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Nicholas T. Loizeaux, P.G., Principal, (510) 834-4747 ext. 14, Download Vcard

Mr. Loizeaux is a California professional geologist and has over 20 years of experience as a technical consultant in the fields of geology, hydrogeology, and contaminated site investigation and remediation.

Most of this work has been conducted in the context of Superfund, due diligence compliance, litigation, or Brownfields redevelopment. Mr. Loizeaux has designed and implemented numerous site investigations, which have included hundreds of soil borings, monitoring well installations, monitoring well decommissionings, subsurface geophysical investigations, aquifer tests, and soil, groundwater, and soil gas sampling efforts. He has brought a number of underground and above-ground storage tank (UST/AST) cases to closure, brought a number of sites to closure, and has conducted numerous due diligence audits of manufacturing, agricultural, and commercial properties.

Representative Project Experience

Mission Bay Development Project

Provided technical leadership and overall project management for the 20-year build-out of the Mission Bay site in San Francisco, California, one of the largest Brownfields projects in the western United States. The project covers an area over 300 acres, and is being redeveloped for mixed-use residential and commercial uses.

New uses are to include a University of California campus; an entertainment complex; high-density housing; public open space; retail and commercial uses; a hotel; a police and fire station; and office, biotechnology, and research and development facilities. Varied industrial uses and complex historical fill activities have resulted in a broad array of contaminants such as heavy metals, petroleum hydrocarbons, and asbestos requiring mitigation during construction and development.

Mr. Loizeaux provided strategic oversight on site investigations, hazardous waste handling and disposal, remediation of a mixed-fuel hydrocarbon plume, development of worker health and safety protocols, preparation of storm water pollution prevention plans, monitoring of storm water compliance, monitoring of dust emissions during construction activities, and compliance with the City of San Francisco Article 22A hazardous waste ordinance.

Former Air Force Base Remediation

Provided technical leadership and overall project management for the site assessment, acquisition, and remediation of two Los Angeles Air Force Base sites for conversion to residential site use in the greater Los Angeles region.The two sites, encompassing 55 acres, had been utilized since the 1950’s for classified aerospace research, office, and recreational purposes.

RPS Iris Environmental prepared Phase I Environmental Site Assessments in accordance with ASTM Standard E 1527-00, and negotiated with the Air Force for further Phase II site investigations. Based upon the results of site investigations, Iris Environmental prepared Site Characterization and Human Health Risk Assessment reports for review and approval by the Los Angeles Regional Water Quality Control Board and Office of Emergency Health Hazard Assessment in Sacramento, California.

Both sites, with documented chlorinated solvent impacts in underlying groundwater, have been closed by the regulatory agencies, with residential redevelopment underway.

Facility Closure and Regulatory Compliance

Managed numerous facets of the closure and decommissioning of a former paperboard recycling and manufacturing mill in Antioch, California. Mr. Loizeaux oversaw preparation of a site-wide asbestos and lead paint survey, the revision of the facility’s Stormwater Pollution Prevention Plan (SWPPP), and revision of its Spill Prevention, Control, and Countermeasures (SPCC) Plan.

For an operating power plant on the property, Mr. Loizeaux oversaw all components of the facility’s compliance with its National Pollutant Discharge Elimination System (NPDES) permit including monthly, semi-annual, and annual sampling requirements of influent, effluent, and receiving water (San Joaquin River) and associated reporting.

Expert Witness

Served as expert witness for diatomaceous earth quarrying and processing client (defendant) in northeast California. Plaintiff alleged violations of the Clean Water Act in regards to stormwater discharge and non-compliance with facility’s National Pollutant Discharge Elimination System (NPDES) permit issued and administered by a Regional Water Quality Control Board.

Mr. Loizeaux reviewed relevant documents including existing Stormwater Pollution Prevention Plan (SWPPP) and deposition testimony, conducted a site visit to assess Best Management Practices, facility monitoring, and record-keeping practices, and issued an expert opinion on the merits of the plaintiff’s case. The case was settled favorably for the client. Mr. Loizeaux authored revisions and directed the re-issuance of the facility’s SWPPP.

Served as expert witness for one of country’s largest aggregate mining companies in defense of alleged unfair business and trade practices related to environmental matters at an aggregate mine in the Yuba Goldfields of California.

Mr. Loizeaux reviewed deposition testimony, conducted a site visit, interviewed facility personnel, reviewed facility documents and record-keeping, counseled client on the merits of the allegations, and provided expert witness deposition testimony. Mr. Loizeaux’s testimony provided expert opinions on hazardous waste management, compliance with the Clean Water Act, compliance with Waste Discharge Requirements, compliance with the General Permit for Stormwater Discharges, assessment of the facility’s Spill Prevention and Pollution Prevention Plan (SPCC), and media sampling protocols.

The two-year old case settled favorably for the client within days of Mr. Loizeaux’s deposition testimony.


M.S., Geological Sciences, University of Colorado. 1995
B.A., Highest Honors, Geological Sciences, Williams College. 1991.