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. these soils at the lower level or on lean concrete backfill placed in the excavations if the design bearing pressure is 6,000 psf. This is illustrated on the sketch below. 7_7— i l_--- r Illi :•.'�,: :•. :•: III: DESIGN FOOTING LEVEL LEAN CONCRETE RECOMMENDED _ EXCAVATION LEVEL -III-III-III- - - LEAN CONCRETE BACKFILL NOTE:EXCAVATIONS ARE SHOWN VERTICAL;HOWEVER,THE SIDEWALLS SHOULD BE SLOPED AS NECESSARY FOR SAFETY If the design bearing pressure is 3000 psf, structural fill may be placed in the excavation provided the over-excavation and backfill zone is constructed as shown below. I DESIGN FOOTING LEVEL ` STRUCTURAL FILL D _ RECOMMENDED W EXCAVATION LEVEL -111-�1��LIF17rjl I 11- OVER-EXCAVATION/BACKFILL ZONE NOTE:EXCAVATIONS ARE SHOWN VERTICAL;HOWEVER,THE SIDEWALLS SHOULD BE SLOPED AS NECESSARY FOR SAFETY Foundation Drains We recommend that the building be encircled with a perimeter foundation drain to collect exterior seepage water. This drain should consist of a 4-inch diameter perforated pipe within an envelope of washed rock, extending at least 6 inches on all sides of the pipe. The washed rock should conform to WSDOT Section 9-03.12(4), Gravel Backfill for Drains or 9-03.12(5), Gravel Backfill for Drywells. The washed rock envelope should be wrapped with filter fabric (such as Mirafi 140N) to reduce the migration of fines from the surrounding soil. Ideally, the drain invert would be installed no more than 8 inches above or below the base of the perimeter footings. The perimeter foundation drain should not be connected to roof downspout drains and should be constructed to Responsive ■ Resourceful ■ Reliable 13