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Corey Dare, GE, PE
Managing Principal

Mr. Dare joined Geosphere in 2012 and has over 30 years of professional experience as a geotechnical engineer in the San Francisco Bay Area and Northern California. With a Masters in Engineering from UC Berkeley and over 15 years of specialty experience in geotechnical construction and materials testing, he has served as a construction and materials testing group manager at various companies.  Mr. Dare specializes in the local and regional geotechnical practice, and has served local and regional government clients such as cities and counties as well as transportation, water and wastewater agencies; educational and healthcare institutions; industrial clients, and commercial and residential developers. He has extensive experience managing projects involving California Division of State Architect (DSA) or Office of Statewide Health Planning and Development (OSHPD) oversight.  His engineering expertise includes site investigations, shallow and deep foundations, settlement and slope stability evaluation, retaining wall design, soil improvement methods, and pavement design.  Mr. Dare has also served as a geotechnical peer reviewer for a number of Northern California cities and counties.

Marlene K. Jackson, CE, GE
Principal Geotechnical Engineer

Ms. Jackson joined Geosphere in 2017 and has been providing geotechnical engineering services in the San Francisco Bay Area for over 30 years. With a Bachelor’s degree from Harvard University in Geologic Science and a Master’s degree in Geotechnical Engineering from UC Berkeley, her background in geology, earth science, and geotechnical engineering provide a relatively unique combination of study that facilitates recognition of the relationships between subsurface materials and their engineering characteristics. Ms. Jackson has been responsible for business development and management of geotechnical engineering services including completion of geotechnical investigations, soil sampling and laboratory analyses, engineering analyses, preparation of geotechnical recommendations and design criteria, report preparation, plan review, construction observation and testing services, and expert witness services as well as other geotechnical engineering related consultation. She has provide geotechnical engineering consultation for a wide variety of projects including schools, medical facilities, fire stations, commercial construction, retail facilities, mixed-use developments, and residential structures. Ms. Jackson has experience performing engineering analyses for design of both deep and shallow foundations systems, restrained and un-restrained retaining walls, underground utilities and structures, flexible pavement, reinforced earth embankments, static and dynamic settlement, bearing capacity, resistance to lateral loads, lateral earth pressures, static and pseudo-static slope stability, liquefaction evaluation, post-tensioned slab, and effects of surcharge loads. Ms. Jackson has worked on projects which included complex slope stability issues involving existing residences on actively moving landslides, shoreline and levee stability, and emergency landslide repair.

Joel E. Baldwin, II PG, CEG
Principal Engineering Geologist

Mr. Baldwin joined Geosphere Consultants in 2017, and is a Certified Engineering Geologist (CEG) with more than 40 years of experience in the geotechnical consulting profession. During his career, he has provided engineering geologic site characterization and evaluation for commercial, residential, public and private schools as well as infrastructure improvements in both Southern and Northern California. His specialties include residential and commercial hillside and marginal land developments, nuclear power plants and dams, landslide characterization and mitigation, bluff and channel bank erosion and mitigation, and post-disaster geologic hazard characterization. Mr. Baldwin has served as Jurisdictional Peer Reviewer for the Cities of Pacifica, Belmont and Millbrae and has provided plan review and course of construction observation for conformance with design-level geotechnical report recommendations. He is an expert in cliff erosion in areas such as the City of Pacifica. Mr. Baldwin is very active in the Bay Area engineering community where has participated in many technical and trade organizations, including the American Society of Civil Engineers, Association of Engineering Geologists, Geological Society of America and the California Board of Registration for Geologists and Geophysicists. In his spare time, he is an accomplished surfer and has participated in many competitions.

Terese Salas
Marketing Manager

Ms. Salas joined Geosphere Consultants in 2016. Before joining Geosphere, Ms. Salas was a marketing and corporate communications consultant for various AEC firms in the Bay Area. She brings over 15 years of experience and proven track record of successful marketing and corporate communications campaigns. Ms. Salas is an active member of SMPS and volunteers her time providing marketing and graphic design services for local community groups.

Alex Lim, PE, QSP
Project Engineer

Mr. Lim joined Geosphere Consultants in 2015 and graduated from Cal Poly, San Luis Obispo with a Master's Degree in Civil Engineering with a Geotechnical Engineering specialization. As Project Engineer, Mr. Lim is responsible for performing geotechnical investigations and management of construction phase geotechnical services for various projects, as well as assisting as needed in performing geotechnical foundation installation and ground improvement observation, onsite geotechnical consultations, inclinometer installation and monitoring, borings and CPTs, nuclear gauge testing, and soil, water and analytical sampling. He has worked on projects involving the development of schools, medical facilities, commercial and retail developments, roadways and pavements, and government facilities throughout the greater Bay Area and Northern California. Mr. Lim is also a Qualified SWPPP Practitioner (QSP).

Nicholas Anastasio
Staff Engineer

Mr. Anastasio joined the Geosphere team in May of 2014. As a graduate of Cal Poly, San Luis Obispo’s Civil Engineering program with a focus in Geotechnical Engineering, he uses his knowledge gained in the classroom as well as the field to assist the team with site investigations, project analysis, and drafting. He is currently an Engineer-In-Training, and is working towards becoming a Professional Engineer. So far, he has experience providing construction observation for footings, pile driving, and drilled piers, in addition to performing nuclear-gauge compaction testing and coordinating analytical testing of soil.

Virgil Tenoso
Staff Engineer

Mr. Tenoso joined the Geosphere Consultants team in 2017 and graduated from California State University Sacramento with a Bachelor's degree in Civil Engineering. Virgil has been key in supporting the geotechnical staff with nuclear gauge testing, concrete sampling, laboratory testing, construction observations and testing, and assisting in engineering investigations, including field investigations (borings and CPTs).

Joey Li
Laboratory Supervisor/Field Engineer

Mr. Li joined Geosphere Consultants in 2017, and functions as Geosphere's Oakland geotechnical laboratory supervisor, as well as in-house field exploration engineer and construction-phase field engineer. Joey graduated with a Bachelor's degree in Civil Engineering from CSU San Jose, and has over27 years of experience in the geotechnical and related professions. Joey is proficient in performing geotechnical laboratory testing, foundation installation observation for piers, piles, footings and tiebacks, nuclear density testing, and geotechnical engineering assistance for our geotechnical projects.