12 2026 02 12 Crestmont CC Stormwater Management Report

Stormwater Management Field Testing Results MEMO Eagle Rock Ave and Oval Road Improvements 750 Eagle Rock Avenue, West Orange, New Jersey Langan Project No. - 101049802 25 August 2025 - Page 4 of 4 In accordance with the New Jersey Stormwater Best Practices Manual and the NRCS National Engineering Handbook, Part 630 – Hydrology, Chapter 7 Hydrologic Soil Groups, Table 7-1: Criteria for Assignment of Hydrologic Soil Group, the Hydrologic Soil Group (HSG) has been evaluated at select test pit locations based on the depth to observed groundwater level, observations of soil mottling (an indicator of SHGW), soil gradation, and laboratory tube permeameter testing of select soil samples. Based on this evaluation, the site is classified as Hydrologic Soil Group D. The laboratory testing results are provided in Appendix C and are summarized in Table 1. CLOSURE Our Stormwater Management Investigation was performed to assist our Site/Civil Engineers with the design of the proposed stormwater management system associated with the proposed Eagle Rock Avenue and Oval Road Improvement in West Orange, New Jersey. \\langan.com\data\PAR\data8\101049801\Project Data\_Discipline\Site Civil\Reports\Stormwater\2026-02-12 SWM Report\Appendix F\2025-08-25- Geotech SWM Result Memo.docx = = =