SHI Builders West Orange NJ Prelim GI SWM Report 1

provided moisture contents are within tolerable limits to achieve compaction and that oversized materials/deleterious debris (if encountered) are segregated. Portions of the on-site soils are considered moisture sensitive and will require moisture conditioning during a period of favorable weather, mixing with granular soils, and/or chemical stabilization (such as lime or cement mixing), and/or will become impractical for reuse if exposed to moisture. As such, the contractor should include a unit rate for importing structural fill material and exporting unsuitable material. Reuse of these materials will be contingent upon further evaluation during construction. Compaction and Placement Requirements: Structural fill and backfill should be placed in maximum 12-inch loose lifts and compacted to 95 percent of the maximum dry density within a targeted two percent of the optimum moisture content as determined by ASTM D 1557 (Modified Proctor). Variations in moisture content may be acceptable subject to Dynamic Earth’s on-site geotechnical engineer’s approval if the contractor is able to achieve the necessary compaction. Dynamic Earth recommends using a smooth drum roller or sheepsfoot roller (where fine-grained soils are encountered) to compact subgrade soils beneath larger areas such as pavements or slabs. Hand operated vibratory jumping jacks and plate compactors should be used in confined excavations for foundations or utilities. Fill material compacted with relatively light weight equipment or in the static mode may require additional passes and/or the material may need to be placed in thinner, loose lifts. Structural Fill Testing: Before filling operations begin, representative samples of each proposed fill material (on-site and imported) should be collected. The samples should be tested to determine the maximum dry density, optimum moisture content, natural moisture content, gradation, and plasticity of the soil. These tests are needed for quality control during compaction and also to determine if the fill material is acceptable. The placement of all fill and backfill should be monitored by Dynamic Earth’s geotechnical engineer or technician to ensure that the specified material and lift thicknesses are properly installed. A sufficient number of in-place density tests should be performed during fill placement to ensure that the specified compaction is

t the specified material and lift thicknesses are properly installed. A sufficient number of in-place density tests should be performed during fill placement to ensure that the specified compaction is achieved throughout the height of the fill or backfill. 5.5 Preliminary Pavement Recommendations The on-site soils are preliminarily expected to be suitable for support of proposed pavements. Due to the reworked onsite material and moisture sensitivity of the on-site soils, at least partial overexcavation and replacement, re-compaction and/or subgrade stabilization should be expected, as detailed throughout this report. Depending on the overall subgrade conditions and weather conditions, more extensive mitigation efforts may be required. If required, a specific pavement section can be provided based on the results of a supplemental geotechnical investigation. SHI Builders 13 4266-99-001E