1240815StormWaterManagementReportrcd 3 12 2026

18 412 41 414 41 TOPSOIL 413 6 5 STOCKPILE REFUSE 7 AREA 41 BYPASS 414 1318 SF 416 415 0.03 AC 417 Cn=74 7 41 21 LF SHEET 418 FLOW 10 LF 417

SHEET 418 FLOW 10 LF 417 PROPOSED ADDITION SHEET FLOW 1,790 GROUND FLOOR OFFICE 1,510 1ST FLOOR OFFICE 2.5% 2 APARTMENTS 2ND FLOOR DA1 DA1 PARKING 7266 SF 18 76584 SF 419 0.167 AC 0.176 AC Cn=88 AC Cn=95 AC 419 420 59 LF SHEET FLOW EXISTING AC BUILDING 92 LF 5.0% TO REMAIN AC SHEET FLOW AC 420 15 LF SHEET FLOW

420 15 LF SHEET FLOW 6.7% 421 COV. PORCH 420 421 8 LF San. Manhole 422.48 Rim SHEET FLOW 6 IE 8" Clay S 3 IE 8" Clay N 6.5% 421 42 IE 8" Clay W 422 2 GV 1" GV GV 17 14 San. Manhole 421.70 Rim 414.87 IE 8" Clay S 414.70 IE 8" Clay N PLEASANT VALLEY WAY 575.40'

ay N PLEASANT VALLEY WAY 575.40' Project No.: Calc.By: Page: CASEY & KELLER, INC. 512-516 PLEASANT VALLEY WAY, WEST ORANGE 1240815 JAA 258 MAIN STREET, MILLBURN, NJ 07041 Scale: File Name: Check.By: Date: (973) 379-3280 Fax: (973) 379-7993 PROPOSED DRAINAGE AREA 1" = 20' DA-EXISTING JAA 155 9/11/25