Group Delta offers a comprehensive suite of environmental services designed to support clients throughout the entire project lifecycle—from initial due diligence to remediation and regulatory compliance. Their services are structured to address the specific needs of each project, ensuring timely delivery and adherence to environmental standards.
Due Diligence: Group Delta conducts Phase I Environmental Site Assessments (ESAs) in accordance with ASTM and All Appropriate Inquiries (AAI) standards. They also perform Caltrans Hazardous Materials Data Documents (HMDD) and Initial Site Assessments (ISAs), as well as corridor studies to identify potential environmental concerns early in the project development process.
Site Assessment: Their team specializes in sampling and analysis of soil and groundwater, installation and monitoring of groundwater wells, and assessment of contaminants such as per- and polyfluoroalkyl substances (PFAS), aerially deposited lead (ADL), and soil gases. They also conduct human health and ecological risk assessments to evaluate potential impacts.
Remediation: Group Delta develops and implements Remedial Action Plans (RAPs), Removal Action Workplans (RAWs), and Site Closure Reports. They design and operate remediation systems, apply smart remediation techniques following ASTM Greener Cleanup Standards, and optimize existing remediation systems to effectively manage contaminated soil and groundwater.
Construction Environmental Compliance: Services include mitigation monitoring, stormwater management, permitting and compliance support, contaminated soil and hazardous materials management, health and safety plan preparation, and construction dewatering strategies to ensure environmental compliance during construction activities.
Water Quality: Group Delta provides construction stormwater quality management, assists with industrial stormwater Best Management Practices (BMP) compliance, supports municipal National Pollutant Discharge Elimination System (NPDES) stormwater permits, and conducts water quality monitoring to protect water resources.
Air Quality: Their expertise encompasses air quality impact assessments, health risk evaluations, atmospheric dispersion modeling, emission inventories, and mobile source studies. They offer strategic technical support, litigation support for compliance and regulatory issues, and assessments of PFAS in air.
Hazardous Materials/Industrial Hygiene: Group Delta addresses hazardous materials concerns by conducting asbestos and lead-based paint assessments, indoor air quality evaluations, airborne contaminant monitoring, and hazardous waste management. They also develop health and safety plans to ensure safe working environments.
Through these services, Group Delta demonstrates a commitment to delivering high-quality environmental solutions that meet regulatory requirements and support sustainable project outcomes.
Group Delta offers comprehensive Existing Structure Evaluation services, providing a one-stop solution for assessing and enhancing existing buildings. Their multidisciplinary team conducts geotechnical investigations, site-specific seismic hazard evaluations, and structural material inspections to ensure structural integrity and compliance. They also perform forensic investigations, identifying causes of structural distress through floor level surveys and causation reports. Additionally, Group Delta addresses environmental concerns by conducting hazardous materials inspections and environmental assessments, ensuring safe and compliant building environments.
Group Delta offers comprehensive geotechnical engineering services to support both new construction and the retrofit or repair of existing structures. With decades of local experience, the firm conducts subsurface investigations, site characterizations, and provides foundation design recommendations for public and private clients. Their in-house geotechnical soils testing laboratories, certified by Caltrans, the City of Los Angeles, and AASHTO, perform a variety of tests in accordance with ASTM and other applicable standards. Services include site explorations, foundation analyses, slope stability evaluations, seismic hazard assessments, and dewatering design, among others. This integrated approach ensures that projects are grounded in reliable data and engineered for long-term performance.
Group Delta offers comprehensive geotechnical instrumentation services, providing installation and monitoring solutions for a variety of construction projects. Their expertise encompasses a range of instruments, including inclinometers, extensometers, strain gauges, load cells, piezometers, settlement points, and data loggers. These tools are essential for monitoring ground movement, structural stability, and environmental conditions during excavation and tunneling operations.
In addition to hardware installation, Group Delta excels in data management, utilizing data loggers and web-based acquisition systems for automated processing and distribution of information. This approach ensures real-time monitoring and facilitates timely decision-making on construction sites. Their extensive experience and strong relationships with major instrumentation manufacturers position them as a reliable partner for geotechnical instrumentation needs.
Group Delta operates two state-of-the-art materials testing laboratories located in Anaheim and San Diego, California. These facilities offer a comprehensive range of geotechnical and materials testing services, including analyses of soils, aggregates, asphalt concrete, reinforced and prestressed concrete, masonry, structural steel, welding, and fireproofing. The laboratories are accredited and certified by numerous local and national agencies, such as the Division of the State Architect (DSA), City of Los Angeles, U.S. Army Corps of Engineers, Caltrans, and the AASHTO Accreditation Program (AAP).
Group Delta’s Quality Assurance/Quality Control Program ensures that all testing and inspection functions are performed properly and consistently. Their Quality Systems Manual includes internal and external audits, participation in sample reference programs, and strict peer review processes. All reports are reviewed and signed by a registered professional engineer, providing clients with confidence in the accuracy and reliability of the laboratory results.
Group Delta offers comprehensive Materials Testing & Inspection services, delivering full-scope solutions for soils, construction materials, and special inspections. Their certified laboratories in Anaheim and San Diego, along with a team of field technicians and inspectors, ensure compliance with project specifications and regulatory standards across various construction types.
Their services encompass Quality Control (QC) and Quality Assurance (QA) testing for structural steel, concrete, masonry, fireproofing, drilled-in anchors, earthwork, and asphalt. Technicians and inspectors hold certifications from organizations such as the American Concrete Institute (ACI), International Code Council (ICC), American Welding Society (AWS), and American Society for Nondestructive Testing (ASNT). Capabilities include welding inspections, concrete placement monitoring, rebar and tendon placement, batch plant inspections, mortar and grout sampling, compaction testing, and asphalt mix design services.
Group Delta’s personnel are trained and certified to perform a wide range of inspections and tests, ensuring that construction materials and practices meet the highest quality standards. Their expertise supports projects of all sizes, from small additions to large-scale infrastructure developments.