Meet Our Team

Adrienne LaPierre, Principal and President

Practice Areas: Human Health Risk Assessment, Exposure Assessment, Toxicology, Risk Management, and Risk Communication

Ms. LaPierre has more than 20 years of experience in environmental consulting, with emphasis on toxicology and human health risk assessment. She has managed or performed multipathway risk assessments for Superfund sites, RCRA facilities, petroleum release sites, town gas sites, and various types of industrial properties. She has extensive experience in performing critical evaluations of the toxicological literature, defining dose-response relationships, establishing exposure limits, and evaluating potential causal associations between chemical exposures and documented adverse health effects.

Nicholas T. Loizeaux, P.G., Principal

Practice Areas: Brownfields Redevelopment, Site Investigation and Remediation, Geologic and Hydrogeologic Site Characterization, and Hazardous Materials/Waste Management

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.

Sandra H. Stevens, Principal

Practice Areas: Brownfields Redevelopment, Site Investigation and Remediation, Environmental Compliance, Hazardous Materials/Waste Management

Ms. Stevens has over 15 years of experience in environmental management. She recently served as Associate Vice-President for Environmental Services for Catellus Development Corporation, a San Francisco Bay Area real estate developer. In this position, she directed all environmental activities for the company, including compliance with environmental laws and regulations, the regulatory approval process, due diligence requirements, remediation of contaminated properties, and community outreach and education.

Gregory S. Noblet, P.E., Principal

Practice Areas: Site Characterization, Vapor Intrusion Evaluation and Mitigation, Emissions Estimation, Dispersion Modeling, Health Risk Assessment

Mr. Noblet is a California professional engineer with more than 18 years of consulting experience, including 15 years with Iris Environmental. He has designed numerous subsurface site investigations to characterize impacts to soil, groundwater, and soil gas. He specializes in emissions estimation and dispersion modeling to evaluate impacts to offsite receptors; and in vapor intrusion assessments, where multiple lines of evidence must be considered in evaluating indoor air sampling results. He has worked with several analytical laboratories to develop helium shrouds and soil gas sampling trains compliant with the Cal/EPA Soil Gas Advisory. One of Mr. Noblet's current interests is incremental sampling methodolgy, a potentially much more powerful soil sampling methodology than traditional discrete soil sampling.

Todd Bernhardt, Principal

Practice Areas: Human Health Risk Assessment, Site Investigation and Characterization, Exposure Assessment, Toxicology, Risk Management, and Risk Communication

Mr. Bernhardt has more than 16 years of experience in environmental consulting, with emphasis on human health risk assessment, site investigation and characterization, vapor intrusion modeling, and toxics regulations compliance. He has managed or performed multi-pathway risk assessments for numerous properties under both federal and state regulatory programs, including power plant sites,  utility service stations, former manufactured gas plants, and naval installations, and has served as the primary client and agency point of contact for all risk-related issues for these properties. In addition, he has completed several consumer product risk assessments for Proposition 65 (California's Safe Drinking Water and Toxic Enforcement Act) compliance, and he has provided technical support for tesimony in toxics-related litigation.

Craig Pelletier, P.G., Principal

Practice Areas: Brownfields Redevelopment, Site Investigation and Remediation

Over the past 20 years, Mr. Pelletier has designed and executed hundreds of subsurface investigations, coordinated several emergency response jobs, and worked on fast-track brownfield redevelopment projects with challenging environmental problems. He assists clients with the development and implementation of numerous remediation programs involving soil excavation, soil vapor extraction, dual-phase extraction, air sparging, bioremediation, phytoremediation, chemical injections, and groundwater pump and treatment. With a focus on practical solutions, Mr. Pelletier works closely with developers, engineers, toxicologists, and regulatory agencies to lead his clients to favorable results.

David Grunat, P.G., C.H.G., Principal

Practice Areas: Brownfield Redevelopment, Environmental Consulting, Technical Consulting

Mr. Grunat is a Senior Manager at RPS. He has over ten years of experience as a technical consultant in the fields of geology, hydrogeology, and contaminated site investigation and remediation. His work includes: project management; remediation of soil, groundwater and soil vapor through traditional and innovative technologies; contaminant fate and transport; hydrogeology; regulatory negotiations; and litigation support. He has experience of project manager of a portfolio of over 40 active and former service station cleanup sites for a Fortune 500 Oil Company. Mr. Grunat has partnered with owners, developers, and contractors to facilitate project success.

Lisa Bongiovanni, P.E., Principal

Practice Areas: N/A

Lisa Bongiovanni joined RPS as a senior environmental consultant in 2007, and was appointed to lead the firm's Compliance Services group in Chicago in 2010. In 2016, Lisa transferred to RPS’s Southern California office to better serve our clients with environmental compliance obligations on the west coast. Lisa manages a team of technical experts in environmental regulations, including EPCRA reporting, air, wastewater, and storm water permitting, waste management, and other regulations impacting commercial and manufacturing companies. Lisa provides technical support to financial and strategic deal teams and to industrial clients during regulatory enforcement actions and business transactions and develops environmental management strategies.

Spencer Jackson, Principal

Practice Areas: Environmental Consulting, Environmental Assessments, Regulatory Compliance Audits, Transaction Advisory Services

Mr. Jackson is a Director of Transaction Advisory Services group in RPS’s Irvine CA office. In this role, Mr. Jackson’s responsibilities include business development and overseeing a wide variety of environmental projects for lenders, private equity firms, attorneys, real estate and industrial clients. Mr. Jackson has been involved in over 500 Phase I Environmental Site Assessments and compliance reviews, covering a wide variety of industrial and commercial settings in over 15 countries including projects in Europe, North and South America, Asia and Africa. Mr. Jackson’s project responsibilities include coordinating environmental due diligence work associated with portfolio deals; conducting, overseeing and reviewing various environmental reports; quantifying potential environmental liabilities; and providing technical support to legal, financial, and corporate clients during transactions.

Warren Chamberlain, P.G., CHG., P.E., Principal

Practice Areas: Site Characterization, Environmental Consulting, Site Investigation and Remediation

Mr. Chamberlain has over 28 years of experience in the fields of civil and environmental engineering, and natural resource exploration. He has strong project management, budget estimation, contract negotiation, regulatory negotiation, proposal development, permitting, staff mentoring and report presentation skills. He is proficient at managing multiple projects of varying complexity in scope, organization, budget and schedule. His use of diverse expertise has resulted in significant cost savings to client projects. Mr. Chamberlain has prepared remediation designs and abatement systems for various contaminants.

Martin Hamann, PG, C.H.G., Principal

Practice Areas: Site Investigation and Remediation, Environmental Assessment, Litigation

Mr. Hamann is Vice President of the Site Investigation and Remediation Division for RPS Group in its Irvine, California office. He is a California professional geologist and hydrogeologist. He is responsible in establishing, implementing and delivering environmental results for governmental and non-governmental agencies, industrial clients, attorneys, financial institutions, and insurance companies. He has as a strong blend of technical, scientific, and business sense and consistently provides value on environmental matters. Mr. Hamann has over 25 years of performance and management of numerous Environmental, Health and Safety (EHS) programs, site investigations, environmental assessments, due diligence for property transactions, aquifer characterizations, and remedial actions.

John P. McLaughlin, P.E., Principal

Practice Areas: Environmental Risk, Construction Risk Management, Environmental Consulting, Human Health Risk, Ecological Risk

Mr. McLaughlin is the Senior Manager within the Tech Sector Advisory Group, and has been with RPS for almost 10 years. Mr. McLaughlin is a California professional engineer. His academic and work experience has emphasized vapor intrusion analysis, risk characterization, chemical fate and transport, air quality monitoring, air quality modeling, and emissions estimation.  Additionally, he has experience providing environmental support for real-estate transactions and redevelopment projects.  He has significant experience in developing and managing the implementation of construction risk management plans.

Julie Hayes, P.G., Principal

Practice Areas: Brownfield Redevelopment, Litigation, Site Characterizations

Ms. Hayes is a Senior Vice President at RPS with over 15 years of experience in Brownfield redevelopments, subsurface soil and ground water assessments, third party review and litigation support, cost allocation studies, environmental due diligence, site characterizations, and designing and implementing ground water monitoring programs.  She specializes in the solutions of complex subsurface contamination problems addressing specific issues of time and origin of chemical releases, media affected by such releases, and project management.  Ms. Hayes is a registered Professional Geologist in the states of California, Oregon, and Washington.