PaleoWest Acquires Stratified Environmental and Archaeological Services (SEAS)

The Riverside Company Invests in PaleoWest

February 15, 2022

Professional Services

The Riverside Company has made a platform investment in PaleoWest, a Phoenix-based cultural resource management (CRM) consultancy that provides archaeology, historic architecture and paleontology services in support of land development and infrastructure projects. Riverside said the investment will help PaleoWest expand its technology, service lines and geographies and pursue add-on acquisitions to drive growth.

Contract Land Staff (CLS) Acquires Southeastern Archaeological Research (SEARCH) from SEARCH Inc.

September 19, 2024

Environmental Services

Contract Land Staff (CLS), a portfolio company of Sentinel Capital Partners, has acquired Southeastern Archaeological Research, Inc. (SEARCH), a leading cultural resource management and archaeology firm. The acquisition is an add-on to CLS to expand its archaeological and cultural resource management capabilities; financial terms were not disclosed.

MES Life Safety Acquires SeaWestern Inc.

November 25, 2025

Industrial Services

MES Life Safety, a PE-backed national provider of fire, safety, and emergency response solutions, has acquired SeaWestern Inc., a Kirkland, Washington-based supplier of firefighting and safety equipment. The deal — supported by MES sponsor Platte River Equity — expands MES's presence and capabilities across the Western United States and adds regional relationships, equipment distribution, and service capabilities to the MES platform.

Superior Environmental Solutions Acquires Arrowhead Environmental Services

May 20, 2024

Environmental Services

Superior Environmental Solutions (SES), a portfolio company of Palladium Equity Partners, has acquired Arrowhead Environmental Services, a Windsor, Virginia-based provider of environmental and industrial services. The add-on expands SES's geographic reach into the Southern Mid-Atlantic (Central Virginia), brings approximately 50 employees and 75 customers into the SES platform, and underscores Palladium's strategy of growing SES via tuck-in acquisitions; financial terms were not disclosed.

The Riverside Company / PaleoWest Acquire Commonwealth Heritage Group as Add-on

September 26, 2022

Professional Services

The Riverside Company has added Commonwealth Heritage Group, Inc. (CHG), a Michigan-based cultural resource management firm, as an add-on to its PaleoWest platform. The acquisition expands PaleoWest’s geographic footprint and service capabilities—adding maritime/underwater archaeology—and creates a coast-to-coast cultural resources platform to better serve public- and private-sector clients on infrastructure and land-development projects.

Trinity Consultants Acquires SESPE Consulting

January 13, 2021

Environmental Services

Trinity Consultants, a portfolio company of Levine Leichtman Capital Partners, has acquired SESPE Consulting, an environmental, engineering, and planning firm headquartered in Ventura, California. The acquisition expands Trinity's regulatory-driven environmental and land use planning capabilities and establishes new operational locations on the West Coast (Ventura, San Diego) and in Oregon; SESPE founders will remain in leadership roles.