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APPENDIX A SUBSURFACE EXPLORATION PROGRAM PROPOSED ACCESSORY DYYELL ING UNIT 1041 South Denn s St/eet SANTA ANA, CALIFORNIA Prior to drilling, the proposed boring was located in the field by measuring from existing site features. A total of one exploratory boring (B-l) was drilled using a hollow-stem auger drill rig equipped with 8-inch outside diameter (O.D.) augers. GeoBoden. Inc. performed the drilling. The boring location is shown on Figure 2. Depth-discrete soil samples were collected at selected intervals from the exploratory boring using a 2 % -inch inside diameter (1.D.) modified Califomia Split-barrel sampler fitted with l2 brass ring of 2 % inches in O.D. and I -inch in height and one brass liner (2 '/, -inch O.D. by 6 inches long) above the brass rings. The sampler was lowered to the bottom ofthe borehole and driven l8 inches into the soil with a 140-pound hammer falling 30 inches. The number ofl blows required to drive the sampler the lower l2 inches is shown on the blow count column of the boring log. After removing the sampler liom the borehole. the sampler was opened and the brass rings and liner containing the soil were removed and observed for soil classification. Brass rings containing the soil were sealed in plastic canisters to preserve the natural moisture content of the soil. Soil samples collected from exploratory boring were labeled and submitted to the laboratory for physical testing. Standard Penetration Tests (SPTs) were also performed at altemative depths in Boring. The SPT consists ofdriving a standard sampler. as described in the ASTM 1586 Standard Method, using a 140-pound hammer falling 30 inches. Ihe number of blows required to drive the SPT sampler the lower l2 inches of the sampling interval is recorded on the blow count column of the boring logs. A-l