Laserfiche WebLink
North Oaks Company LLC <br />Project B2402335 <br />August 22, 2024 <br />Page 20 <br />The contractor should correct areas that display excessive yielding or rutting during the proofroll, as <br />determined by the geotechnical representative. Possible options for subgrade correction include <br />moisture conditioning and re -compaction, subcutting and replacement with soil or crushed aggregate, <br />chemical stabilization and/or geotextiles. We recommend performing a second proofroll after the <br />aggregate base material is in place, and prior to placing bituminous or concrete pavement. <br />C.7.c. Design Sections <br />Our scope of services for this project did not include laboratory tests on subgrade soils to determine an <br />R-value for pavement design. Based on our experience with similar silty sand soils anticipated at the <br />pavement subgrade elevation, we recommend pavement design assume an R-value of 30. Note the <br />contractor may need to perform limited removal of unsuitable or less suitable soils to achieve this value. <br />Table 12 provides recommended pavement sections, based on the soils support and traffic loads. <br />Table 12. Recommended Bituminous Pavement Sections <br />Use <br />Light Duty <br />Heavy Duty <br />Minimum asphalt thickness <br />3 1/2 <br />4 <br />(inches) <br />Minimum aggregate base thickness <br />8 <br />12 <br />(inches) <br />C.7.d. Bituminous Pavement Materials <br />Appropriate mix designs are critical to the performance of flexible pavements. We can provide <br />recommendations for pavement material selection during final pavement design. <br />C.7.e. Concrete Flatwork <br />Subgrade preparation for concrete flatwork (aprons, dumpster pads, etc.) should be consistent with <br />those recommendations provided for exterior slabs and bituminous pavements. We anticipate traffic <br />loads on sidewalks will be limited to primarily pedestrian foot traffic. Given the assumed subgrade <br />parameters and loading conditions, we recommend design of concrete flatwork include a minimum <br />5-inch concrete section over 6 inches of aggregate base. <br />C.7.f. Subgrade Drainage <br />Given the abundance of native silty sands at or near pavement subgrades, we recommend installing <br />perforated drainpipes throughout pavement areas at low points, around catch basins, and behind curb in <br />landscaped areas. We also recommend installing drainpipes along pavement and exterior slab edges <br />BRAUN <br />INTERTEC <br />