t homas h. leroy associate geologist specialization: applied geomorphology, geological field studies, quaternary stratigraphy, flu
T homas H. Leroy
Associate Geologist
Specialization: Applied geomorphology, geological field studies,
Quaternary stratigraphy, fluvial processes, erosion control, watershed
restoration, project management
qualifications:
Associate Geologist / Project Geologist, Pacific Watershed Associates
Inc., 1999-present
Research /Teaching Assistant, Humboldt State University, 1994-1998
Geologist, U.S. Geological Survey Regional Field Mapping Team, 1994
M.S, Geology, Humboldt State University, 1998
B.S., Geology, Humboldt State University, 1994
California Registered Geologist #7751
Caltrans Storm Water Pollution Prevention Plan (SWPPP) certification,
2005
USGS/NAGT award for outstanding performance in field geology, Humboldt
State University, 1994
Co-editor, Humboldt Friends of Geology Field Guidebook, 2005
Co-editor, Friends of the Pleistocene Field Guidebook, 2006
Member, Redwood Coast Tsunami Working Group, 2002-present
Summary of Experience:
Tom Leroy has been an Associate Geologist and Project Leader for PWA
since 2000. He brings to the position extensive training in geologic
field methods, especially as they relate to erosion and sedimentation
processes on hillslopes and in stream channels. As Project Leader, he
is responsible for complete project management including proposal
writing, budget preparation, field data collection and mapping, field
crew supervision, data analysis, GIS map preparation, and reporting.
His work experience since joining PWA has emphasized applied erosion
investigations leading to the development of erosion control and
erosion prevention plans for federal, state and private landowners.
Mr. Leroy’s professional experience includes successfully completing
sediment source assessments in watersheds across Northern California.
He is skilled in all aspects of sediment budget analyses from air
photo analysis of land use and mass wasting to field surveys of
fluvial erosion, stream channel surveys, and analyses of surface
processes. He is a specialist in erosion processes and erosion control
planning for road systems, including both paved county roads and
unsurfaced forest and ranch roads. Past project experience includes
coordinating road related erosion assessments for the five Northern
California Counties (Del Norte, Trinity, Siskiyou, Humboldt and
Mendocino), covering thousands of miles of county roads.
Responsibilities for this project included providing technical
training and oversight to county crews conducting the inventory,
managing the data collection, and working with county Public Works
Departments to help them develop plans for implementing the prescribed
erosion control treatments. He has also been Project Leader for
multiple large assessments of rural subdivision lands in Sonoma
County, working with PWA field crews to complete the assessments and
erosion inventories, and develop remediation plans aimed at reducing
erosion and protecting fish habitat in these important watersheds.
Further professional experience includes Project Leader for erosion
assessments and sediment reduction implementation projects in the Van
Duzen River and Yager Creek watersheds at the request of the Yager and
Van Duzen Environmental Stewards (YES) group. Initiated in 2001, Mr.
Leroy has been instrumental in facilitating successful collaborations
among the local ranching community, the California Department of Fish
and Game, and the Regional Water Quality Control
Experience—cont.
Board. The project included assessing and developing a prioritized
implementation plan for more than 420
miles of ranch road, and has culminated in multi-phase implementation
and restoration efforts leading to reduced road related erosion and
sediment delivery, improved water quality, and lower long-term road
maintenance costs for private landowners in the watersheds.
Publications & Presentations:
Leroy, T.H., and Oswald, J.A., 2007, Deformed fluvial terraces at Root
Creek: implications for deformation along the southeastern extent of
the Little Salmon Fault Zone [abs.]: Geological Society of America,
Cordilleran Section Annual Meeting, 103rd, Bellingham, WA, May 4-6,
2007.
Leroy, T.H., and Patton, J., eds., 2005, Stratigraphic evidence of
paleoearthquakes and paleotsunami in mid to late Holocene sediments,
Humboldt Bay and lower Eel River valley, southern Cascadia subduction
zone: Humboldt Friends of Geology Field Guidebook.
Leroy, T.H., Lew, W.R., Kraemer, T.W., Taylor, C., Herbst, C., and
Weaver, W.E., 2004, Armored fill crossings: an alternative to
culverted stream crossings [abs.], in Stolzman, D., coordinator, 22nd
Annual Salmonid Restoration Conference, Davis, CA, March 2004: Redway,
CA, Salmonid Restoration Federation. Available from:
http://www.calsalmon.org
Leroy, T.H., Weaver, W.E., and Hagans, D.K., 2002, Coastal sand dune
stratigraphy of the north spit of Humboldt Bay, Northern California
[abs.]: Geological Society of America, Cordilleran Section Annual
Meeting, 98th, Corvallis, OR, May 13-15, 2002.
Leroy, T.H., Weaver, W.E., Hagans, D.K., and Foster, M.A., 2007,
Stream crossing decommissioning: common mistakes and how to avoid
them: conclusions based on the PWA/CDFG report: evaluation of road
decommissioning, CDFG Fisheries Resoration Grant Program, 1998 to 2003
[abs.], in Stolzman, D., coordinator, 25th Annual Salmonid Restoration
Conference, Santa Rosa, CA, March 2007: Redway, CA, Salmonid
Restoration Federation. Available from: http://www.calsalmon.org
Leroy, T.H., Weaver, W.E., Weppner, E.M., and Kraemer, T.W., 2005,
Evaluation of stream crossing decommissioning techniques and
effectiveness for a regional watershed restoration program [abs.],
Geological Society of America, Cordilleran Section Annual Meeting,
101st, San Jose, CA, April 29-May 1, 2005. Available from:
http://gsa.confex.com/gsa/2005CD/finalprogram/abstract_85765.htm
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Hagans, D.K., Weaver, W.E., Leroy, T.H., and Letton, B., 2006,
“Stealth sediment”: reducing hydrologic connectivity and fine sediment
delivery from roads, an essential component to improving habitat for
Central Coast steelhead [abs.], in Stolzman, D., coordinator, 24th
Annual Salmonid Restoration Conference, Santa Barbara, CA, February
2006: Redway, CA, Salmonid Restoration Federation. Available from:
http://www.calsalmon.org/pdf/SRF_Proceedings_06.pdf
Hemphill-Haley, M.A., Leroy, T.H., Patton, J., McPherson, R.,
Sutherland, D., Stallman, J., and Williams, T., eds., 2006, Signatures
of Quaternary crustal deformation and landscape evolution in the
Mendocino deformation zone, NW California: 2006 Friends of the
Pleistocene Field Guidebook.
Lew, W.R, Leroy, T.H., Weaver, W.E., and Hagans, D.K., 2006, Practical
lessons from 25 years of watershed restoration in Northern California
[abs.], in Stolzman, D., coordinator, 24th Annual Salmonid Restoration
Conference, Santa Barbara, CA, February 2006: Redway, CA, Salmonid
Restoration Federation. Available from:
http://www.calsalmon.org/pdf/SRF_Proceedings_06.pdf
Pacific Watershed Associates Inc. Thomas H. Leroy
PO Box 4433 • Arcata, CA 95518-4433 Associate Geologist
(707) 839-5130 • www.pacificwatershed.com page 1