suite©, Mr. Dellaport is among the vanguard of the fusion of digital graphic design and cartography.

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Project Manager

Logan is an environmental engineer-in-training with a background in mathematics. He provides engineering support in the collection of environmental samples from groundwater monitoring wells and soil vapor wells. As a Project Manager, Logan also supports water rights engineering projects including accounting, analyses of stream depletions for augmentation plans and support for Water Court applications. Logan is also adapt in AutoCAD® and is currently Quantum's lead CAD drafter.

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Rachina Randolph

Business Manager

Rachina is Quantum’s Business Manager and brings over 15 years experience performing accounting and job costing functions. Rachina provides administrative assistance to quantum staff. Rachina is in charge of accounting, payroll, and the managerial aspects of Quantum.