2710 14TH ST BLDG A Geotech Report 2023-12-29

C� ' APPENDIX A FIELD EXPLORATIONS SSubsurface soil and groundwater conditions were explored by completing 17 test pits (TP-1 through TP-17) on September 5, 2019 to depths rangingfrom 4.5 to 12.5 feet. The test pits were completed using a rubber tire -mounted Komatsu WB 140 backhoe owned and operated by Kelly's Excavating under subcontract to GeoEngineers. The test pit locations were determined in the field by measuring from existing site features. The approximate test pit locations are shown on Figure 2. The test pits were continuously monitored by a geotechnical engineer from our firm who reviewed and classified the soils encountered, obtained representative soil samples, observed groundwater conditions ' and prepared a detailed log of each exploration. Disturbed samples of representative soil types were obtained from the excavator bucket at representative depths. Soils encountered in the test pits were classified in the field in general accordance with ASTM D 2488, the Standard Practice for Classification of Soils, Visual -Manual Procedure, which is summarized in Figure A-1. Logs of the test pits are provided in Figures A-2 through A-18. The test pits logs are based on our interpretation of the field and laboratory data and indicate the various types of soils and groundwater conditions encountered. The logs also indicate the depths at which these soils or their characteristics change, although the change may actually be gradual. Observations of groundwater conditions were made during the excavations. The groundwater conditions encountered during excavation of the test pits are presented on the test pit logs. Groundwater conditions observed during excavation of the test pits represent a short-term condition and may or may not be representative of the long-term groundwater conditions at the site. Groundwater conditions observed during test pit excavation should be considered approximate. I GWENGINEER� October30.2019 PageA-1 File W 21288-002 00