SHI Builders West Orange NJ Prelim GI SWM Report 1

Estimated Seasonal High Groundwater and Permeability Summary Surface Mottling1 Groundwater Permeability Test Results Location Elevation Depth Depth Depth Permeability (in/hr) Elevation Elevation (ft) (ft) (ft) (in) A B SPP-9 535.2 24 Not Tested Not Encountered Not Encountered SPP-10 525.7 24 Not Tested 1 Where mottling was not encountered, the depth to seasonal high groundwater can be approximated from the soil survey and/or with direct groundwater readings during the wet season. 5.9 Temporary Excavation The soils encountered during the investigation are consistent with Type C Soil Conditions as defined by 29 CFR Part 1926 (OSHA) which require a maximum unbraced excavation angle of 1.5:1 (horizontal: vertical). Actual conditions encountered during construction should be evaluated by a competent person (as defined by OSHA) to ensure that safe excavation methods and/or shoring and bracing requirements are implemented. 5.10 Preliminary Seismic and Liquefaction Considerations The soils are most consistent with a Site Class D defined by the International Building Code. Based on the seismic zone and soil profile, liquefaction considerations are preliminarily not expected to have a substantial impact on design. 5.11 Supplemental Evaluation and Investigation Final Design/Supplemental Investigation: Since these preliminary geotechnical investigation activities have been completed during the initial design phase, many critical assumptions or preliminarily details regarding assumed structural loads, existing and proposed elevations, etc. affect the geotechnical analysis. The preliminary considerations presented herein should be considered to help develop the optimum site design and grading, and Dynamic Earth should remain involved during final design. A supplemental investigation including the advancement of additional soil borings, test pits, and

lop the optimum site design and grading, and Dynamic Earth should remain involved during final design. A supplemental investigation including the advancement of additional soil borings, test pits, and laboratory testing should be performed within building areas as part of the final geotechnical investigation for the site. Dynamic recommends performing supplemental investigation throughout the proposed site once the design layout and grading becomes finalized in order to confirm the recommendations herein and/or provide additional recommendations, if required. Construction Monitoring and Testing: The recommendations presented herein are contingent on the owner retaining Dynamic Earth to perform inspection, testing and consultation during construction as described in previous sections of this report. Construction phase evaluation by means of proofroll inspections, soil probes, and/or subgrade inspections will be needed to confirm adequate support for the proposed structures. Monitoring and testing should also be performed to verify that suitable materials are used for controlled fill, and that they are properly SHI Builders 17 4266-99-001E