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Geotechnical Engineering Investigation Page 11 of 24 New Residential Subdivision 2706 Pock Lane Stockton, CA 95205 March 30, 2021 CTE Job # 25-1097G possible re-use as engineered fill or disposed of in landscape areas or offsite. Utilities that extend into the construction area and are scheduled to be abandoned should be properly capped at the perimeter of the construction zone or moved as directed in the plans. CTE personnel shall observe and confirm that all asphalt and concrete debris, vegetation, other organic material has been adequately removed in all proposed improvement areas. Following removal of debris and stripping, 24 inches of soil should be excavated, and 12 inches of the exposed native soil should be scarified, moisture conditioned to 3% above optimum, and compacted between 88-92%relative compaction per ASTM D1557. Special moisture conditioning of engineered fills during earthwork operations as well as pre- saturation of subgrade soils prior to structure foundation or surface improvement construction should be performed. Further subgrade treatment or removal and replacement may be required to mitigate hazards posed by expansive soils. Upon the completion of prepared areas, the exposed subgrade should be verified by a CTE representative to consist of intact,relatively undisturbed native soils. If such soils are not observed at this level, additional removal may be required. 5.2 Grading and Earthwork Soils generated from the site are not considered acceptable for engineered fill without mitigating their expansion potential. Import soils proposed for engineered fill should have an Expansion Index(EI)less than 20. Particles greater than 3 inches should be removed if they are likely to come into contact with one another during placement, and 20% to 80% of the soil particles should pass the #200 sieve. Imported fill meeting the requirements should be placed in 8-inch loose lifts, and moisture conditioned to at least optimum moisture content and should be compacted to at least 90% relative compaction per ASTM D1557. A CTE representative should approve all imported soils prior to delivery to the site.