Investigation, Inspection and Testing
Questa performs a variety of engineering geological and geotechnical services, frequently related to property development, property transactions, and property rehabilitation. California is an extremely active geological environment, susceptible to earthquakes, floods, landslides, volcanism, adverse soil and bedrock conditions, and seismic sea waves. Questa’s team of geo-professionals understands these hazards and the sites that are prone to them. Trained and educated in Northern and Central California, our team has a strong background in hazard investigation and design measures to reduce the susceptibility of engineered structures to failure.
Geotechnical Investigations and Studies
- Public Works Projects
- Wastewater Treatment Plants
- Transportation Projects
- Roadway Improvement and Rehabilitation
- Trails and Pedestrian Bridges
- Park Improvements
- Parking Structure Projects
- Pipeline Improvement and Rehabilitation
- Streetscape Projects
- Retaining Structure Investigation & Design
- Landfill Closure and Reuse
- Residential Properties
- Single Family
- Minor/Major Developments
- Multi-family
- Commercial/Industrial Properties
- Office/Research Facilities
- Manufacturing Facilities
- Retail Stores
Engineering Geologic Investigations and Studies
- Geological Feasibility Studies
- Geological Hazards Studies
- Slope / Stream Bank Stability Investigation & Analysis
- Active fault studies
- Liquefaction studies
- Seismic stability investigation
- Consolidation and settlement studies
- Subsurface drainage gallery design
Geologic Planning Services
- Initial studies
- Mitigated negative declaration
- Geologic feasibility studies
- Environmental Impact Reports
- Mitigation and monitoring plans
Hazardous Materials Investigation, Remediation, and Management
- Waste containment facilities
- Site stabilization and runoff control
- Pollutant migration investigations
- Aquifer protection and mitigation measures
- Waste treatment technology
- Monitoring programs
- Site closures
- Phase I environmental site assessments
- Phase II site investigations
- Preliminary endangerment assessments
- Remedial design plans
- Site remediation construction and management
Geotechnical Construction Management, Inspection and Testing Services
- Geotechnical Construction Management
- Construction Management for Foundation Construction Activities
- Construction Management for Grading Projects, including major cut slopes and fill embankments
- Construction Management for Trails and Pedestrian Bridges
- Construction Quality Assurance Inspection, Observations and Testing
- Driven and Drilled Displacement Piles
- Drilled Piers
- Soil and Rock Cut Slopes
- Engineered Fill – Field Density/Compaction Testing with the Nuclear Gauge
- Excavated Footings
- Retaining Wall Installation
- Subsurface Drainage Measures
- Surface Drainage Measures
- Driven and Drilled Displacement Piles
- Laboratory Testing
- Gradation of Materials per Caltrans Standards
- Soil Textural Analysis by Sieve and Hydrometer
- Particle size analysis
- Atterberg Limits Testing, Including Liquid Limit, Plastic Limit and Shrinkage Limit
- Compaction: moisture-density curves
- Strength testing