Pinnacle Engineering is a recognized national leader in environmental services; our professionals have been dedicated to environmental engineering for over 25 years. We customize solutions to fit our clients' needs. An experienced advisor, Pinnacle understands the broad spectrum of challenges that clients face. Our creative and dynamic professional engineers, geologists, hydrologists, and scientists guide our clients through both large and small environmental problems.

We work closely with our clients to fully understand their specific business challenges and goals as we design and implement innovative and cost effective solutions. Our experts have decades of experience with all aspects of environmental issues ranging from complex investigative, permitting and remediation strategies, to routine Phase I site investigations. We are experienced in the assessment and remediation of the full suite of environmental contaminants.

Pinnacle provides effective solutions for environmentally impacted properties. From an unmatched knowledge of regulatory procedures to long term relationships with key local, state and federal regulators, Pinnacle has a unique depth of proficiency. Our clients turn to us to manage the complex regulatory climate and achieve their permitting and remedial action objectives within schedule and budget. At Pinnacle, we are successful when our clients are successful.


Pinnacle Engineering provides integrated offerings that are designed to serve the needs of our clientele.  We offer an array of environmental investigation based services such as:

Environmental Review

  • Expert Witness & Testimony

  • Client Negotiations

  • Environmental Assessment Worksheet (EAW)

  • Environmental ImpactStatement (EIS)

  • Alternative Urban Area-wide Review (AUAR)

  • Tiered NEPA Review

  • Cultural Resource Management

  • Fatal Flaw Analysis

  • Environmental Forensics

  • Mining Studies & Feasibility Assessments

Environmental Site Investigations

  • Ecological Risk Assessment,

  • Third Party & Due Diligence Reviews

  • Remedial Investigation\Feasibility Studies

  • Superfund, RCRA, and Environmental Permitting

  • VIC and PBP Program Implementation

  • Phase I and II Environmental Site Assessments

  • UIC Permitting & Injection Well Installation & Design

  • Assessment & Remediation of Environmental Contaminants: Metals, Chlorinated Organic Chemicals, & Petroleum Hydrocarbons

  • Aviation & Biofuels, Emerging Contaminants, etc.

Brownfield Redevelopment

  • Site Investigation/Remediation

  • Liability Protection

  • Public Review/Reimbursement Programs

  • Site Planning

  • Engineering and Design Development

  • Environmental Permitting & Grant Writing

Environmental Engineering

  • Environmental and Emergency Response

  • Regulatory Representation

  • RS (Aquifer Recharge & Storage) & Water Supply Projects

  • Hydrology/Groundwater Engineering

  • In-Situ Bio-Remediation & Construction Management

Permitting, Documentation, and Reporting

  • Asbestos Surveys

  • Wetland and Mitigation Studies

  • Tank Identification/Removal/Closure

  • Well Closure Monitoring


Projects may involve a combination of services working together to accomplish the project goals. 
Explore our related capabilities such as:

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Specific project examples can be found on our Environmental Projects page:


If you're in need of assistance with a project, or would like to know more about our services, please contact:

Scott Thelen
Office: 763.277.8410   Cell: 612.432.5590

Keith Rapp, PG
Office: 763.277.8422   Cell: 612.382.3763

Jeff Melby, PE
Office: 763.277.8402 Cell: 612.803.1779