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Phelan Development Holly Master Plan - Buildings H & 1 15188.000.006 Geotechnical Exploration and designated trees, shrubs, and associated roots. Clean and backfill excavations extending below the planned finished site grades with suitable material compacted to the recommendations presented in Section 5.7. ENGEO should be retained to observe and test backfilling. Following clearing, the site should be stripped to remove surface organic materials. Strip organics from the ground surface to a depth of at least 2 to 3 inches below the surface. Remove strippings from the site or, if considered suitable by the landscape architect and owner, use them in landscape fill. 5.4 OVER-OPTIMUM SOIL MOISTURE CONDITIONS The contractor should anticipate encountering excessively over-optimum (wet) soil moisture conditions during winter or spring grading, or during or following periods of rain. In addition, wet soil conditions may be found during sub excavation operations due to shallow groundwater table. Wet soil can make proper compaction difficult or impossible. Wet soil conditions can be mitigated by: 1. Frequent spreading and mixing during warm dry weather, 2. Mixing with drier materials, 3. Mixing with a lime or cement product, or 4. Stabilizing with aggregate or geotextile stabilization fabric, or both. Options 3 and 4 should be evaluated by ENGEO prior to implementation. 5.5 ACCEPTABLE FILL On-site soil material is suitable for placement as engineered fill material provided it is processed to remove concentrations of organic material, debris, and particles greater than 8 inches in maximum dimension. Imported fill materials should meet the above requirements and have a plasticity index less than the on-site material. Allow ENGEO to sample and test proposed imported fill materials at least 5 days prior to delivery to the site. 5.6 REUSE OF ON-SITE RECYCLED MATERIALS If desired to reuse asphaltic or concrete as engineered fill, we recommend that it be ground up and thoroughly mixed with on-site or import soil. In general, recycled asphalt or concrete should be ground down to less than 4 inches in greatest dimension, with no more than 25 percent larger than 2'/2 inches. Recycled material should be thoroughly mixed with a sufficient amount of soil, such that there is no more than 40 percent by weight of recycled material in the final mix. 5.7 FILL COMPACTION 5.7.1 Grading in Structural Areas Perform subgrade compaction prior to fill placement, following cutting operations, and in areas left at grade as follows. ENGEOPage 114 December 13, 2021 Expect Exceltence