1515 132ND ST SE Geotech Report 2022-10-25

TABLE OF CONTENTS Section Page N C O N P O R A T! N............................................................................................ 1.0 GENERAL.................................................................................................................1 2.0 SITE AND PROJECT DESCRIPTION.....................................................................1 3.0 SUBSURFACE EXPLORATIONS...........................................................................3 3.1 SITE GEOLOGY................................................................................................3 3.2 SUBSURFACE EXPLORATION...........................................................................3 3.3 SOIL CONDITIONS............................................................................................3 3.4 GROUNDWATER..............................................................................................4 4.0 INFILTRATION CONSIDERATIONS....................................................................5 5.0 GEOTECHNICAL RECOMMENDATIONS...........................................................5 5.1 SEISMIC DESIGN PARAMETERS........................................................................5 5.2 BUILDING FOUNDATIONS................................................................................6 5.2.1 Lateral Resistance...........................................................................7 5.2.2 Perimeter Footing Drains...............................................................7 5.2.3 Footing Subgrade Preparation.......................................................7 5.3 FLOORS SLABS................................................................................................7 5.4 RETAINING WALL DESIGN PARAMETERS........................................................8 5.4.1 Lateral Earth Pressures..................................................................8 5.4.2 Surcharge........................................................................................9 5.4.3 Lateral Resistance...........................................................................9 5.4.4 Wall Drainage.................................................................................9 5.4.5 Wall Backfill....................................................................................9 5.5 PERMANENT CUT AND FILL SLOPES................................................................10 6.0 EARTHWORK CONSIDERATIONS.......................................................................10 6.1 STRIPPING, CLEARING AND SUBGRADE PREPARATION....................................10 6.2 TEMPORARY EXCAVATIONS AND SHORING.....................................................11 6.3 MATERIAL REUSE...........................................................................................11 6.4 STRUCTURAL FILL AND COMPACTION.............................................................11 6.4.1 Underground Storage Tank Decommissioning Backfill .................12 6.5 WET WEATHER CONSTRUCTION.....................................................................12 6.6 EROSION CONSIDERATIONS.............................................................................13 7.0 ADDITIONAL SERVICES.......................................................................................14 8.0 CLOSURE.................................................................................................................14 9.0 REFERENCES...........................................................................................................16 ATTACHMENTS: Figure 1 Vicinity Map Figure 2 Site and Exploration Plan Appendix A Boring Logs Figure A-1 Terms and Symbols for Boring and Test Pit Logs Figures A-2 to A-4 Logs of Test Borings PG -I, PG-2 and PG-3 19-049 1515 132nd St SE Page 1 PanGEO, Inc.