ASTM is a not-for-profit organization which provides a forum for producers, users, and ultimate consumers to meet on common ground and write standards for materials, products, and services. The standards are used by thousands of individuals, companies, and agencies. The competency of those geotechnical laboratories using ASTM practices and standards is assessed by the AASHTO Materials Reference Laboratory (AMRL) in conjunction with the AASHTO Accreditation Program.

Geotechnics has participated in the ASTM laboratory assessment and proficiency sample programs for soil and aggregates every year since 1996. The following is a list of ASTM practices and test methods for which Geotechnics has been accredited.

View Geotechnics' "Soil Proficiency Sample Results" from ASTM (PDF, 153k)
Read an Explaination of the ASTM Ratings (PDF, 146k)

• D3740 Minimum Requirements for Agencies Engaged in the Testing and/or Inspection of Soil and Rock as Used in Engineering Design and Construction

• D422 Test Method for Particle-Size Analysis of Soils
  
• D698 Test Method for Laboratory Compaction Characteristics of Soil Using Standard Effort
  
• D1557 Test Method for Laboratory Compaction Characteristics of Soil Using Modified Effort
  
• D1883 Test Method for California Bearing Ratio of Laboratory-Compacted Soils
  
• D2166 Test Method for Unconfined Compressive Strength of Cohesive Soil
  
• D2216 Test Method for Laboratory Determination of Water (Moisture) Content of Soil and Rock by Mass
  
• D2434 Test Method for Permeability of Granular Soils (Constant Head)
  
• D2435 Test Method for One Dimensional Consolidation Properties of Soils
  
• D2850 Test Method for Unconsolidated-Undrained Triaxial Compression on Cohesive Soils
  
• D3080 Test Method for Direct Shear Test of Soils Under Consolidated Drained Conditions
  
• D4318 Test Methods for Liquid Limit, Plastic Limit, and Plasticity Index of Soils
  
• D4767 Test Method for Consolidated Undrained Triaxial Compression Test for Cohesive Soils
  
• D5084 Test Methods for Measurement of Hydraulic Conductivity of Saturated Porous Materials Using a Flexible Wall Permeameter
  

Aggregate Test Methods

C127 Test Method for Density, Relative Density (Specific Gravity), and Absorption of Coarse Aggregate

C136 Test Method for Sieve Analysis of Fine and Coarse Aggregates