Terraphase Engineering Inc.

Terraphase Engineering Inc.

Terraphase Engineering Inc.

Terraphase is an environmental consulting company that offers cost-effective solutions to complex environmental and engineering challenges. We apply technical expertise and keen awareness of the regulatory framework to achieve our clients` project goals and objectives. The combined talent and experience of Terraphase`s engineers, geologists, and scientists form the foundation for a comprehensive environmental management approach. Terraphase offers a wide range of environmental and geotechnical engineering services, including: - site investigations - environmental assessments - soil & groundwater remediation - geotechnical engineering - storm water management - brownfield redevelopment - wastewater & groundwater treatment systems - wetland permitting & mitigation design - litigation support - construction claims - regulatory compliance Terraphase has offices in Oakland and Sacramento, California

Company details

1404 Franklin St., Suite 600 , Oakland , Ca 94612 USA
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Business Type:
Engineering service provider
Industry Type:
Soil and Groundwater Consulting and Engineering
Market Focus:
Regionally (various states or provinces)
Year Founded:
$1,000,000 US - $10,000,000 US


Terraphase was founded in 2010, in Oakland, California, by four principals with over 80 years of combined environmental consulting experience and significant accomplishments in site investigations and soil and groundwater remediation throughout the Unites States and Canada. Our principals and staff have provided services for many private clients and public entities. Terraphase principals and several of our staff are registered professionals in civil engineering, geology, hydrogeology, and geotechnical engineering. Terraphase is a small business enterprise and an Alameda County Small, Local Emerging Business (SLEB).


We take great pride in our professional commitment to our clients' needs. Terraphase was founded on what we believe are the key tenets of client service. These principles include dedication to technical quality, responsiveness and flexibility, and cost-effective project management. We strive to understand and meet our client's needs and expectations. As a small and local business, we are nimble and able to rapidly respond to project needs, without excessive and unnecessary layers of project management, thereby maximizing cost effectiveness.


The experience and technical expertise of Terraphase engineers, geologists, and scientists qualifies us for a wide variety of projects. Our professionals have extensive experience in the following services:

Contaminated Soil and Groundwater Investigations

  • Multi-media chemical sampling and analysis, and chemical data quality
  • Drilling, excavating and sampling for geological, geotechnical and chemical characterization
  • Soil, water, and air sampling
  • Installation of groundwater monitoring wells networks

Soil and Groundwater Remediation

  • Hazardous and non-hazardous waste excavation, manifesting, transportation, storage, treatment and disposal
  • In situ soil and groundwater treatment, including direct injection, well injection, and soil stabilization
  • Ex situ treatment, including the design, installation, and operation of extraction systems
  • Design, operation and maintenance of groundwater treatment plants
  • Demolition and debris removal and disposal
  • Landfill operations and maintenance for closed landfills, including landfill gas sampling

Preparation of Superfund Documents

  • Remedial investigations and feasibility studies (RI/FS)
  • Records of Decision (RODs)

Geotechnical Engineering

  • Design of excavation supports
  • Design of equipment foundations
  • Slope stability analyses
  • Design of access trails and pedestrian bridges
  • Cap and liner design

Litigation Support Services

  • Preparation of expert reports
  • Remedial cost estimates
  • Preparation of declarations
  • Expert witness services

Regulatory Compliance

  • Agency interaction and negotiations
  • Stormwater and drinking water compliance programs in accordance with Clean Air and Water Act, Porter-Cologne, and NPDES requirements

Property Transfer and Environmental Due Dilligence

  • Phase I Environmental Site Assessments
  • Phase II Environmental Site Assessments