251203_42 ERW_Stormwater Report

Introduction In accordance with our proposal dated August 15, 2025, Colliers Engineering & Design, Inc. (CED), performed a subsurface exploration program for the proposed stormwater infiltration facilities in support of the proposed development located at 42 Eagle Ridge Way, Township of West Orange, Essex County, New Jersey. The program was undertaken to explore the infiltration characteristics of the soils at locations selected by the Site Civil Engineer. This report presents a summary of the data collected during CED’s field presence and the results of the performed in-situ infiltration tests. Available Information 1. Drawing titled, “Preliminary and Final Major Site Plan for 42 Eagle Ridge Way”, by Colliers Engineering & Design, dated October 18, 2024. Site and Project Description The project site is located at 42 Eagle Ridge Way, Township of West Orange, Essex County, New Jersey. The site is identified as Block 106, Lot 24.01 on the corresponding tax map. Eagle Ridge Way bounds the site towards Northwest. A residential development is located on the northeast side of the site. Wooded areas are located along the southeast and southwest sides of the side. The site is currently a vacant lot. Surface grades generally slope downward from El. 626± towards West to El. 612± towards East. We understand stormwater management facilities are proposed on the east side of the site. Stormwater Subsurface Exploration CED performed a subsurface exploration program consisting of two test pits, TP-101 and TP-102, within the footprint of the proposed stormwater management facilities. The test pits were performed at locations selected by the Site Civil Engineer and extended up to 6 ft below existing surface grades where bedrock was encountered. Our representative located the test pits based on existing site features and handheld GPS equipment. Drawing B-01-ELP presents the locations of the test pits. The test pits were performed by Grabowski Construction, Inc. of West Orange, New Jersey, on August 28, 2025, under a direct contract with the client. The test pits were performed under the continuous observation of CED representative, Mr. Francisco Sanchez-Dominici, PE. The test pits were backfilled upon completion. Subsurface Conditions Soil Stratification The site soils were exposed at the surface at the test pit locations. Soils encountered within the test pits generally

pits were backfilled upon completion. Subsurface Conditions Soil Stratification The site soils were exposed at the surface at the test pit locations. Soils encountered within the test pits generally consist of silt loam/silt clay loam, varying amounts of sand/gravel/boulders. The test pits were terminated due to refusal encountered on bedrock at depths of up to 6 ft below existing grades. GEOTECHNICAL DATA REPORT | November 25, 2025 Page 1