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Environmental Investigation and Remediation
Northgate offers a full array of site investigation and remediation services, ranging from preliminary site assessments to comprehensive remedial investigations and cleanups. We focus on understanding our client's needs and objectives in order to identify the most appropriate investigation and remediation approach for a given site. Northgate has built a solid reputation for technical excellence, with a commitment to providing high-quality work at a reasonable cost. Our clients include private property owners, land developers, and local, state, and federal governments. The company specializes in:
- Phase I and Phase II Site Assessments
- NCP Compliant Preliminary Assessments and Site Inspections
- Remedial Investigations and Feasibility Studies
- Hydrogeologic Investigation and Geochemical Characterization
- Innovative Treatment Technologies
- Risk-Based Corrective Action and Natural Attenuation Evaluation
- Regulatory Liaison and Negotiation
- RCRA Facility Investigations
Experience
Northgate's environmental investigation and remediation professionals include hydrogeologists, geologists and engineers. Our diverse expertise allows us to respond to a wide range of investigation and remediation issues, including:
- Petroleum Hydrocarbons and USTs
- DNAPL and LNAPL Releases
- Emergent and Recalcitrant Chemicals
- Pesticide Mitigation
- Source Identification of Commingled Plumes
- Evaluation of Chemical Migration Pathways
- Insitu Treatment Technologies
- Development of Risk-Based Cleanup Goals
- Construction Management Services
- Detection and Removal of Munitions and Explosives
- Treatment and Disposal of Affected Soil
- Third-Party Oversight
Case Study
Designated a model cleanup by state and local agencies, this project involved a closed landfill that was redeveloped with single-family residences. Our work included extensive regulatory management activities and litigation support. All environmental activities were highly scrutinized by the public, media, regulatory agencies, and other consultants. Intensive reviews of historical documents and aerial photographs were performed to develop a strategy for remedial investigations. Based on these reviews, as well as on-site surveys of surface water, soil, soil gas, indoor air, groundwater, and leachate, several operable units were identified and interim remedial excavation and removal activities were conducted. Other interim measures involved the removal of underground storage tanks, debris, tanning wastes, scrap metal, tires, and affected soils. A feasibility study was conducted to evaluate several remedial alternatives for the remaining areas. The recommended alternative included excavation and off-site disposal of wastes, soil-gas extraction and treatment, and in situ stabilization of affected soil and wastes.
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Residential Development on Former Landfill
Solano County, CA
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Additional Project Experience
Our accomplishments include the cleanup of numerous federal and state Superfund sites. Notable projects include:
- U.S. EPA Superfund Site, Solvent Release Santa Clara County, CA
- State Superfund Site, Solvent Release Santa Clara County, CA
- Former Military Arsenal/Residential Development Solano County, CA
- Former Chromium Waste Disposal Pit Mendocino County, CA
- Former Industrial/Residential Development Santa Clara County, CA
- Research and Development Facility Alameda County, CA
- Former Military Facility Alameda County, CA
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