I Unified Soil Classification System Test Procedures October 1988 6. PERFORMING ORGANIZATION CODE I 9. PERFORMING ORGANIZATION NAME AND ADDRESS 10. WORK UNIT NO. 7. AUTHOR(S) Amster K. Howard 8. PERFORMING ORGANIZATION REPORT NO. GR888 Bureau of Recl amati on Denver Office Denver, CO 80225 12. SPONSORING AGENCY NAME AND ADDRESS I DIBR 15.