T HOMAS H. L EROY
A S SO CI A T E G EO LO G I ST
S P EC I A LI Z AT I O N : Applied geomorphology, geological field studies, Quaternary stratigraphy,
fluvial processes, erosion control, watershed restoration, project management
Q U A LI F I C AT I O N S :
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
S U MM A RY
O F E X P ER I EN C E :
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.
PACIFIC WATERSHED ASSOCIATES INC.
PO Box 4433 • Arcata, CA 95518-4433
(707) 839-5130 • www.pacificwatershed.com
THOMAS H. LEROY
Associate Geologist
page 1
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
PACIFIC WATERSHED ASSOCIATES INC.
PO Box 4433 • Arcata, CA 95518-4433
(707) 839-5130 • www.pacificwatershed.com
THOMAS H. LEROY
Associate Geologist
page 2
E X P ER I E N C E — C O N T .
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.
P UB LI C AT I O N S & P R ES EN T A T I O N S :
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 29May 1, 2005. Available from:
http://gsa.confex.com/gsa/2005CD/finalprogram/abstract_85765.htm
••••••••••
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.
PO Box 4433 • Arcata, CA 95518-4433
(707) 839-5130 • www.pacificwatershed.com
THOMAS H. LEROY
Associate Geologist
page 3
PACIFIC WATERSHED ASSOCIATES INC.
PO Box 4433 • Arcata, CA 95518-4433
(707) 839-5130 • www.pacificwatershed.com
THOMAS H. LEROY
Associate Geologist
page 4