Apex Companies is seeking a dynamic and experienced Senior Technical Project Manager (PM) to join our growing team in Pleasant Hill, CA. This key leadership position will drive the successful delivery of complex environmental investigation, remediation, and compliance projects involving soil, groundwater, sediment, soil vapor, surface water, and other environmental media. The role requires strong technical leadership, exceptional client management skills, and a proven ability to mentor staff, manage project execution, and support business growth. Experience with industrial, manufacturing, petroleum, government, and brownfield remediation programs is highly desirable.