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Geotechnical Team


David R. Gius Jr., MS, PE, GE, PG, CEG

President and Principal Engineer

Mr. Gius has over 30 years of experience as a project engineer, dating to his entry into the fields of geotechnical engineering and engineering geology in 1985. His extensive track record includes geotechnical and geologic studies for schools, hospitals, fire stations, commercial and industrial projects, and residential subdivisions. Mr. Gius has performed numerous site-specific ground response studies for earthquake analyses of structures, as well as forensic analyses of distressed structures throughout the Sacramento Valley.

Mr. Gius received his Bachelor of Science degree in Geology and Master of Science degree in Civil Engineering from San Jose State University. His studies concentrated on the fields of engineering geology, geotechnical engineering and open-channel hydraulics. He is a California registered Civil Engineer, registered Geotechnial Engineer, Professional Geologist and a Certified Engineering Geologist. Mr. Gius is a member of the American Society of Civil Engineers, the Association of Engineering Geologists, the Earthquake Engineering Research Institute and the Structural Engineers Association of Central California, and is past President of the California Geotechnical Engineering Association – CalGeo (1999–2000). Mr. Gius is a proud member and Past President (2015-2016) of the Rotary Club of West Sacramento, Centennial. 

Professional Registrations

Civil Engineer CE 49098
Geotechnial Engineer GE 2318 
Professional Geologist PG 5272
Certified Engineering Geologist CEG 1681






Michael M. Watari, MS, PE, GE

Senior Engineer and Manager of Geotechnical Engineering

Mr. Watari has worked on geotechnical and environmental projects throughout California since 1993. His extensive project experience includes studies for railroad and transportation corridors, tunnels, schools, high-rise office developments, and residential developments, as well as infrastructure improvements including bridges, thermal energy storage tanks, regional pipelines, and wastewater treatment plants. He has extensive experience using a variety of exploration techniques including cone penetrometer tests, mud-rotary, rock coring, resonant sonic coring, excavation test pits, and geophysical testing.

Mr. Watari received his Bachelor of Science degree in Civil Engineering from California State University, Fresno, and a Master of Science degree in Civil Engineering from California State University, Sacramento. He is a registered Geotechnical Engineer in the state of California and a registered Civil Engineer in the state of California and Nevada. He is a member of the California Geotechnical Engineers Association, the American Society of Civil Engineers, and the Structural Engineers Association of California.



EDWARD MAK, PE, GE

SENIOR ENGINEER

Mr. Mak has over 37 years of experience in geotechnical engineering. He has experience in coordinating and conducting site subsurface exploration, geotechnical engineering analysis, foundation design, construction observation, field and laboratory testing, geologic hazards evaluation, seismic ground motion and hazard study, on a wide range of projects. His project experience included geotechnical engineering for structures such as dams, levees, water gates, retaining walls, hospitals, medical office buildings, parking structures, residential subdivisions, police stations, school buildings, highways, bridges, airport terminals, and commercial buildings.

Mr. Mak obtained his Bachelor of Science degree in Civil Engineering from the University of Wisconsin - Platteville and Master of Engineering degree in Geotechnical Engineering from the University of Wisconsin - Milwaukee. He is a registered Civil Engineer and a registered Geotechnical Engineer in the State of California.



Mauricio Luna, PE

Project Engineer

Since entering the field of geotechnical engineering in 2006, Mr. Luna has worked on various types of projects including levees, underground pipelines, bridges, waste water treatment plants, water tanks, railroads, schools, hospitals, residential, commercial and retail development, and roadway construction projects. Mr. Luna has been involved in all aspects of projects including writing proposals, planning and supervising field investigations, interpreting field and laboratory testing results, engineering analysis, final geotechnical report preparation, and plan review. He has also provided construction oversight during the installation of slurry walls, tie-back anchors, deep foundations (driven piles, auger-cast-in-place piles, etc.), and earthwork operations. 

Mr. Luna received his Bachelor of Science degree in Civil Engineering from California State University, Sacramento. He is registered in California as a Civil Engineer and is actively involved with the American Society of Civil Engineers, Sacramento Section, serving as Capital Branch Secretary from 2013-2014.



TOM DESIMONE, P.G.

PROJECT GEOLOGIST

Mr. DeSimone is an experienced geologist with 10 years in the geotechnical industry, including a broad range of experience on public and private projects. His experience includes project management while leading and performing geotechnical and geological evaluations. Projects have included new school and community college construction, development (residential, commercial, and retail), solar array structures, and consultation for quarry projects. In addition to his participation in Geotechnical Evaluation and Geologic Hazard work, he has lead and participated in a number of geological evaluations and fault studies for proposed school and community college projects. Mr. DeSimone’s services include writing proposals, planning and supervising field investigations, interpreting field and laboratory testing results, engineering analysis, final geotechnical report preparation and plan review. He has also provided project management and construction oversight during the installation of tie-back anchors, soil nails, ground improvements, deep foundations (micropiles, cast-in-place piles and belled caissons, etc.) and earthwork operations.

Mr. DeSimone obtained his Bachelor of Science degree in Geology from San Jose State University. Mr. DeSimone is a registered Professional Geologist in the State of California, and a member of the Sacramento Chapter of the Association of Engineering and Environmental Geologists (AEG).



JOSEPH R. YBARRA

STAFF GEOLOGIST

Mr. Ybarra graduated Magna Cum Laude from California State University, Sacramento with a Bachelor of Science degree in Geology.  Mr. Ybarra’s experience covers many facets here at Wallace-Kuhl & Associates with years as a Field Technician in construction materials testing in soils, field work on the Environmental team collecting and analyzing field data, and working on the Geotechnical Engineering team primarily.  On the Geotechnical Engineering team Mr. Ybarra has been involved in all aspects of projects including planning and supervising field studies, interpreting field and laboratory testing results and data, engineering analysis, and geotechnical report preparation.



Derek Bays

Staff Geologist

Mr. Bays graduated from California State University, Sacramento with a Bachelor of Science degree in Geology.  His previous professional experience includes fieldwork in earthwork, construction materials testing and environmental testing for schools, hospitals and multi-family developments in the San Francisco Bay area and throughout the Sacramento region.  As part of the Wallace-Kuhl team, Mr. Bays is dual-faceted with environmental and geotechnical experience having conducted subsurface investigations, performed engineering analyses of field and laboratory data and prepared geotechnical reports as part of his engineering studies.



JESUS LOPEZ, EIT

STAFF ENGINEER
Mr. Lopez earned his Bachelors of Science degree in Civil Engineering from California State University, Sacramento. From his education, Mr. Lopez became knowledgeable in soil and rock mechanics and has a fundamental understanding of the geologic features that influence the design, construction, and maintenance of engineering projects. During his time at CSU, Sacramento, Mr. Lopez held a 1-year officer position for the American Society of Civil Engineers student chapter and also maintained active membership in other student organizations such as Society of Hispanic Engineers, Steel Bridge, and Structural Engineers Association of Central California. His professional experience in the civil engineering industry consists of two years as an intern, where he performed various engineering sewer studies and evaluations, established and maintained project schedules, provided preliminary design & analysis to convert communities from septic systems to public sewer, prepared preliminary and alternative cost estimates for septic system conversion projects, and much more. As part of the Wallace-Kuhl team, Mr. Lopez is involved with all phases of geotechnical engineering investigations, analyses, and reports. Currently, Mr. Lopez maintains active professional affiliations with ASCE, CalGEO, GBA, and SEAOCC.