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Phelan Development Holly Master Plan - Buildings H & 1 <br /> 15188.000.006 Geotechnical Exploration <br /> 1. Scarify to a depth of at least 8 inches. <br /> 2. Moisture condition soil to at least 3 percentage points over the optimum moisture content. <br /> 3. Compact fill to a minimum of 90 percent relative compaction. Compact the upper 12 inches of <br /> fill in pavement areas to at least 95 percent relative compaction prior to AB placement. <br /> After the subgrade has been compacted, place and compact acceptable fill as follows. <br /> 1. Spread fill in loose lifts that do not exceed 8 inches. <br /> 2. Moisture condition lifts to at least 3 percentage points over the optimum moisture content. <br /> 3. Compact fill to a minimum of 90 percent relative compaction. Compact the upper 12 inches of <br /> fill in pavement areas to at least 95 percent relative compaction prior to AB placement. <br /> Compact the pavement Caltrans Class 2 Aggregate Base section to at least 95 percent relative <br /> compaction (ASTM D1557). Moisture condition AB to or slightly above the optimum moisture <br /> content prior to compaction. <br /> 5.7.2 Underground Utility Backfill <br /> 5.7.2.1 General <br /> Recommendations for fill compaction of underground utility backfill within structural areas are <br /> provided in this section. Jetting of backfill is not an acceptable means of compaction.Where utility <br /> trenches cross perimeter building foundations, backfill with native clay soil for pipe bedding and <br /> backfill for a distance of 3 feet on each side of the foundation. This will help prevent the normally <br /> granular bedding materials from acting as a conduit for water to enter beneath the building. As an <br /> alternative, a sand cement slurry (minimum 28-day compressive strength of 500 psi) may be used <br /> in place of native clay soil. <br /> The contractor is responsible for conducting all trenching and shoring in accordance with <br /> CALOSHA requirements. Project consultants involved in utility design should specify pipe bedding <br /> materials. <br /> 5.7.2.2 Structural Areas <br /> Place and compact trench backfill as follows. <br /> 1. Trench backfill should have a maximum particle size of 6 inches. <br /> 2. Moisture condition trench backfill to at least 3 percentage points above the optimum moisture <br /> content. Moisture condition backfill outside the trench. <br /> 3. Place fill in loose lifts not exceeding 12 inches. <br /> 4. Compact fill to a minimum of 90 percent relative compaction. <br /> ENGEOPage 115 December 13, 2021 <br /> Expect Excellence <br />