Dr. Weaver has over 35 years of professional experience in the fields of process geomorphology, surface water hydrology, watershed management, and engineering geology. Since cofounding Pacific Watershed Associates in 1989, his work has focused on forest geomorphology, and the hydrologic and cumulative effects of land management on forested watersheds and wetlands ecosystems.
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 cofounding Pacific Watershed Associates in 1989, Mr. Hagans has managed and conducted a variety of projects related to wildland hydrology and erosion processes, including sediment source assessments of over 2,000 square miles 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.
Ms. Weppner is a Senior Geologist and General Manager for the Watershed Assessment/Restoration and Compliance divisions of PWA. She has experience in conducting all elements of watershed assessments, erosion inventories, field surveying, stream channel mapping, implementation of road upgrading/road decommissioning projects, and paleontological resource investigations. For these projects she has been the lead on sampling strategy development; statistical analysis; and quality control and quality assurance. She is also responsible for report writing, proposal writing, technical review, and public outreach for watershed-related and environmental compliance projects. In addition, she also oversees all aspects of GIS and database applications at PWA.
Mr. Orum has over 20 years of experience working with multidisciplinary teams throughout the country as an engineer. He has been involved in all facets of stream and watershed restoration design for projects located in impacted environments. He has specific expertise in hydrologic and hydraulic analysis, scour and erodibility investigations, bed and bank stabilization design, stream simulation culvert design, fish passage analysis, dam removal, natural habitat design, topographic surveying, AutoCAD, and construction oversight. A graduate of Humboldt State University in Environmental Resources Engineering, Greg has also attended workshops specifically focused on fish passage, road/stream design, instream habitat, geomorphology, sediment transport, and construction oversight.
Mr. Leroy specializes in interdisciplinary fisheries habitat restoration, Holocene stratigraphy, and coastal geomorphology. His experience with Quaternary geology and geomorphology studies also includes seismic hazard assessment, neotectonics, landslide assessments, sediment source inventory, and geotechnical analysis.
Ms. Moley has been a Geologist and Manager of PWA’s Environmental Division since 1998. Her extensive experience in subsurface soil and geologic characterization assists clients with their development needs, including preliminary soils reports and wastewater treatment system site investigations and designs. She is still hopping in and out of test pits, logging soils and conducting percolation testing. More recently, Ms. Moley has become well-versed in water rights and land use permitting at the county and state levels. In this rapidly evolving regulatory framework, she has been able to provide sound advice and project direction. Furthermore, Ms. Moley is experienced in earthquake and tsunami mitigation strategies and engages in geologic hazard community planning and education.
Mr. Kraemer is a Certified Erosion and Sediment Control Specialist and Qualified Stormwater Prevention Plan Developer and Practitioner certified by the California Stormwater Quality Association. He conducts Storm Water Pollution Prevention Plan (SWPPP) preparation and implementation as a Qualified SWPPP Developer/Practioner and Certified Professional in Erosion and Sediment Control. Mr. Kraemer’s work experience has emphasized applied hydrology and field sampling. He is trained and has extensive field experience in surface water hydrology, erosion and stormwater assessments, erosion inventories, erosion prevention planning, and road- and trail-related erosion control and prevention. He is skilled in a variety of sampling strategies and techniques for hydrologic variables, physical stream parameters, and biological conditions.
Mrs. Weese has been with PWA since 2006. As the Program Manager and a Lead Scientist for PWA’s North Bay Petaluma office, she specializes in applied geomorphology, sediment source evaluations, and sediment reduction treatment plans for rural residential and forestland road networks from small, private landownerships to basin-wide areas. Duties and responsibilities include supervising all aspects of project work, including contract development and budget preparation, field evaluations, geomorphic mapping, data analysis, proposal and report writing, as well as oversight of heavy equipment operations.
Mr. King has been working as an engineer for over eight years and has experience designing, managing, and constructing projects that focus on riparian and instream habitat, fish passage, coastal resiliency, erosion control, and rural watershed improvements. He is a California licensed Professional Engineer and earned his bachelor’s degree in Civil and Environmental Engineering from UC Berkeley in 2017. He uses his technical background in fluvial geomorphology, topographic surveying, hydrologic analyses, hydraulic modelling, construction planset drafting to express his passions for holistic watershed rehabilitation, stakeholder communication, and innovative design methodologies alongside other experienced employees at PWA.
Mr. Flynn has been a Project Geologist at PWA for over 13 years. He has extensive experience in watershed-scale geologic and geomorphic analyses as they relate to land management throughout Northern California. His experience is primarily in road-related watershed analysis, geomorphology, hydrology, and geologic and geomorphic mapping. His additional expertise includes geologic and geomorphic investigations, sediment source inventories, erosion prevention planning and implementation, air-photo analysis, and project management.
Mr. Skeahan has a bachelor’s degree in Geology and over seven years of experience in watershed restoration, water quality protection, and geomorphic investigations, including watershed assessments, field surveying, water and soil sampling, technical report writing, and equipment oversight in the Northern California region. He currently specializes in regulatory compliance for rural landowners, including site investigations, regulatory monitoring and reporting, water rights, and development of water quality protection plans, restoration plans, regulatory permit applications, and erosion and sediment control measures. He also specializes in providing technical guidance and treatment recommendations for rural landowners in violation of state and county water quality, planning, and building regulations.
Ms. Robinson specializes in geologic and geomorphic mapping. She has a background in local geology and fluvial geomorphology, and has extensive experience in topographic surveying, stream assessments, sediment-source mapping, and watershed analysis. Ms. Robinson is also involved in project management, technical report development, restoration planning, water rights, and environmental land use permitting at the county and state levels.
Margo Moorhouse is a Fisheries Biologist/Aquatic Ecologist for PWA. She has a B.S. in Fisheries Biology with an emphasis on Freshwater Fishes and Ecology. She brings over 30 years of experience to PWA having worked for agencies and numerous private consultants conducting instream flow studies, population estimates, and habitat suitability criteria curve development throughout California, Oregon, Washington, and Idaho. Margo has extensive knowledge of aquatic ecosystem functions including the effects of habitat restoration activities on channel, aquatic ecology, and fish assemblages. She conducts habitat assessments, protocol level sampling, ESA and CEQA compliance, statistical analyses, and scientific reporting.
Mr. Moorhouse has a background in wildlife and fisheries biology and specializes in field-based projects. These include wildlife, fisheries, and habitat assessments and monitoring; instream and off-channel salmonid habitat improvement; as well as riparian vegetation planting. He has decades of experience conducting watershed-wide road-related erosion inventories and assessments, as well as heavy equipment oversight on various erosion control and fisheries habitat improvement projects. Patrick also enjoys mentoring and training younger staff members.
Mr. Herbst specializes in applied geomorphology and developing and implementing restoration and in-stream and off-channel fish habitat projects. His experience includes managing sediment source assessments, developing and implementing road related sediment reduction and erosion control projects for forestland road networks, surface and groundwater monitoring, and conducting geologic characterizations to support engineering design projects. Responsibilities include supervising all aspects of project work including permitting, budget development and tracking, field evaluations, geomorphic mapping, data analysis, proposal and report writing, and oversight of heavy equipment operations.
Mr. Flores is an up and coming geologist in the field of Watershed Science and Environmental Management. He has worked on projects involving road-related watershed analysis, soil testing for onsite wastewater treatment site evaluations, and soil remediation projects for landowners. He also specializes in North Coast Regional Water Quality Control Board and State Water Resources Control Board requirements for California Fish and Wildlife permitting. When he’s not putting together a site suitability or comprehensive 1600 report, Héctor is in the field of science education and Spanish translation and interpretation, providing the North Coast with more than five years of experience.
Mr. Marshall has a background in environmental engineering and a passion for healthy watersheds and ecosystems. He completed his degree in Environmental Resources Engineering at Humboldt State University (now Cal Poly Humboldt) in 2018 and has been working in consulting since then. He has experience performing in-stream channel assessments and developing habitat restoration designs. On the technical side, he is proficient in drafting, topographic surveying, and hydraulic modeling. Aside from his days behind a computer, his experience in construction management, oversight, and boots-on-the-ground operation helps to bridge the gap between ideas and implementation. Ben is committed to the improvement and rehabilitation of our local (and beyond) watersheds for happier ecosystems.
Tyler Cole has over five years of experience providing observation and testing services for construction projects throughout the North Bay area. He was heavily involved with fire rebuild processes, including soil compaction, special inspection, and concrete sampling, following the 2017 Tubbs Fire and 2020 Glass Fire. He also conducted subsurface exploration for geotechnical investigations, including soil sampling, soil classification, and lab testing for new residential and commercial development projects and landslide repairs. Since joining PWA in 2022, he has been conducting road and trail assessments for watershed restoration projects and performing field-based assessments and evaluations, as well as data collection, report compilation, site inspections, and site monitoring.
Mr. Cruz has a background in fisheries biology and anadromous fisheries monitoring. He has years of experience as a field biologist and researcher, where he has monitored salmonids in Big Sur and Northern California, studied wildfire ecology and disturbance in Northern California, and surveyed riparian ecosystems in post-fire forests in Western Oregon. At PWA, Edgar works on various projects, including in-stream and off-channel fish habitat restoration, fish removal and relocation, and fish habitat feature designs. He conducts field-based surveys and data analysis for salmonid habitat assessments, adult salmonid escapement, juvenile salmonid occupancy, and habitat utilization. He holds two bachelor's degrees from UC Santa Cruz—one in Environmental Studies and the other in Fine Arts. In his free time, Edgar enjoys creating visual art, rock climbing, and connecting with the natural world.
Mr. Weiser is an Environmental Engineer with a Bachelor’s Degree in Environmental Resources Engineering from Cal Poly Humboldt. He has experience in instream habitat restoration, stream geomorphology, and hydrology. Nick’s passions include fishing, foraging, birdwatching, and generally exploring the outdoors. He is excited to be improving the rivers and forests that nurture such experiences and activities in and around Humboldt County. At Pacific Watershed Associates, he is a project designer and drafter; assesses stream geomorphology and evolution; develops hydraulic models; aids in construction oversight, project implementation, and logistics; and gives lots of attention to the office dogs. Nick is committed to restoring local rivers and environments to conditions that nourish the landscape, wildlife, and people.
Samantha Lieburn is a staff scientist at PWA with a B.S. in Wildlife Biology and Conservation Management from Cal Poly Humboldt. She brings experience in collecting vertebrate species, monitoring and data collection, habitat restoration, community outreach, and scientific writing, with a particular interest in herpetofauna. In her current role, she collaborates with multidisciplinary teams to support watershed and habitat restoration projects, erosion mitigation efforts, and other environmental initiatives. Samantha is dedicated to watershed health and protecting wildlife and their habitats through effective conservation practices.
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.
Mr. Landowski has been a part of the PWA team since 2017. He repairs and maintains PWA’s fleet of vehicles so that staff can access the rugged terrain in which they conduct their field work. He has studied the automotive repair industry for the past 6 years and has a passion for fixing things. Mr. Landowski also works in the Accounting department where he handles all billing for the compliance division.
design & development: accelerant
