25 10 28 Slope Stability Review

Chairman and Members of the West Orange Planning Board Application No. PB24-01, West Essex Highlands, LLC, Warner Road, Block 179, Lot 32 Review of Applicant’s Engineer’s Slope Stability Analysis Reports, the Objector’s Engineer’s Response Reports; and the Applicant’s Engineer’s Rebuttal Report October 28, 2025 Page 3 of 21 B. Report Entitled “Subsurface Investigation Report, Subsurface Stormwater Management System, West Orange, New Jersey, Report No. 23-C-16” dated May 23, 2023. C. Report Entitled “Subsurface Investigation Report, Subsurface Stormwater Management System, West Orange., New Jersey, Report No. 24-C-02” dated February 12, 2024. (This report contains Test Pit data for the Recharge Basin Design in the Area of Building D and Howell Road Cul de Sac.) D. Report Entitled “Supplementary Subsurface Investigation Report, Subsurface Stormwater Management System, West Orange., New Jersey, Report No. 24-C-02” dated April 4, 2024. 4. Objector’s Engineer’s Reports prepared by Princeton Hydro: A. Letter Report entitled “PB-24-01 West Essex Highlands, Inc. Block 179, Lot: 32 Zone 1H-1, Warner Road, West Orange Township, Essex County” dated March 10, 2025. (This report is primarily a review of Stormwater Management Issues.) B. Letter Reports entitled “Review of Langan Slope Stability Analysis” dated January 14, 2025, revised June 18, 2025, and “PB-24-01 West Essex Highlands, Inc., Block 179 Lot:32: Zone 1H-1” dated July 16, 2025. C. Letter Reports entitled “Further Evaluation of Langan Slope Stability Analysis” dated January 14 2025, revised June 18, 2025, and “PB-24-01 West Essex Highlands, Inc, Block 179 Lot 32: Zone 1H-1, Warner Road” dated August 12, 2025. 5. Drawing Files Submitted to the Planning Board: A. “Proposed Building D , Garden Homes Diagrammatic Site Study Sections” prepared by Appel Group Architects and Issued for Planning Board, 05/09/2023. B. Architectural Drawings entitled “West Essex Highlands Garden Homes” prepared by Appel Group Architects Issued for Planning Board on 12/20/23. C. Drawings entitled: “Preliminary and Final Site Plan, West Essex Highlands. Block 179, Lot 32 and Block 179.17 Lots 8 and 9” prepared by Anderson Consulting Services LLC, originally dated 06/07/2023, revised through 10/01/2024 (per NJDEP comments). 6. Miscellaneous References: A. “Bedrock Geologic Map of the Caldwell Quadrangle, Essex and Morris Counties”

Services LLC, originally dated 06/07/2023, revised through 10/01/2024 (per NJDEP comments). 6. Miscellaneous References: A. “Bedrock Geologic Map of the Caldwell Quadrangle, Essex and Morris Counties” by Richard A Volkert. The relevant section of this Map was included in the Langan report of June 18, 2025, as Figure No. 2 and is attached herewith for ease of reference. B. “Surficial Geology of the Caldwell Quadrangle, Essex and Morris Counties, New Jersey” by Scot D. Stanford, 2005 prepared in cooperation with the U.S. Geological Survey National Geologic Mapping Program. C. Map entitled: “Landslide Susceptibility for Essex County, New Jersey” by Scott D. Standford for the New Geological Society and dated 2001.