Trillith Compressor Station - Featured Project - 730 x 400

 Trillith Compressor Station During Construction

  • Trillith Compressor Station - Featured Project - 730 x 400
  • Trillith Compressor Station - Featured Project - 730 x 400
  • Trillith Compressor Station - Featured Project - 730 x 400
  • Trillith Compressor Station - Featured Project - 730 x 400

Trillith Compressor Station

Located in Butler County, Pennsylvania, the 10 acre Trillith Compressor Station site required more than 91 ,000 cubic yards of material to be moved and 25,000 plus tons of gravel to be laid. As one of the most important components of the natural gas transportation system, this compressor station will scrub, compress, and cool the natural gas that will flow through pipelines for the next 40 to 70 miles.


Gateway Engineers initial involvement with the development of the Trillith Compressor Station arose with the need to validate an existing environmental report. During the validation process, our environmental professionals determined that a stated wetland feature was, in actuality, nonexistent. Prior to the conclusion of the report, portions of the site could not be developed due to local regulations. Following the conclusion of the report, we leveraged regional and local relationships to expedite the necessary regulatory processes to keep the project on schedule and within the confines of the client’s budget. Once the navigation of regulatory processes was completed, our project team was retained to provide the client with construction administration, geotechnical, environmental, site design, permitting, traffic, and structural services throughout the design and construction phases of the project.


During the design phase, utility research uncovered an existing two-inch Dominion gas line that crossed the site. Working closely with Dominion and MarkWest, our team worked to identify a desirable reroute location for the line while providing financial impact reports to aid in the decision making process. After the proposed route and associated costs were approved, all necessary filing was completed such that it did not delay the construction schedule. Seamless coordination between all parties ensured the completion of the reroute before the construction phase began. Additionally, as the design was finalized, we discovered the need to engage the land department to ensure the property owner was aware of certain design constraints. Due to these constraints, it was necessary to obtain easement for stormwater runoff from another property owner neighboring the site. A meeting was scheduled with the neighboring property owner where we presented the owner with the overall design which ultimately lead to obtaining the necessary sign-offs to enable permitting of the development. The regulatory (DEP and local Township) permitting process advanced quickly and well ahead of the required start of construction.


After the design phase was completed, we then provided full-time inspection of the site's geotechnical work while making recommendations to MarkWest on how to streamline construction. Our survey and design professionals assisted in redesigning options for multiple portions of the site during this phase which helped maximize efficiency and reduce costs associated with stormwater and topsoil disposal.

Our professionals were thoroughly involved throughout the process of developing the Trillith Compressor Station site. What began as a validation of existing environmental reports quickly developed into site design, utility research, construction administration, and full-time geotechnical inspection of the site.