2320 CALIFORNIA ST Geotech Report 2025-07-25

I I ' APPENDIX A FIELD EXPLORATIONS Subsurface conditions were explored at the site by excavating five test pits(TP-1 to TP-5). The test pits were completed on September 28, 2009 to depths ranging from 5 to 51/2 feet below the existing ground surface. The locations of the test pits were estimated by measuring distances from site features in the field by 1 taping/pacing and should be considered approximate. The approximate locations of the test pits are shown on the Site Plan, Figure 2. Ground surface elevations shown on the test pit logs were estimated based on the base survey map shown on Figure 2. The test pits were excavated using a Case 580 backhoe. The test pits were continuously observed by an engineering geologist from our firm who classified the soils encountered, obtained representative soil samples and maintained a detailed log of each test pit. The upper four feet of each test pit was probed with a 1/2-inch diameter steel probe rod to estimate density. Probe depths (P) are shown on the test pit logs. In addition, pertinent information including soil sample depths, stratigraphy, caving, and groundwater seepage were recorded. The soils encountered during excavation were visually classified in general accordance with the soil classification system described in Figure A-1. The logs of the test pits are presented in Figures A-2 through A-6. Representative soil samples were obtained from the test pits, logged, sealed in plastic bags and transported to our laboratory. The field classifications were further evaluated in our laboratory. Observations of groundwater conditions were made during excavation. Groundwater conditions encountered during excavation are presented on the test pit logs. Groundwater conditions observed during excavation represent a short term condition and may or may not be representative of the long term groundwater conditions at the site. L 1 I 1 GEOENGINEERS/ October30,2009 Page A-1 Fle No.0482-031-02 I