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Zone. This fault has a potential to cause moderate strength seismic events. The subject site is located at 37.760022 Latitude and-120.997600 Longitude. It is recommended that your structural engineer use these coordinates to obtain the latest seismic design criteria. The site class is D. FIELD INVESTIGATION Our field investigation included a visual reconnaissance of the existing surface condition, subsurface exploratory boring and obtaining representative soil samples for laboratory testing. Subsurface conditions were explored by drilling one boring which was 25.0 feet deep using a NATS B-61 drill rig. The log of the boring which presents descriptions-and classifications of the soil strata encountered using the Unified Soil Classifications System has been included in Appendix A. A Unified Soil Classification symbol explanation has been included as Plate 1. The boring location is shown on Figure 2. Representative soil samples were obtained from the boring at selected depths for transportation to our laboratory. The samples recovered consisted of relatively undisturbed brass liner samples and disturbed bag samples. The samples are recovered by driving a 2-1/2 inch and 1 3/8 inch sampler into the ground. The samplers we re driven by repeatedly dropping a hammer weighting 140 pounds from a height of 30 inches. The number of blows were recorded and are expressed on the boring logs in a number representing blows per foot. The blow count provides a measure of soil.strength gth as it relates to soil's in situ consistency or condition. The samples were obtained from the borings generally at intervals not exceeding five feet. LABORATORY TESTING Classification Soils were visually classified according to the Unified Soil Classification System,as presented in the boring logs in Appendix A. Most of the laboratory testing program was designed to review classifications made in the field. I Moisture/Density The field moisture contents and dry unit weights were determined for selected soil samples. The wet unit wei�it was determined in pounds per cubic foot, and the field moisture content was determined as a percentage of the dry weight. The results of these tests are presented on the boring logs in Appendix A. (3)