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Bremer Financial Corporation Project B2008939 November 17, 2020 Page 10 perform a subcut of 1 to 3 feet below the pavement and then remove or recompact the excavated soils. More commonly, the contractor removes the pavement and then surface compacts and proofrolls the exposed soils to identify weak spots in the subgrade. The contractor then corrects any identified weak areas. C.2. Site Grading and Subgrade Preparation C.2.a. Building Subgrade Excavations: Option A – Standard Soil Correction We recommend removing unsuitable materials from within the building pad and oversizing areas . We define unsuitable materials as existing fill, frozen materials, organic soils, existing structures, existing utilities and associated backfill, vegetation and soft/very loose soils. Table 4 shows the anticipated excavation depths and bottom of excavation elevations for each of the borings in relation to the assumed finished floor elevation (FFE) of the building. Table 4. Building Excavation Depths Location Approximate Surface Elevation (ft MSL) Anticipated Excavation Depth (ft) Anticipated Bottom Elevation (ft MSL) Anticipated Depth Below FFE 915 MSL (ft) ST-1 915.0 12 903 12 ST-2 914.9 11 903 1/2 11 1/2 ST-3 913.9 9 904 1/2 10 1/2 ST-4 911.4 12 899 16 ST-5 912.3 12 900 15 Excavation depths will vary between the borings. Portions of the excavations may also extend deeper than indicated by the borings. A geotechnical representative should observe the excavations to make the necessary field judgments regarding the suitability of the exposed soils. The contractor should use equipment and techniques to minimize soil disturbance. If soils in the excavation bottoms become disturbed or are wet, we recommend excavation, replacement and recompaction.