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North Oaks Company LLC <br />Project B2402335 <br />August 22, 2024 <br />Page 21 <br />where exterior grades promote drainage toward those edge areas. The contractor should place <br />drainpipes in small trenches, extended at least 8 inches below the aggregate base material. <br />C.7.g. Performance and Maintenance <br />We based the above pavement designs on a 20-year performance life for bituminous. This is the amount <br />of time before we anticipate the pavement will require reconstruction. This performance life assumes <br />routine maintenance, such as seal coating and crack sealing. The actual pavement life will vary depending <br />on variations in weather, traffic conditions and maintenance. <br />It is common to place the non -wear course of bituminous and then delay placement of wear course. For <br />this situation, we recommend evaluating if the reduced pavement section will have sufficient structure to <br />support construction traffic. <br />Many conditions affect the overall performance of the exterior slabs and pavements. Some of these <br />conditions include the environment, loading conditions and the level of ongoing maintenance. With <br />bituminous pavements in particular, it is common to have thermal cracking develop within the first few <br />years of placement and continue throughout the life of the pavement. We recommend developing a <br />regular maintenance plan for filling cracks in exterior slabs and pavements to lessen the potential <br />impacts for cold weather distress due to frost heave or warm weather distress due to wetting and <br />softening of the subgrade. <br />C.B. Utilities <br />C.8.a. Subgrade Stabilization <br />Earthwork activities associated with utility installations located inside the building area should adhere to <br />the recommendations in Section C.2.e. <br />For exterior utilities, we anticipate the soils at typical invert elevations will be suitable for utility support. <br />However, if construction encounters unfavorable conditions such as soft clay, organic soils or perched <br />water at invert grades, the unsuitable soils may require some additional subcutting and replacement <br />with sand or crushed rock to prepare a proper subgrade for pipe support. Project design and construction <br />should not place utilities within the 1H:1V oversizing of foundations. <br />BRAUN <br />INTERTEC <br />