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KLE/NFELOER �Bright People.Right Solutions. All imported fill materials to be used for engineered fill should be sampled and tested by Kleinfelder prior to being transported to the site. 5.2.5.3 Import and Non-Expansive Fill Compaction Criteria On-site or imported soils that meet the criteria outlined in Table 5-1 above that are to be used for engineered fill should be uniformly moisture conditioned to between 1 to 4 percentage points above the optimum moisture content, placed in horizontal lifts less than about 8 inches in loose thickness, and compacted to at least 90 percent relative compaction. The required moisture content at the time of compaction is dependent on the plasticity and expansion characteristics of the fill and would be assessed at the time of grading. 5.2.6 Anticipated Excavation Conditions 5.2.6.1 General It should be understood that this report does not represent a study of the excavatibility of the subsurface materials that may be encountered within the limits of the proposed project. The contractor should independently evaluate the condition of the subsurface materials in order to select the appropriate excavation equipment and techniques. Furthermore, the contractor should be aware of past development and activities at the site and the potential presence of abandoned utility lines, wells, and/or foundations that may be encountered. Excavation and removal of these features, if encountered, will require special consideration by the contractor. 5.2.6.2 Shallow Trenches The near-surface materials encountered in the borings consisted mostly of clay soils. These materials can be excavated with conventional backhoes or track-mounted excavators. The trench side walls within the clay materials are expected to stand near vertical for short periods of time but may tend to ravel as the material dries out or if perched groundwater seepage is present. Granular materials (sands and gravels) may cave/ravel, therefore, if encountered, trench sidewalls in these materials should be sloped, benched, or shored. Groundwater was not encountered in our borings and groundwater is not anticipated to be a concern to grading/excavation operations. 20210067.001A/ST020R111447 Page 13 of 37 May 11, 2020 ©2020 Kleinfelder www.kleinfelder.com