SHI Builders West Orange NJ Prelim GI SWM Report 1

REPORT OF PRELIMINARY GEOTECHNICAL AND STORMWATER BASIN AREA INVESTIGATION PROPOSED RESIDENTIAL SUBDIVISION 2 & 10 Ridge Road Block 80.03, Lots 10 and 21 Township of West Orange, Essex County, New Jersey Prepared for: SHI Builders 74 Bellevue Avenue Summit, New Jersey 07901 Prepared by: 245 Main Street, Suite 110 Chester, New Jersey 07930 Patrick Granitzki, P.E. Francis Van Cleve. P.E. Senior Principal Principal NJ PE License No. 24GE05355900 NJ PE License No. 24GE05534500 Project #4266-99-001E June 8, 2022

REPORT OF PRELIMINARY GEOTECHNICAL AND STORMWATER BASIN AREA INVESTIGATION Proposed Residential Subdivision 2 & 10 Ridge Road Block 80.03, Lots 10 and 21 Township of West Orange, Essex County, New Jersey TABLE OF CONTENTS 1.0 EXECUTIVE SUMMARY .......................................................................... 1 2.0 PROJECT DETAILS ................................................................................. 1 3.0 SCOPE OF SERVICES ............................................................................... 2 3.1 Field Investigation..................................................................................................2 3.2 Laboratory Testing Program .....................................................................................3 4.0 SUMMARY OF SUBSURFACE CONDITIONS .............................................. 4 4.1 Site Geology .........................................................................................................4 4.2 United States Department of Agriculture (USDA) Web Soil Survey ...................................4 4.3 Subsurface Soil Profile.............................................................................................6 4.4 Seasonal High Groundwater and Groundwater .............................................................7 5.0 PRELIMINARY CONCLUSIONS AND RECOMMENDATIONS ...................... 7 5.1 General ................................................................................................................8 5.2 Preliminary Shallow Foundation Design Recommendations.............................................8 5.3 Preliminary Floor Slab Recommendations.................................................................. 10 5.4 Preliminary Earthwork Considerations ..................................................................... 10 5.5 Preliminary Pavement Recommendations .................................................................. 13 5.6 Preliminary Groundwater Considerations .................................................................. 14 5.7 Preliminary Retaining Walls and Lateral Earth

........................ 13 5.6 Preliminary Groundwater Considerations .................................................................. 14 5.7 Preliminary Retaining Walls and Lateral Earth Pressure Recommendations ...................... 14 5.8 Seasonal High Groundwater and Soil Permeability ...................................................... 16 5.9 Temporary Excavation .......................................................................................... 17 5.10 Preliminary Seismic and Liquefaction Considerations................................................... 17 5.11 Supplemental Evaluation and Investigation ................................................................ 17 6.0 GENERAL COMMENTS AND LIMITATIONS ............................................ 19 SHI Builders i 4266-99-001E

REPORT OF PRELIMINARY GEOTECHNICAL AND STORMWATER BASIN AREA INVESTIGATION Proposed Residential Subdivision 2 & 10 Ridge Road Block 80.03, Lots 10 and 21 Township of West Orange, Essex County, New Jersey TABLE OF CONTENTS APPENDICES Test Location Plan Records of Subsurface Exploration Laboratory Test Results USDA-NRCS Custom Soil Resources Report for Essex County, New Jersey Geotechnical Terms and Symbols USCS Standard Classification System SHI Builders ii 4266-99-001E

1.0 EXECUTIVE SUMMARY Dynamic Earth, LLC (Dynamic Earth) has completed a preliminary geotechnical investigation and stormwater basin area investigation for the proposed site development located at 2 and 10 Ridge Road in the Township of West Orange, Essex County, New Jersey. Based on the results of our field investigation, conventional shallow foundations and ground supported floor slabs bearing on structural fill material (where site grades are raised), natural soils and/or underlying weathered rock are expected to be feasible for the proposed site development. However, portions of the on- site soils included existing fill material. As such, project planning should include at least partial overexcavation and replacement of the existing fill material. Relatively shallow weathered rock and rock and oversized cobbles/boulders were encountered during our subsurface exploration. As such, depending on final site grading plans, project planning should include the need for difficult excavation to remove weathered rock/rock and oversized materials. Due to the subsurface conditions encountered, Dynamic Earth should remain involved as the design progresses to review the potential impacts to the recommendations detailed herein and/or provide supplemental recommendations for the proposed development. 2.0 PROJECT DETAILS The subject site is located at 2 and 10 Ridge Road in the Township of West Orange, Essex County, New Jersey and is further identified as Block 80.03, Lots 10 and 21. The site is bound to the north and to the east by Mount Pleasant Avenue with residential property beyond; to the south by residential property; and to the west by Ridge Road with commercial property beyond (Brookdale West Orange). The site of the proposed construction is shown on the attached Test Location Plan. At the time of Dynamic Earth’s investigation, the majority of the site was a heavily wooded parcel. Existing stone/brick retaining walls were located within the eastern portion of the site. The proposed site development will include the construction of a residential subdivision with approximately four to five single-family homes with associated pavements and utilities the location and size of the residential homes were not provided. Stormwater management facilities are planned throughout the subject site. Proposed site development details were provided on an April 8,

e location and size of the residential homes were not provided. Stormwater management facilities are planned throughout the subject site. Proposed site development details were provided on an April 8, 2022 Conceptual Plan ‘A’ prepared by Dynamic Engineering Consultants, PC (Dynamic). While site grading plans were not developed at this time, we preliminarily assume typical earth cuts and fills on the order of approximately five to seven feet will be required as part of the site development. Topographic information was provided on a May 11, 2022 ALTA/NSPS Land Title Survey prepared by Dynamic Survey, LLC. Existing site elevations range between approximately 625.0 feet within SHI Builders 1 4266-99-001E

the central portion of the site and 507.0 feet within the eastern portion of the site. The elevations provided in this report reference the 1988 North American Vertical Datum (NAVD 88), unless otherwise noted. Structural loads were not developed at this time; however, based on our experience with similar projects, the proposed structures are expected to be masonry and wood-framed structures constructed with a concrete slab-on-grade and may include basement levels. The maximum loads are assumed to be less than the following:  Wall – 1.0 kip per linear foot;  Column – 50 kips; and  Floor Slab – 50 pounds per square foot. 3.0 SCOPE OF SERVICES 3.1 Field Investigation Field exploration for this investigation was conducted by means of two soil borings (identified as borings B-1 through B-2), ten soil profile pits (identified as SPP-1 through SPP-10), and five structural test pits (identified as TP-1 through TP-5). The borings were drilled using hollow stem auger drilling techniques with an all-terrain vehicle (ATV) mounted drill rig and the soil profile pits/test pits were excavated with a rubber-tire backhoe. Test locations are summarized in the following table and are shown on the accompanying Test Location Plan included within the Appendix of this report. TEST LOCATION SUMMARY TABLE Number Proposed Location Final Depth (feet) B-1 Northwestern Portion of Site 20.7 1 B-2 Central/Eastern Portion of Site 9.8 1 SPP-1/TP-1 Southwestern Portion of Site 6.3 1 TP-2 Western Portion of Site 12.0 1 SPP-2 Northwestern Portion of Site 11.7 1 SPP-3 Central/Eastern Portion of Site 9.8 1 SPP-4/TP-3 Southern Portion of Site 11.9 1 SPP-5 4.8 1

Southern Portion of Site 11.9 1 SPP-5 4.8 1 Central portion of Site SPP-6 3.3 1 SPP-7/TP-4 Central/Northern Portion of Site 3.9 1 SPP-8/ TP-5 Northeastern Portion of Site 11.5 1 SPP-9 5.9 1 Eastern Portion of Site SPP-10 4.0 1 1 Refusal encountered within underlying weathered rock and/or very dense glacial deposits SHI Builders 2 4266-99-001E

The soil borings, soil profile pits, and test pits were completed in the presence of a Dynamic Earth engineer who performed field tests, recorded visual classifications, and collected samples of the various strata encountered. The test locations were located in the field using conventional taping procedures with estimated right angles, and are presumed to be accurate within several feet of the location plotted on the plans. Soil borings and standard penetration tests (SPTs) were conducted in general accordance with ASTM D6151 (Standard Practice for Using Hollow-Stem Augers for Geotechnical Exploration and Soil Sampling). Standard penetration tests (SPTs) were conducted in general accordance with ASTM D1586 (Standard Test Method for Standard Penetration Test and Split Barrel Sampling of Soils). The SPT resistance value (N) is used in conjunction with many correlations which relate to blow count, or SPT N-value to engineering behavior of soils to develop foundation and earthwork recommendations. The soils encountered within the area of the proposed/anticipated stormwater management areas were classified using the United States Department of Agriculture (USDA) Classification System. Observations were made for groundwater and/or soil mottling and mineral deposits potentially indicative of zones of saturation or seasonal high groundwater. The results of our preliminary stormwater basin soils area investigation are included herein. Groundwater level observations were recorded during and at the completion of field operations prior to backfilling the borings. Seasonal variations, temperature, anthropogenic activities, seasonality, soil permeability, and precipitation will influence the actual and observed groundwater levels. Groundwater elevations derived from sources other than seasonally observed groundwater monitoring wells may not be representative of true groundwater levels. A Phase I Site Assessment was also completed by Dynamic Earth and was issued under an April 18, 2022 Phase I Environmental Site Assessment. 3.2 Laboratory Testing Program Physical/Textural Analysis: Each sample was visually classified in general accordance with ASTM D2488. In addition, representative samples of selected strata encountered were subjected to a laboratory testing program which included, moisture content determinations (ASTM D2216), Atterberg limits (ASTM D4318),

ition, representative samples of selected strata encountered were subjected to a laboratory testing program which included, moisture content determinations (ASTM D2216), Atterberg limits (ASTM D4318), and washed gradation analyses (ASTM D6913) in order to perform supplementary engineering soil classifications in general accordance with ASTM D2487 (Unified Soil Classification System). The results of the laboratory testing are summarized in the following table: SHI Builders 3 4266-99-001E