1815 13TH ST SEATTLE CHILDRENS NORTH CLINIC 2019-07-08

CENTRAL UTILITY PLANT PARKING LOT Everett,Washington APPENDIX A FIELD EXPLORATIONS General Subsurface soil and groundwater conditions were evaluated at the site by excavating nine test pits (TP-1 through TP-9) at the approximate locations shown in Figure 2. Locations of the explorations were determined in the field by pacing or measuring from site improvements. Test Pits Nine test pits (TP-1 through TP-9) were excavated to depths ranging from 41/2 to 81 feet below the existing ground surface. The test pits were excavated by Custom Backhoe on September 17,2012, using a rubber-tired Case 580L backhoe. The test pits were continuously observed by a geotechnical engineer from our firm who examined and classified the soils encountered, obtained representative soil samples, observed groundwater conditions and maintained a detailed log of each test pit. At completion of test pit excavation,the test pits were backfilled in lifts approximately 2 feet thick and tamped in place with the backhoe bucket. Grab samples of representative soil types were typically obtained from the test pits at geologic unit intervals and transported to our laboratory in Redmond,Washington. The soils encountered during the excavation of the test pits were visually classified in the field in general accordance with the Unified Soil Classification System (USCS), American Society for Testing and Materials (ASTM) D 2488, which is summarized in Figure A-1. Test pit logs are shown in Figures A-2 through A-10. These logs are based on our interpretation of the field and laboratory data and indicate the various soils encountered. They also indicate the depths at which the soils or their characteristics change, although the change may be gradual. The densities noted on the test pit logs are based on observations and judgment of the conditions encountered during excavation. GEOENGINEERS� October 17,2012 Page A-1 File No.10738-010-00