Posted by on January 02, 19101 at 01:43:52:
Donald W. Tubbs
7505 West Lake Sammamish Parkway NE
Redmond, Washington 98052
USA
Phone: (425) 882-4850
E-mail: dontubbs@tubbs.com
Experience
Donald W. Tubbs has over 25 years experience in engineering geology, applied geomorphology, geologic hazards evaluation,
surface water hydrology and groundwater hydrology. His 1975 Ph.D. dissertation on "Causes, Mechanisms and Prediction of
Landsliding in Seattle" was one of the earliest regional geologic hazards studies in western Washington. He has held faculty
positions at Michigan Technological University and at the University of Kansas, where he taught courses in hydrogeology,
environmental geology and engineering geology. Over the years he has been a speaker on these subjects at seminars presented
by professional organizatons and public agencies in the Pacific Northwest and also in the Philippines.
Dr. Tubbs has been the principal investigator and project manager for studies involving material resources, surface water and
groundwater hydrology, erosion and sediment transport rates, foundation and slope-stability problems, and landslide-hazards
mapping. His consulting experience includes mapping of geologic hazards for King and Snohomish Counties, and for the Cities of
Edmonds, Lake Forest Park, Redmond, Renton and Tukwila, together with numerous site-specific investigations for private
sector clients.
Representative Projects
Geologic Hazards Evaluation, Redmond, Washington, for City of Redmond. Studied landslide, erosion and seismic hazards, and
aquifer recharge within Redmond as a basis for the City's Sensitive Areas Ordinance. Developed criteria and compiled maps of
critical areas as required by the Growth Management Act.
Geologic Hazards Evaluation, Tukwila, WA for City of Tukwila. Project manager for a study of landslide, erosion and seismic
hazards within Tukwila to form the basis for the City's Sensitive Areas Ordinance. Provided information regarding the geographic
distribution of geologic hazard and resource lands areas and recommendations for geotechnical investigations and for
requirements relative to development in these areas.
Sensitive Areas Ordinance Review, Normandy Park, Washington for the City of Normandy Park. Reviewed the technical
elements of the SAO and its development standards, and provided recommendations for conceptual and language changes to
provide a stronger technical basis for the ordinance.
Geologic Hazards Evaluation, Snohomish County, Washington, for Snohomish County. Reviewed geologic conditions in proposed
urban growth areas within Snohomish County, developed criteria for identifying geologically hazardous areas, delineated those
areas on maps, and provided geotechnical recommendations for regulation of development within those areas.
Blakely Ridge UPD Project, King County, Washington, for Port Blakely Partnership. Geotechnical and hydrologic investigation
for the over 1,000-acre UPD (Urban Planned Development) project. The report provided the basis for the earth and water
portions of the Environmental Impact Statement and for project design. Subsequent work included evaluation of geologic hazards
along two stormwater discharge pipeline alignments between the site and the Snoqualmie River, and geologic input to the design
of retaining walls for off-site, project-related road improvements.
Northridge UPD Project, King County, Washington, for Quadrant Corporation. Geotechnical and hydrologic investigation of a
1,500-acre UPD site, including identification of geologically hazardous and aquifer recharge areas, evaluation of the potential
impacts of site development and recommendations for mitigation of those impacts. The results of the investigation were
incorporated into the Environmental Impact Statement for the project.
Geologic and Hydrogeologic Evaluation, MPD Site, for Grand Ridge Partners. This EIS study included airphoto interpretation and
surface reconnaissance of the 2200-acre Grand Ridge MPD (Master Plan Development) site to evaluate geologic hazards,
including coal mine, landslide, erosion and seismic hazards. Analysis included evaluation of geomorphological processes relevant
to site planning, including downstream impacts on stream systems, and water budget analysis of potential changes in surface
water runoff and groundwater recharge resulting from the development.
Evaluation of Landslide Hazards, Seattle, Washington, for the Bayshore, Sonata and Alki Condominium Associations. Included
review of existing information, field reconnaissance of landsliding in the 1500 block of Alki Avenue Southwest and preliminary
evaluation of possible options for mitigation. Our findings were presented at a meeting of the condominium owners and residents
and our conclusions and recommendations were summarized in a written report.
Meadowdale Landslide Complex, Edmonds, Washington, for City of Edmonds. An investigation of a large landslide complex to
evaluate the effect of construction of storm and sanitary sewers on the hydrology and stability of the landslide.
Landslide Hazards Evaluation, King County, Washington, for Schrod-Mar, Inc. Surface and subsurface investigation relative to
proposed expansion of a gravel mine near the community of Kanasket. The surface mining operation near the toe of an ancient
landslide complex. The primary issues involved possible effects of the proposed expansion on groundwater supplies and on the
stability of the landslide. Services included surface reconnaissance, subsurface exploration and recommendations for a monitoring
program and mitigation plan.
Gibraltar Road Landslide, Fidalgo Island, Washington, for Skagit County. Investigated a large landslide involving some 30 homes
and a county road to evaluate the causes of the landslide and to develop recommendations for possible mitigation.
Hydrogeologic Services, Fidalgo Island, for Skagit county. Reviewed available geologic and hydrogeologic information regarding
proposed development sites and adjacent areas. Performed water budget analysis to evaluate potential impacts to the stability of
the nearby bluffs and to the water quantity and quality of the community water system. Provided recommendations to mitigate
potential problems from water runoff and on-site infiltration.
Hydrogeologic Drainage Basin Study, King County, Washington, for King County. This geotechnical evaluation of the McAleer
Creek drainage basin was performed in conjunction with an overall hydrologic study of the basin by Kramer Chin and Mayo.
Services included identifying the character and distribution of soils and classification of those materials relative to rates of runoff
and infiltration, erosion problems, water quality and slope stability.
Sediment Transport Study, Coal Creek drainage basin, King County, Washington, for the City of Bellevue. Evaluated sediment
sources, transportation and deposition within the Coal Creek watershed, in conjunction with a hydraulic analysis within the delta
area by Northwest Hydraulics. The purposes of the study were to provide a basis for responding to local flooding that has
occurred within the delta area as a result of deposition within the stream channel, and to evaluate the relative effectiveness of
several proposed dredging options.
Evaluation of the effects of changes in flow regime on sediment transport in the White River downstream of Mud Mountain
Dam, for Puget Sound Power & Light Company.
Investigation of potential stream erosion and sedimentation at proposed pipeline crossings of numerous streams in Washington
State, for the Northern Tier Pipeline Company.
Evaluation of sediment transport and deposition from construction of open trench pipeline river crossings, for the City of Tacoma.
Employment History
1994 - present
Principal, Tubbs Geosciences (Redmond WA)
1980 - 1997
Senior and Associate, GeoEngineers (Redmond WA)
1978 - 1980
Senior Geologist, Roger Lowe Associates (Bellevue WA)
1976 - 1978
Assistant Professor, Dept. of Geology, Univ. of Kansas (Lawrence KS)
1975 - 1976
Visiting Assistant Professor, Dept. of Geology and Geological Engineering, Michigan Tech. Univ.
(Houghton MI)
Education
Ph.D., Geological Sciences, University of Washington, 1975
M.S., Geological Sciences, University of Washington, 1971
B.S., Geology, University of Puget Sound, 1969
Affiliations
Geological Society of America
Association of Engineering Geologists
Registration
Registered Geologist (Certification in Engineering Geology), Oregon
Publications
(with Clevenger, W.R. and Lindsay, C.S.), 1998, Estimating Changes in Water and Sediment Budgets for Developing
Watersheds: a Case Study in Program with Abstracts, 41st Annual Meeting, Association of Engineering Geologists
(with Curran, J. H. and Watkins, M.D.), 1994, Application of the Universal Soil Loss Equation in Estimating Relative Sediment
Yields Associated with Urbanization in Abstracts with Programs, 1994 Annual Meeting, Geological Society of America
(with Koloski, J. W., and Schwarz, S.D.), 1989, Geotechnical Properties of Geologic Materials in Engineering Geology in
Washington, Richard W. Galster, Editor: Washington Division of Geology and Earth Resources Bulletin 78
(with Dunne, Thomas, et al.), 1981, Geologic and Geomorphic Implications for Gravel Supply in Proceedings of the Salmon
Spawning Conference, John J. Cassidy, editor: Washington Water Research Center
(with Fulmer, C. V., et al.), 1978, Sensitive Areas Map Folio: King County Department of Planning and Community Development
(with Dunne, Thomas), 1977, Geologic Hazards in Seattle: Geologic Society of America Field Guide
1974, Landslides in Seattle: Washington Division of Geology and Earth Resources Information Circular 52
1974, Landslides and associated damage during early 1972 in part of west-central King County, Washington: U. S. Geological
Survey Miscellaneous Geological Investigations Map I-852B