J_2024 05 09_West Orange Stormwater Management Plan

10 1 / LEGEND X x X /x I\ W' -600- <y J //, & NOTES: V', DISGHiiffGE' 1. NJ STATE PLANE COORDINATE SYSTEM HORIZONTAL DATUM = NAD-83(2007) VERTICAL DATUM = k) NAVD-88 N X ONLY PSE&G LAND RIGHTS HAVE BEEN SURVEYED. ADJOINING TAX LOTS ARE SHOWN FOR INFORMATION 9 EX-DA 1 ONLY. Ny X DA EX V (• y REFERENCES: EASEMENT LINE - EXISTING MAJOR CONTOUR LINE - EXISTING MINOR CONTOUR LINE - EXISTING FENCE LINE - LIMIT OF DISTURBANCE - DRAINAGE AREA - EXISTING GRASS SURFACE - EXISTING MEADOW SURFACE - EXISTING BRUSH SURFACE - EXISTING GRAVEL DRIVE SURFACE - EXISTING GRAVEL SURFACE - EXISTING YARD STONE SURFACE - IMPERVIOUS SURFACE (BUILDINGS Sc FOUNDATIONS) - EXISTING PAVED SURFACE - DRAINAGE INLET - SOILS // woods ggsfeS oo X -lrn WOODS t’6- X ••• * X XT / URBONB / X f / I EX / /iA . / <7 / ■ / Udbonc ’/■■/■■/it '/■ //■■/ / * - * • . Tj aj , • * • -■ % URBONB I - SOIL DESIGNATION / Ws, TosaVBLDG's .• TWR 5/6 REMOVED. • A / S* •. Y/-. / y ■y . .602 \ X f§p TWR 5/5/ o X. X */ )k~ ■ y X EX-DA 9A /k x s/ / / /X / \/ '\ / ^ / N/ A»\M / a NT BUTARY SX i/ «>„ o X X / \ ♦ r \ l£ , s v/ % Yi X/ V X / / //X X/ / / f? o / o / 7 ¥/ EX-DA 3 / %• X < STING X EX omtainmen. . s <7 ms / n A \ u A *X\ X'*' EX \x - *3 O/v / x> V4; / 7 / / .x / WOODS / 3 /, ♦ c ''' ’O' % / / y. / Vi )NB / / f / f / J T- V / EX DA Sf / V G <G s LX Xs / fc> X. ’to 0 A' rx O// X X X x / / / / / / / -•x 5=, T*2z / i X Li XJ / A rs 626 <37 , 26,372SF GRASS 263,252SF BRUSH 50,888SF NON-CONTRIBUTORY 9,248SF DRAINAGE AREA EX-OA 1 Composite CN = 81, Tc Path = 18.2 min Impervious 11158 Gravel Road 661 Grass 53293 Brush 141S9 Total 79301 DRAINAGE AREA EX-0A 2 Composite CN = 83, Tc Path = 22,9 mitt Impervious 4190 Grass 10038 Brash 3705 Total 17933 DRAINAGE AREA EX*OA 3 Composite CN = 88, Tc Path = 5.0 min Impervious 3042 Gravel Road 35019 Grawi 29686 Grass 30906 Meadow 26372 Total 125025 DRAINAGE AREA EX-DA4 Composite CN = 91, Tc Path = 14,2 min Impervious 31370 Gravel Road 5072 Grave! 12803 Yard stone 8134 Grass 21568 Total 78947 DRAINAGE AREA EX-DA 5 Composite CN = 96, Tc Path = 1.8 min 17517 Impervious Grass 2694 Total 20211 DRAINAGE AREA EX-DA 6 Composite CN = 82, Tc Path

Grave! 12803 Yard stone 8134 Grass 21568 Total 78947 DRAINAGE AREA EX-DA 5 Composite CN = 96, Tc Path = 1.8 min 17517 Impervious Grass 2694 Total 20211 DRAINAGE AREA EX-DA 6 Composite CN = 82, Tc Path =16.9 m i n Imperious 9501 Gravel Road 848! Yard stone 43082 Grass 57041 Brush 27592 Non-Contri bylory 1964 Total '47661 DRAINAGE AREA EX-OA 7 Composite CN = 81, Tc Path = 7.T min Impervious 805 Gravel Road 2198 Yard stone 10157 Grass 86177 Brush 5402 Total 104739 DRAINAGE AREA EX-DA 8 Composite CN = 89, Tc Path s 28,4 min impervious 15912 Yard stone 29261 Grass 1535 Non-Contributory 982 Total 47690 DRAINAGE AREA EX-DA 9A Composite CN = 86, Tc Path = 31.4 min Imperious 1344 Yard slone 20580 Total 21924 DRAINAGE AREA EX-DA 9B Composite CN = 92. Tc Path = 31.0 min Impervious 24703 Gravel 670 Yard stone 20336 Total 45709 / S NO. /'V' 628 REVISION P r~> ^^SOIL NAME DESCRIPTION HSG UdbonB UDORTHENTS, BOONTON SUBSTRATUM, 0 to 8% SLOPES “D" HSG URBONB URBAN LAND. BOONTON SUBSTRATUM, 0 to 8% SLOPES — US80NB URBAN LAND, BOONTON SUBSTRATUM-800NT0N COMPLEX. 0 to 8% SLOPES — SOIL INFORMATION OBTAINED FROM NATURAL RESOURCE CONSERVATION SERVICES (NRCS) U.S. DEPARTMENT OF AGRICULTURE, WEB SOIL MAP FOR UNION COUNTY, NEW JERSEY. SURVEY, w/ NON-CONTRIBUTORY 689,140 SF w/o NON-CONTRIBUTORY 686,194 SF DATE ANALYSIS POINT "A” TABLE STORM EVENT VOLUME (AF) 2 YR 2.684 23.25 10 YR 4.777 41.95 100 YR 9.133 79.82 NJDEP 0.541 10.16 PEAK FLOW (CFS) 80 160 APPLICANT: PSE&G 80 PARK PLACE NEWARK, NJ 07102-4194 ©TRC Engineers Inc. 57 E. WILLOW STREET MILLBURN, NEW JERSEY 07041 PHONE NO. (973) 564-6006 FAX NO. (973)564-6131 Certificate of Authorization #24GA28047100 WEST ORANGE SWITCHING STATION TOWNSHIP OF WEST ORANGE, ESSEX COUNTY, NEW JERSEY TITLE: PRE-DEVELOPMENT DRAINAGE AREA PLAN X / y EX-DA 5 131,550SF MEADOW TOTAL AREA /: / s 43,159 SF YARD STONE / SOio X kx / o / \ -a m // /= X '•is 51,431SF GRAVEL ' /? / m 119,542SF GRAVEL ROADS / X2 / / <7 XN /V / /■fS’A / FOUNDATIONS TWR 5/5^V / V \ \ IMPERVIOUS c/Y PAVED ROADS, BUILDINGS & OO < 2> / \!K / /\JK Areas calculated within the Drainage Area Line: ' <3> / / \ XISTTWRS TO E REMOVED EX-D-A 9B PRE-DEVELOPMENT DRAINAGE AREA SUMMARY 2*, / I we 5/6-1 { sit/ * \v «r> \y . ■**•/■■/■■//'* c&r' LL I I IS / V' ® : X'\ C.A.D.D.

Line: ' <3> / / \ XISTTWRS TO E REMOVED EX-D-A 9B PRE-DEVELOPMENT DRAINAGE AREA SUMMARY 2*, / I we 5/6-1 { sit/ * \v «r> \y . ■**•/■■/■■//'* c&r' LL I I IS / V' ® : X'\ C.A.D.D. UPDATE: A <0 —620_ \“ BARRY J. SUTHERLAND, PE Project No.: 182614 Scale: AS SHOWN Drawn By: JS Date: 02/ 09/2012 Checked By: BJS Drawing No.: NEW JERSEY PROFESSIONAL ENGINEER GE 29135 FOR REVIEW ONLY NOT FOR CONSTRUCTION SOIL APPENDIX B-2 Dote Copyright ©2011 50 UiJtfl wmwtMM > PLOT DATE: S&1tdale$$$‘ 1, -. ^ - Lxxxxxxv/YY \u. i. ROSELAND-METUCHEN R/W LINE ADJOINING PROPERTY LINE \S X RIGHT OF WAY INFORMATION BASED ON SURVEYS PREPARED ' THROUGH FEBRUARY 9, 2011, BY DRESDNER ROBIN, W^TNE, NJ, MASER CONSULTING P.A., HAMILTON, NJ, KELLER & KIRKPATRICK, MORRIS PLAINS, NJ AND FRALINGER ENGINEERING, BRIDGETON, x ■. - X \ NOVEMBER 2010. '. X N\ \\\\' \ - o X\ —595— % A \ 7/ X o 1. PHOTOGRAMMETRIC SURVEY BY PHOTO SCIENCE, INC.g WEST CHESTER, PENNSYLVANIA, DATED MARCH 2009 THRO0GH 11

PSE&G West Orange Switching Station West Orange, NJ Stormwater Management Report Appendix C - Pre-Development HydroCad Results TRC Engineers, Inc. March 2012

7S 8S EX-DA l EX-DA 4S ) EX-DA 13R EX-DA SwaleX EX-C A 10R . 5S 10 CB EX-DA 5 CB^2 to CB- V 15R / Discharge CB-5 to CB-4 6S ) — (new Po 11R EX-DA 6 Am 9A Surface Swale EX-DA 9A ( 9B 2S EX-DA 9B Sub! Analysis Point A Yard Area Ponding Reach Jonc _ EX-DA2 Link Drainage Diagram for Pre-Development West Orange with ponds Prepared by TRC Engineers, Inc., Printed 3/4/2012 HydroCAD® 9.10 s/n 06401 © 2009 HydroCAD Software Solutions LLC

Pre-Development West Orange with ponds 2 Printed Prepared by TRC Engineers, Inc. HvdroCAD® 9.10 s/n 06401 © 2009 HydroCAD Software Solutions LLC 3/4/2012 Page 2 Pipe Listing (all nodes) Line# Node In-Invert Out-Invert Length Slope Number (feet) (feet) (feet) (ft/ft) n Diam/Width Height Fill (inches) (inches) (inches) 0.0 1 10R 592.92 578.50 140.0 0.1030 0.025 12.0 0.0 2 15R 610.00 596.25 245.0 0.0561 0.025 12.0 0.0 0.0 3 10P 590.00 578.00 330.0 0.0364 0.025 12.0 0.0 0.0 4 12P 576.00 574.00 90.0 0.0222 0.011 24.0 0.0 0.0 5 15P 594.92 590.25 220.0 0.0212 0.025 12.0 0.0 0.0 (

Type III 24-hr 2 yr Rainfall=3.42" Printed 3/4/2012 Page 3 Pre-Development West Orange with ponds 2 Prepared by TRC Engineers, Inc. HydroCAD® 9.10 s/n 06401 © 2009 HydroCAD Software Solutions LLC Summary for Subcatchment 1S: EX-DA 1 Runoff = 2.43 cfs @ 12.25 hrs, Volume= Runoff by SCS TR-20 method, Type III 24-hr 2 yr Rainfall=3.42" UH=SCS, Split 0.258 af, Depth= 1.70" Pervious/lmperv., Time Span= 0.00-30.00 hrs, Area (sf) CN Description h h 11,158 661 53,293 14,189 98 98 79 73 Paved road, HSG D Gravel road, HSG D Woods/grass comb., Good, HSG D Brush, Good, HSG D 79,301 67,482 11,819 81 78 98 Weighted Average 85.10% Pervious Area 14.90% Impervious Area Tc (min) Length (feet) Slope Velocity Capacity Description (ft/ft) (ft/sec) (cfs) 16.9 150 0.0270 0.15 Sheet Flow, 1.3 270 0.0520 3.42 Shallow Concentrated Flow, 18.2 420 Total Grass: Dense n= 0.240 P2= 3.42" Grassed Waterway Kv= 15.0 fps Subcatchment 1S: EX-DA 1 Hydrograph 2.43 cfs i■ 01 2 34 - 56 78 L_J _L ; ; Type III 24-hr 2 yr -U-J-i-i Ralnfall=3.42" Runoff Area=79,301 sf Runoff; Volume=0.258 af : Runoff Depth=1.70H : Flow Length=420’ Tc=18.2 min CN=78/98 l*m 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 Time (hours) dt= 0.01 hrs

Pre-Development West Orange with ponds 2 Type III 24-hr 2 yr Rainfall-3.42" Printed 3/4/2012 Page 4 Prepared by TRC Engineers, Inc. HydroCAD® 9.10 s/n 06401 © 2009 HydroCAD Software Solutions LLC Summary for Subcatchment 2S: EX-DA2 Runoff = 0.54 cfs @ 12.32 hrs, Volume= Runoff by SCS TR-20 method, Type III 24-hr 2 yr Rainfall=3.42" UH=SCS, 0.063 af, Depth= 1.85" Split Pervious/Imperv., Time Span= 0.00-30.00 hrs, Area (sf) CN Description ★ * 4,190 10,038 3,705 98 Paved road, HSG D 80 Grass, Good, HSG 73 Brush, Good, HSG D 17,933 13,743 4,190 83 Weighted Average 78 76.64% Pervious Area 98 23.36% Impervious Area Tc (min) Length (feet) 21.8 150 Slope Velocity Capacity (ft/ft) (ft/sec) 0.0400 D Description (cfs) Sheet Flow, 0.11 Woods: Light underbrush n= 0.400 P2= 3.42" 1.1 240 0.0630 22.9 390 Total Shallow Concentrated Flow, 3.76 Grassed Waterway Kv= 15.0 fps Subcatchment 2S: EX-DA2 Hydrograph -I- - i— - H - -J--:-- l_ 0.54 cfs J _ _ I _L _ J _____ I ___ l _ _ l ____ J ______ l _ _l_ - —i — i— r - -t —i — i— i— t —i—i— r L I j- -type Ml 24-hr:2;yr Rainfall=3.42" t- RUrioff Area=17,933 sf • i i i i i i i i i 'i i i i 1 — i— r RunQff;V6lume=0.063: af i-rtunoff Depth=1;.85r J___ I___I___ i_____ • _ _L . Flow Length=390' Tc=22.9|mln -f CN=?8/9$ J —I------ I— I ____ I ___ L . J_____ l___ L _ i______l_ _ i___ I____ I___ •___l_ _ L ____I ____t ____L - J ________ l _ 0 1 2 34 5 . 87 l. _ L _ J ______ I ___ • ___ I 8 .L . J ----------1 ----- I - _ i . ____I _ _l_ _ U _ J _____ l _ _ l 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 Time (hours) dt= 0.01 hrs

Type III 24-hr 2 yr Rainfall=3.42" Printed 3/4/2012 Page 5 Pre-Development West Orange with ponds 2 Prepared by TRC Engineers, Inc. HydroCAD® 9.10 s/n 06401 © 2009 HydroCAD Software Solutions LLC Summary for Subcatchment 3S: EX-DA 3 Runoff = 7.09 cfs @ 12.09 hrs, Volume= Runoff by SCS TR-20 method, Type III 24-hr 2 yr Rainfall=3.42" UH=SCS, Split 0.530 af, Depth= 2.22" Pervious/lmperv., Time Span= 0.00-30.00 hrs, Area (sf) CN Description * * * # 3,042 35,019 29,686 30,906 26,372 98 98 91 80 78 Impervious, HSG D Gravel road, HSG D Gravel, HSG D Grass, Good, HSG D Meadow, non-qrazed, HSG D 125,025 86,964 38,061 88 83 98 Weighted Average 69.56% Pervious Area 30.44% Impervious Area Tc (min) Length (feet) Slope Velocity Capacity Description (ft/ft) (ft/sec) (cfs) 4.0 150 0.0070 0.63 Sheet Flow, Gravel Storage Area 1.6 350 0.0600 3.67 Shallow Concentrated Flow, 5.6 500 Total, n= 0.020 P2= 3.42" Grassed Waterway Kv= 15.0 fps Increased to minimum Tc = 6.0 min Subcatchment 3S: EX-DA 3 Hydrograph —i—i—i—i---- i—i iitii• • j_- 9 cfs 7 !/ /' 2 01 2 34 56 78 Type III 24-hr 2 yr H ; J Rainfall=3.42" Runoff Area=125,025 sf Runoff Volume=0.530 af : : Runoff Depth=2.22M : Flow Length=500‘ • : :Tc=6.0 min CN=83/98 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 Time (hours) dt= 0.01 hrs

Pre-Development West Orange with ponds 2 Type III 24-hr 2 yr Rainfall=3.42" Printed 3/4/2012 Page 6 Prepared by TRC Engineers, Inc. HydroCAD® 9.10 sIn 06401 © 2009 HydroCAD Software Solutions LLC Summary for Subcatchment 4S: EX-DA 4 Runoff = 3.82 cfs @ 12.19 hrs, Volume= Runoff by SCS TR-20 method, Type III 24-hr 2 yr Rainfall=3.42" UH=SCS, 0.374 af, Depth= 2.48" Split Pervious/lmperv., Time Span= 0.00-30.00 hrs, dt= 0.01 Area (sf) CN Description * * * * * 31,370 5,072 12,803 8,134 21.568 98 Paved road, HSG D 98 Gravel road, HSG D 91 Gravel, HSG D 85 Yard stone, HSG D 80 Grass, Good, HSG D 78,947 42,505 36,442 91 Weighted Average 84 53.84% Pervious Area 98 46.16% Impervious Area Tc (min) Length (feet) 12.3 150 0.0600 0.20 0.7 135 0.0460 3.22 Shallow Concentrated Flow, 1.2 310 0.0470 4.40 Shallow Concentrated Flow, Slope Velocity Capacity (ft/ft) (ft/sec) Description (cfs) Sheet Flow, Grass: Dense n= 0.240 P2= 3.42" Grassed Waterway Kv= 15.0 fps Paved Kv= 20.3 fps 14.2 595 Total Subcatchment 4S: EX-DA 4 Hydrograph ---------1 ---- 1 ------ 1 ----- 1 ----- 1 ----- 1 1 ■ • i i i i i i 1 ' - 1 L J - 1 1 1 1 1 1 O QQ _r_ i i i i t i CIS O.OdC. i i i i i i i i jH i i i i i i i i 1 —i—i—i—i—i—r' i t i—i—i—;—i—i—i—i—i— i i i i i i i i 1 ■ ■ - 1 1 1 1 I 1 1 i i i i • i i __1_J i i i i ' _ ________ O2 ____________ t_ __ _.L i 1 i i 1 i i i i i i i i i 1 i 1 i 1 i 1 i 1 i 1 i 1 i 1 i Type III 24-hr; 2 yr Rainfall=3.42,> unoff Area=78,947 sf noff Volume=0.:374 af Runoff Depth-2.48? Flow Length^SS' Tc=14.2min : :CN=84/98 > ^ i i ----- i : - .... 111 |«I ■ 111111‘1111HI ■ ■ I-11111«11111‘11111‘1111I ■ 11‘11111111‘1111 )< I 0 1 2 3 4 56 78 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 Time (hours) hrs