Cornerstone Earth Group, Inc.

Provides identification, assessment, and remediation of subsurface contamination to support real estate transactions and site redevelopment.

• Phase I Environmental Site Assessments
• Preliminary Endangerment Assessments
• Phase II Soil, Soil Vapor, and Groundwater Quality Investigations
• Soil Profiling for Import and/or Export
• Soil Vapor Intrusion Evaluations
• Indoor Air Monitoring
• Vapor Mitigation Design
• Contaminant Fate and Transport Modeling
• Aquifer Pump Tests
• Well Design and Installation
• Geophysical Surveys
• Human Health Risk Assessments
• Remediation Design and Implementation
• Soil Management Plans
• Dust Monitoring during Construction

Delivers comprehensive foundation design, seismic hazard analysis, and slope stability evaluations to guide safe and cost-effective structural development.

• Foundation Investigations
• Site Selection / Due Diligence Investigations
• Geologic Hazards Clearance
• Earthquake Engineering and Seismic Evaluations
• Liquefaction Analysis
• Slope Stability and Seismic Hazard Analysis
• Pavement Design, Evaluation, and Repair
• Excavation Shoring / Dewatering Consultation
• Utility Installation / Microtunneling Recommendations
• Retaining Wall Recommendations
• Levee Design, Evaluation, and Review
• Sustainable Design Input

Specializes in the design, construction quality assurance, and long-term monitoring of engineering barriers that block subsurface chemical vapors from entering indoor spaces.

• Vapor Intrusion Pathway Assessment
• Site-Wide Vapor Mitigation Strategy
• Vapor Mitigation System Design (Drawings and Specifications)
• Methane Mitigation Fan Sizing
• Construction QA/QC
• Remote Real-Time Monitoring
• Air Permitting with Local Air Districts
• Long-Term Operation, Maintenance, and Monitoring

Performs field inspections, earthwork testing, and foundation installation observation to verify compliance with project plans and regulatory codes.

• Foundation Observation
• Earthwork Observation and Testing
• Erosion Control Assessment
• Utility Trench Backfill Testing
• Pavement Testing
• Retaining Wall Backfill Testing
• Driven Pile and Drilled Pier Observation
• Ground Improvement Observation
• Slope / Landslide Mitigation
• Soil Stabilization / Chemical Treatment
• Piezometer and Inclinometer Installation and Monitoring
• Floor Level Surveys

Deploys unmanned aerial vehicles to capture high-precision topographic data, map site grading progress, and document environmental remediation milestones.

• Aerial Imagery Data Capture and Analysis
• 3D Modeling and Cross-Sectional Profiling
• Visual Site Reconnaissance
• Geospatial Site Map Overlay
• Undocumented Fill Mapping
• Construction Site Monitoring and Progression Mapping
• Geologic Hazard Mapping
• Pavement Distress Survey
• Environmental Remediation Documentation

Conducts physical testing of soil samples in an accredited facility to determine classification, consolidation, and engineering properties.

• Soil Classification
• Moisture Content and Density Testing
• Sieve Analyses
• One-Dimensional Consolidation
• Plastic Index (Atterberg Limit)
• Compaction Curves
• Lime Stability
• Soil Corrosion Screening