2930 MAPLE ST KAISER PERMANENTE Geotech Report 2025-03-07

Geotechnical Engineering Report-Revised lrerracon Kaiser Everett Medical Center Everett,Washington December 18, 2019 Terracon Project No. 81195071 GeoReport. EXPLORATION AND TESTING PROCEDURES Field Exploration Exploration Type Number of Exploration Depthplanned Location Explorations (feet) Soil Borings 1 401/2 Planned building center Soil Borings 1 301/2 Planned building center Soil Borings 2 15 to 16 Planned building corner Soil Borings 4 20 to 21 Planned building corner Soil Borings 1 251/2 Planned building corner Below existing ground surface Exploration Layout and Elevations: Unless otherwise noted, Terracon personnel provided the exploration layout. Coordinates were obtained with a handheld GPS unit (estimated horizontal accuracy of about ±20 feet) and approximate elevations were obtained from Google Earth imagery. If elevations and a more precise boring layout are desired, we recommend boring locations be surveyed. Soil Boring Procedure: We advanced the borings with a truck-mounted rotary drill rig using continuous-flight hollow-stem augers. Four samples were obtained in the upper 10 feet of each boring and at intervals of 5 feet thereafter. Split-barrel sampling procedure were used for all sampling. This sampling method uses a standard 2-inch outer diameter sampler driven into the ground by a 140-pound automatic hammer falling a distance of 30 inches. The number of blows required to advance the sampling spoon the last 12 inches of a normal 18-inch penetration is recorded as the Standard Penetration Test(SPT) resistance value. The SPT resistance values, also referred to as N-values, are indicated on the boring logs at the test depths. Per Washington State regulations,all borings were backfilled with granular bentonite after their completion. The sampling depths, penetration distances, and other sampling information was recorded on the field boring logs. The samples were placed in appropriate containers and taken to our soil laboratory for testing and classification by a Geotechnical Engineer. Our exploration team prepared field boring logs as part of the drilling operations. These field logs included visual classifications of the materials encountered during drilling and our interpretation of the subsurface conditions between samples. Final boring logs were prepared from the field logs. The final boring logs represent the Geotechnical Engineer's interpretation of the field logs and include modifications based on observations and tests of the samples in our laboratory. Responsive ■ Resourceful ■ Reliable DTLD AMNANDTESTMPROCEDLR S 1 of