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APPENDIX A FIELD INVESTIGATION A.1 Introduction The subsurface conditions of the additional field investigation for the proposed Alliance Heritage Residential Project were investigated by performing 5 hollow-stem auger (HSA) borings (B-8 through B-12). The locations of the additional explorations and previous explorations (B-1 through B-7) are presented in Figure 2 of the main report. Prior to beginning the field exploration program, access permission and encroachment permits were obtained as necessary from Orange County Health Care Agency (OCHCA). Underground Service Alert (USA) was notified for checking subsurface utilities. In addition, geophysical methods were also utilized to locate any potential subsurface utilities. The exploration methods are described in the following sections. A.2 Soil Drilling and Sampling Drilling. Logging. and Soil Classification Borings were drilled by Group Delta Consultants' (GDC) subcontractors, Martini Drilling and 2R Drilling, under the continuous technical supervision of a GDC field engineer, who visually inspected the soil samples, checked groundwater levels when encountered, maintained detailed records of the borings, and visually / manually classified the soils in accordance with the American Society for Testing and Materials (ASTM) D 2488 (Visual-Manual Procedure) and ASTM D 2487 (Unified Soil Classification System [USCS]). Logging and classification was performed in general accordance with Caltrans' "Soil and Rock Logging Classification, and Presentation Manual (2010 Edition)". A Boring Record Legend and Key for Soil Classification are included in this Appendix. Sampling Drive samples were collected at a depth interval of 5 feet to the bottom of explored depth. The sampling was performed using Standard Penetration Test (SPT) samplers in accordance with ASTM D 1586 and Ring-Lined "California" Split Barrel samplers in accordance with ASTM D 3550. Bulk samples were collected from auger cuttings and placed in plastic bags. SPT drive samples were obtained using a 2-inch outside diameter and 1.375-inch inside diameter split-spoon sampler without lining. The soil recovered from the SPT sampling was sealed in plastic bags to preserve the natural moisture content. California drive samples were collected with a 3-inch outside diameter, 2.5-inch inside diameter split barrel sampler with a 2.42-inch inside diameter cutting shoe. The sampler barrel is lined with 18-inches of brass rings for sample collection and has an additional length of waste barrel. The brass liner rings for sample collection are 1-inch high, 2.42-inch inside diameter, and 2.5-inch outside GROUP DELTA