1240815StormWaterManagementReportrcd 3 12 2026

Tax Map Tax Map Tax Map Lot 11.01 Lot 11.02 Lot 37 Chain-Link Fence Chain-Link Fence 18 2.87' over E 3.04' over E S 26°22'0" W 124.83 Tax Map Lot 33 TRASH AREA CO CO Vinyl Fence 0.25' over S PROPOSED ADDITION 1,790 GROUND FLOOR OFFICE

1,790 GROUND FLOOR OFFICE 1,510 1ST FLOOR OFFICE 2 APARTMENTS 2ND FLOOR Tax Map Lot 10 Curb 1.0' Over N AC S 61°58'0" E 130.00' N 62°02'20" W 130.00' Curb Tax Map 1.06' over S AC Lot

Curb Tax Map 1.06' over S AC Lot 13 EXISTING AC BUILDING TO REMAIN AC AC 419.64tc 419.35bc CO Point of BEGINNING CO IP Found San. Manhole 0.05' E 422.48 Rim 413.66 IE 8" Clay S

0.05' E 422.48 Rim 413.66 IE 8" Clay S 413.53 IE 8" Clay N S 26°22'0" W 124.99 413.46 IE 8" Clay W 1" GV Curb GV GV 421.89tc 421.41bc 1.78' over S GV 421.85bc 421.78bc 421.60bc 421.50bc 421.12bc 421.01bc 420.98bc 421.03bc 422.03tc 422.10tc 421.98tc 421.86tc 421.61tc 421.42tc 421.89tc 421.85bc 421.78bc 421.60bc 421.50bc 421.12bc 421.03bc 420.89bc

421.78bc 421.60bc 421.50bc 421.12bc 421.03bc 420.89bc San. Manhole 421.70 Rim 12" 414.87 IE 8" Clay S 290' SIGHT DISTANCE 414.70 IE 8" Clay N 136 PLEASANT VALLEY WAY Project No.: Calc.By: Page: CASEY & KELLER, INC. PLEASANT VALLEY WAY, WEST ORANGE 1240815 JAA 258 MAIN STREET, MILLBURN, NJ 07041

1240815 JAA 258 MAIN STREET, MILLBURN, NJ 07041 Scale: File Name: Check.By: Date: (973) 379-3280 Fax: (973) 379-7993 PIPE CALCULATIONS 1" = 30' PROFILES 12/5/25

VI Vi SCOUR HOLE SCOUR HOLE CALCULATIONS CALCULATIONS 138 137 138

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12/12/2025 Casey & Keller, Inc. LAND surveyors + civil engineers + PLANNERS N.J. STATE BOARD OF PROFESSIONAL ENGINEERS & LAND SURVEYORS CERTIFICATE OF AUTHORIZATION NO. 24GA27985400 258 Main Street, Millburn, NEW JERSEY, 07041 voice :973-379-3280 fax: 973-379-7993 Job # 1240815 Job Name: 512-516 Pleasant Valley Way Structure: SCOUR 1 Designed by: TF Checked by: JAA Q= 2.22 C.F.S. W o= 1.00 FT. D o= 1.00 FT. q=Q/W o= 2.22 C.F.S. TW= 0.20 FT. (For areas where Tw cannot be computed, use Tw = 0.2Do) d50 Stone size formula Where Y = 1/2 Do d50 =0.0125 * q^1.33 = 0.18 Ft. 3 " STONE USED TW 0.50 Ft. = Y 6 " = T (Use filter fabric) 9 " = T (No filter fabric) d50 Stone size formula Where Y = Do d50 =0.0082 * q^1.33 = 0.12 Ft. 3 " STONE USED TW 1.00 Ft. = Y 6 " = T (Use filter fabric) 9 " = T (No filter fabric) Y = Depth of scour hole below culvert invert, T = Thickness of riprap L = 3 Do = 3.00 Ft.

= Depth of scour hole below culvert invert, T = Thickness of riprap L = 3 Do = 3.00 Ft. W = 2 Wo = 2.00 Ft. If Y = 1/2Do Total L = 6.00 , Total W = 5.00 If Y = Do Total L = 9.00 , Total W = 8.00 T = d50 Stone size x 2 if filter fabric is used T = d50 Stone size x 3 if no filter fabric is used STRUCTURE SCOUR 1 DESIGN SUMMARY FALSE Total L = 6' L= 3' TRUE Total W = 5' W= 2' FALSE Depth of scour hole (Y) = 0.5 ' FALSE d50 Stone size = 3" Thickness of riprap (T) = 6" L:\2024\12408\1240815\Reports-Calcs\Drainage Reports\SCOUR1 139 139