About TTL Associates

About TTL Associates

Established in 1927 as Toledo Testing Laboratory, TTL Associates, Inc. has grown to be a full-service environmental, geotechnical engineering, industrial hygiene, materials testing and drilling firm. TTL serves local, regional, and federal clients across the country from our headquarters in Toledo, Ohio and branch offices located in Cleveland, Ohio; Plymouth, Michigan; and Washington, DC.

Established under the leadership of Retired Lt. Col. Thomas R. Uhler, P.E., CEO, TTL is recognized as a verified Service Disabled Veteran Owned Small Business (SDVOSB). Robert S. Ruse, Ph.D., P.E., serves as TTL’s President. In addition, TTL is an “Encouraging Diversity, Growth and Equity” (EDGE) certified firm with the State of Ohio and is recognized as a veteran friendly business.

We have adopted a “Zero Accidents” goal. We believe that every accident is preventable and ask all associates to share the responsibility for reducing personal injury, automobile, and equipment incidents to zero.


  • Commercial – Development/Redevelopment
  • Education
  • Energy
  • Healthcare
  • Federal Government
  • Local/State Government
  • Industrial
  • Retail
  • Transportation


  • U.S. Department of Veterans Affairs (VA) “Enterprising Veteran Award”
  • Small Business Administration (SBA) “Veteran Small Business Champion” (Cleveland District)
  • Employer Support for the Guard and Reserve (ESGR) “Seven Seals Award”
  • ESGR “Patriotic Employer Award”
  • NASA Program Manager’s Commendation
  • NASA Space Flight Awareness Team


  • TTL’s EMR # 0.47
  • TTL incorporates safety into all aspects of our operations to minimize risk to our workers, subcontractors, the public and the environment. We have 8 years experience implementing our DoD-proven Health & Safety (H&S) program on over 20 various DoD projects, completing all work with no lost time incidents. Our commitment to safety is evidenced by the fact that we have over 200,000 hours of work without a lost time incident.

TTL Accreditations & Affiliations

  • American Association of Laboratory Accreditation (A2LA)
  • American Association of State Highway & Transportation Officials (AASHTO)
  • American Concrete Institute (ACI)
  • American Consulting Engineers Council (ACEC)
  • American Council of Governmental Industrial Hygienists (ACGIH)
  • American Council of Independent Laboratories (ACIL)
  • American Industrial Hygiene Association (AIHA)
  • American Institute of Professional Geologists (AIPG)
  • American Society of Civil Engineers (ASCE)
  • American Society of Highway Engineers (ASHE)
  • American Society of Safety Engineers (ASSE)
  • American Society of Testing and Materials (ASTM)
  • Associated General Contractors (AGC)
  • International Council of Shopping Centers (ICSC)
  • International Facility Management Association (IFMA)
  • Michigan Association of Environmental Professionals (MAEP)
  • Michigan Society of Professional Engineers (MSPE)
  • National Brownfield Association (NBA)
  • Ohio Roofing Contractors Association (ORCA)
  • U.S. Army Corps of Engineers Validated (USACOE)
  • US Green Building Council (USGBC)
  • Washington Metropolitan Area Construction Safety Association (WMACSA)