26 03 25 CME Engineering Review 2

ENGINEERS A Subsidiary of Artheon, Inc. —— Ove en & Municipal MASSOCIATES Chairman and Members of the West Orange Township Zoning Board March 25, 2026 Re: Mavis Tire Supply, LLC (ZB-25-07) Our File No. 115.WRZ0105.V01 (60001) Preliminary & Final Major Site Plan with ‘C’ & ‘D’ Page 8 Variances and Tree Removal Permit - Review #2 24. The ‘Doghouse B Inlet Detail’ on sheet 14 and ‘Type B Inlet’ on sheet 15 should be revised to include a N-Eco Curb Piece. 25. The ‘Outlet Control Structure #2 Detail’ on sheet 15 must be revised to provide a trash rack on the 0.6’ weir. 26. The ‘Outlet Control Structure #2 Detail’ on sheet 15 shows a 2.5” PVC pipe in the structure noting “Stopcock gate to be closed for normal operations”. The Applicant must clarify the purpose of this pipe. 27. There is a discrepancy between the sand layer callout and Note #2 on the ‘Bioretention System Detail’ on sheet 15 regarding the required thickness of the sand layer. This discrepancy must be resolved. 28. The ‘Bioretention System Detail’ on sheet 15 includes a callout for a 6” gravel layer. However, the detail shows 3” of stone under the underdrain pipe and 6” of stone above the underdrain pipe. Therefore, the thickness of the stone must be 6” plus the O.D. of the underdrain pipe. This discrepancy must be revised. 29. The ‘Bioretention System Detail’ on sheet 15 should be revised to note the size and type of underdrain pipe that is proposed. 30. The ‘Bioretention System Detail’ on sheet 15 should be revised to note that the gravel layer must 0.5 inch to 1.5 inch clean, broken stone or pea gravel. 31. The ‘Bioretention System Detail’ on sheet 15must be revised to include a note which states “To ensure proper system operation, the permeability rate of the gravel layer must be at least twice the design permeability rate of the sand layer’. 32. The ‘Bioretention System Detail’ on sheet 15 should be revised to specify the minimum permeability rate required for the soil planting bed and the sand layer. 33. The ‘Bioretention System Detail’ on sheet 15 should be revised to note the elevation of the bottom of the gravel layer. 34. The ‘Bioretention System Detail’ on sheet 15 should be revised to provide specifications for the soil planting bed which complies with Chapter 9.7 of NJ BMP manual. 35. The ‘Bioretention System Detail’ on sheet 15 should be revised to provide a note

d be revised to provide specifications for the soil planting bed which complies with Chapter 9.7 of NJ BMP manual. 35. The ‘Bioretention System Detail’ on sheet 15 should be revised to provide a note which states that “The soil bed material must be placed in lifts not to exceed 6 inches. Additional materials may be necessary to account for settling over time.” 36. The ‘Bioretention System Detail’ on sheet 15 should be revised to include a note which states that “The minimum density of vegetation within the system is 85%.” 37. The ‘Underground Basin Outlet Control Structure’ Detail on sheet 16 should be revised to show the proposed height of the 4’ weir and the vertical distance from the top of slab (elev. 617.75) to the bottom of the 8” reinforced concrete lid. 38. The ‘Underground Basin Outlet Control Structure’ Detail on sheet 16 shows that the invert of the 48” pipe will be at elevation 617.75 whereas the ‘48” HDPE Schematic Underground HiLegacy\Howel-FS1\SEC\West Orange\Zoning Board\ 15 WRZ0105 VO! - Mavis Tire Supply, LLC\26-03-25 Review #2 docx