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625 Cypress Avenue Geotechnical Investigation Project No. W1895-88-01 - 19 - April 23, 2024 7.4.8 All excavations must be observed and approved in writing by the Geotechnical Engineer (a representative of Geocon). 7.4.9 All fill and backfill soils should be placed in horizontal loose layers approximately 6 to 8 inches thick, moisture conditioned to at least two percent above optimum moisture content, and properly compacted to a minimum 90 percent of the maximum dry density in accordance with ASTM D 1557 (latest edition). 7.4.10 The soils expected to be exposed during proposed excavations at the site are currently moist and the grading contractor should be aware that the existing soils are currently above optimum moisture content. Conditions could change seasonally. If the soils are in excess of 3 percent above optimum moisture content at the time of construction, the soils will likely require some spreading and drying activities in order to achieve proper compaction. 7.4.11 Although not anticipated for this project, all imported fill shall be observed, tested, and approved by Geocon West, Inc. prior to bringing soil to the site. Import fill should consist of the characteristics presented in the table below. SUMMARY OF IMPORT FILL RECOMMENDATIONS Soil Characteristic Values Expansion Potential “Low” (Expansion Index of 50 or less) Particle Size Maximum Dimension Less Than 6 Inches Free of Debris Corrosivity Less Detrimental Than Existing Onsite Soils 7.4.12. Where new paving is to be placed, it is recommended that all existing fill and soft alluvial soils be excavated and properly compacted for paving support. As a minimum, the upper 12 inches of soil should be scarified, moisture conditioned to at least two percent above optimum moisture content, and compacted to at least 95 percent relative compaction, as determined by ASTM Test Method D 1557 (latest edition). Paving recommendations are provided in the Preliminary Pavement Recommendations section of this report (see Section 7.9). 7.4.13 Utility trenches should be properly backfilled in accordance with the following requirements. The pipe should be bedded with clean sands (Sand Equivalent greater than 30) to a depth of at least 1 foot over the pipe, and the bedding material must be inspected and approved in writing by the Geotechnical Engineer (a representative of Geocon). The use of gravel is not