13026 Resubmission

Geotechnical Engineering Investigation Report JMA02P003.05- 08/19/2025 262-270 Main St • Predominant overburden soils, consistent with the local geology, comprised of silt. ○ For preliminary benching and excavation design considerations, overburden soils may be considered as “Type C” material in terms of OSHA’s soil classifications and should be sloped no steeper than 1½H:1V (horizontal to vertical). ○ Classification and maximum permissible temporary excavation slope angles should be confirmed by the contractor’s “competent person” prior to excavation activities. ○ Any proposed shoring or excavation support systems should be designed by the contractor’s “competent person” and certified by a Professional Engineer licensed in the State of New Jersey. 4.8 Dewatering It should be noted that soils were observed to be saturated as deep at approximately eighteen (18) feet below grade at the time of the investigation program. As such, dewatering of excavations is not anticipated. Notwithstanding, the Contractor should perform their own location-specific investigation prior to construction to confirm groundwater conditions and that appropriate in-the-dry construction conditions are met. If needed, Hudson Engineering anticipates that localized dewatering can be achieved with traditional wellpoint or similar methods. Water should be discharged away from prepared subgrade and compacted fill surfaces. Surface grading should be accomplished to intercept and divert runoff away from excavations, prepared subgrade, and compacted fill surfaces. 4.9 Subgrade Preparation Prior to installation of shallow concrete foundations, Hudson Engineering recommends over excavating the subgrade by at least six (6) inches, lining the exposed material with a geotextile separation fabric, and bringing the subgrade back up to the design foundation elevation with compacted structural fill as specified within Table 5. Native material beneath the separation fabric should be inspected for unsatisfactory conditions such as standing water, frozen soil, organics, or deleterious materials. Should any unsatisfactory conditions exist within the native subgrade, the excavation should be undercut an additional four

ons such as standing water, frozen soil, organics, or deleterious materials. Should any unsatisfactory conditions exist within the native subgrade, the excavation should be undercut an additional four (4) inches (10 total inches beneath proposed foundation depth) prior to placement of the geotextile separation fabric. 4.10 Backfill Hudson Engineering notes that native soils with appreciable fine-grained content (more than 15 percent passing No. 200 Sieve), where encountered, will likely be difficult to handle, place, and compact without proper moisture conditioning and protection. These soils may be re-used across the project area for fill in landscaped areas; however, it should not be used under or above foundations or load-bearing structures where typically imported structural fill is used. Native material used as backfill for cable trenches should be handled and placed at a moisture content at or above its optimum value to ensure representative thermal properties are maintained. In areas around and above installed foundations, large utilities, and other buried site features, native material, with less than 15 percent fine-grained content (passing No. 200 Sieve), may be used as general backfill; otherwise, imported granular material should be used. General backfill material should not be used beneath any load-bearing structures and should be placed in loose lift thicknesses not exceeding 12 inches and be compacted to at least 95 percent of its Modified Proctor Density (ASTM D1557). Soil used as backfill should not be handled when frozen and should be free of excessive moisture, organics, and deleterious material. In areas beneath foundations and load-bearing structures, Hudson Engineering recommends structural fill as described in Table 5. Table 5: Recommended Gradation of Structural Fill Sieve Size Percent Passing 3-inch 100 1½-inch 60-100 6