DAC Associates is a local small business (SBE) consulting firm founded by Darius Abolhassani who has over 30 years of experience in engineering. DAC provides a full range of geotechnical, structural, and civil engineering services including construction support, special inspection, and materials testing.. Geotechnical Investigation and Report Foundation Engineering Slope Stability Analysis Geologic Hazard Evaluation Liquefaction Studies Fault Investigation Pavement analysis & Design Embankment Design Dam Engineering Soil Stabilization Structural Engineering & Design Wood-frame Structures Concrete Structures Steel Structures Residential,Commercial,and Industrial Structures Mixed use Facilities Value Engineering Grading & Drainage Design and Plans Cut-and-Fill Calculations Hydrological and Flood Calculations Stormwater Pollution Prevention Plans (SWPPP) Geotechnical Observation and Testing Structural Observation and testing Temporary shoring Design and Observation Wet weather Construction Observation Construction Troubleshooting Instrumentation and performance monitoring