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Appendix A - Field Investigation 2001 E. Dyer Road Santa Ana, California GDC Project No. LA-1248A Page A-2 diameter. California samples were removed from the sampler, retained in the rings and placed in sealed plastic canisters to prevent loss of moisture. At each sampling interval, the drive samplers were fitted onto sampling rod, lowered to the bottom of the boring, and driven 18 inches or to refusal (50 blows per 6 inches) with a 140-Ib hammer free-falling a height of 30-inches using an automatic hammer. The number of hammer blows to advance the samplers each 6" increment is presented on the boring records. When samplers advanced under static weight of the hammer without driving, a "P" for "push" was recorded on the boring records for each 6" increment. Compared to the SPT, the California sampler provides less disturbed samples. Shelby Tubes provide the least sample disturbance and are considered undisturbed. Relative Density and Consistencv Equivalent SPT N*60 values were used as the basis for classifying relative density of granular/cohesionless soils. Wherever possible, consistency classification of cohesive soils was based on undrained shear strength estimated in the field with a pocket penetrometer or by testing in the laboratory. Drive sample field blow Counts, SPT N*60 values, pocket penetrometer readings and corresponding density/consistency classifications are presented on the boring records. Borehole Abandonment At the completion of the drilling groundwater was measured (where possible) and the borings were abandoned by backfilling the borehole with Bentonite / cement grout. The surface was patched with cold mix asphalt concrete. Notes describing the borehole abandonment are presented on the boring records. Sample Handling and Transport Geotechnical samples were preserved and transported in general accordance with ASTM D 4220. Samples were sealed to prevent moisture loss, packed in appropriate protective containers, and transported to the geotechnical laboratory for further examination and geotechnical testing. Laboratory Testing The soils were further examined and tested in the laboratory and classified in accordance with the USCS following ASTM D 2487 and D 2488. Field classifications presented on the boring records were modified where necessary on the basis of the laboratory test results. Descriptions of the laboratory tests performed and test results are presented in Appendix B. k GROLIP DELTA