Sierra Geotechnical Services Inc. (SGSI) - Geotechnical Engineering, Environmental Engineering, Engineering Geology, Hydrogeology, Materials Testing and Construction Inspection


We like to think of ourselves as cleanliness challenged. But muddy or not, we have a high caliber team of well organized, technically skilled specialists. You can meet them here first so you don't have to wipe the dirt off after shaking thier hands. At least not yet.
	Thomas A. Platz
	(President/Principal Engineer)
	• California Professional Engineer No. C41039 • Nevada Professional Engineer No. 8288 • A.S.C.E., Advanced Integrated Wastewater Pond System Design • University of Wisconsin, Small Community Wastewater Treatment Design • University of Wisconsin, Water System Analysis Distribution • B.S., Civil Engineering, Cal State University Northridge, 1981
	Mr. Platz has over 25 years experience in geotechnical engi-neering specializing in foundation design, investigations for new residential and commercial developments, with a specialization in slope stability and waste water treatment facilities. In addition, his work includes extensive engineering analysis and support for military projects, cellular communication networks, hospitals, and golf courses.
	Joseph A. Adler
	(Principal Engineering Geologist)
	• California Professional Geologist No. 7017 • California Certified Engineering Geologist No. 2198 • Arizona Registered Geologist No. 37097 • Association of Engineering Geologists No. 6435 • M.S. San Diego State University, 2003 • B.A. University of California, San Diego, 1989
	Mr. Adler has over 14 years experience in engineering geology specializing in hillside mass grading and improvement projects including: single and multi-family residential, commercial sites, public school sites, municipal roadways, reservoir sites, soil nail walls, and fault and landslide hazard studies. In addition, his work includes extensive post-construction slope stability and landslide investigations for distressed residential and commercial structures in southern California and Nevada.
	Dean Dougherty
	(Principal Environmental Geologis)
	• California Professional Geologist No. 6497 • B.S., Geology, University of Southern California,1987 • Seismic Hazard Analysis, AEG Short Course, 1994 • Excavation Safety, OSHA 10-Hour Course, 1999
	Mr. Dougherty has over 18 years experience in environmental and engineering geology specializing in mass grading and improvement projects, fault and landslide hazard studies, Phase I and II environmental site assessments, groundwater investigations and water well design.
	Paul Stone
	(Principal/Lab Manager)
	• B.S., Geology, California State University Northridge, 1980 • ACI I - 71983 • Hazardous Waste Detection OSHA 40-Hour Course, 1987 • Nuclear Gauge Operation, 1990
	Mr. Stone has over 15 years experience in laboratory testing and engineering geology specializing in soil mechanics, concrete mix design, concrete sampling and field investigations.
	Paul Roten
	(Senior Engineer)
	• California Professional Engineer No. 56891 • A.S.C.E., Advanced Integrated Wastewater Pond System Design
	Mr. Roten has provided client and public agency coordination, project supervision, coordination, scheduling, and design for commercial, residential and public works projects including several school projects. His experience includes grading/drainage design, roadway, sewer and water projects, project permit processing, utility coordination and client liaison. He also has experience in hydrologic/hydraulic studies and the preparation of Waste Discharge Reports, Storm Water Pollution Prevention Plans and retaining wall design. He is proficient in AutoCAD Land Development Desktop.
	Ron Hastie
	(Special Inspector)
	• AWS/CWI - 99010261 • ACI I - 004095 • DSA Masonry - 2484 • ICC Fireproofing - 1129092-87 • ICC Structural Masonry - 1129092-84 • ICC Reinforced Concrete - 1129090-49 • ICC Structural Steel and Welding - 1129092-49 • UT Level II
	Mr. Hastie has over ten years of quality control and inspection related experience for both commerciat. residential and public works projects.
	Steve Hnat
	(Senior Staff Geologist)
	• B.S. Geology, University of Vermont, 2000
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	Brooke Mosley
	(Staff Engineer)
	• B.S Aerospace Engineering, University of California, San Diego, 2005
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	Mike McGrale
	(Senior Field Technican)
	• ACI I • Radiation Safety Officer, 2005
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