931 BROADWAY SEPA 016 - 008 - TEUTSCH PARTNERS Geotech Report 2025-04-14

Geotechnical Report Proposed Student Housing: 931 Broadway Street, Everett, Washington December 8, 2015 Wall backfill should be properly moisture conditioned, placed in loose, horizontal lifts less than 8 to 12 inches in thickness, and systematically compacted to a dense and relatively unyielding condition and to at least 95 percent of the maximum dry density, as determined using test method ASTM D-1557. Within 5 feet of the wall, the backfill should be compacted with hand-operated equipment to at least 90 percent of the maximum dry density. 4.5 PERMANENT CUT AND FILL SLOPES Based on the anticipated soil that will be exposed in the planned excavation, we recommend permanent cut and fill slopes be constructed no steeper than 2H:1 V (Horizontal:Vertical). 5.0 TEMPORARY EXCAVATIONS Temporary excavations should be constructed in accordance with Part N of WAC (Washington Administrative Code) 296-155. The contractor is responsible for maintaining safe excavation slopes and/or shoring. We anticipate the excavation will encounter 2 to 5 feet of fill over glacial till. Based on these conditions the building excavation can be accomplished as an open cut with a 1 H:1 V within the fill, and '//H:1 V within the glacial till. An L-shaped footing may be used to conserve space for temporary excavations. Temporary excavations should be evaluated in the field during construction based on actual observed soil conditions. If seepage is encountered, excavation slope inclinations may need to be reduced. During wet weather, the cut slopes may need to be flattened to reduce potential erosion or should be covered with plastic sheeting. If there is not sufficient room to maintain the excavation within the limits of the property, temporary easements may be needed to slope the excavation into the adjoining properties. If easements cannot be obtained, then temporary shoring may be needed. 15-275 931 Broadway,Everett Page /d PanGEO, Inc.