251203_42 ERW_Stormwater Report

The test pit logs are presented in Appendix A. Soils encountered were classified in the field in general accordance with the USDA Soil Classification System, a summary of which is presented in Appendix A. Photographs of the test pits are presented in Appendix B. General Groundwater Observations Groundwater conditions were not encountered within the test pits during the time of our onsite presence. Table 1 presents a summary of our observations. Groundwater observations noted above reflect the conditions at the time of our onsite presence. Note that groundwater levels can fluctuate with locations, seasonal changes, precipitation, nearby construction activities, foreign influences such as leakage into and out of utilities, and other factors. Pockets or seams of gravels, sands, silts, or open fractures and joints can store and transmit “perched” groundwater flow or seepage. Seasonal High Groundwater Table Evidence of seasonal high groundwater table was not encountered within the test pits. Table 1. Summary of Groundwater Observations Location Ground Elevation (ft) Measured Groundwater Depth (ft)* Measured SHGW Depth (ft)** TP-101 613± N.E. N.D. TP-102 615.5± N.E. N.D. * N.E.: Not Encountered ** N.D.: Not Detected In-situ Infiltration Testing A total of two in-situ infiltration tests were performed within the test pits at a depth of 3 ft below existing grades. The single ring infiltrometer tests were performed in accordance with Chapter 12 of the New Jersey BMP Manual. A summary of the performed single ring infiltrometer tests is presented in Table 2. Measured Field Intake Rate Appendix C presents the details of the infiltration tests and corresponding results. Table 2 presents a summary of these results. GEOTECHNICAL DATA REPORT | November 25, 2025 Page 2