2025 06 18 WEH Slope Stability Analysis Letter Report

MEMO Global Slope Stability Study for Building D West Essex Highlands Project Langan Project No.: 101049801 Revised 18 June 2025 Revised 18 June 2025 - Page 2 of 13 Services, LLC. (ACS), the closest building to the subject slope is proposed Building D, which is to be located at the top of the slope within the study area approximately 700 ft west of the eastern property line and approximately 150 ft southwest of the northernmost residence on Howell Drive. We understand that no site improvements are proposed in the wooded subject area located approximately 20 ft east of the proposed eastern building line of Building D. An emergency access road connected to the existing Howell Drive cul-de-sac is also proposed as part of the construction. Based on the proposed grading plans, we understand the proposed construction of Building D and the associated access road will not include any grade changes from the existing conditions immediately east. The lowest proposed level will range from elevation (el) 607 to el 582 which will require cuts up to about 25 ft from existing surface grade in some isolated areas. The lower structured parking level for Building D will be nested into the eastern slope with adjacent grades east of the proposed building remaining unchanged. The building will be supported on shallow foundations bearing on natural soils or rock. A site location map showing the approximate limits of the study area and proposed Building D is provided below and as Figure 1. PROPOSED EMERGENCY ACCESS ROAD HOWELL DRIVE PROPOSED BUILDING D LOCATION APPROXIMATE SUBJECT SLOPE AREA (WOODED) N ROSEMONT TERRACE 700 FT +/EXISTING SEWER EASEMENT APPROXIMATE TOP OF SLOPE MAYFAIR DR APPROXIMATE BOTTOM OF SLOPE Proposed Study Area Site Map REGIONAL GEOLOGY According to the available geological maps we reviewed, the upper portion of the subject slope is underlain by the Preakness Basalt, which is a hard fine-grained igneous rock. The lower portion