Creative Solutions to Community Challenges.

Phase I Environmental Site Assessments 

TGC performs Phase I Environmental Site Assessments (ESA) for both individual parcel sites and multi-mile corridors in urban and rural areas. TGC is in the unique position of providing ESAs at the inception of a project; we often go on to obtain federal or state funding, complete the Categorical Exclusion or similar environmental clearance, and manage the project until and after completion. This provides a clear perspective on a project from the very early stages, and a wholistic big-picture view when performing the ESA that is often lacking.

The general objective of an ESA is to provide protection from liability when acquiring real estate and support an Innocent Landowner Defense if contamination is present. An ESA reviews available data regarding a subject property/corridor and provides an opinion regarding the presence or absence of potential environmental impacts from current or past uses of the site. A Phase I ESA is conducted based on the American Society for Testing and Materials (ASTM) Standards E1527-13 and E2247-16 (rural) and 40 CFR Part 312 Standards andPractices for All Appropriate Inquiries (AAI). For projects in the City of Houston, additional specifications from the Department of Public Works and Engineering Infrastructure Design Manual“Phase I Environmental Site Assessment (ESA I) Requirements” must be followed.  READ MORE



Categorical Exclusions 

TGC has a long history of completing successful Categorical Exclusions (CE) for both the Federal Transit Administration (FTA) and Federal Highway Administration (FHWA) for roadway, sidewalk, park and ride, and administration facilities.

CEs are approved for projects under the National Environmental Policy Act (NEPA) that do not individually or cumulatively have significant impacts. FTA and FHWA have CE categories designated as the “c-list”under 23 CFR Part 771.117(c). These types of projects are common and known through experience to not have significant adverse impacts. An example of a c-list project is a bicycle and pedestrian facility. There are also “d-list” CEs, which are still anticipated to not have adverse impacts, but must provide more documentation to support this finding. D-list projects include bridge replacements and highway modernizations. The d-list includes an “open-ended” CE for projects that do not necessarily meet any of the established c- or d-list categories but are not expected to have adverse impacts. 


Other Environmental Assessments

TGC created and has completed numerous Preliminary National Environmental Policy Act (NEPA) Review documents for clients preparing submittals for discretionary grant opportunities. These documents provide information on existing conditions and a review of planned improvements through the lens of gaining NEPA approval. For relevant impact categories, background on NEPA and state and federal regulations is provided, as well as potential impacts or the anticipated need for additional analysis or agency coordination. The Preliminary NEPA Review is key for ranking projects and identifying “red flags” that may impact cost and timeline for completion.