TTL Associates, Inc., was established in 2003 under the leadership of Thomas R. Uhler, P.E., President and developed TTL as a ... premier, full-service environmental, testing, and geotechnical engineering firm with "in-house" certified laboratories and drilling services. Originally founded in 1927 as Toledo Testing Laboratory, the 82 year history brings clients experience and expertise in environmental issues, quality testing of construction materials, and geotechnical investigations needed in today's world. Locations: Toledo, OH (Corporate Office) - Plymouth, MI - Washington, D.C. read more