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North Oaks Company LLC <br />Project B2402335 <br />August 22, 2024 <br />Page 12 <br />An OSHA -approved qualified person should review the soil classification in the field. Excavations must <br />comply with the requirements of OSHA 29 CFR, Part 1926, Subpart P, "Excavations and Trenches." This <br />document states excavation safety is the responsibility of the contractor. The project specifications <br />should reference these OSHA requirements. <br />CIA Excavation Dewatering <br />We recommend removing groundwater from the excavations. Project planning should include temporary <br />sumps and pumps for excavations in low -permeability soils, such as clays and silts. Dewatering of high - <br />permeability soils (e.g., sands) from within the excavation with conventional pumps has the potential to <br />loosen the soils, due to upward flow, and we recommend that well points or dewatering wells be used in <br />these areas. <br />C.2.e. Engineered Fill Materials and Compaction <br />Table 8 below contains our recommendations for engineered fill materials. <br />Table 8. Engineered Fill Materials* <br />Locations <br />Engineered <br />Possible Soil Type <br />Additional <br />To Be Used <br />Fill Classification <br />Descriptions <br />Gradation <br />Requirements <br />■ Below <br />< 2% Organic <br />foundations <br />100% passing 3-inch sieve <br />Content (OC) <br />Structural fill <br />SP-SMSMSC <br />, , <br />■ Below interior <br />< 25% passing #200 sieve <br />Plasticity Index <br />slabs <br />(PI) <20% <br />Any structural fill <br />Deep Structural <br />100% passing 3-inch sieve <br />greater than 8 feet <br />SP, SP-SM <br />< 2% OC <br />fills <br />< 12% passing #200 sieve <br />(from slab grade) <br />■ Drainage layer <br />■ Free -draining <br />100% passing 1-inch sieve <br />■ Non -frost- <br />■ Non -frost- <br />SP <br />< 50% passing #40 sieve <br />< 2% OC <br />susceptible <br />susceptible fill <br />< 5% passing #200 sieve <br />Behind below- <br />< 2% OC <br />grade walls, <br />Plasticity Index <br />Retained fill <br />SP-SM, SM, SC <br />100% passing 3-inch sieve <br />beyond drainage <br />(PI) <br />layer <br />< 4% <br />OC <br /><2%OC <br />Pavements <br />Pavement fill <br />SP-SM, SM, SC, CL <br />100% passing 3-inch sieve <br />PI < <br />Below landscaped <br />surfaces, where <br />SP-SM, SM, SC, CL, <br />Non-structural fill <br />100% passing 6-inch sieve <br />< 10% OC <br />subsidence is not <br />OL <br />a concern <br />*More select soils comprised of coarse sands with < 5% passing #200 sieve may be needed to accommodate work occurring in <br />periods of wet or freezing weather. <br />BRAUN <br />INTERTEC <br />