Geotechnical Engineering Report Addendum No 1 Results of Testing 01 29 2025 submission

Mavis #2296 Additional Exploration January 29, 2025 ECS Project No. 44-2100-A Page 2 The soil profiling and infiltration test program performed was based on the information obtained from our previous subsurface exploration and discussions with Mavis. SUBSURFACE EXPLORATION AND TESTING Our exploration procedures are explained in greater detail in the Attachment 2 in the insert titled Subsurface Exploration Procedure. A rubber tracked excavator was used by Sano Drilling, and the Exploration Location Diagram in Attachment 1 depicts the approximate as-completed locations of the test pit excavations. Soil profiling and field infiltration testing was performed in general accordance with Chapter 12 of the BMP Manual. The Single Ring Infiltration Test (Subsection A5 of the Chapter 12 Appendix) was used. Upon completion of the infiltration testing, the test pits were backfilled with the excavation spoils. The spoils were placed in consecutive, generally horizontal lifts of relatively uniform thickness and tamped with the excavator bucket. Excess spoils were mounded above the backfilled test pit footprint and smoothed and firmed with the excavator bucket. SUBSURFACE CHARACTERIZATION Soils encountered were visually classified during logging on the basis of texture in general accordance with the United States Department of Agriculture (USDA) Textural Classification System per the requirements of the BMP Manual. After classification, the samples were grouped in the major zones noted on the exploration logs contained in the Attachment 2. Divisions between soil strata/soil horizons on the exploration logs are approximate; in-situ, the transitions may be gradual. Additionally, index property tests were performed on select soil samples collected to confirm USDA classifications made in the field. Each laboratory test was completed in general accordance with the applicable ASTM Standard Test Method as indicated on the laboratory testing sheets included in Attachment 3. The subsurface conditions encountered were generally consistent with the published geologic mapping available from the New Jersey Geological and Water Survey via NJ-GeoWeb and the United States Department of Agriculture Natural Resources Conservation Service

stent with the published geologic mapping available from the New Jersey Geological and Water Survey via NJ-GeoWeb and the United States Department of Agriculture Natural Resources Conservation Service (USDA-NRCS) via Web Soil Survey for the general site vicinity. TEST PIT EXISTING GROUND BOTTOM OF FILL APPROXIMATE DESIGNATION SURFACE ELEVATION ELEVATION FILL DEPTH (feet) TP-01 ±619.0 ±617.0 ±2.0 TP-02 ±619.0 ±615.75 ±3.25 TP-03 ±619.0 ±616.0 ±3.0 TP-04 ±618.0 ±617.0 ±1.0 TP-05 ±616.0 ±613.0 ±3.0