Our team matches skilled techniques with old-fashioned common sense to provide quick response to your environmental needs

    • Phase I site assessment

    • Phase II site assessment

    • Soil and groundwater remediation

    • Spill response and cleanup

    • Hazardous materials management

    • SPCC Plans

    • Storm water management plans

    • Underground and aboveground tank removals

    • Management of regulatory issue

    • Federal, state and local government compliance

    • Indoor Air Sampling



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As professionals of engineering and science, our associates have and continue to complete numerous training course and comply with Federal, State and Local agency requirements for training and registration.It is our goal to stay on top of the advancements in technology and new requirements to meet your goals efficiently and effectively.

The licenses and certifications maintained by our professionals include the following:

• Registered Professional Environmental Engineer
• Registered Geologist
• Certified Engineering Geologist
• Civil Engineer
• Occupational Safety & Health Administration (OSHA) 40-Hour Hazardous Waste Operations (HAZWOPPER) Training
• 8-Hour HAZWOPPER Supervisor’s Training
• Four Listed Environmental Consultants, Colorado Division and Oil and Public Safety
STTI has an excellent working relationship with regulatory agencies at federal, state and local levels, and can assure compliance with the most stringent requirements.
Our engineers have developed over fifty Spill Prevention, Control and Countermeasures Plans (SPCC) for various commercial, industrial, governmental, and recreational properties across Colorado, Utah, Arizona, Nevada, and Washington. Innovative containment structures are designed to meet the specific needs of each site.
STTI has conducted over five hundred and fifty Transaction Screens and Phase I Environmental Site Assessments across commercial and industrial facilities, vacant land, residential investment, and farm and ranch properties. Phase I Environmental Site Assessments are completed in accordance with approved Standards of Practice for Phase I Environmental Assessments of Commercial Real Estate, set forth by the American Society for Testing and Materials (ASTM).
Sometimes the Phase I will identify the need for a Phase II site investigation which includes site characterization by drilling and sampling the soil and/or groundwater for contaminates. We have prepared Voluntary Clean Up Plans for property owners who needed verification from the State for site cleanup activities.