Our scientists and engineers bring together the skills and experience necessary to understand and offer solutions for today’s environmental concerns. We make it our business to understand the ever-changing environmental regulations and how they will affect our client’s interests.

Regardless of a project’s complexity, clients can depend on our commitment to provide appropriate, innovative, and value-based solutions. From start to finish, our relationship with clients is based on integrity and responsiveness.



TTL assists many industrial clients with interpretation and compliance with the myriad of environmental regulations that affect businesses today. By keeping abreast of new regulations, TTL can alert clients of new requirements and help devise strategies for compliance. TTL is familiar with regulations relating to the Toxic Substances Control Act (TSCA), Resource Conservation and Recovery Act (RCRA), National Environmental Protection Act (NEPA), Clean Water Act (CWA), Clean Air Act (CAA), and the Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA), as well as comparable State Regulatory Programs.


In the field of air pollution control, TTL can conduct air emissions inventories for existing sources, estimate potential and expected actual emissions for new sources, determine the applicability of Federal and State Clean Air Act regulations to existing and new sources, and develop compliance and monitoring plans for applicable requirements. We can design record-keeping and reporting systems for compliance demonstrations, provide guidance for selection of air pollution control equipment, prepare appropriate permit applications (construction permit, air permit, Major Source Operating permit or “Title V” permit, PSD permit), and communicate effectively with regulatory agency air division personnel.


For over 25 years, TTL has been involved with environmental and geological explorations and response actions associated with underground storage tanks (USTs) and aboveground storage tanks (ASTs). TTL has directed or participated in exploration and corrective action services for UST and AST contamination at more than 400 sites. Our professionals stay current on remediation techniques, offering cost efficient solutions for cleaning up petroleum releases. Additionally, TTL has performed emergency response, exploratory, and corrective action services through the Federal Leaking Underground Storage Tank (LUST) program since February 1998.

Natural Resources


TTL conducts wetland delineations according to methods found in the U.S. Army Corps of Engineers Wetland Delineation Manual (1987) and the joint guidance issued June 1, 2007 by the U.S. Army Corps of Engineers and the Environmental Protection Agency. The wetland determinations are for purposes of complying with Section 404 of the Clean Water Act. Diagnostic environmental characteristics considered are hydrology, soil, and vegetation. Environmental characteristics are surveyed, data is analyzed, and areas defined with regard to Nationwide Permits and/or individual permit requirements. Wetland areas are identified for importance and quality, the severity of impact, primary and secondary function of the wetland, as well as the uniqueness and importance of the wetland function to the total wetland resources of the area.


TTL scientists are trained to locate, identify, and record the possible presence and/or absence of threatened and endangered species located within property boundaries. An inspection is conducted for appropriate species and species habitats, and for each of the individual species of concern. Species descriptions and habitat requirements are obtained from the Endangered and Threatened Species of the Southeastern United States (The Red Book), state-specific regulations, Information for Planning and Consulting (IPaC), and through coordination with the U.S. Fish and Wildlife Service.


TTL can assist federal, state, and local government agencies, as well as private sector clients, in complying with the National Environmental Policy Act and the National Historic Preservation Act. Our services include cultural resources Phase I, II, and III; identification of relevant federal, state, and local regulations; and historic structure evaluation for due diligence reports and/or tax purposes.


TTL has performed numerous water-quality and erosion studies for corridor evaluations and other construction-related projects. TTL advises industries, corporations, municipalities, and other consultants regarding surface- and groundwater supplies and treatment, wastewater treatment and discharge, and the interpretation of water-quality data. TTL’s civil professionals design and implement streamflow/water-quality sampling programs and evaluate and interpret the resultant data. These evaluations include review of data from field and laboratory measurements of dissolved oxygen, specific conductance, fecal and total coliform, nitrogen and phosphorus species relevant to predicting eutrophication in reservoirs, and related water-quality/use considerations.

Other services include Delineation, Avoidance Consulting, Permitting and Mitigation Plans for wetlands, streams, threatened and endangered species, NEPA services, bioassessments, watershed assessments, Green Site Design, and Flood/FEMA studies.

Learn more about our environmental capabilities by reaching out to Cindy House-Pearson at 205.345.0816. 


TTL performs environmental site assessments in accordance with guidelines set forth in ASTM E-1527-13 or in accordance with a Scope of Work developed for a particular client based on risk management preferences and project objectives. This practice is intended to identify the presence or potential presence of hazardous substances or petroleum products on the property that indicate an existing or past release, or a threat of a release, into structures on the property or into the ground, groundwater, or surface water on the property.


TTL is an integral player on project teams for greenfield and brownfield site developments for our clients. Our environmental group plays a vital role early in establishing avoidance criteria and identifying project concerns that may require lengthy permitting or public involvement. We have assisted in preparation of project schedules to ensure all permitting is completed to minimize avoidable project delays.


Services offered include characterization of a known or potentially contaminated site, delineation of the contaminated area by collecting soil and groundwater samples, sample analysis, and interpretation of the analytical results. TTL assists clients in evaluating potential environmental risk, researching applicable regulations, and interfacing with regulators.



TTL’s professionals are accomplished in guiding companies through the application process for NPDES (National Pollution Discharge Elimination Systems), SID (State Indirect Discharge), and UIC (Underground Injection Control) permits. TTL has prepared SPCC (Spill Prevention, Control and Countermeasures), PAP (Pollution Abatement Plan), and BMP (Best Management Practices) plans for numerous industrial sites. We have also evaluated sites for land application of sludges and wastewater.


TTL has experience in SPCC Plan preparation for a wide variety of sites, including large and small commercial and industrial facilities. Our professionals are experienced in the application of new EPA regulations regarding the development of SPCC Plans, assisting clients with plan revisions or development of new plans, and identifying ways to reduce the volume of petroleum products stored at a facility.