Our Team

Bill Weaver

Bill Weaver

Ph.D., CEO, Principal Geomorphologist, President
McKinleyville Office

Dr. Weaver has over 27 years of professional experience in the fields of process geomorphology, surface water hydrology, watershed management, and engineering geology.  Since forming Pacific Watershed Associates, his work has focused on forest geomorphology, and the hydrologic and cumulative effects of land management on forested watersheds and wetlands ecosystems.

Danny Hagans

Danny Hagans

B.S., Principal Earth Scientist, Vice President
McKinleyville Office

Mr. Hagans has extensive experience in conducting large scale, basin-wide erosion inventories and assessments, as well as implementing watershed rehabilitation and restoration projects in Northern California and elsewhere. Since joining Pacific Watershed Associates in 1990, Mr. Hagans has managed and conducted a variety of projects related to wildland hydrology and erosion processes, including sediment source assessments of over 2000 mi2 of managed forest land and erosion inventories and sediment reduction plans for literally thousands of miles of wildland forest roads, ranch roads, rural subdivision roads, vineyard roads, parkland roads, and county maintained public roads throughout California.

Eileen Weppner

B.S., P.G., Senior Geologist
McKinleyville Office

Ms. Weppner has extensive experience in designing and conducting geomorphic and geologic assessments, including watershed assessments and watershed analysis, erosion inventories, erosion control projects, field surveying, and stream channel mapping. She provides the quality control and quality assurance of Pacific Watershed Associates data management and scientific analysis.

Randy Lew

Randy Lew

B.A., P.G., CPESC, QSD/QSP, Associate Geologist
McKinleyville Office

Mr. Lew is an associate geologist with extensive experience in geologic and geomorphic investigations leading to related remediation and mitigation projects throughout Northern California. His work experience has emphasized applied geomorphic investigations that result in development of erosion control and erosion prevention plans for federal, state and private landowners. He has overseen multiple watershed sediment source assessments and supervised large-scale erosion remediation projects. Additionally, Mr. Lew has extensive experience in the development of Storm Water Pollution Prevention Plans (SWPPPs). He is a qualified SWPPP Developer/Practitioner (QSD/QSP) and is a California Stormwater Quality Association certified Trainer of Record (ToR) for required QSD/QSP coursework.

Tom Leroy

M.S., P.G., C.E.G., Associate Geologist
McKinleyville Office

Mr. Leroy specializes in watershed analysis and erosion control, Holocene stratigraphy, and coastal geomorphology . His experience with Quaternary geology and geomorphology studies also includes Seismic hazard assessment, neotectonics, landslide and sediment source inventory, and environmental restoration.

Brad Job

B.S., P.E., Senior Civil Engineer
McKinleyville Office

Mr. Job has 21 years of  experience in civil, environmental, and water resources engineering. He brings to the position extensive experience in regulatory compliance and permitting, surface and groundwater hydrology, landslide and slope stability processes, stormwater management, drinking and wastewater treament systems, watershed management, as well as environmental remediation and restoration.

Kathy Moley

Kathy Moley

B.S., P.G., Associate Geologist
McKinleyville Office

Ms. Moley has been Project Geologist and Division Leader of the Environmental Division at Pacific Watershed Associates, Inc. since 1998. Her extensive experience in subsurface geologic characterization and septic design provides clients with custom solutions to difficult development issues. She also is an expert in tsunami mitigation strategies and is an active participant in geologic hazard community planning and education.

Todd Kraemer

B.S., CPESC, QSP/QSD, Project Hydrologist
McKinleyville Office

Mr. Kraemer specializes in Watershed analysis and hydrology.  He has extensive experience interacting with diverse landowners across state lines and brings effective solutions to sediment control, road upgrading, and hydrologic monitoring projects.

Tara Zuroweste

Tara Zuroweste

B.A., P.G., CPESC, QSP/QSD, Associate Geologist
Petaluma Office

Ms. Zuroweste is the program manager for the Santa Rosa (North Bay) office of Pacific Watershed Associates. She established the Environmental Division at the North Bay office in 2008. She specializes in commercial and residential development and watershed analysis. Her extensive experience in subsurface geologic characterization and septic design provides clients with innovative, cost-effective, and environmentally friendly solutions to difficult development issues. Ms. Zuroweste is also a certified CGP QSD/QSP Trainer of Record.

Chris Herbst

Chris Herbst

B.S., P.G., Project Geologist
McKinleyville Office

Mr. Herbst geologic studies have focused on watershed analysis and wildland geomorphology. Additionally, his earth science proficiency includes geologic and geomorphic mapping, water quality monitoring, and geomorphology.

Colin Hughes

B.S., P.G., QSP/QSD, Project Geologist
McKinleyville Office

Mr. Hughes’ geologic studies have focused on watershed analysis and wildland geomorphology. Additionally, his earth science proficiency includes aerial photo analysis of geology and mass wasting features, geologic and geomorphic mapping, road-related watershed analysis, and geomorphology.

Joel Flynn

B.S., P.G., Project Geologist
McKinleyville Office

Mr. Flynn has extensive experience in geologic and geomorphic analysis as they relate to land management.  His experience is primarily in THP development, road-related watershed analysis, and geologic mapping.

Whelan Gilkerson

Whelan Gilkerson

M.S., Natural Resources/GIS Specialist
McKinleyville Office

Mr. Gilkerson has experience in hydrology, erosion control, and marine ecology. He has performed water quality and contaminant monitoring, and has overseen the construction of large-scale erosion control projects.  He has also conducted eelgrass habitat investigations and estuarine modeling studies for regulatory compliance and conservation interests.

Justin Bissell

Justin Bissell

B.A., GIS Analyst
McKinleyville Office

Mr. Bissell specializes in analysis and mapping for wildland and urban planning and resource studies. His experience spans a wide range of GIS and geomorphological topics including: watershed modeling and spatial analysis, paleoclimatological mapping, aerial photographic analysis, habitat restoration and planning, and environmental sensitivity modeling and analysis.  Justin also has extensive experience in archaeological and paleontological cartography, producing GIS products for research, field work, and reporting for CEQA clearances.

Shannon Butler

Shannon Butler

B.S., Staff Geologist
Petaluma Office

Ms. Butler has experience in geologic studies involving Quaternary soil geomorphology, geotechnical investigations, soil analysis, and watershed assessment.  She currently specializes in road-related erosion control with a primary focus on heavy equipment supervision as it relates to road upgrading and decommissioning.

Greg Martin

BS., Staff Geologist
Petaluma Office

Mr. Martin has broad experience in environmental geology, geotechnical investigations, and watershed assessment.  He currently specializes in road-related erosion control with a primary focus on road related sediment source investigations and heavy equipment supervision as it relates to road upgrading and decommissioning.

Ann Cottone

M.B.A., Financial Manager
McKinleyville Office

Ms. Cottone has over three decades experience in the field of business management and accounting.  She is responsible for managing financial processes, providing a broad range of accounting, analytical, and administrative functions.  She also provides risk management, human resource services, and supervision of the administrative staff. 

Courtney Kopp

B.A., Geological Technician
McKinleyville Office

Ms. Kopp has a background in geologic and geomorphic mapping, knowledge of local geology, geological principles and practices including hydrology, and physical geology. She has experience in conducting field-based watershed assessments with a focus on road-related erosion control and sediment reduction. She is also involved in soil analysis for septic and leachfield design and development.

Chris Moore

Riparian Specialist/Watershed Technician
McKinleyville Office

Mr. Moore specializes in construction and design of in-stream fish habitat and riparian enhancement projects. He has conducted numerous fish habitat enhancement projects including, constructed log jams as well as bioengineered stream bank stabilization. He also has extensive experience in eelgrass and estuary habitat restoration in Central and Southern California.

Clay Allison

Geological Technician
McKinleyville Office

Mr. Allison specializes in  watershed assessment, road-related sediment source investigations, and has experience overseeing heavy equipment as it pertains to road decommissioning.

Audi Thoele

B.S., Watershed Technician/Botanist
McKinleyville Office

Mr. Thoele has experience conducting watershed assessments and assisting with road decommissioning project layout and design as well as eelgrass surveys. His background includes botanical restoration work in alpine meadow habitat in Yosemite National Park.

Eileen Hemphill-Haley

PhD, Adjunct Geologist
McKinleyville Office

Dr. Hemphill-Haley is a former researcher with the USGS specializing in coastal and marine geology, micropaleontology, and paleoseismology. She collaborates with Pacific Watershed Associates staff on coastal paleoseismic research projects.

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