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

J ' 2.0 FIELD EXPLORATIONS AND LABORATORY TESTING ' 2.1. Field Explorations Subsurface conditions were evaluated through a field exploration program that consisted of excavating and sampling 17 test pits across the three sites. The test pits were completed on September 5, 2019 using a ' rubber -tired backhoe subcontracted to GeoEngineers. The approximate locations of the test pits are shown on Figure 2. The test pits, designated TP-1 through TP-17, were completed to depths rangingfrom 4.5 to 12.5 feet below the existing ground surface. Locations of the test pits were determined in the field by tape measuring to existing site features such as the sidewalks, light poles, and buildings. Elevations at the test pit locations ' were interpolated from the site surveyed developed by Pace Engineers. The respective ground surface elevations are shown on the test pit logs in Appendix A. Appendix A includes logs of the test pits ' (Figures A-2 through A-18) and details of the subsurface explorations performed. 2.2. Laboratory Testing ' Soil samples obtained from the test pits were transported to GeoEngineers' laboratory and evaluated to confirm or modify field classifications, as well as to evaluate engineering properties of the soil. Representative samples were selected for laboratory testing consisting of moisture content, fines content ' (material passing the U.S. No. 200 sieve), and grain size distribution. The tests were performed in general accordance with test methods of the American Society for Testing and Materials (ASTM) and other applicable procedures. A description of the laboratory testing and the test results are presented in Appendix B. 3.0 SITE CONDITIONS 3.1. Surface Conditions ' Sites 1, 2, and 3 are situated near the crest of a moderately sloping east -facing hillside. Most existing residential units within the Baker Heights neighborhood are abandoned at this time and bordered up. ' Site 1 and is bounded by 14th Street to the north, Pine Street to the east, 15th Street to the south and the EHA facilities office and the Baker Community Center to the west. Larch and Fir Streets run through Site 1 and based on the concept drawings provided by EHA, both of these streets will be demolished and built ' over. Grades at Site 1 slope down moderately towards the southeast with elevations ranging from approximately 110 feet in the northwest corner to about 70 feet in the southeast corner. Twelve residential units exist within Site 1. The residential buildings are surrounded by lawn and landscape areas. Concrete I sidewalks exist adjacent to the streets and concrete paths and/or stairs lead to each unit. Site 2 is rectangular in shape and occupies approximately 2.1 acres along the east side of Fir Street ' between 121h Street and 14th Street. the east side of Site 2 are bordered by residential properties. Site 2 grades are relatively flat and range from about Elevation 70 feet at the north end to about Elevation 71 to 76 feet on the south end near 14th Street. Seven existing residential units occupy Site 2. Site 3 is situated at the northwest corner of Site 1 where Building 1334 is located and west of the intersection of Poplar Street and 141h Street. An existing residential unit is located on the northern portion I GWENGINEER� October30,2019 Page2 File No. 21288-002 00