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Temporary Shoring Recommendations <br />Proposed Apartments: 1020 North Broadway, Everett, Washington <br />July 5, 2018 <br />The temporary shoring wall will be constructed by excavating a trench to the construction <br />subgrade elevation and then backfilling the excavation with CDF. The CDF will be cast <br />neat against the trench sidewalls. <br />After the CDF has cured, the building excavation will be accomplished on the inside of the <br />CDF shoring wall. After the building is complete, the CDF shoring wall will be abandoned <br />in place. <br />The CDF shoring wall will support a temporary excavation with a maximum height of <br />about 10 feet. Above the wall will be an ascending cut slope ranging up to four feet high <br />with a gradient of 1H:1V. The ground surface below the wall will be level. <br />CDF SHORING WALL RECOMMENDATIONS <br />The following recommendations can be used for the CDF shoring: <br />• The maximum recommended wall height is 10 feet. For this wall height, the <br />CDF shoring wall should have a minimum width of three feet. <br />• Loose soils in the base of the trench should be cleaned out using a clean -out <br />bucket on an excavator. <br />• The CDF mix design should be at least 1'/2 sacks of Portland cement per cubic <br />yard. <br />• The wall face should be constructed vertical. <br />• The grade above the wall may be level or sloping upward at a maximum <br />inclination of 111:1V. <br />• The grade at the base of the wall should be level. The base of the CDF shoring <br />wall does not need to be keyed below the base of the excavation. <br />• PanGEO should observe the excavation for the CDF shoring and the building <br />excavation as the face of the shoring wall is exposed. <br />The performance of the CDF shoring wall should be monitored by a professional survey <br />using optical survey methods. We recommend points be established at least every 20 feet <br />along the length of the wall. The points should be monitored at least twice a week during <br />excavation and at least once a week after the building footing is cast against the base of th _, <br />17-233 1020 N Broadway - CDF Shoring17 233 1020 N n..,...a..uyPage <br />PanGEO, Inc. <br />L� <br />