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Project No. JB -314 24 March 2003 Page 2 2.0 SITE EXPLORATION AND LABORATORY TESTING 2.1 Site Exploration The subsurface conditions of the site were explored on 19 March 2003. The exploration consisted of drilling three exploratory borings to a maximum depth of about 26% feet below the existing site grade. All boring locations drilled at the project site are shown in Figure 2, Boring Location Map. The borings were drilled using a truck -mounted, CME 45 drilling rig. Soils encountered during drilling were logged and samples were obtained to aid in material classification and for laboratory testing. Soil samples were recovered in either a 3 -inch or 2.5 -inch outside diameter (OD) California sampler or a Standard Penetration Sampler driven by a 140 -pound hammer free -falling 30 inches. The number of blows applied to advance the sampler was recorded for each 6 inches of penetration. Blow counts from the bottom 12 inches of penetration were recorded on the logs as blows per foot and recorded on the boring logs. Figure 3, Boring Log Legend, illustrates the Unified Soil Classification System which was used to identify subsurface soil during drilling. The logs describing the material encountered in the borings were recorded in the field by our representative and are shown on Figures 4 through 6. 2.2 Laboratory Testing Laboratory testing was conducted on selected samples to obtain data on density, moisture content, and classification of the soil. Test results are shown on the Boring Logs. Atterberg limits were performed on samples of the surface soil. The tests were performed according to American Society for Testing and Materials (ASTM) test methods and procedures. The test results indicate a high expansion potential. The test results are shown on the Boring Logs. A resistance value (R -Value) test was performed on a representative a bulk sample of the probable pavement subgrade soils. The R -Value test was performed according to California Department of Transportation (Caltrans) test methods. The test results indicate an R -Value of 5. 3.0 SUBSURFACE CONDITIONS 3.1 Surface At the time of our field exploration, the subject site was observed to be an an abandoned service station as shown in Figure 7, Photographs of Project Site. The kSKorbmacher Engineering, Inc.