Sigma Prime Geosciences, Inc., is a geologic and civil engineering consulting firm. Based in Half Moon Bay, California, Sigma Prime is dedicated to meeting its clients needs in a timely, effective manner.

forensic engineering We provide litigation work and expert testimony in projects involving geotechnical failures such as foundation distress, slope instability, drainage problems and construction defects.

general geotechnical services We perform subsurface and laboratory studies for a wide range of structures, including buildings, tunnels, and dams.

surveying State-of-the-art equipment helps us generate accurate site maps.

slope stability We assess slopes, levees, embankment dams and engineered slopes as well as analyze and design repair of existing landslides.

fault studies and geologic mapping Evaluation of location and level of seismicity of faults and mapping of geologic features pertinent to individual projects.

liquefaction analyses We perform field studies and quantitative analyses to assess the potential for liquefaction at existing or proposed construction sites.

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332 princeton avenue

half moon bay, ca 94019


650 728-3590 telephone

650 728-3593 fax


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charles kissick

principal civil engineer

charles kissick brings over 25 years’ experience in engineering geology, geotechnical engineering, environmental geology, hydrology and project management experience to major projects throughout the bay area and california, including the devil’s slide feasibility study. he also performs seismic hazard evaluations including liquefaction analyses and seismic slope stability.

abbie goldstein

principal geologist

with over 20 years’ technical analysis and project management experience, abbie goldstein has led clients, staff and subcontractors from proposal to realization of environmental and engineering projects of all scales. he specializes in the assessment and management of sediment, soil, surface water and groundwater contamination at private, commerical and industrial sites.