QES has also established a select network of independent practitioners who support all facets of project execution, from graphics and data management to risk assessment and data validation. Ms. Quinn personally ensures consistency in work product and the high level of responsiveness and quality her clients have come to expect.

Catherine Quinn, PG, CHG

Ms. Quinn is Managing Principal Hydrogeologist of Quinn Environmental Strategies, Inc. (QES), with over 25 years consulting and industry experience in contaminant hydrogeology, performing technical design, implementation, and analysis of all phases of remedial investigations, feasibility studies, and remediation, including successful agency negotiations. She provides due diligence and litigation support, having managed more than 25 litigation cases through discovery and deposition phases, and in mediation to achieve settlement. Ms. Quinn has performed numerical and analytical modeling to support fate and transport analyses for negotiation of regulatory cleanup criteria for soils, and for enhancement of groundwater pump and treat system performance.

Ms. Quinn has guided projects through technical design, implementation, and analysis of all phases of remedial investigations, feasibility studies, and remedial alternative design/implementation, and site closure including at numerous industrial and petroleum facilities, landfills, municipalities and Ports (including the Ports of Los Angeles, Long Beach, and Stockton), and government bases throughout California, Arizona, and Nevada, including at several Superfund or Comprehensive Environmental Response Compensation and Liability Act (CERCLA) National Priorities List (NPL) Sites.

Ms. Quinn has performed numerical and analytical modeling to support fate and transport analyses for negotiation of regulatory cleanup criteria for soils, and for enhancement of groundwater pump and treat system performance, and has assisted in the development of Geographic Information Systems (GIS) and three-dimensional finite element and finite difference numerical models for design and simulation of alternative groundwater basin operational schemes (including primarily Modflow and the Coupled Fluid Energy and Transport [CFEST] code).

Peter Mock, Ph.D, PG, PH, President and Principal Scientist at Peter Mock Groundwater Consulting, Inc. (PMGC) since 1997, B.Sc. Hydrology

(1981) PhD. Hydrology, minor in Applied Mathematics (1997), University of Arizona with experience working at Arizona Department of Water Resources and at CH2M Hill. Peter’s work specializes in numerical simulations of flow and transport with extensive experience collecting and interpreting basic geologic, hydrologic and chemical data. Projects of note in his resume include regional simulations of the Irvine Sub-basin in southern California, of the carbonate system of southeastern Nevada, and of the N and D Aquifers of northeastern Arizona, as well as Remedial Investigations of several federal Superfund Sites, including Tucson International Airport, Phoenix-Goodyear Airport, Indian Bend Wash, San Gabriel Valley, Montrose-Del Amo and MCAS El Toro. Peter has also worked on subsidence, artificial recharge, and dewatering projects, and on the adjudication of water rights on the Gila River Watershed. He was a Neutral Expert for groundwater modeling on the Guadalupe Oil Field Meditation and oversaw the remediation of two multi-million gallon jet fuel spills beneath an airport property. Peter has spoken at numerous conferences on water resources and environmental science and has given short courses on aquifer test analysis and numerical modeling.

John McCabe, CSP, QEP, REA, CEM, President of MEHS Consulting

John McCabe has over 30 years of experience in national and international Environmental Health and Safety (EHS) programs, including multi-media regulatory compliance, serving clients in manufacturing, oil and gas, biotech/pharmaceutical/medical device, aerospace, electronics, government, and construction fields, including in a litigation context. He has managed EHS teams and services for large consulting organizations and in private industry, including for Workers Compensation Claims, Accident Investigation, H&S Compliance Program Development, Emergency Response, and Environmental Regulatory Compliance Audits.

James Brezack, LEED Green, President of Brezack and Associates

Jim’s nearly 30 years experience in the water industry includes sustainable water conservation and energy consumption studies, master planning and design of water, sewer, water supply and recycled water facilities, utility planning and all phases of California Environmental Quality Act (CEQA) compliance. He codes real-time solutions for measurement and verification to suit client requirements, resulting in accurate monitoring and cost effective implementation of water usage plans. He has successfully permitted projects and gained permit exemptions under the Clean Water Act (Section 404, 401 and Waste Discharge Requirements [WDRs]), Sections 7 and 10 of the Endangered Species Act, Department of Fish and Game, Coastal Development Permits from local agencies and the California Coastal Commission.

Dr. Jill Ryer-Powder, Principal Health Scientist, Environmental Health Decisions

Dr. Ryer-Powder is the Principal Health Scientist at Environmental Health Decisions providing expertise in the fields of toxicology, human health risk assessment, and product hazard evaluation. She received her Bachelor’s Degree in Nutrition from Cornell University, her PhD in Toxicology from Rutgers University, and did post-doctoral work at University of Southern California/ Children’s Hospital of Los Angeles. She brings more than 25 years of experience in litigation support, risk assessment, Proposition 65 evaluation, and occupational toxicology to human health hazard and evaluation projects. In her position, Dr. Ryer-Powder is responsible for strategic preparation, project management, and evaluation of chemical toxicity for risk assessment and product hazard evaluation projects. She is also involved in the investigation and analysis of legal and regulatory issues and controversial claims regarding chemical causation of diseases in humans. Her solid technical background, coupled with her frequent involvement in risk and hazard evaluation projects, gives her a broad perspective on the technical, economic and regulatory considerations for human health hazard evaluation work.

Dr. Ryer-Powder was a pioneer in the development of safe exposure levels for petroleum fuels and ammonia. She has extensively researched the toxicological issues surrounding human exposures to petroleum hydrocarbons, ammonia, and chlorinated hydrocarbons. In her experience in evaluating potential hazards from chemicals, she has worked extensively with USEPA Region IX, Cal/EPA Department of Toxic Substances Control, Los Angeles Regional Water Quality Control Board, San Diego Regional Water Quality Control Board, and Orange County Health Care Agency. Negotiations have involved presentation and approval of health risk assessments, health-based cleanup levels, and the setting of safe levels of exposure in the occupational and public arena.

Dr. Ryer-Powder has managed and performed more than 100 health risk assessments for local and national clients. Her site experience includes Preliminary Endangerment Assessment risk assessments, Proposition 65 evaluations, federal and state Superfund sites, Manufactured Gas Plant sites, RCRA sites, and Brownfields sites. She has prepared hundreds of Material Safety Data Sheets (MSDSs) and product labels for consumer and industrial products, including petroleum fuels, solvents, metals, fertilizers, pesticides, adhesives, and fabric protectors. She has worked with trade associations, private industry, and regulatory agencies to develop safe exposure levels to petroleum products and ammonia. She has presented results of risk assessments in public meetings. She has also provided expert testimony in cases involving exposure to metals, solvents, and petroleum hydrocarbons. Dr. Ryer-Powder has lectured on several occasions on the subject of risk assessment to students in the University of California system.

William Sedlak, PE – Principal Consultant, Remediation and Permitting

Mr. Sedlak has extensive experience in engineering and project management, with areas of specialty in chemical and environmental engineering. He has managed environmental design and remediation projects ranging from a few thousand dollars to multi-million dollar efforts. Mr. Sedlak is a registered Professional Chemical Engineer in California and a Registered Environmental Property Assessor. He has extensive expertise in the evaluation, permitting, selection, design and specification of soil and groundwater treatment and remediation systems and the management of complex environmental projects. Additionally, Mr. Sedlak has hands-on experience in the installation, operation and troubleshooting of different remediation systems.

Mr. Sedlak has represented his clients in presentations to regulatory agencies, such as the U.S. EPA, California Energy Commission, the California Department of Toxic Substances Control and Regional Water Quality Control Boards, air districts, and local city and county departments, explaining project objectives and details and facilitating the exchange of requirements and issues. Mr. Sedlak has successfully coordinated with regulatory agencies and client staff to expedite project schedules and obtain permits or site closures, and has provided briefings and status reports in public hearings. He has an established track record for meeting project schedules and maintaining budget control.

Mr. Sedlak has a Master’s degree in Environmental Studies, and Bachelor’s degrees in Chemical Engineering and Chemistry. He also has a Certificate in Hazardous Materials Management, from the University of California, Irvine and has 40-Hour OSHA Hazardous Waste Operations (Hazwoper) Health and Safety Training; Hazwoper Management and Supervisor Training and annual refresher training.

David Johnson, founder and Principal Geologist of DMJ Consulting Group, has over 28 years of experience in the fields of groundwater monitoring and hydrogeology, municipal water resources, environmental/remedial investigation (RI/FS), environmental and hazardous waste management, mining, Phase I/Phase II site investigations, construction oversight, regulatory agency interaction, water quality, and groundwater resource development.  Mr. Johnson’s backgound includes planning, staffing, budgeting and oversight of field construction operations, regulatory agency interaction, budget tracking and management, and a wide range of geologic and hydrogeologic skills, including: well design/specification (large-capacity public supply wells and monitoring wells), construction/spec. management and contractor oversight, soil, groundwater and soil vapor sampling, Westbay multiport well design and sampling, mine dewatering programs, vapor intrusion assessments, health risk evaluation, borehole logging, groundwater monitoring programs, borehole geophysics, aquifer pump testing and hydrogeologic characterization.  Mr. Johnson is also an adjunct professor of Physical Sciences at Citrus College in Glendora, California, where he teaches courses in geology, physical geography, oceanography, and GIS.

When appropriate, QES expands service solutions by collaboration to address mutli-disciplinary environmental challenges.