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Home My WebLink AboutContract 58239 Date Received: 10/14/2022 Permit No.: SWFMA-22-0057 Time Received: 4:51 pm City Secretary No.: 58239 STORMWATER FACILITY MAINTENANCE AGREEMENT THIS AGREEMENT, made and entered into this 12th day of October 2022, by and between Landmark at Rendon in Fort Worth, LLC, acting by and through Julia Baytler, its duly authorized manager, hereinafter referred to as "Landowner", and the City of Fort Worth, hereinafter referred to as "City". WITNES SETH WHEREAS, the Landowner is the owner of certain real property on a tract of land situated in the H. Little Survey, Abstract 930, Tarrant County, Texas and being a portion of that called 23.037 acre tract of land described by deed to Landmark at Rendon in Fort Worth, LLC, recorded in County Clerk's File Number D221109559, Deed Records, Tarrant County, Texas, hereinafter called the "Property". WHEREAS, the Landowner is proceeding to build on and develop the Property according to the Site Plan/Subdivision Plan known as Landmark at Rendon (CPN 103718 and SWM-2021-0068), hereinafter called the "Plan", which is expressly made a part hereof, as approved or to be approved by the City and the Landowner provides for management of storm water within the confines of the Property; and; WHEREAS, the City and the Landowner, and their successors and assigns, agree that the health, safety and welfare of the residents of the City of Fort Worth, Texas require that on-site Stormwater Management Facilities be constructed and maintained on a portion of the Property; and OFFICIAL RECORD CITY SECRETARY FT.WORTH, TX STORMWATER FACILITY MAINTENANCE AGREEMENT 1 Rev.03/01/2022 BN WHEREAS, the City requires that on-site Stormwater Management Facilities ("Facility") as shown on the Plan be constructed and adequately maintained by the Landowner, its successors and assigns, the location and dimensions of which is shown and more particularly described by metes and bounds in the attached Exhibit "A" ("Facility Property"); and NOW, THEREFORE, in consideration of the foregoing premises, the mutual covenants contained herein, and the following terms and conditions, the parties hereto agree as follows: 1. The Landowner, its successors and assigns, shall adequately construct and maintain the on-site Stormwater Management Facility ("Facility") at no expense to the City of Fort Worth in accordance with the design specifications for the Facility, attached as Exhibit"B", and the current standards then in force and effect in the City of Fort Worth and with the Operations and Maintenance Plan attached to this Agreement as Exhibit "C". The Stormwater Facility includes all pipes, channels or other conveyances built to convey Stormwater to the facility, as well as all structures, improvements, and vegetation provided to control the quantity and quality of the Stormwater. Adequate maintenance is herein defined as good working condition so that these facilities are performing their design functions. The Stormwater Structural Control Maintenance Checklists, attached to this Agreement as Exhibit "D", are to be used to establish what good working condition is acceptable to the City. 2. The Landowner, its successors and assigns, shall inspect the Facility and submit an inspection report to the City annually. The purpose of the inspection is to assure safe and proper functioning of the Facility. The inspection shall cover the entire Facility, berms, outlet structure, pond areas, access roads, etc. Components of the Facility, which need maintenance or replacement to perform their design function, shall be noted in the inspection report along with the corrective actions to be taken. STORMWATER FACILITY MAINTENANCE AGREEMENT 2 Rev.03/01/2022 BN 3. The Landowner, its successors and assigns, hereby grant permission to the City, its authorized agents and employees, to enter upon the Property and to inspect the Facility Property whenever the City deems necessary. The purpose of inspection is to follow-up on reported deficiencies and/or to respond to citizen complaints. The City shall provide the Landowner, its successors and assigns, copies of the inspection findings and a directive to commence with the repairs if necessary. 4. In the event the Landowner, its successors and assigns, fails to maintain the Facility in good working condition as specified herein, the City, its authorized agents and employees, may enter upon the Facility Property and take whatever steps necessary to correct deficiencies identified in the inspection report and to charge the costs of such repairs to the Landowner, its successors and assigns. It is expressly understood and agreed that the City is under no obligation to routinely maintain or repair said Facility, and in no event shall this Agreement be construed to impose any such obligation on the City, such obligation is Landowner's. 5. The Landowner, its successors and assigns, will perform the work necessary to keep the Facility in good working order as appropriate. In the event the City pursuant to this Agreement, performs work of any nature, or expends any funds in performance of said work for labor, use of equipment, supplies, materials, and the like, the Landowner, its successors and assigns, shall reimburse the City upon demand, within thirty (30) days of receipt thereof for all actual costs incurred by the City hereunder. In the event that Landowner or its successors or assigns fail to pay the City for the costs incurred under this section, the City shall impress a lien for the costs of such work upon other lots owned by the Landowner. Such lien shall be perfected by filing in the office of the County Clerk of Tarrant County, Texas an affidavit identifying the property to be charged with such lien, stating the amount thereof, and making reference to this Agreement. 6. This Agreement imposes no liability of any kind whatsoever on the City. THE LANDOWNER AGREES TO HOLD THE CITY HARMLESS FROM STORMWATER FACILITY MAINTENANCE AGREEMENT 3 Rev.03/01/2022 BN ANY LIABILITY IN THE EVENT THE FACILITY FAILS TO OPERATE PROPERLY. LANDOWNER COVENANT AND AGREE AND DOES HEREBY INDEMNIFY, HOLD HARMLESS AND DEFEND THE CITY OF FORT WORTH, ITS AGENTS, SERVANTS AND EMPLOYEES FROM AND AGAINST ALL COSTS, EXPENSES, LOSSES, DAMAGES, CLAIMS OR CAUSES OF ACTION WHATSOEVER ARISING, OR WHICH MIGHT ARISE, FROM THE FAILURE OF LANDOWNER OR ANY FUTURE OWNERS OF THE ABOVE FACILITITY PROPERTY TO MAINTAIN THE FACILITY, INCLUDING, BUT NOT LIMITED TO THE BED AND BANKS OF THE DETENTION POND; ANY DAMAGES CAUSED TO PERSON OR PROPERTY DUE TO (1) FLOODING OF THE POND AND ITS BANKS, (2) SLOPE FAILURE OF THE BANKS OF THE POND, OR (3) FAILURE OF THE POND OR ITS BANKS TO OPERATE IN A MANNER CONSISTENT WITH CITY OF FORT WORTH CRITERIA TO PERFORM ANY OTHER DUTIES OR OBLIGATIONS HEREUNDER. 7. Landowner covenants and agrees that no habitable building shall be erected within the drainage easement outlined on Exhibit "A" but this paragraph shall not preclude construction of other improvements within the drainage easement, which do not impede drainage. Landowner covenants and agrees that no habitable building shall be erected on the above property abutting such easement which shall have a finished floor at an elevation less than two feet above the maximum depth of water in the detention pond which would occur during a 100-year frequency flood. 8. This Agreement shall be recorded among the land records of Tarrant County, Texas, shall constitute a covenant running with the land, and shall be binding on the Landowner, its administrators, executors, assigns, heirs and any other successors in interests, including any property owner's association. STORMWATER FACILITY MAINTENANCE AGREEMENT 4 Rev.03/01/2022 BN Executed this 12th day of October 2022 CITY OF FORT WORTH LANDOWNER Dana Burgh doff(Oc 12,20221 :57 CDT) Dana Burghdoff Landmark at Rendon in Fort Worth LLC Assistant City Manager a Florida limited liability company City of Fort Worth By: Rendon Residential Partners,LLC, Date: Oct 12, 2022 a Texas limited liability company, its sole member and manager By: Landmark Developments,LLC Approved as to Form and Legality: a Florida limited liabilitycompany ig r and manager Thomas Royce Hansen,Assistant City Attorney II City Attomey's Office Date: Oct 12, 2022 Date: y ol7 2)' ATTEST: yannel tel S. Goodall Contract Compliance Manager: Jannette S.Goodall(Oct 13,202216:41 CDT) Jannette S. Goodall By signing, I acknowledge that I am the City Secretary person responsible for the monitoring and administration of this contract, Date: Oct 13, 2022 including ensuring all performance and reporting requirements. a� FORT a 001 00000 O41 0 Dwayne Hold s for(Oct 12,202213:46 CDT) V o S= Janie Scarlett Morales °000 Development Manager Ici ��TEX Asap Date: Oct 12 2022 OFFICIAL RECORD CITY SECRETARY STORMWATER FACILITY MAINTENANCE AGREEMENT Rev.03/01/2022 BN FT. WORTH, TX STATE OF TEXAS § COUNTY OF TARRANT § This instrument was acknowledged before me on Oct. 12, 2022 by Dana Burghdoff,Assistant City Manager of the City of Fort Worth,on behalf of the City of Fort Worth. Digitally signed by Bichson Bichson Nguyen BICH SON THI NGUYEN Nguyen Date:2022.10.1301:18:17 1�9 Notary Public -05'00' STATE OF TEXAS Notary I.D. 133389224 Notary Public, State of Texas My Comm.Exp.Oct. 13,2025 STATE OF D x-/9 A § COUNTY OF § BEFORE ME,the undersigned authority, a Notary Public in and for the State of 9D/+ i3O.4 , on this day personally appeared ��. (name), /L (title),known to me to be the person whose name is subscribed to the foregoing instrument, and acknowledged to me that he/she executed the same for the purposes and consideration therein expressed, as the act and deed of f,� e/ ma 0 �- / Me a�h (entity), a c (entity type) and in the capacity therein stated. GIVEN UNDER MY HAND AND SEAL OF OFFICE this day 0 0 ,20_g,�l Nota blic, State of o 2r bs9- Id 'USS'IJFJON 16.7114 42r)OA41 P+PU01 K0i'O(JVW saJldx3•ww03 RWti '•.. f9fL160Nuoisslwwo) OFFICIAL RECORD @PNoli to al>7S•)pQnd tigoN f.: STORMWATER FACILITY MAINTENANCE AGREEMENT SON'�'l1 vmmyHor !a �, CITY SECRETARY Rev.03/01/2022 EN FT. WORTH, TX EXHIBIT "A" INSERT LEGAL DESCRIPTION STORMWATER FACILITY MAINTENANCE AGREEMENT 7 Rev.03/01/2022 BN POINT OF COMMENCING 5/8"CIRF Called 137.881 Acres \ "BROOKS BAKER" Jimmy Purselley and 1 Joyce M. Purselley Volume 12167,Page 434 Line Table of D.R.T.C.T. Line# Length Direction L6 43.09 N89°43'59"E L7 36.12 N47° 15'33"E I Lot 1,Black 1 it\ a POINT OF Haynes Heights BEGINNING Addition Cabinet B,Slide 2124 P.R.T.C.T. LIS \ - - S7655,56� 19 SS2 f 5.47' Lf Zane"AE" o Zane"X Shaded" ca�� Tract 2 \- . i Detention Acres 5grp� h�— 'one 1Xy 26n ea„ ,i (46,128.62 Sq.Ft.) N / d • Z Called 23.037 Acres Landmark at Rendon 0 N90*00'00"W 5� in Fort Worth, LLC 1 116.57' CCF 4 D221109559 / D.R.T.C.T. I i � D.R.E.C.T.=Deed Records,Ellis County,Tess METES AND BOUNDS P.R.E.C.T.=Plat Regards,Ellis C—Irty,T— Tract 2 CCF#=County Clerk's File Number P0B=Paint of Beginning = BEING a 1.059 acre tract of land situated in the H.Little Survey,Abstract Number 930,Tarrant County, POC Paint of Commencing Texas and being a portion of that called 23.037 acre tract of land described by deed to Landmark at Rendon in Fort Worth,LLC,recorded in County Clerk's File Number D221109559,Deed Records,Tarrant County, Texas and being more particularly described by metes and bounds as follows: COMMENCING at a 5/8 inch iron rod with cap stamped"BROOKS BAKER"found at the northwest corner of said called 23.037 acre tract,said iron rod also being on the west line of a called 137.881 acre tract of land described by deed to Jimmy Purselley and Joyce M.Purselley,recorded in volume 12167 page 434,Deed Records,Tarrant County,Texas; THENCE South 07 degrees 18 minutes 49 seconds East,231.56 feet,departing said west line and over and across said called 23.037 acre tract to a paint for comer and the POINT OF BEGINNING; THENCE over and across said called 23.037 acre tract the fallowing bearings and distances: North 89 degrees 43 minutes 59 seconds East,43.09 feet,to a paint for corner; South 76 degrees 55 minutes 56 seconds East,195.47 feet,to a paint for comer; North 47 degrees 15 minutes 33 seconds East,36.12 feet,to a paint for corner; SCALE : 1n= 100' South S2 degrees 17 minutes 39 seconds East,73.27 feet,to a point for corner; South 56 degrees 50 minutes 59 seconds West,112.48 feet,to a point for corner; 0' 100, 200' South 49 degrees 58 minutes 54 seconds West,147.20 feet,to a point for corner; North 90 degrees 00 minutes 00 seconds West,116.57 feet,to a point for corner; North 01 degrees 25 minutes 24 seconds East,220.53 feet,to the POINT OF BEGINNING and .0 F T� containing 46,128.62 square feet or 1.059 acres of land,more or less. P \STE f Lo �� RF�'.9n JEREMY K Notes 569s 9 -QF�SS,IO�P�O 1.The basis of bearings is the Texas Coordinate System, S U R I F North American Datum of 1983,North Central Zone,4202. 2.This exhibit was prepared from and on-the-ground field survey of the subject property. Manhard City ofxFoirrttiLANDMARK 1187 Worrth,Tarrant Ca nty,DTexas hi CONSULTING PROJ.MGR.: JLD Pond B 505 Pecan Stree[,Suite 201.Fart Worth.Texas 75102 ph'.513.597.5005 ma I—d.— DRAWN BY: MDM Civil Englneers I Surveyors I Water Resource Engineers I Water&Waste Water Engineere 08/02/22 Rev 09/15/22 Exhibit A Cons truc[Ion Managers I Environmental Scient is[s I Landscape Architects I Planners DATE: Texas Board of Professional Engineers and Land Surveyors Re gisft.t—No.F-22053 SCALE: ©2022 MANHARD CONSULTING, LTD, ALL RIGHTS RESERVED _ POINT OF / BEGINNING POINT OF _ COMMENCING ` 5/8"CIRF Z N�3.9 66 N "BROOKS BAKER" _ 8 moo, 1 / 1Doe o� R ,aa 1-1 r, Called 137.881 Acres Jimmy Purselley and �? Joyce M. Purselley toy Volume 12167,Page 434 co, D.R.T.C.T. ---- W 1 � 5/8"CIRF awl. "BROOKS BAKER" h N Line Table Line# Length Direction � n o L1 65.04 S80'33'46"W Called 23.037 Acres `IV Landmark at Rendon Co Tract 1 ! ;3 L2 52.87 S721 33'16"E in Fort Worth, LLC 2 Detention Pond O L3 12.66 S76°07'59"E 2.099 Acres CCF# D2211D9559 (91,425.87 SC.F, i .40 L4 115.12 N701 29'45"W M D.R.T.C.T. fq LS 1 28.59 N20D 24'34"W I � \ 3 N 4S030 IRS -L10 W 77� d 10 L 17 S4 cD '^ D.R.E.C.T.=Deed Records,Ellis County,Texas P.R.E.C.T.=Plat Records,Ellis County,Texas L CCF#=County Clerk's File Number OJ 4\ f/1 POB=Point of Beginning A L POC=Point of Commencing METES AND BOUNDS Tract 1 BEING a 2.099 acre tract of land situated in the H.Little Survey,Abstract Number 930,Tarrant County, Texas and being a portion of that called 23.037 acre tract of land described by deed to Landmark at Rendon in Fort Worth,LLC,recorded in County Clerk's File Number D221109559,Deed Records,Tarrant County, Texas and being more particularly described by metes and bounds as follows: COMMENCING at a 5/8 inch iron rod with cap stamped"BROOKS BAKER"found at the northeast corner of said called 23.037 acre tract; THENCE South 80 degrees 33 minutes 46 seconds West,65.04 feet,over and across said called 23.037 acre tract to a point for corner and the POINT OF BEGINNING; THENCE South 20 degrees 17 minutes 59 seconds East,75.52 feet,to a point for corner; THENCE South 72 degrees 33 minutes 16 seconds East,52.87 feet,to a point for corner in the east line of said called 23.037 acre tract; SCALE : 1"= 100' THENCE along said east line the following bearings and distances: South 07 degrees 18 minutes 03 seconds East,97.75 feet,to a 5/8 inch iron rod with cap stamped "BROOKS BAKER"; D' 100' 200' South 13 degrees 52 minutes 31 seconds West,272.85 feet,to a 5/8 inch iron rod with cap stamped "MANHARD CONSULTING"; OF l South 76 degrees 07 minutes 59 seconds East,12.66 feet,to a point for corner; �Q- ,�• j SiERF�y THENCE departing said east line and over and across said 23.037 acre tract the fallowing bearings and ........... distances: ._._...._l........ distances: JEREM U D ' South 17 degrees 26 minutes 44 seconds West,72.78 feet,to a paint for corner; •.• 5696 4z- ss o e o North 70 degrees 29 minutes 45 seconds West,115.12 feet,to a point for corner; S U R`I North 74 degrees 50 minutes 30 seconds West,111.54 feet,to a point for corner; North 17 degrees 26 minutes 44 seconds East,420.45 feet,to a point for corner; Notes North 20 degrees 24 minutes 34 seconds West,28.59 feet,to a point for corner; 1.The basis of bearings is the Texas Coordinate System, North American Datum of 1983,North Central Zane,4202. North 73 degrees 28 minutes 44 seconds East,89.66 feet to the POINT OF BEGINNING and containing 91,425.87 square feet or 2.099 acres of land,more or less. 2.This exhibit was prepared from and on-the-ground field survey of the subject property. T A-DETENTION Hanhard City ofx Fort iLANDMARK 1187 D Worth,Tarrant County, CONSULTING PROJ.MDR. JLD I Pond D 505 Pecan Stree[,Suite 201..Fart Worth.Texas 76102 PI,313.597.500a ma I—d.— DRAWN BY: MDM Civil Engineers I Surveyors I Water Resource Engineers I Water&Waste Water Engineers 08702722 Rev 09715/22 Exhibit A Cons[ruc[Ion Managers I Environmental Scientists I Land sca Pe Architects I Planners DATE: Texas Board of Professional Engineers and Land Surveyors Regisiratlon N..F-22053 I SCALE: �"=1DD• ©2022 MANHARD CONSULTING, LTD, ALL RIGHTS RESERVED 3 D.R.E.C.T.-Deed Records,Ellis County,Texas P.R.E.C.T.=Plat Records,Ellis County,Texas /� CCF#=County Clerk's File Nurnber �4 50 3 IRS POB=Paint of Beginning -L10 W POC=Point of Commencing 111 C 17 54 ^� rry n� L4 � Called 137.881 Acres L8 Tract Jimmy Purselley and Detention Pend D0 0.787 Acres J Joyce M. Purselley �� -0: I(34,287.44 Sq Ft) Volume 12167,Page 434 Called 23.037 Acres CO D.R.T.C.T. Landmark at Rendon w , in Fort Worth, LLC a CCF# D221109559 cN D.R.T.C.T. o IRS POINT OF Z I BEGINNING — — —------------------— ------- — — N773038,W — — 393.10' IRS POINT OF E. Rendon Crowley Road COMMENCING F.M.High�Nay No.1187) Variable Width Right-of-Way Lot 1,Block 1 Called 36.919 Acres Tarrant County Public 36/Mikie Venture,a Works Department Texas General Precinct 1 Addition Partnership D190146013 D195085652 P.R.T.C.T. D.R.T.C.T. I Line Table METES AND BOUNDS Line#Length Direction Line# Length Direction Tract 3 L8 85.01 N85'07'52"W L14 84.86 S45°28'23"E BEING a 0.787 acre tract of land situated in the H.Little Survey,Abstract Number 930, L9 85.76 N001 00'00"E L15 57.01 S451 12'35"W Tarrant County,Texas and being a portion of that called 23.037 acre tract of land described by deed to Landmark at Rendon in Fort Worth,LLC,recorded in County Clerk's L10 40.19 N900 00'00"E L16 61.08 N450 53'DD"W File Number D221109559,Deed Records,Tarrant County,Texas and being more L11 76.67 S740 54'32"E L17 85.89 S250 33'47"W particularly described by metes and bounds as follows: L12 122.67 S58-04'47E L18 60.65 N90-00'DD"W COMMENCING at a 5/8 inch iron rod with cap stamped"MANHARD CONSULTING"found at I L13 142.22 S18-43'51"W the southeast comer of said called 23.037 acre tract; Notes THENCE North 77 degrees 30 minutes 38 seconds West,393.10 feet,over and across said called 23.037 acre tract to a point for corner and the POINT OF BEGINNING; 1.The basis of bearings is the Texas Coordinate System, North American Datum of 1983,North Central Zone,4202. THENCE continuing over and across said called 23.037 acre tract the following bearings and distances: 2.This exhibit was prepared from and on-the-ground field survey of the subject property. North 00 degrees 29 minutes 49 seconds East,166.48 feet,to a point for corner; North 85 degrees 07 minutes 52 seconds West,85.01 feet,to a point for corner; North 00 degrees 00 minutes 00 seconds East,85.76 feet,to a point for corner; •O F. TF North 90 degrees 00 minutes 00 seconds East,40.19 feet,to a point for corner; coP.��\STE,pFo 9� South 74 degrees 54 minutes 32 seconds East,76.67 feet,to a point for corner; ."'"'"'"'""JEREMY K'."' "".'.'"'" E South 58 degrees 04 minutes 47 seconds East,122.67 feet,to a point for corner; = 5696 e South 18 degrees 43 minutes 51 seconds West,42.22 feet,to a point for corner; O S U South 45 degrees 28 minutes 23 seconds East,84.86 feet,to a point for corner; South 45 degrees 12 minutes 35 seconds West,57.01 feet,to a point for corner; North 45 degrees 53 minutes 00 seconds West,61.08 feet,to a point for corner; South 25 degrees 33 minutes 47 seconds West,85.89 feet,to a point for corner; North 90 degrees 00 minutes 00 seconds West,60.65 feet to the POINT OF SCALE: 1"= 100' BEGINNING and containing 34,287.44 square feet or 0.787 acres of land,more or less. 0' 100, 200' T A-DETENTION M a n h a rd City ofx Fort iLANDMARK 1187 C Worth,Tarrant County, CONSULTING PROJ.NOR.: JLD Pond E 505 Pecan Street,Suite 201.Fart Worth.Texas 76102 ph'.513.597.5005 ma I—d.com DRAWN By: MDM Civil Engineers I Surveyors I Water Resource Engineers I Water&Waste Water Engineers 08/02/22 Rev 09/15/22 Exhibit A Construction Managers I Environmental Scientists I Land sca Pe Architects I Planners DATE: Texas Board of Professional Engineers and Land Surveyors Registration No.F-22053 SCALE. 1"=1QD ©2022 MANHARD CONSULTING, LTD, ALL RIGHTS RESERVED EXHIBIT "B" DESIGN PLAN AND SPECIFICATIONS a \ a \ LIMITS OF FLOODPLAIA 'AE' \ I � DETENTION POND 'B' AREA DRAINS �f TO POND D �Z a C=0.65 A=7.67 ac 1 Tr=lOmin K1=1.00 11=4.06 in/hr Q1=20.24cfs DETENTION K5=1.00 - POND 'D' 15=5.74 in/hr AREA DRAIN I Q 0028.25cfs TO POND EIS K C=0.65 --� 1100=9.24 in/hr rl /a 1 A=3.08 ac la, Q10o=57.58cfs To=lOmin K1=1.00 11=4.06 in/hr Q1=12.40cfs K5=1.00 DETENTION, 15=5.74 in/hr POND 'E' Q5=17.54 cfs K100=1.25 o 1100=9.24 in/hr Q100=35.29cfs AREA DRAINS TO POND E C=0.65 K5=1.00 A=1.73 ac 15=5.74 in/hr Te=10min Q5=11.49 cfs K1=1.00 K100=1.25 11=4.06 in/hr 1100=9.24 in/hr Q1=8.13 cfs Q10D=23.12 cfs LEGEND onw.x axoc N OF P° 0 �QO Q00 SCALE: 1"=250' O2D19 MANHARD CONSULTING, LTD. ALL RIGHTS R-S-RVE' QM EXHIBIT B an a r LANDMARK AT RENDON (SWM-2021-0068) CONSULTING DRAINAGE BASIN MAP 12225 Greenville Avenue,Suite 1000,Dallas.TX 75243 ph:972.972.4250 manhard.com DRAWN BY: DATE: SCALE: CPN: Civil Engineers I Surveyors I Water Resource Engineers I Water&Waste Water Engineers Constr.c[ion Managers 1 Environmental Scientists I Landscape Architects I Planners SJM 2022-{18-30 1"=250' 103718 Texas Board of Professional Engineers Registration No. F-18141 Pond B - Exhibit B A110 _ (OOP Nq Sp' y `� 48" PRIVATE �� `� `� STORM PROP. 15' DRAINAGE ESMT. (DOC. NO. XXXXX) A ` ��'j `°� �� •. 36" PRIVATE STORM m 12" PRIVATE SECTIO O ` STORM — A—A t.-- <o. ::I:, 48" PRIVATE 1 � 1 STORM a : DETENTION POND 36 PRIVATE : : OUTFALL STORM �.�� REFER TO DETAIL c ::a:::.... (SHEET 9 OF 9) 36" PRIVATE _ STORM � _ _7 — 18" PRIVATE STORM —I }wx x �a 0 0 601 Ew L) V) U O - Q o LE:/`1„=60'// ©2019 MANHARD CONSULTING, LTD. ALL RIGHTS RESERVED _ EXHIBIT B (1 OF 9) t4anhard LANDMARK AT RENDON (SWM-2021-0068) CONSULTING DETENTION POND B PLAN 12225 Greenville Avenue,Suite 1000,Dallas,TX 75243 ph:972.972.4250 manhard.com DRAWN BY: DATE: SCALE: CPN: Civil Engineers I Surveyors I Water Resource Engineers I Water&Waste Water Engineers Construction Managers 1 Environmental Scientists I Landscape Architects I Planners SJM 2022-08-30 1"=60' 103718 Texas Board of Professional Engineers Registration No. F-18141 Pond B - Exhibit B +50 0+00 1+00 2+00 3+00 3+ 675 g5 670 670 EXISTING GRADE 665 I ,s 665 17 5—YR WSEL-68 +• 17 1—YR WSEL-662.00 i 10 —YR ULTIMATE 660 2.0x =s5788 660 CR EK FLOOD STUDY) 655 655 AT 0.50% (PRIVATE) 658+50 0+00 1+00 2+00 3+00 3+00 LINE " A- A" H : 1 $$ = 60' V: 1 " = 6 ' ©2019 MANHARD CONSULTING, LTD. ALL RIGHTS RESERVED _ EXHIBIT B (2 OF 9) hjHanhard LANDMARK AT RENDON (SWM-2021-0068) CONSULTING OUTFALL FOR POND B AND SECTION A 12225 Greenville Avenue,Suite 1000,Dallas.TX 75243 ph:972.972.4250 manhard.com DRAWN BY: DATE: SCALE: CPN: Civil Engineers I Surveyors I Water Resource Engineers I Water&Waste Water Engineers Construction Managers I Environmental Scientists I Landscape Architects I Planners SJM 2022-08-30 1"=60' 103718 Texas Board of Professional Engineers Registration No. F-18141 Pond B - Exhibit B 679+50 0+00 1+00 2+00 2+�g5 670 670 EXISTING GRADE 665 0, _ , = 665 17 5-YR WSEL=663.00 �s o 1-YR WSEL=662.00 7 660 �2.0X— 660 PROPOSED GRADE 658+50 0+00 1+00 2+00 2+50 5 LINE "B - B " H : 1 " = 60' V: 1 " = 6 ' ©2019 MANHARD CONSULTING, LTD. ALL RIGHTS RESERVED _ EXHIBIT B (3 OF 9) t4anhard LANDMARK AT RENDON (SWM-2021-0068) CONSULTING DETENTION POND B PROFILE B-B 12225 Greenville Avenue,Suite 1000,Dallas,TX 75243 ph:972.972.4250 manhard.com DRAWN BY: DATE: SCALE: CPN: Civil Engineers I Surveyors I Water Resource Engineers I Water&Waste Water Engineers Construction Managers 1 Environmental Scientists I Landscape Architects I Planners SJM 2022-08-30 1"=60' 103718 Texas Board of Professional Engineers Registration No. F-18141 Pond B - Exhibit B -0+50 0+00 1+00 1+50 665 665 PROPOSED CONDITIONSQM TERSHFn Qlpp-52.20 CFS 125.28 CIF Qpp-353.4 CFS Ql`rP—353.4 Cf VIGO-2.98 qo 3.84 f DIm-0.84 FT Df�=0.97 FT n -0.04(rip-rap) n-0.04(rip- ) EXISTING GRADE 660 130 YR WSEL 660 655 PROPOSED GRADE 655 -0+50 0+00 1+00 1+50 OVERFLOW ROUTE 1 H: 1" = 6 0' V: 1" = 6' -0+50 0+00 1+00 670 PROPOSED CONDITIONS 670 Oloo=38.70 CFS Duo 0.50 FT W-35.00 FT C-3.0 0 o PROPOSED GRADE 665 TOP Q, 66580 665 4:1 (TYP) 660 660 -0+50 0+00 1+00 POND B-E.S. H: 1" = 6 0' V: 1" = 6' ©2019 MANHARD CONSULTING, LTD. ALL RIGHTS RESERVED _ EXHIBIT B (4 OF 9) t4anhard LANDMARK AT RENDON (SWM-2021-0068) CONSULTING DETENTION POND B OVERFLOW ROUTE 1 12225 Greenville Avenue,Suite 1000,Dallas,TX 75243 ph:972.972.4250 manhard.com DRAWN BY: DATE: SCALE: CPN: Civil Engineers I Surveyors I Water Resource Engineers I Water&Waste Water Engineers Construction Managers I Environmental Scientists I Landscape Architects I Planners SJM 2022-08-30 1"=60' 103718 Texas Board of Professional Engineers Registration No. F-18141 Pond B - Exhibit B STA 80.54 LINE INSTALL: "OUTFACE-3" STA 0+99.22 LINE "OUTFALL-3" 1 - STD. 5'x5' Y-INLET INSTALL: � �� FG = 661.21 1 - TxDOT 12" PSET-SC FL 36"=657.33 (NE) FG = 658.76 , FL 12"=657.91 (W) FL 12"=658.00 (E) STA 0+14.34 LINE "OUTFALL-3" INSTALL: z' PROP. 12" STORM 1 - TxDOT 36" CH-FW-O AT 0.50% PRIVATE FG = 660.58 is (PRIVATE) ... .... .. » FL 36"=657.00 (SW) PROP. 36" STORM AT 0.50% (PRIVATE) 1+50 1+00 0+00 —0+50 M � 675 N W 3 675 a add d � U n _ 670 1 ��, J1- �g 670 a a a yl yl yl Z Z Z 6 6 5 PROPOSED GRADE 665 EXISTING 660 `BADE 660 N T 66' 3 "-STORM 655 655 zap y M Cf O 0 30 60 120 650 W co ° 650 II II � II M N M SCALE: 1"=60' 647 `' 647 ©2019 MANHARD CONSULTING, LTD. ALL RIGHTS RESER1+50 1+00 0+00 —0+50 _ EXHIBIT B (5 OF 9) Hanhard LANDMARK AT RENDON (SWM-2021-0068) CONSULTING OUTFALL FOR DETENTION POND B 12225 Greenville Avenue,Suite 1000,Dallas,TX 75243 ph:972.972.4250 manhard.com DRAWN 6V: DATE: SCALE: CPN: Civil Engineers I Surveyors I Water Resource Engineers I Water&Waste Water Engineers Construction Managers I Environmental Scientists I Landscape Architects I Planners SJM 2022-08-30 1"=60' 103718 Texas Board of Professional Engineers Registration No. F-18141 Pond B - Exhibit B LEGEND I — � INLET PROTECTION _' �❑ CONCRETE WASHOUT X SILT FENCE EN CONSTRUCTION \V A V ANCE 660 PROPOSES MAJOR CONTOURS �� v -- �� 682 PROPOSES MINOR CONTOURS ' PROP. 'v SILT FENCE 11111011111011111 CONTROL NWM 1. THE EROSION CONTROL PLAN HAS BEEN PREPARED TO PROVIDE MEANS TO PREVENT OR MINIMIZE POLLUTION OF STORM WATER. 2 THE CONSTRUCTION ACTIVITY INCLUDED IN THIS PLAN WILL INCLUDE: 2.1.1. CLEARING AND GRUBBING 2.1.2. ROUGH GRADING 2.1.3, FINAL GRADING 71.4. UTILITY INSTALLATION 21.& PAVEMENT INSTALLATION 2.1.6. BUILDING CONSTRUCTION 3. THE TOTAL ESTIMATED LAND AREA TO BE DISTURBED IS 20.96 ACRES. \ 4. THE ESTIMATED RUNOFF COEFFICIENT UPON COMPLETION OF THE PROJECT IS 1 m I \ \5. THE STORM WATER IXITING THE SITE DRAINS TO AN EXISTING DRAINAGE SYSTEM \ MAINTAINED BY THE CITY OF GRAND PRAIRIE. 1 � \ 6. THE SOILS ON THE SITE ARE GENERALLY. 1 I 7. THE CONTRACTOR SHALL PROVIDE AND MAINTAIN EROSION PROTECTION AROUND I ( THE WORK AREA PERIMETER AND AT ALL INLET MOUTHS PRIOR TO COMMENCING WORK AND UNTIL THE WORK AREA HAS BEEN STABILIZED. PROP, B. THE CONTRACTOR WILL REMOVE ALL EXCESS SOIL FROM CONSTRUCTION VEHICLES PRIOR TO EXITING THE SITE CHECK DAM 9. ALL DISTURBED AREAS WHICH WILL NOT BE RE—DISTURBED FOR A MINIMUM OF 1 1 1 21 DAYS MUST BE STABILIZED BY THE CONTRACTOR TO CONTROL EROSION. """" "' / 10.THE CONTRACTOR SHALL UNDERTAKE PROPER METHODS TO REDUCE DUST / 1 GENERATION FROM THE SITE 1 .,>� 11.THE CONTRACTOR MUST COMPLY WITH FEDERAL STATE AND LOCAL REGULATIONS a . / �� REGARDING SEDIMENT AND EROSION CONTROL 12 A COPY OF THIS PLAN MUST BE KEPT AT THE CONSTRUCTION FACILITY DURING THE ENTIRE CONSTRUCTION PERIOD. • 13,CONSTRUCTION SEQUENCING MUST PROVIDE FOR THE EXCAVATION OF AN ON—SITE BASIN AS A SEDIMENT COLLECTION BASIN PRIOR TO THE DISTURBANCE OF GREATER THAN 10 ACRES OF LAND. 14.ALL FINISHED GRADES ARE TO BE HYDROMULCHED,SPOT SODED OR SEEDED / �:•:� AND WATERED UNTIL GROWTH IS ESTABLISHED ON AND OFF—SI7�. / 1S A PIT OR WASH OUT BASIN SHALL BE CONSTRUCTED ON—SITE BY THE CONTRACTOR FOR THE"WASH OUT"OF CONCRETE TRUCKS. PROP. INLET — __ 16.A BERM OR OTHER SPILL PROTECTION MEASURE SHALL BE USED FOR ANY ' PROTECTION TEMPORARY FUEL STORAGE TANK ON SITE I ( Y 17.IF'SUMP"PUMPS ARE USED TO REMOVE WATER FROM EXCAVATED AREAS, FILTER THE DISCHARGE TO REMOVE SEDIMENT AND OTHER POLLUTANTS BEFORE THE WATER LEAVES THE SITE 18, TO PREVENT DAMAGE TO VEGETATION IN DOWNSTREAM WATER COURSES,LIMIT 1 _ PROP. INLET ANY PROPOSED LIME STABILIZATION OPERATIONS TO THAT WHICH CAN BE MIXED PROTECTION AND COMPACTED BY THE END OF EACH WORK DAY.GEOTEXTILE FABRIC IS NOT .t EFFECTIVE IN FILTERING UME SINCE THE GRAIN SIZE IS SMALLER THAN THE _ OPENING IN THE FABRIC. 11 19.VEHICLE PARKING AREAS STAGING AREAS,STOCKPILES,SPOILS,ETC.SHALL BE PROP. LOCATED SUCH THAT THEY WILL NOT ADVERSELY AFFECT STORM WATER JILT FENCE __ 1 MEASURES WILL OTHERWISE. OR ENCIRCLING THE AREAS WITH PROTECTIVE 1 20.STORE ALL TRASH AND BUILDING MATERIALS WASTE IN AN ENCLOSURE UNTIL PROPER DISPOSAL AT THE APPROPRIATE OF—SITE FAgLITIES. / 21.TRACKING OF SEDIMENT OFF SITE BY TRUCK TRAFFIC SHALL BE HANDLED THROUGH REGULAR CLEANING. \ 22.INSPECTION SHALL BE CONDUCTED BY THE PERMITEE ONCE EVERY 2 WEEKS PROP. INLET AND WITHIN 24 HOURS AFTER A STORM EVENT 1 22.1.1. DISTURBED AREAS OF THE SITE THAT HAVE NOT BEEN STABILIZED, PROTECTION 221.2 AREASSED FOR PRECIPITATION STORAGE OF MATERIALS THAT ARE EXPOSED TO 22.1.3. STRUCTURAL CONTROL MEASURES, \ / / 22.1:4, LOCATIONS WHERE VEHICLES ENTER OR EXIT THE SITE,AND 22.1.5. IDENTIFICATION OF MEASURES THAT NEED TO BE MAINTAINED,MODIFIED, \ I OR ADDED TO CORRECT PROBLEMS 23.CONTRACTOR SHALL PREVENT THE DISCHARGE OF BUILDING MATERIALS,LIME, CEMENT,CONCRETE,ASPHALT,AND MORTAR TO THE MS 4 OR TO THE WATERS OF THE UNITED STATES 24.PERMANENTLY STABILIZE EXPOSED SOIL WITHIN AND ADJACENT TO THE SITE, THAT IS DISTURBED BY VEHICLES,GRADING,AND OTHER CONSTRUCTION 0 40 80 160 ACTIVITIES. 25.CONTAIN ALL RUNOFF FROM MATERIAL USED IN SUBGRADE STABILIZATION. 26.MATERIAL STOCKPILES SHALL BE COVERED BY PLASTIC OR SURROUNDED BY EROSION CONTROL STRUCTURES TO CONTROL SEDIMENT RELEASES. 27.A CERTIFICATE OF OCCUPANCY WILL NOT BE GRANTED UNTIL THE AREA IS p RESTORED WITH 90X VEGETATIVE COVERAGE. SCALE: 1 =8 0� 28.WHERE CURB INLETS ARE ADJACENT TO DRIVES AND STREETS ACTIVE TO VEHICU IS TO BE ©2019 MANHARD CONSULTING, LTD. ALL RIGHTS RESERVED PROVIDEDRNSTAEAD oFFIC FH THE ISTANDARRTY OF D�CONCRETE BLLET OCK INLET PROTECTION.PROTECTION. _ EXHIBIT B (6 OF 9) Hanhard LANDMARK AT RENDON (SWM-2021-0068) CONSULTING DETENTION POND B EROSION CONTROL PLAN 12225 Greenville Avenue,Suite 1000,Dallas,TX 75243 ph:972.972.4250 manhard.com DRAWN 6Y: DATE: SCALE: CPN: Civil Engineers I Surveyors I Water Resource Engineers I Water&Waste Water Engineers Construction Managers I Environmental Scientists I Landscape Architects I Planners SJM 2022-08-30 1"=80' 103718 Texas Board of Professional Engineers Registration No. F-18141 Pond B - Exhibit B R.aw: W MIN. 13' STEEL OR WOOD POST AT Ir o e 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 ° �T01I 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 Z 00000000000 0 0 0 0 0 0 00000 0 0 0 0 0 0 WOOD-OW OR 3'MN.DUL 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 = 0000000000000 0 0 0 0 0 o 000 0 0 0 o 0 o paSING STEEL 133 LBS Ifl °00000°0°0°0°0°0°0°0°0°0°0°o°o°o° ° pAypplT t� 0 0 0 00000000 0 0 0 0 0 0 0 0 0 o 0 o 0 0 o°o° °o°o°o°o°o°o°o°o°o°o°o°o°o°o 0 0 0 0 0 0 0 0 0 0 o 0 0 0 0 0 0 o WWE FABRIC(10 DA.LINE WIRES MN. ROCK 12 1/2 GA.NIE11611 E WWWS MN.) II ITEM a03.3 'TYPE A RIPRAII PLAN VIEW 7RIW97M TO MIRAFI 10Os OR APPROVED EQUAL PAVED SURFACE MOM MISC IN SW W MIN. 7IMCK FBACCII&COCOMII OItADE TO PREVENT RUNOFF FROM LEAVNO SIZE EXW-M FLOW oQO0000a000Qa000000000Qoo0o00°p000o PAVEYEIiT 00 00 0 0° 00 00° 00° 00°00000 FLIER FABRIC d UNDERLBER a'MN. y EIOS7N0 OROlI1D AP m�1EGUZ _s HOL MIADE TO DM AWAY ROM PROFILE STABALIZATION AID STREET PAVED SILT FENCE SURFACE DRAINAGE War FLOW AWAY FROM ENTRANCE NOT TO SCALE STABALIZED CONSTRUCTION ENTRANCE 1 NOT 70 SCALE 1 �, CONCRETE BLOCKS ww SCREEN 0 1-1/2'FLIER 0 0 00 SIO}E 0 LESS TNAN low bfi SLOPE DROP INLET L nw am wiooMaos° aa arias QSI OMO[SOaI y mN M WY00 RR 0= WO�76 11��I+ L IiOI!�1 AL S�=tM A�0111 S NAIM �� mi swao IL s ioacir Mwft �Ms ar<ra irar aw I✓OIaS W M1701 1910 N�IOiMM M M m le w 110P��Y� SECTION SECTION A-A alas anal ��a1A�I I�wlrw x wI a�aS �aMil i yea w DROP INLET a 10♦aloo FAD 4111 Sle v SML iaioro AIO a AOMMILT. awW 41gaS lLIBt IASOD 6 M taa R■aandraqS�MS a m O O O°O°O° O°O O O � AIASOIIIiqu SISIOI�AMa OMAa 0 0 0 0 0 0 0 0 0 0 E WL�w10[Ip CROSS SECTION to S a�w• O OO ll tFAM ��MO M0:M0�MIOi RRITSM O OO O 1-1/�'' °.0O° FLIER STONE O O° O° NISM A °O °O A AS0101®� °O°11 °O°O ACC D 60)000 O 00 °° I�OIOIt O 0' O CONCRETE °o o BLOCKS O °° .1 O O 1/YX1/4' °O O O O O O 07 O O°O ■RE SCREEN o°O°O°O°O°O°O°O°O°O°O RWW►ABaO MCIOS•i 0 0 0 0 0 0 E I w�aa PLAN VIEW ISOMETRIC PLAN %AEw 5 ROCK BERM 3 DROP INLET PROTECTION NOT TO SCALE ©2019 MANHARD CONSULTING, LTD. ALL RIGHTS RESERVED _ EXHIBIT B (7 OF 9) t4anhard LANDMARK AT RENDON (SWM-2021-0068) CONSULTING DETENTION POND B EROSION CONTROL DETAILS 12225 Greenville Avenue,Suite 1000,Dallas,TX 75243 ph:972.972.4250 manhard.com DRAWN BY: DATE: SCALE: CPN: Civil Engineers I Surveyors I Water Resource Engineers I Water&Waste Water Engineers Construction Managers 1 Environmental Scientists I Landscape Architects I Planners SJM 2022-08-30 103718 Texas Board of Professional Engineers Registration No. F-18141 Pond B - Exhibit B 100 yr-Orifice Discharge Calculations-POND"B" Orifice Data Orifice®1 Orifice t2 Orifice R3 Diameter(in): 4.00 6.00 6.00 Area(at 0.09 0.20 0.20 Elevation(ft.): 657.50 662.50 663.50 Coefficient: 0.60 0.60 0.60 Site and and Stormwater Detention Data Developed Time of Concentration: 10 minutes Stow Duration at Peak Volume: 180.0 minutes Rainfall Intensity at Peak Volume: 1.81 inchealhr I nflow Rate at Pe ak Volume: 7.58 cfs Inflow Volume at Peak Volume: 81,882 cf Allowable Release Rate: 3.13 cfs Required Minimum Storage 64,036 cf Orifice equation used for calculation:0=(Orifice coefflcient)•(Area of Orifice)*(2•g"Elev:Orifice Elev.)1R Orifice 1 Orifice 2 Outflow Elevation Orifice Outflow Rate Required Storage ContourArea Discharge Discharge Volume Difference (feet) (qs) (cfs) Discharge(cfs) (cfs) (�) Storage Storage 00 (cf) A (cf) 657.90 30 0.20 0.00 0.00 0.20 1,157 80,725 30 (80,695) 658.00 310 0.24 0.00 0.00 0.24 1,383 80,499 47 (80,452) 659.00 3,122 0.49 000 0.00 0.49 2,766 79,116 1,763 (77,353) 6fi0.00 7,987 1714 100 0.01 0.64 3,659 78,223 7,318 (70,906) 681.a0 9,9a3 0.7 a 0a. a 0a. 0.77 4,373 77,509 16,263 (61,246) 662.00 11,722 1.17 0.00 0.00 1.11 4,111 71,111 27,171 (49,821) 663.00 13,676 0.97 0.47 0.00 1.44 8,226 73,656 39,774 (33,882) 663.11 14,722 i 01 0.82 0.40 2.23 12,713 69,169 46,674 (22,296) 664.00 15,763 1.06 1.06 0.47 2.59 14,747 67,135 54,494 (12,641) 6fi4.7550 16,822 . . 0.82 3..17 9,,305 3825 , (1,180) 4 1403 2 34 9 340 6,4 31 4,433 =100 yr Volm 7 11 1 66 665.00 17,984 114 142 106 361 20,594 61,296 71,367 10,079 -Max WSEL 665.60 20,61 1.18 1.61 1.29 4.07 23,173 58,709 82,963 24,254 6fi6.00 27,499 1.21 170 1.42 4.34 24,712 57,169 92,596 353427 r-Freeboard • ♦ • MODIFIED S'xS'DROP INLET WITH 4'x4'GRATE OVERFLOW • ► TOP-66S.80' ♦ • • ♦ ♦ THROAT-664.90' �I • ♦ • • ♦ 4'FT WIDE X.S'TALL I ♦ 6"-1I1 ORIFICE-663.50' ♦ • ♦ 6"-DIA ORIFICE=662.50' • ► ♦ ♦ ♦ ♦ • MIN'1'CLEARANCE TO j • ♦ • • ♦ ♦ ♦ ♦ BOTTOM OF ORIFICE SOLII I ♦ ♦ • ♦• • ♦•♦ • ♦ ♦ • • ► ♦ • ♦ WITH FACE CONCRETE ALL ORIFICE CAST INTO It ♦ ♦ ♦ • • • ♦ ♦ ♦ • • • HEADWALL.EXTEND SAME SIZE ♦ • • • • • • ♦ ♦ ♦ PIPE TO MODIFIED Y-INLET STRUCTURE ♦ ► ♦ ► ♦ ♦ ♦ ♦ • ♦ ♦ ♦ INSTALL RUSTPROOF RIGID TRASH ♦ ♦ ♦ • ♦ • • • • • SCREEN OVER ORIFICE TO PREVENT • • • ♦ ♦ ► • ♦ CLOGGING • BOX ELEVATION-6S7.20' I ♦ ♦ • • ♦ • ♦ ♦ ♦ • ♦ • • ♦ • O r I= • 4"-DIA ORIFICE FL-6S7.90' I� DETENTION POND OUTFALL & EMERGENCY SPILLWAY DETAIL ©2019 MANHARD CONSULTING, LTD. ALL RIGHTS RESERVED _ EXHIBIT B (8 OF 9) t4anhard LANDMARK AT RENDON (SWM-2021-0068) CONSULTING OUTFALL DETAILS FOR DETENTION POND B 12225 Greenville Avenue,Suite 1000,Dallas,TX 75243 ph:972.972.4250 manhard.com DRAWN BY: DATE: SCALE: CPN: Civil Engineers I Surveyors I Water Resource Engineers I Water&Waste Water Engineers Construction Managers I Environmental Scientists I Landscape Architects I Planners SJM 2022-08-30 103718 Texas Board of Professional Engineers Registration No. F-18141 Pond B - Exhibit B Modified Rational Method for Stormwater Detention DETENTION POND"B" Purpose: Use the graphical hydrograph method o detormne the volume ofel-ater sbrage needed to comp ensas for increased runoff due o development Method: Use the Modred RaOonaI MCNod to de@rmne maximum rate of runolf,q=celWPf Mare: o-RunoffCoefident I-Rainfall Inbnsity(inmr) A=Drainage Area(acres) Pf-Peaking Factor(ifrequired) I. Determination of Allowable Release Rate FLOWS TO DETENTION POND Storm Events Notes Area ..C.. T. 1Year 25 Year 100 Year Dev Onshe Area Draining To Pond. Pr 83 4.70 0 65 10 12 40 1754 3529 Dev Cffsie Areas Draining to Pond Pr D1 0.37 0.80 10 1.20 1.70 3.42 Total Flows to pond 5.07 13.61 19.23 38.70 Peaking Factors: 1.00 1.00 1.25 MAXI MUM ALLOWABLE RELEASE RATE FROM POND Storm Events Notes Area 1Year 25 Year 100 Year Ex DAM Nlowable Release at Z01'B'(+) Ex(61+g2) 17.69 20.98 31.47 65.56 Areas Bypassing Pond toZ01'Ell(-) Pr R1+321N) 1593 20.05 30.01 62.43 Maximum Allowable Release Rate from pond 1.76 0.93 1.46 3.13 II. Required Storage Calculations,Return Period=100 years Rainfall Allowable Inflow Duration Intensity Inflow Inflow Release Outflow Outflow Required (100-Year) R.I. Volume Rate Volume Volume Storage (hours) (min) (infh0 (ofs) (of) WS) (cf) (cf) (ad-t) 0.08 5 11.09 46.45 13,936 3.13 1,409 12,527 0,288 0.17 10 9.24 38.70 23,222 3.13 1,878 21,344 0.490 0.25 15 7.90 33.43 30,084 3.13 2,348 27,736 0.637 033 20 7.05 2963 35437 313 2,818 32,619 0749 050 30 6.76 24.13 43429 313 3,757 39,672 0911 067 40 4.91 2067 49360 313 4,696 44,664 1025 0.83 50 4.30 1801 54,035 3.13 5,635 48,399 1 1.00. 60 3.84 1608 57,905 3.13 6,575 51,331 2.00 120 2.42 10.14 12,965 3.13 12,210 60,775 ]1d.470 3.00 180 1.01 7.58 81,882 3.13 17,845 64,036360 1.09 4.57 98,620 3.13 34,752 63868 Capacity Required: 64,036 cubicfeet 1.470 acre-feet III. Required Storage Calculations,Return Period=5 years Rainfall Allowable Inflow Duration Intensity Inflow Inflow Release Outflow Outflow Required (100-Year) Rate Volume Rate Volume Volume Storage (hours) (min) (knfhr) (cfs) (Cf) (cfs) (co (cn (tl 0.08 5 7.08 29.66 1,409 146 658 750 0.017 0.17 10 5.74 24.04 14,426 1.46 878 13,548 0.311 0.25 15 4.86 2036. 18,322 1.46 1,097 17,224 0.395 0.33 20 4.23 17.72 21,262 1.46 1,317 19,945 0.458 0.50 30 3.39 14.20 25.560 1.46 1.756 23,804 0.546 0.67 40 2.85 11.94 28,651 1.46 2,195 26,456 0.607 0.83 50 2.47 1 1 1,039 1.46 2,634 28,405 0.652 10 60 2.19 9.17 33,024 1 46 3,073 29,951 0 688 200 120 1.34 561 40413 146 5,707 34,706 0797 3.00 180 0.98 4.10 44,334 1.46 8.341 35,993 0.826 6.00 360 0.57 2.39 51,572 1.46 16,242 35,329 0.511 Capacity Req uired: 35,993 cubic feat 0.826 acre-feet V. Required Storage Calculations,Return Period=1 years Rainfall Allowable Inflow- Duration Intensity Inflow Inflow Release Outflow Outflow Required (100-Yea0 Rate Volume Rate Volume Volume Storage (hours) (min) (inim) ON) (cf) (Cf.) (cq (cf) (ao-f) 0.08 5 5.31 22.24 6,673 0.93 418 6,255 0.144 0.17 10 4.06 17.01 10,204 0.93 557 9,647 0.221 0.25 15 3.32 13.91 12,516 0.93 696 11,820 0.271 033 20 2.82 1181 14,175 093 836 13,339 0306 050 30 2.20 922 16,587 093 1,114 15,473 0355 0.67 40 1.81 7.58 18,196 0.93 1,393 16,803 0.386 0.83 50 1.55 6.49 1 19,478 0.93 1,671 17,806 0.409 100 60 1.36 5.70 20,508 0.93 1,950 18,558 0.426 2.00 120 0.81 3.39 24,429 0.93 3,621 20,808 0.478 3.00 180 0.59 2.47 26,691 0.93 5,292 21,398 0.491 6.00 360 0.34 1.42 3Q762 0.93 10,W6 20,456 0,170 Capacity Required: 20,608 cubicfeet 0.478 acre-feet VI. Summary So` Event 1 Year 25 Year 100 Year Total Flows to pond(cfs) 13.61 1923. 38,70 Maximum Allowable Release Rate from pond(cfs) 0.93 1.46 3.13 ©2919 MANHAR D CONSULTING, Required Detention Volume(ef) 20,80E 35,993 64,036 _ EXHIBIT B (9 OF 9) t4anhard LANDMARK AT RENDON (SWM-2021-0068) C O N S U LT I N G DETENTION POND B 1, 5, & 100-YEAR EVENT 12225 Greenville Avenue,Suite 1000,Dallas,TX 75243 ph:972.972.4250 manhard.com DRAWN EtV: DATE: ..Al CPW Civil Engineers i Surveyors i Water Resource Engineers I Water&Waste Water Engineers Construction Managers i Environmental Scientists i Landscape Architects i Planners SJM 2022-08-30 103718 Texas Board of Professional Engineers Registration No. F-18141 Pond D - Exhibit B / -654 655— pvv�acG 2 -sss_ — 36" PRIVATE pROP' �ESM� STORM —---- 6` pRAAN Np XXXXX� _ / `000. �sn�H 0 b �� 30 -60 ---65 . . 66/— — — 1657.81 FG 656.80 662 ———— e63— 30" PRIVATE >:•4:1 MqP'O STORM N --664-- -144 e R CE ACC SMERGEN� k uuc N�ASEMt� XXXXX)1 -- ---666----- — 5• DETENTION POND CT'ON OUTFALL 667--- B REFER TO DETAIL ' (SHEET 8 OF 9) ___-668 — — 4:7 SEC�lON _ 669 _—— 1 I / 30" PRIVATE s / STORM I I Cl) TZ /: 4:1 / MAINTENANCE PROPOSED PRIVATE _ j� RAMP (15% MAX / RUNNING SLOPE & DRAINAGE EASEMENT / 2% CROSS SECTION / (DOC. NO. XXXXX) i 36" PRIVATE STORM FG 664.10 SANPARy E. (DO (PUBLIC XMT ��: ��a O• NO x �' X X) .................... ©2019 MANHARD CONSULTING, LTD. ALL RIGHTS RESERVED _ EXHIBIT B (1 OF 9) t4anhard LANDMARK AT RENDON (SWM-2021-0068) CONSULTING DETENTION POND D PLAN 12225 Greenville Avenue,Suite 1000,Dallas,TX 75243 ph:972.972.4250 manhard.com DRAWN BY: DATE: SCALE: CPN: Civil Engineers I Surveyors I Water Resource Engineers I Water&Waste Water Engineers Construction Managers 1 Environmental Scientists I Landscape Architects I Planners SJM 2022-08-30 1"=60' 103718 Texas Board of Professional Engineers Registration No. F-18141 Pond D - Exhibit B 675 00 1+00 2+00 3+00 4+00 5+0 675 670 E=111 GRAN 670 665 665 o 100—YR WSO-seamy 660 2 660 PRWOM GRAM 655 655 650 650 0+00 1+00 2+00 3+00 4+00 5+00 LINE " A- A" H : 1 " = 60' V: 1 " = 6 ' ©2019 MANHARD CONSULTING, LTD. ALL RIGHTS RESERVED _ EXHIBIT B (2 OF 9) hjHanhard LANDMARK AT RENDON (SWM-2021-0068) CONSULTING OUTFALL FOR POND D AND SECTION A 12225 Greenville Avenue,Suite 1000,Dallas.TX 75243 ph:972.972.4250 manhard.com DRAWN BY: DATE: SCALE: CPN: Civil Engineers I Surveyors I Water Resource Engineers I Water&Waste Water Engineers Construction Managers I Environmental Scientists I Landscape Architects I Planners SJM 2022-08-30 1"=60' 103718 Texas Board of Professional Engineers Registration No. F-18141 Pond D - Exhibit B -1+00 0+00 1+00 2+00 675 675 670 EXISTING 0 1ADE 670 665 665 100—YR WSEL 63. 0 5—YR WSE 662,00 660 660 PROPOSED GRADE 655 655 650 650 -1+00 0+00 1+00 2+00 LINE "B - B " H : 1 " = 60' V: 1 " = 6 ' ©2019 MANHARD CONSULTING, LTD. ALL RIGHTS RESERVED _ EXHIBIT B (3 OF 9) t4anhard LANDMARK AT RENDON (SWM-2021-0068) CONSULTING DETENTION POND D PROFILE B 12225 Greenville Avenue,Suite 1000,Dallas,TX 75243 ph:972.972.4250 manhard.com DRAWN BY: DATE: SCALE: CPN: Civil Engineers I Surveyors I Water Resource Engineers I Water&Waste Water Engineers Construction Managers 1 Environmental Scientists I Landscape Architects I Planners SJM 2022-08-30 1"=60' 103718 Texas Board of Professional Engineers Registration No. F-18141 Pond D - Exhibit B -0+50 0+00 1+00 1+50 660 660 EXISTING GRADE 655 100 rR WEL 4t1 655 19.91 CFS 527.30 CFS Vwo-1.75 F/S PROPO ED GRADE S'a�o'X U .30FT n-0.04(rlp—rap) 650 650 -0+50 0+00 1+00 1+50 OVERFLOW ROUTE 2 H: 1" = 60' V: 1" = 6' —0+50 0+00 1+00 670 670 PROPOSED DONOMONS Qtaa:57.58 CFS Dfaa 0.50 FT W 53.00 FT C-&0 665 GRADE 665 0 4:1 (TYP) 660 660 -0+50 0+00 1+00 POND D E.S. H: 1" = 6 0' V: 1" = 6' ©2019 MANHARD CONSULTING, LTD. ALL RIGHTS RESERVED _ EXHIBIT B (4 OF 9) t4anhard LANDMARK AT RENDON (SWM-2021-0068) CONSULTING DETENTION POND D CROSS SECTION 12225 Greenville Avenue,Suite 1000,Dallas,TX 75243 ph:972.972.4250 manhard.com DRAWN 6V: DATE: SCALE: CPN: Civil Engineers I Surveyors I Water Resource Engineers I Water&Waste Water Engineers Construction Managers 1 Environmental Scientists I Landscape Architects I Planners SJM 2022-08-30 1"=60' 103718 Texas Board of Professional Engineers Registration No. F-18141 Pond D - Exhibit B I I � I i STA 0+96.18 LINE OUTFACE-2' INSTALL: d 1 — STD. 5'x5' Y—INLET P = 660.55 FL 36"=653.41 (N) \ FL 12"=656.96 (SE) :::i:::<.5:1•:•.,.. F:•.'•:;., PROP. 36" STORM ��--- `;:i:•:•.... :;.':j:;:<`' �'..• AT 0.50% (PRIVATE) � STA 1+03.38 LINE "OUTFACE-2" INSTALL: :::y:::...... 1 — TxDOT 12" PSET—SC P = 658.75 FL 12"=657.00 (NW) PROP. 12" STORM AT 0.50% (PRIVATE) STA 0+14.34 LINE "OUTFALL-2" ss� INSTALL: 66-q TxDOT 36" CH—FW—O <5:::<•:•.•.. P = 656.57 S� :::::�• %::�"•'• �FL 36"=653.00 (S) N I Ld 3 670 • O_ U 670 N r[I t[1 M X J X F Q Q I— I NI yl 665 " Z " Z 665 660 660 Z�- PROFOSED GRADE EXISTING ADE 655 7' — 12' STORM AT STORM655 0 30 60 120 AT 0.50% (PRIVATE) 0.50% SCALE: 1"=60' Z �^ 650 650 in n IIyI n II rn N �N rn 646 646 ©2019 MANHARD CONSULTING, LTD. ALL RIGHTS 2+GO0 1+00 0+00 —0+50 _ EXHIBIT B (5 OF 9) Manhard LANDMARK AT RENDON (SWM-2021-0068) CONSULTING OUTFALL FOR POND D 12225 Greenville Avenue,Suite 1000,Dallas.TX 75243 ph:972.972.4250 manhard.com DRAWN BY: DATE: SCALE: CPN: Civil Engineers I Surveyors I Water Resource Engineers I Water&Waste Water Engineers Construction Managers I Environmental Scientists I Landscape Architects I Planners SJM 2022-08-30 1"=60' 103718 Texas Board of Professional Engineers Registration No. F-18141 Pond D - Exhibit B LEGEND - — � INLET PROTECTION PROP — �❑ oona ETE WASHOUT SILT FENCE / X SILT FENCE CONSENTRANCEnDN / PROP 660 MAJOR / CHECK DAM 682 PROPOSED MINOR CONTOURS i i -657 1. THE CO NI ONTF9 i 1. THE EROSION CONTROL PLAN HAS BEEN PREPARED TO PROVIDE MEANS TO - PREVENT OR MINIMIZE POLLUTION OF STORM WATER. - / 2 THE CONSTRUCTION ACTIVITY INCLUDED IN THIS PLAN WILL INCLUDE: 2.1.1. CLEARING AND GRUBBING 5� 21.2. ROUGH GRADING 2.1.3, FINAL GRADING -659- f 2.1.4. UTILITY INSTALLATION 21.5. PAVEMENT INSTALLATION 2.1.6. BUILDING CONSTRUCTION Cl) 3, THE TOTAL ESTIMATED LAND AREA TO BE DISTURBED IS 20.96 ACRES. PROP INLET 61 - - x 4. THE SESTIMATED RUNOFF COEFFICIENT UPON COMPLETION OF THE PROJECT IS PROTECTION & THE STORM WATER EXITING THE SITE DRAINS TO AN EXISTING DRAINAGE SYSTEM PROP / MAINTAINED BY THE CTY OF GRAND PRAIRIE. CHECK DAM 6. THE SOILS ON THE SITE ARE GENERALLY. 7. THE CONTRACTOR SHALL PROVIDE AND MAINTAIN EROSION PROTECTION AROUND 4:1 ` THE WORK AREA PERIMETER AND AT ALL INLET MOUTHS PRIOR TO COMMENCING P PROP WORK AND UNTIL THE WORK AREA HAS BEEN STABILIZED. -- -664 ` CHECK DAM/ B. THE CONTRACTOR WILL REMOVE ALL EXCESS SOIL FROM CONSTRUCTION VEHICLES PRIOR TO EXITING THE SITE 9. ALL DISTURBED AREAS WHICH WILL NOT BE RE-DISTURBED FOR A MINIMUM OF 665 \ 21 DAYS MUST BE STABILIZED BY THE CONTRACTOR TO CONTROL EROSION. _ \ 10 THE CONTRACTOR SHALL UNDERTAKE PROPER METHODS TO REDUCE DUST -666 --- A GENERATION FROM THE SITE \ 11.THE CONTRACTOR MUST COMPLY WITH FEDERAL STATE AND LOCAL REGULATIONS \ I REGARDING SEDIMENT AND EROSION CONTROL 667-- C/) 12 A COPY OF THIS PLAN MUST BE KEPT AT THE CONSTRUCTION FACILITY DURING THE ENTIRE CONSTRUCTION PERIOD. AN 668 1&ON-SITEDCTION BASIN A4 SEQUENCING EDIMENT MUST COLLECTION FOR BAS N PRIOR TO THE DI TURBANCE 4:J GL/ OF GREATER THAN 10 ACRES OF LAND. 669 -__ _- I / 14.ALL FINISHED GRADES ARE TO BE HYDROMULCHED,SPOT SODED OR SEEDED i' AND WATERED UNTIL GROWTH IS ESTABLISHED ON AND OFF-SITE. / - 15,A PIT OR WASH OUT BASIN SHALL BE CONSTRUCTED ON-SITE BY THE CONTRACTOR FOR THE"WASH OUT"OF CONCRETE TRUCKS. PROP i 16.A BERM OR OTHER SPILL PROTECTION MEASURE SHALL BE USED FOR ANY TEMPORARY FUEL STORAGE TANK ON SITE CHECK DAM PROP INLET / 17.IF'SUMP"PUMPS ARE USED TO REMOVE WATER FROM EXCAVATED AREAS, PROTECTION TFILTER THE HE WATER DLISCHAREAVES 7HE 9REQAOVE SEDIMENT AND OTHER POLLUTANTS BEFORE / 1&TO PREVENT DAMAGE TO VEGETATION IN DOWNSTREAM WATER COURSES,LIMIT / ANY PROPOSED LIME STABILIZATION OPERATIONS TO THAT WHICH CAN BE MIXED AND COMPACTED BY THE END OF EACH WORK DAY.GEOTEXTILE FABRIC 4: IS NOT EFFECTIVE IN FILTERING UME SINCE THE GRAIN SIZE IS SMALLER THAN THE OPENING IN THE FABRIC. 19.VEHICLE PARKING AREAS STAGING AREAS,STOCKPILES,SPOILS,ETC.SHALL BE / LOCATED SUCH THAT THEY WILL NOT ADVERSELY AFFECT STORM WATER QUALITY.OTHERWISE,COVERING OR ENCIRCLING THE AREAS WITH PROTECTIVE / MEASURES WILL BE NECESSARY. l / PROP 20.STORE ALL TRASH AND BUILDING MATERIALS WASTE IN AN ENCLOSURE UNTIL \ ^ ` CHECK DAM PROPER DISPOSAL AT THE APPROPRIATE OFF-SITE FACILITIES. 21.TRACKING OF SEDIMENT OFF SITE BY TRUCK TRAFFIC SHALL BE HANDLED / THROUGH REGULAR CLEANING. 22.INSPECTION SHALL BE CONDUCTED BY THE PERMITEE ONCE EVERY 2 WEEKS / AND WITHIN 24 HOURS AFTER A STORM EVENT 22.1.1. DISTURBED AREAS OF THE SITE THAT HAVE NOT BEEN STABILIZED, rib __ 22.1.2 AREAS USED FOR STORAGE OF MATERIALS THAT ARE EXPOSED TO i PRECIPITATION, _ 22.1.3. STRUCTURAL CONTROL MEASURES, 22.1.4, LOCATIONS WHERE VEHICLES ENTER OR EXIT THE SITE,AND 22.1.5. IDENTIFICATION OF MEASURES THAT NEED TO BE MAINTAINED,MODIFIED, PROP OR ADDED TO CORRECT PROBLEMS. SILT FENCE -23.CONTRACTOR SHALL PREVENT THE DISCHARGE OF BUILDING MATERIALS,UME, _ CEMENT,CONCRETE,ASPHALT,AND MORTAR TO THE MS 4 OR TO THE WATERS Cn OF THE UNITED STATES 24.PERMANENTLY STABILIZE EXPOSED SOIL WITHIN AND ADJACENT TO THE SITE, �o / THAT IS DISTURBED BY VEHICLES,GRADING,AND OTHER CONSTRUCTION PROP INLET - ACTIVITIES / 25.CONTAIN ALL RUNOFF FROM MATERIAL USED IN SUBGRADE STABILIZATION. PROTECTION 26.MATERIAL STOCKPILES SHALL BE COVERED BY PLASTIC OR SURROUNDED BY EROSION CONTROL STRUCTURES TO CONTROL SEDIMENT RELEASES. ............ .. 27.A CERTIFICATE OF OCCUPANCY WILL NOT BE GRANTED UNTIL THE AREA IS RESTORED WITH 90X VEGETATIVE COVERAGE. 28.WHERE CURB INLETS ARE ADJACENT TO DRIVES AND STREETS ACTIVE TO I / VEHICULAR TRAFFIC,THE CITY OF ALLEN P2 INLET PROTECTION IS TO BE ! C 2019 A HARD S -: I L D. ALL �� S RVED / / / PROVIDED INSTEAD OF THE STANDARD CONCRETE BLOCK INLET PROTECTION. _ EXHIBIT B (6 OF 9) t4anhard LANDMARK AT RENDON (SWM-2021-0068) CONSULTING DETENTION POND D EROSION CONTROL PLAN 12225 Greenville Avenue,Suite 1000,Dallas,TX 75243 ph:972.972.4250 manhard.com DRAWN BY: DATE: SCALE: CPN: Civil Engineers I Surveyors I Water Resource Engineers I Water&Waste Water Engineers Construction Managers I Environmental Scientists I Landscape Architects I Planners SJM 2022-08-30 1"=80' 103718 Texas Board of Professional Engineers Registration No. F-18141 Pond D - Exhibit B R.O.W. W MIN. 16' r 1; STEEL OR MOOD PORT AT f QQ(MAC 0000 0 0 0 0 0 0 0 0 0o o o 0 0 o c � POST OPMONS: °o°oo°o°o°o°o°o°o°o°o° ° ° ° °o°o°o°o°o°o°oo°o° ° ' MOOD-4*W OR S'MN.DU. Comm STEEL- Im m/FT.MN. 0 0 0 o 0 0 0 0 0 0 0 0 0 0 0 o PAVEMENT o 0 0 0 0 0 0 0 0 0 0 0 0 0 000, 0000000000000000000000 � WINE FABRIC(10 GA.LNE MRES MN. NO1 ROCK IIEY 803.3 12 1/2 GA.NTERYEDIATE MINES MIN.) 010G � 'TYPE A PoPRAP' PLAN VIEW 7RANS17M 70 YRAFI 1°°°E Oft APPROVED EQUAL PAVED SURFACE ANCHOR FABRIC N 8W 5W MIN. TRENCH.BAC FLL&COMPACT GRADE 70 PREVENT RUNOFF FROM LEAVNG SITE DOSING FLOW oa°o oa Ooo c.Q 0o00 0o0op000000Q 0op 0o 0oo 0o PAVDEIIT 0° °° Tr r� IL NDD ERLj� S*MN. _!EgS1BIG GROUND APPRO IED EGUAW GRADE TO ORAN AWAY FROM PROFILE STABALRA710N AM WREET PAVED SILT FENCE SURFACE DRAINAGE MUST FLOW AWAY FROM ENTRANCE. NOT 70 SCALE STABALIZED CONSTRUCTION ENTRANCE 1 NDT 70 SCALE wRE GSNiEp1 CONCRETE 111.01010111 0 1-1___/•t FLIER o° °o SIOFE FLOW _oo � o0000000 LESS'MAN Iles BE SLOPE DROP INLET '' ne°imi� M�ea° aol au a Ilooc it MN. L u°O�C°1:� �OYBI R MAIN YOi�M_NMLML Mrt W I M A w171 L=GF M A M L RI�I IIM� S N�17t�1A1R Isalx W s9U w"ia-K eu mm wiv Tiw�e SECTION SECTION A—A � O 0"0°O°O° FIID CIIIIFO �.�) lLtOt►Aw IEr r �uS�ofeio All 0e Kx DROP INLET �= amnkip LN Ow` �ms Owa n O O O O O O O tb L■ICI LIa�C S 11�M OOI OII�ICI O R71►Aw0 �Ottl eI�Y1O�AAO AW W�M=M U 00 00 17LI ff FL7�R STONE O 00 °O A °0 °0 A AN sm-!IAlI O° O 0 C AOF R FAAD�M[IC 0 00 o0C QM IIM o° o c CONOREFE 00 0 0` BLOQCS 00 0 00 0 0 1/2'X1/7 O°o°o°o°o°o°o°o°o°O°00° RE 9CIED1 FLM ll w O 000000000000000 O O MgORLL IO�IFwW m PLAN VIEW ISOMETRIC PLAN MEIN (3)DROP INLET PROTECTION 5 ROCK BERM NOT 70 SCAI E ©2019 MANHARD CONSULTING, LTD. ALL RIGHTS RESERVED _ EXHIBIT B (7 OF 9) t4anhard LANDMARK AT RENDON (SWM-2021-0068) CONSULTING DETENTION POND D EROSION CONTROL DETAILS 12225 Greenville Avenue,Suite 1000,Dallas,TX 75243 ph:972.972.4250 manhard.com DRAWN BY: DATE: SCALE: CPN: Civil Engineers I Surveyors I Water Resource Engineers I Water&Waste Water Engineers Construction Managers 1 Environmental Scientists I Landscape Architects I Planners SJM 2022-08-30 103718 Texas Board of Professional Engineers Registration No. F-18141 Pond D - Exhibit B 100 yr-Orifice Discharge Calculations-POND"Y Orifice Data Orifice#1 Orifice#2 Orifice#3 Diameter(in): 8.00 18.00 18.00 Area(sf): 0.35 1.77 1.77 Elevation(ff.): 656.80 661.00 662.00 Coefficient: 0.60 0.60 0.60 Site and and Stormwater Detention Data Developed Time of Concentration: 10 minutes Storm Duration at Peak Volume: 50.0 minutes Rainfall lntensity at Peak Volume: 4.30 incheslhr Inflow Rate at Peak Volume: 26.80 cfs Inflow Volume at Peak Volume: 80,391 cf Allowable Release Rate: 19.91 cfs Required Minimum Storage 44,554 cf Orifice equation used for calculation:Q=(Orifice coefficient)*(Area of Orifice)*(2*g*Elev:Orifice Elev.)` Elevation ContourArea Orifice Orifice Orifice outflow Rate Outflow Required Provided Difference Discharge Discharge Discharge Volume Storage Storage (ft) (so (cfs) (cfs) (cfs) (cfs) (0 (cf) (cf) (co 656.80 228 000 0.00 0.00 0.00 0 80,391 (80,391) <-Tail Water Cond. 657.00 1,253 0.17 0.00 0.00 0.17 301 80,090 (80,090J <_Tail Water Cond. 658.00 1,706 1.56 0.00 0.00 1.56 2,816 77,575 1,480 (76,095) 659.00 3,719 230 0.00 0.00 2.30 4,133 76,258 4,192 (72,066) 660.00 6,545 2.85 0.00 0.00 2.85 5,122 75,269 9,324 (65,946) 661.00 10,319 3.30 0.00 0.00 3.30 5,949 74,442 17,756 (56,686) 662.00 16,388 3.71 5.82 0.00 9.53 17,154 63,237 31,110 (32,127) 662.50 20,098 3.89 7.37 1.78 13.04 23,478 56,914 40,231 (16,683) 662.75 21,436 3.98 8.51 3.71 16.21 29,171 51,221 45,423 (5,798) <=100yr WSEL 663.00 22,773 4.07 9.51 3.71 17.30 31,136 49,255 50,949 1,694 663.50 23,847 4.24 11.26 7.37 22.87 41,158 39,233 62,604 23,371 <-Max WSEL 664.50 37,178 4.56 14.11 11.26 29.93 53,870 26,521 93,116 66,596 <=Freeboard • • • MODIFIED 5'x5'DROP INLET WITH 4'x4'GRATE OVERFLOW • • TOP=664.00' • • • • THROAT=663.00' • • • • • • 4'FT WIDE X.S'TALL WITH • • • 18"-DIA FORMED/CUT _ • • • • INTOY-INLETOPENING • 18"-DIA ORIFICE=662.00' j ' • • ; • 18"-DIA ORIFICE-661.00' • • • MIN'VCLEARANCE TO I • • • • • • • • BOTTOM OF ORIFICE • • • • • • • • • • • • SOLID FACE CONCRETE WALL I I I • • • • • • • • • • • WITH ORIFICE CAST INTO • • • • ♦ • • • • • • • • HEADWALL.EXTEND SAME SIZE • • • • • • • • • • PI PETD MODIFIED Y-INLET STRUCTURE • ► • • • ► • • • • INSTALL RUST PROOF RIGID TRASH -_ • • • • • • • SCREEN OVER ORIFICE TO PREVENT • • • • • • • • • • • • • CLOGGING • • BOX ELEVATION-656.50' I • •: • • • ••• • • •• • O • • O I- O r I� • 8"-DIA ORIFICE FL=656.80' r (- DETENTION POND OUTFALL & EMERGENCY SPILLWAY DETAIL ©2019 MANHARD CONSULTING, LTD. ALL RIGHTS RESERVED _ EXHIBIT B (8 OF 9) t4anhard LANDMARK AT RENDON (SWM-2021-0068) CONSULTING DETENTION POND D OUTFALL DETAILS 12225 Greenville Avenue,Suite 1000,Dallas,TX 75243 ph:972.972.4250 manhard.com DRAWN BY: DATE: SCALE: CPN: Civil Engineers I Surveyors I Water Resource Engineers I Water&Waste Water Engineers Construction Managers 1 Environmental Scientists I Landscape Architects I Planners SJM 2022-08-30 103718 Texas Board of Professional Engineers Registration No. F-18141 Pond D - Exhibit B Modified Rational Method for Stormwater Detention DETENTION POND"U' Purpose: Use the graphical hydrograph method fo det�rmne the volume ofsbrmwaler sbrage needed to ccrrpensat� for increased runoffdue to developirvi Method- Use the Modifed Ratonal Method Is daternme maximum ree ofrunof,q=0-A"Pt Where: c=RundCoeffdent I=Rainfall Intensity(irdhr) A=Drainage Area(acres) Pf-Peaking Factor(rfrequxr d) I. Determination ofAllowable Release Rate FLOWS TO DETENTION POND Storm Events Notes Area ..C.. T. 1 Year 25 Year 100 Year Dev Onsits Area Draining To Pond. Pr D2 7.67 065 10 2024 28 62 5758 Dev Offs to Areas Draining 13 Pond - Total Flows to pond 7.67 20.24 28.62 57.58 Pealing Factors:1 1.00 1.00 1.25 MAXIMUM ALLOWABLE RELEASE RATE FROM POND Storm Events Notes Area 1 Year 25 Year 100 Year Ex DAM Alowable Release at Z01"D"(+) Ex D1+Ex D2 9.69 8.96 13.36 27.42 Areas Bypassing Pond In ZOl'D"(-) Pr D3 1.25 330 373 7.51 Maximum Allowable Release Rate from pond 8.44 6.67 9.63 19.91 It. Required Storage Calculations,Return Period=100 years Rainfall Allowable Inflow- Duration Intensity Inflow Inflow Release Outflow Outflow Required (100-Year) Rate Volume Rate Volume Volume Storage (hours) (min) (inthr) (cfs) (cf) (of-) (of) (cf) (ac-ft) 0.08 5 11.09 69.11 20,733 19,91 8,959 11,774 0.270 0.17 10 9.24 57.58 34,550 19,91 11,946 22,604 0.519 0.25 15 7.98 49.73 44,757 19,91 14,932 29,825 0.685 0.33 20 7.05 43.93 52,722 19.91 17,919 34,803 0.799 0.50 30 5.76 35.90 64,612 19.91 23,892 40,721 0.935 0.67 40 4.91 30.60 73,436 19.91 29,864 43,572 1.000 E200 50 4.30 26.80 80,391 19.91 35,% 44,554 1.023 60 3.84 23.93 86149 19.91 41,810 44,339 1.018 120 2.42 15 08 108584 19 91 77647 30,937 0710 180 1.81 1128 121821 1991 113485 8336 0191 360 1.noI 6.79 146,723 19.91 220,997 -74,273 -1.705 Capacity Required: 44,554 cubic feet 1.023 acre-feet III. Required Storage Calculations,Return Period=5 years Rainfall Allowable Inn ow- Duration Intensily Inflow Inflow Release Outflow Outflow Required (100-Year) Rate Volume Rate Volume Volume Storage (hours) (min) (inthr) (cfs) (oft (cfs) (G) (cf) (ac-ft) 008 5 708 44.12 13,237 963 4,333 8,903 0204 0.17 10 574 3577 21,463 9 63 5,778 15,685 0 360 0.25 15 4.86 30.29 27,258 9.63 7,222 20,036 0.460 0.33 20 4.23 26,36 31,633 9.63 8,667 22,966 0.527 0.50. 30 3.39 21,13 38,027 9.63 11,555 26,472 0.608 0.67 40 2.85 17.76 42,626 9.63 14,444 28,182 0.647 0.83 50 2.47 15.39 46,178 9.63 17,333 28,845 0.662 1.00 60 2.19 13.65 49,132 9.63 20,222 28,910 0.664 2.00 120 1.34 8.35 60,125 9.63 37,555 22,570 0.518 3.00 180 0.98 6.11 65,958 9.63 54,888 11,070 0.254 500 360 057 3.5E 76,727 963 106,887 -30,160 -0692 Capacity Req uired: 28,910 cubic feet 0.664 acre-feet V. Required Storage Calculations,Return Period=1 years Rainfall Allowable Inflow- Duration Intensily Inflow Inflow Release Outflow Outflow Required (100-Year) Rate Volume Rate Volume Volume Storage (hours) (min) (inlh0 (cfs) (c0 (crs) (c0 (ct) (ac-ft) 0.08 5 6.31 33.09 9,927 5.87 2,550 7,378 0.169 0.17 10 4.06 25.30 15,181 5.67 3,399 11,781 0.270 0.25 15 3.32 20.69 18,621 5.07 4,249 14,372 0.330 0.33 20 2.82 17.57 21,089 5.07 5,099 15,989 0.367 0.50 30 2.20 13.71 24,678 5.67 6,799 17,879 0.410 0.67 40 1,81 11.28 27,071 6,67 8,499 18,673 0.426 0.83 50 1.55 9.66 28,978 5,67 10,198 18,780 0.431 10 60 136 8 48 30,511 5 67 11 898 18,613 0427 200 120 081 565 36,344 567 22696 14,248 0327 300 180 059 3 68 39,710 5 67 32 296 7,415 0.170 6.00. 1 360 0.34 2.12 45,767 5.67 62,890 -17,123 -0.393 Capacity Required: 18,780 cubic feet 0.431 acre-feet VI. Summary Stone Event 1Year 5Year 100 Year Total Flows to pond(cfs) 2024 28.62 1751 Maximum Allowable Release Rate from pond(cfs) 567 963 1991 ©2019 MANHARD CONSULTING, Required Detention Volume(GO 1 18,700 28,910 41,554 _ EXHIBIT B (9 OF 9) Hanhard LANDMARK AT RENDON (SWM-2021-0068) CONSULTING DETENTION POND D 1, 5, (Sc 100-YEAR EVENT 12225 Greenville Avenue,Suite 1000,Dallas,TX 75243 ph:972.972.4250 manhard.com DRAWN 6Y: DATE: SCALE: CPN: Civil Engineers I Surveyors I Water Resource Engineers I Water&Waste Water Engineers Construction Managers 1 Environmental Scientists I Landscape Architects I Planners SJM 2022-08-30 103718 Texas Board of Professional Engineers Registration No. F-18141 Pond E - Exhibit B 667 J I 18" PRIVATE 668 STORM 668 2 PRIVATE ` 41 'ss4 : STORM QP/m 26 EM PROPOSED qpC fS fRG fNC _- .-.-`. a: :-:-:::. PRIVATE CDpC. N0 XkMFNI / ss8::: ': DRAINAGE / EASEMENT / kXXJ DETENTION POND ss6 '' - OUTFALL ♦ REFER TO DETAIL (SHEET 10 OF 11) 40 ... / 66 Iv ' 24" PRIVATE / FG 663.00 STORM FG 663.05 ro 36" PRIVATE / 18" PRIVATE m OR / STORM 10'x6' PRIVATE -� PROP. 10' i G.663.0(. STORM MAINTENANCE / BERM J�- 1 x _ mx �° F O C"Z)X 30" PRIVATE r o STORM d z MAINTENANCE RAMP a o (15% MAX RUNNING N w I SLOPE & 2% CROSS Y; SLOPE) _ :Y: PROP. PRIVATE o FG 668.40 ��I DRAINAGE EASEMENT FG 667.9, (DOC. NO. XXXXX) _ P:v� � ( 4(N U�</YL,aF SM p pC 61-2 0 -- k w Ld �— i EX W E W /°— EX SMH 66H TT 0 - 0------ -- --` O- --=� ---- Ln / SC ADO' `. -" i ©2019 MANHARD CONSULTING, LTD. ALL RIGHTS RESERVED _ EXHIBIT B (1 OF 9) t4anhard LANDMARK AT RENDON (SWM-2021-0068) CONSULTING DETENTION POND E PLAN 12225 Greenville Avenue,Suite 1000,Dallas,TX 75243 ph:972.972.4250 manhard.com DRAWN BY: DATE: SCALE: CPN: Civil Engineers I Surveyors I Water Resource Engineers I Water&Waste Water Engineers Construction Managers 1 Environmental Scientists I Landscape Architects I Planners SJM 2022-08-30 1"=60' 103718 Texas Board of Professional Engineers Registration No. F-18141 -0+50 0+00 1+00 2+00 3+00 3+50 675 675 10' 10• MAINTENANCE BERM MAINTENANCE BERM 670 EXISTING GRADE 670 r 7 100-YR WSEI = 5-7 WSEL-666.50 MAX 15X ACR 1- MAINTENANCE (nP) 665 2�pz __7Ad - 665 PROPOSM GRAD 660 AT 0.50X3111(P IVTATE) 660 OP OF PIPE EX. 15" SAN (PUBLI 655 655 -0+50 0+00 1+00 2+00 3+00 3+50 POND SECTION " A- A" H : 1 " = 60' ; V: 1 " = 6 ' ©2019 MANHARD CONSULTING, LTD. ALL RIGHTS RESERVED _ EXHIBIT B (2 OF 9) t4anhard LANDMARK AT RENDON (SWM-2021-0068) CONSULTING DETENTION POND E PROFILE A 12225 Greenville Avenue,Suite 1000,Dallas,TX 75243 ph:972.972.4250 manhard.com DRAWN 6V: DATE: SCALE: CPN: Civil Engineers I Surveyors I Water Resource Engineers I Water&Waste Water Engineers Construction Managers I Environmental Scientists I Landscape Architects I Planners SJM 2022-08-30 1"=60' 103718 Texas Board of Professional Engineers Registration No. F-18141 Pond E - Exhibit B -0+50 0+00 1+00 2+00 3+00 675 675 670 10' 10' 670 MAINTENANCE BERM MAINTENANCE BERM 17 100—YR WSEL=667. 17 5— 50 MAX 15X ACROSS — V 1— as- MAINTENANCE(TYP.) 665 MAINTENANCE EXISTING 33RADE 665 RAMP 2.o$ PROPOSED GRADE 660 660 655 655 -0+50 0+00 1+00 2+00 3+00 POND SECTION "B - B " H : 1 " = 60' ; V: 1 " = 6 ' ©2019 MANHARD CONSULTING, LTD. ALL RIGHTS RESERVED _ EXHIBIT B (3 OF 9) t4anhard LANDMARK AT RENDON (SWM-2021-0068) CONSULTING DETENTION POND E PROFILE B 12225 Greenville Avenue,Suite 1000,Dallas,TX 75243 ph:972.972.4250 manhard.com DRAWN 6V: DATE: SCALE: CPN: Civil Engineers I Surveyors I Water Resource Engineers I Water&Waste Water Engineers Construction Managers I Environmental Scientists I Landscape Architects I Planners SJM 2022-08-30 1"=60' 103718 Texas Board of Professional Engineers Registration No. F-18141 Pond E - Exhibit B —0+50 0+00 1+00 670 670 100 YR WSEL CON I 1--WATER DITION) EXISTING GRADE 100 YR WSEL 665 Q'm.4 COMMONSCFS 665 O,yp A22 CFS �Iao 11 0.32 FT n-0.035(9mn) PROPOSED GRADE 660 660 —0+50 0+00 1+00 OVERFLOW ROUTE 3 H: 1 " = 60' V: 1 " = 6' —0+75 0+00 1+00 675 675 PROPOSED 0014OITIONS O,ao-23.12 CFS 0,ao 0.50 FT W 20.50 FT C 3.0 670 670 ROPOSED GRADE d 4:1 TYP BOTTOM EL: 667. 665 665 660 660 —0+75 0+00 1+00 POND E E.S. H: 1 " = 60' V: 1 " = 6' ©2019 MANHARD CONSULTING, LTD. ALL RIGHTS RESERVED _ EXHIBIT B (4 OF 9) t4anhard LANDMARK AT RENDON (SWM-2021-0068) CONSULTING DETENTION POND E CROSS SECTION 12225 Greenville Avenue,Suite 1000,Dallas,TX 75243 ph:972.972.4250 manhard.com DRAWN BY: DATE: SCALE: CPN: Civil Engineers I Surveyors I Water Resource Engineers I Water&Waste Water Engineers Construction Managers 1 Environmental Scientists I Landscape Architects I Planners SJM 2022-08-30 1"=60, 103718 Texas Board of Professional Engineers Registration No. F-18141 Pond E - Exhibit B i?_ ??. STA 0+53.71 LINE"OUTFALL-1" INSTALL: 1 — Tx00T 12' PSET—SC 0.�� FG - 664.75 6� � 664 _ fL 12"-663.00(SE) ro ro i� ...'.................. / PROP. 12'STORM AT 0.50%(PRIVATE) Tz ..a.................. / i� �� •�, � , ' ;.;._ STA 0+46.89 LINE 'OUTFALL-1" 6� / INSTALL. / 1 — STD• 5'x5' Y—INLET s �� FG = 666.50 ro FL 36'-682.17(SE) / m° FL 12--662.96(NW) m STA 0+12.26 LINE "OUTFAL&I" obo 0 INSTALL* 1° r3?' _ 1 — TxOOT 38" PSET—SC o 0 665.25 FL 36"-661.81 (NW) a o 0 Lo / 1 A J6o \V / PROP. 36" STORM AT 0.5OX(PRIVATE) ObIl V / / 1+50 1+00 0+00 -0+50 'I 675 Z 675 F 670 Z Z Z 670 N PROPOSED GRADE 665 A�o.S (PRIVATE) 665 EXISTING GRADE 72' 3'STOR 660 �, NZ Z 660 0 30 60 120 j NN mm m 1 N �N SCALE: 1"=60' 655 655 1+50 1+00 0+00 —0+50 ©2019 MANHARD CONSULTING, LTD. ALL RIGHTS RESERVED _ EXHIBIT B (5 OF 9) t4anhard LANDMARK AT RENDON (SWM-2021-0068) CONSULTING OUTFALL FOR DETENTION POND E 12225 Greenville Avenue,Suite 1000,Dallas,TX 75243 ph:972.972.4250 manhard.com DRAWN BY: DATE: SCALE: CPN: Civil Engineers I Surveyors I Water Resource Engineers I Water&Waste Water Engineers Construction Managers 1 Environmental Scientists I Landscape Architects I Planners SJM 2022-08-30 1"=60' 103718 Texas Board of Professional Engineers Registration No. F-18141 Pond E - Exhibit B JLEGEND PROP. INLET PROTECTION INLET PROTECTION 6s 6 ss3 s6zAECK DAM ❑❑ CONCRETE WASHOUT k G9 �� X SILT FENCE i -- — ® CONSTRUCTION ENTRANCE PROP. INLET >:::; . PROTECTION PROPOSED MAJOR '.'6Sa ,� 680 CONTOURS 'y... 666:.. / PROPOSED MINOR 66 682 CONTOURS S 66, r.. / PROP. / 3 CHECK DAM ss PROP. TxaeoN CONIM NWM 1. THE EROSION CONTROL PLAN HAS BEEN PREPARED TO PROVIDE MEANS TO CHECK DAM PREVENT OR MINIMIZE POLLUTION OF STORM WATER. / •• 2 THE CONSTRUCTION ACTIVITY INCLUDED IN THIS PLAN WILL INCLUDE I 'A ' 21.1. CLEARING AND GRUBBING 21.2 ROUGH GRADING 21.3, FINAL GRADING / 21.4. UTILITY INSTALLATION — ! 21.5 PAVEMENT INSTALLATION �o M / 21.6. BUILDING CONSTRUCTION THE TOTAL ESTIMATED LAND AREA TO BE DISTURBED IS 20.96 ACRES. 4. THE ESTIMATED RUNOFF COEFFICIENT UPON COMPLETION OF THE PROJECT IS 0.65. l / 9° ..).-• 6. THE STORM WATER EXITINGTHE SITE DRAINS TO AN EXISTING DRAINAGE SYSTEM MAINTAINED BY THE CITY OF GRAND PRAIRIE. 6. THE SOILS ON THE SITE ARE GENERALLY. 7. THE CONTRACTOR SHALL PROVIDE AND MAINTAIN EROSION PROTECTION AROUND THE WORK AREA PERIMETER AND AT ALL INLET MOUTHS PRIOR TO COMMENCING WORK AND UNTIL THE WORK AREA HAS BEEN STABILIZED. ! B, THE CONTRACTOR WILL REMOVE ALL EXCESS SOIL FROM CONSTRUCTION VEHICLES PRIOR TO EXITING THE SITE 9. ALL DISTURBED AREAS WHICH WILL NOT BE RE—DISTURBED FOR A MINIMUM OF 21 DAYS MUST BE STABILIZED BY THE CONTRACTOR TO CONTROL EROSION. �_10.THE CONTRACTOR SHALL UNDERTAKE PROPER METHODS TO REDUCE DUST V A row.;::' CCCf/ GENERATION FROM THE SITE 11.THE CONTRACTOR MUST COMPLY WITH FEDERAL STATE AND LOCAL REGULATIONS ems, ;•,�• I //I/ o REGARDING SEDIMENT AND EROSION CONTROL \ - / 12 A COPY OF THIS PLAN MUST BE KEPT AT THE CONSTRUCTION FACILITY DURING THE ENTIRE CONSTRUCTION PERIOD. \ \ / ! 13.CONON—SITEDCTION BASIN A4 AN SEDIMENT T PROVIDE COLLECTIONFOR THE EXCAVATION BASN PRIOR TO THE DISTURBANCE J 9 OF GREATER THAN 10 ACRES OF LAND. 14.ALL FINISHED GRADES ARE TO BE HYDROMULCHED,SPOT SODED OR SEEDED AND WATERED UNTIL GROWTH IS ESTABLISHED ON AND OFF—SI7�. �4 15,A PIT OR WASH OUT BASIN SHALL BE CONSTRUCTED ON—SITE BY THE / CONTRACTOR FOR THE"WASH OUT"OF CONCRETE TRUCKS 16.A BERM OR OTHER SPILL PROTECTION MEASURE SHALL BE USED FOR ANY �■ PROP. /�!� TEMPORARY FUEL STORAGE TANK ON SITE SILT FENCE ///! 17.IF"SUMP"PUMPS ARE USED TO REMOVE WATER FROM EXCAVATED AREAS, FILTER THE DISCHARGE TO REMOVE SEDIMENT AND OTHER POLLUTANTS BEFORE 6'0 THE WATER LEAVES THE SITE 18.TO PREVENT DAMAGE TO VEGETATION IN DOWNSTREAM WATER COURSES,LIMIT 622 ANY PROPOSED UME STABILIZATION OPERATIONS TO THAT WHICH CAN BE MIXED AND COMPACTED BY THE END OF EACH WORK DAY.GE TILE FABRIC IS NOT EFFECTIVE IN FILTERING UME SINCE THE GRAIN SIZE IS SMALLER THAN THE 01 \ OPENING IN THE FABRIC. 0 19.VEHICLE PARKING AREAS STAGING AREAS,STOCKPILES,SPOILS,ETC.SHALL BE LOCATED SUCH THAT THEY WILL NOT ADVERSELY AFFECT STORM WATER 0 0 0 QUALITY.OTHERWISE,COVERING OR ENCIRCLING THE AREAS WITH PROTECTIVE / MEASURES WILL BE NECESSARY. 20.STORE ALL TRASH AND BUILDING MATERIALS WASTE IN AN ENCLOSURE UNTIL PROPER DISPOSAL AT THE APPROPRIATE OFF—SITE FACILITIES coo 21.TRACKING OF SEDIMENT OFF SITE BY TRUCK TRAFFIC SHALL BE HANDLED THROUGH REGULAR CLEANING. SMH 668 — 22.INSPECTION SHALL BE CONDUCTED BY THE PERMITEE ONCE EVERY 2 WEEKS tf AND WITHIN 24 HOURS AFTER A STORM EVENT 221.1. DISTURBED AREAS OF THE SITE THAT HAVE NOT BEEN STABILIZED, —————__ —— ——— \— 221.2 AREAS USED FOR STORAGE OF MATERIALS THAT ARE EXPOSED TO —— PRECIPITATION, 221.3. STRUCTURAL CONTROL MEASURES, 221.4, LOCATIONS WHERE VEHICLES ENTER OR EXIT THE SITE,AND \ to ' 22.1.5. IDENTIFICATION OF MEASURES THAT NEED TO BE MAINTAINED,MODIFIED, OR ADDED TO CORRECT PROBLEMS \ X I 23.CONTRACTOR SHALL PREVENT THE DISCHARGE OF BUILDING MATERIALS,LIME, CEMENT,CONCRETE,ASPHALT,AND MORTAR TO THE MS 4 OR TO THE WATERS 6\ 30 60 120 E THE UNITED STATES. 24.P PERMANENTLY STAB IUZE EXPOSED SOIL WITHIN AND ADJACENT TO THE SITE, \ I THAT IS DISTURBED BY VEHICLES,GRADING,AND OTHER CONSTRUCTION ACTIVITIES ——-25.CONTAIN ALL RUNOFF FROM MATERIAL USED IN SUBGRADE STABILIZATION. 28.MATERIAL STOCKPILES SHALL COVERED RE PLASTIC SURROUNDED BY S C ALE: 1'�—6 O' EROSION CONTROL STRUCTURESS TO CONTROL SEDIMENT RELEASES. 27.A CERTIFICATE OF OCCUPANCY WILL NOT BE GRANTED UNTIL THE AREA IS RESTORED WITH 90X VEGETATIVE COVERAGE. 28.WHERE CURB INLETS ARE ADJACENT TO DRIVES AND STREETS ACTIVE TO VEHICUTO BE ©2019 MANHARD CONSULTING, LTD. ALL RIGHTS RE ERVED PROVIDED INSTEAD TRAFFIC. HTHEI STANDARRTY OF D�CONCRETE BLLET OCK INLET PROTECTION.PROTECTION. _ EXHIBIT B (6 OF 9) t4anhard LANDMARK AT RENDON (SWM-2021-0068) CONSULTING EROSION CONTROL PLAN 12225 Greenville Avenue,Suite 1000,Dallas,TX 75243 ph:972.972.4250 manhard.com DRAWN BY: DATE: SCALE: CPN: Civil Engineers I Surveyors I Water Resource Engineers I Water&Waste Water Engineers Construction Managers 1 Environmental Scientists I Landscape Architects I Planners SJM 2022-08-30 1"=60' 103718 Texas Board of Professional Engineers Registration No. F-18141 Pond E - Exhibit B R.aML BO'MN. �16' a SUM OR WOOD POST AT S'C.C.(YAIf) 0 0 0 0 0 o o 0 0 0 0 0 0 0 0 0 0 ° •• PT OPTIONS: 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 WODD-4'X4'OR T Lei.DU. 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 7 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 o E10S111i0 S1EEL—1.33 LBS YN. 000000000000000000000000000000000 o PAMEMINT o 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 o , 0 , 0 0 0 0 0 0 0 0 0 0 0 0 0 0 000c o�o�o�o�0�00000000000000000 0 0 o e WIE FABRIC(10 OA.LNE MIMES MN. s'—B'ROCK 12 1/2 OA.N7E IMI IATf Was MN.) NOTOO IM 111 a 10 'TrPE A RPRAP' PLAN VIEW F1 1 YRAaaBi OR APPRDNED EQUAL,TRANSITION TD PANED SURFACEANCHOR IN OW pp_GG 60'MIN. 7RENCH.FPBM BMWIU.!!OO PACT IZZ GRADE TO PREVENT RUNOFF FROM LEIIVNO SIZE 01131 oopOoppOo°°oo°°oOpOo°pOo° o°... PAVFIENT 0 00 0° 0° °O0 pO0 ppOppO 0 FILM FABRIC � DISTINO GROUND INDEAIJ14 APPROVED EWAQ GQgL AWAY MOM PROFILE �aT1�DSSIRFETPAVED SILT FENCE SURFACE. DRAINAGE MUST FLOW AWAY FROM ENTRANCE NOT TO SCALE STABALIZED CONSTRUCTION ENTRANCE 1 NOT TD SCALE 1 �, CONCRETE BLOCKS WINE SCREo1 1-1/R FILTER 1 0 o S10}E 00 0000 00000 FLOW 000000 00000000 o0000000 LESS THAN roe BX SLOPE DROP INLET L w� �M OIBI otllor rtlrt Ir OIL I M enm�t a*O=Mora !NO rnr IL W r[tai0 art A A O WE OR CF WOW or[o 01r tl0M_0WLW0OWWAAWWO�W Os §� m10 A10a JWWNWe'rL IxW1�oMt��W S1le��M�l 7t rr�r[� IBNIN A OI m0 A rO0rr1 N MarO OK l0>v AmMrAlrl AIYD tlt Mora tmr mt=Corr!trttro FAYML SECTION SECTION A-A nrtr rmt a tarty or s O aw oa �oraeat s ts�s DROP INLET s to s rtoo PAD aDanlrslc eu erAL taa-ne/ a Hoax Fla WOOD 11 FLM►OW L U LU to■moue s O m 0 0 0°o°o° o°o 0 o CROSS SEC710N �0°orrA'rrovat. orrae v of iw O O O O O O O O O O O O irD-rM11Cr0 •Irrt mY�OIIIr s YO N mCt Mm e O O RLm►!O1W ��`l10/1t M7�rllru a mt M O O° O° 1 p° 0° F'L 3101E O OO 00 1400 WO1UKA 0O 00 A m WLm 00 Oo ntWE 0 O O 00 WO om OCONCRETE °0 0 BLOCKSOO O 0 1/29K1/2° 0 0 0 0 0 0 0 0 0°o �°p°p°p°p°p°p°p°p°p°p° !Clot FLOW -m 12t 0 0 0 0 0 0 o t�ttF PLAN VIEW ISOMETRIC PLAN VIEW 5 ROCK BERM 3 DROP INLET PROTECTION ©2019 MANHARD CONSULTING, LTD. ALL RIGHTS RESERVED _ EXHIBIT B (7 OF 9) t4anhard LANDMARK AT RENDON (SWM-2021-0068) CONSULTING EROSION CONTROL DETAILS 12225 Greenville Avenue,Suite 1000,Dallas,TX 75243 ph:972.972.4250 manhard.com DRAWN BY: DATE: SCALE: CPN: Civil Engineers I Surveyors I Water Resource Engineers I Water&Waste Water Engineers Construction Managers 1 Environmental Scientists I Landscape Architects I Planners SJM 2022-08-30 103718 Texas Board of Professional Engineers Registration No. F-18141 Pond E - Exhibit B 100 yr-Orifice Discharge Calculations-POND"E" Orifice Data Orifice#1 Orifice 02 Orifice#3 Diameter(in): 3.00 18.00 0.00 Area(sf): 0.05 1.77 0.00 Elevation(ft.): 662.75 666.10 666.10 Coefficient: 0.60 0.60 0.60 Site and and Stormwater Detentlon Data Developed Time of Concentration: 10 minutes Storm Duration at Peak Volume: 60.0 minutes Rain fall Intensity at Peak Volu me: 3.84 incheslhr Inflow Rate at Peak Volu me: 9.61 cfs Inflow Volume at Peak Volume: 34,595 of Allowable Release Rate: 6.94 cfs Required Minimu m Storage 20,022 cf Orifice equation used for calculation:Q=(Orifice coefficient)*(Area of Orifice)*(2*g*Elev:Orifice Elev.)"x Orifice 1 Orifice 2 Orifice Outflow Required Provided Elevation Contour Area Discharge Discharge Discharge Outflow Rate Volume Storage Storage Difference (ft) (so (cfs) (cfs) (cfs) (cfs) (cf) (cf) (cf) (cf) 662.75 66 0.00 0.00 0.00 0.00 0 34,595 0 (34,595) 663.00 1,712 0.08 0.00 000 0.00 0 34,595 0 (34,595) 664.00 3,085 0.25 0.00 0.00 0.00 0 34,595 0 (34,595) <=flack Water Cond 664.50 3,875 0.30 0.00 0.00 0.30 633 33,962 1,740 (32,222) 665.00 4,826 0.34 0.00 000 0.34 724 33,871 3,915 (29,956) 665.50 5,382 0.38 0.00 0.00 0.36 804 33,790 6,467 (27,323) 666.00 7,974 0.42 0.00 0.00 0.42 877 33,717 9,806 (23,911) 666.50 7,800 0.45 1.16 0.00 1.61 3,372 31,222 13,750 (17,473) 667.00 8,979 0.48 4.99 000 5.47 11,488 23,107 17,945 (5,163) 667.13 9,271 0.49 6.02 0.00 6.51 13,671 20,923 19,085 (1,638) 667.25 9,563 0.49 6.02 0.00 6.52 13,686 20,909 20,262 (646) <=100 yr Volume 667.50 10,146 0.51 6.02 000 6.53 13,715 20,879 22,726 1,846 668.50 18,818 0.56 10.93 000 11.49 24,130 10,465 37,208 26,743 <=Freeboard • ♦ • MODIFIED S'xS'DROP INLET WITH 4'x4'GRATE OVERFLOW • • TOP=668.10' • • THROAT=667.10' �I • • • 4'FT WIDE X.S'TALL WITH • • 18"-DIA FORMED/CUT •-I INTO Y-INLET OPENING• • 18"-DIA ORIFICE=666.10' 1 • • • • • MIN'1'CLEARANCE TO • • • ► • ► • BOTTOM OF ORIFICE • • SOLI I I • • • ► • ► •• • • • • • ••• • • WITHD DA FICECE OCAST INTO ALL • • • • • • • • • • • • • HEADWALL.EXTEND SAME SIZE ♦ • • • • • • • ► • PI PE TO MODIFIED Y-INLET STRUCTURE • ► ► • • • • • • • INSTALL RUSTPROOF RIGID TRASH • • • • • • • • • • • • ♦ SCREEN OVER ORIFICE TO PREVENT • • • • • • • • • CLOGGING BOX ELEVATION-7662.S0' • • • • • • ► • • • • • • • O • • O I- • O r I= • 3"-DIA ORIFICE FL-662.7S' I� r I_ DETENTION POND OUTFALL & EMERGENCY SPILLWAY DETAIL ©2019 MANHARD CONSULTING, LTD. ALL RIGHTS RESERVED _ EXHIBIT B (8 OF 9) t4anhard LANDMARK AT RENDON (SWM-2021-0068) CONSULTING OUTFALL DETAILS FOR DETENTION POND E 12225 Greenville Avenue,Suite 1000,Dallas,TX 75243 ph:972.972.4250 manhard.ccm DRAWN BY: DATE: SCALE: CPN: Civil Engineers I Surveyors I Water Resource Engineers I Water&Waste Water Engineers Construction Managers I Environmental Scientists I Landscape Architects I Planners SJM 2022-08-30 103718 Texas Board of Professional Engineers Registration No. F-18141 Pond E - Exhibit B Modred Rational Method for Storfnwater Detention DETENTION POND"E" Purpose: Use he graphical hydrograph rrehod to determine he volume ofstermwater storage needed to conpensate for increased runolFdue to development Method: Use he Modified Rational Mehod te determine maxinum rate of runoff,0-CI'A'Pf Mere: c=Runoff Coeficient I-Rainfall Intensity Ill A=Drainage Area(acres) Pf=Peaking Factor(if required) I. Determination of Allowable Release Rate FLOWS TO DETENTION POND Storm Events Nolen Are. ..C.. To 1 Year 25 Year 100 Year Dev Onsia Area Draining To Pond Pr E3 3.08 0.65 10,00 5.65 11.49 23,12 Dev Craite Areas Draining to Pond - Total Flows to pond 3.08 6.66 11.49 23.12 Pealung Factors: 1.00 1.00 1.25 MAXIMUM ALLOWABLE RELEASE RATE FROM POND Storm Events Notes Area 1 Year 25 Year 100 Year Ex DAM Allowable Release at Z01"E'(+) Ex(El+E2) 206.03 140.55 219.38 471.32 Areas Bypassing Pond to Z01"E"I-) Pr(E1+E2+E41E5) 200.99 140.08 216.10 464.38 Maximum Allowable Release Rate from pond 5.04 0.47 3.29 6.94 II. Required Storage Calculations,Return Period=100 years Rainfall Allowable Inflow Duration Intensity Inflow Inflow Release Outflow Outflow Required (100-Year) Rate Volume Rate Volume Volume Storage (hours) (rain) (inlhr) (cfs) (cf) (cfs) (of) (cf) aci 0.08 5 11.09 27.75 8,326 6.94 3,123 5,203 0.119 0.17 10 9.24 23.12 13,874 6.94 4,164 9,710 0.223 0.25 15 7.98 19.97 17,973 6.94 5,204 12,768 0.293 0.33 20 7.05 17.64 21,171 6.94 6,245 14,926 0.343 0.50 30 5.76 14.41 25,946 6.94 8,327 17,619 0.404 0.67 40 4.91 12.29 29,489 6.94 10,409 19,080 0.438 rl��83 50 4.30 10.76 32,282 6.94 12,491 19,791 0.454 60 3.84 9.61 34,595 6.94 14,573 20,022 0.460 120 2.42 606 43604 694 27063 16540 0380 180 1.81 453 48,919 694 39554 9365 0215 360 1.09 2.73 58,919 6.94 77,027 -18,108 -0.416 Capacity Required: 20,022 cubic feel 0.660 acre-feet III. Required Storage Calculations,Return Period=5 years Rainfall Allowable I crow- Duration Intensity Inflow Inflow Release Outflow Outflow Required (100-Year) Rate Volume Rate Volume Volume Storage (hours) (min) (inlhr) lots) (cf) lots) (of) (ct) (soft) 008 5 708 17.72 5,315 329 1,478 3,837 0 088 0.17 10 574 14.36 8,619 329 1,971 6,648 0.153 025 15 486 12.16 10,946 329 2,464 8,482 0.195 0.33 20 4.23 10.59 12,703 3.29 2,957 9,746 0.224 0.50. 30 3.39 848 15,270 3.29 3,942 11,328 0.260 0.67 40 2.85 7.13 17,117 3.29 4,928 12,189 0.280 0.83 50 2.47 6.18 18,544 3.29 5,913 12,630 0.290 1.00 60 2.19 5.48 19,730 3.29 6,899 12,831 0.295 2.00 120 1.34 3.35 24,144 3.29 16712 11,332 0.210 3.00 180 0.98 2.45 26,486 3.29 18,725 7,761 0.178 6.00 360 0.57 1.43 30,811 3.29 36,465 -5,654 1 -0.130 Capacity Required: 12,831 cu bic feel 0.295 acre-feet V. Required Storage Calculations,Return Period=1 years Rainfall Allowable Inflow- Duration Intensity Inflow Inflow Release Outflow Outflow Required (100-Year) Rate Volume Rate Volume Volume Storage (hours) (min) (inlhr) (CIS) (of) lots) (of) (of) (soft) 0 08 5 5 31 13.29 3,986 047 213 3,774 0 087 0.17 10 4.06 10.16 6,096 0.47 284 5,812 0.133 0.25 15 3.32 8.31 7,477 0.47 355 7,123 0.164 0.33 20 2.82 7.06 8,468 0.47 426 8,043 0.185 0.50 30 2.20 5.51 91910 0.47 567 9,342 0.214 0.67 40 1.81 4.53 10,871 0.47 709 10,162 0.233 0.83 50 1.55 1 1,637 0.47 851 10,785 0.248 1.00 60 1.36 0 12,252 0.47 993 11,259 0.258 2.00 120 3.4 0.81 2.03 14,595 0.47 1,844 12,750 0.293 3 00 180 069 148 15,946 047 2,696 13,260 0 304 600 360 034 086 18,378 047 5,249 13,129 0301 Capacity Required: 13,250 cu bic feel 0.304 acre-feet VI. Summary Slone Event 1Year 5Year 100 Year Total Flows to pond lots) 5.65 11.49 23.12 �A Maximum Allowable Release Rate from pond lots) 0.47 3.29 6.94 ©2919 MANHARD CONSULTING, Required Detention Volume(cf) 13,250 12,831 20,022 _ EXHIBIT B (9 OF 9) t4anhard LANDMARK AT RENDON (SWM-2021-0068) C O N S U LT I N G DETENTION POND E 1, 5, & 100-YEAR EVENT 12225 Greenville Avenue,Suite 1000,Dallas,TX 75243 ph:972.972.4250 manhard.com DRAWN BY: DATE: SCALE: CPN: Civil Engineers i Surveyors i Water Resource Engineers I Water&Waste Water Engineers Construction Managers i Environmental Scientists i Landscape Architects i Planners Sim 2022-08-30 103718 Texas Board of Professional Engineers Registration No. F-18141 \ . • ® ¥ , \ � § ` , t � . . . � ! . ; °y / \ ` � ■ �® � ! - ° \\/\} \\\\\\§ ) \ \ )} G 0 _; 2 2)»§ 3\\\§ \ - /E=me :o:= ® - >m ®`3@m g2e$m +[omg `�9`g @r:G= ) )\/[ ?`°/- -\yam: § � \\{ \ J - G ¥- 0§m3/ m> ®Q§m) ~� - }§\&\ 0,m0 : - ; \)»)/ )\/k/ e , \J \ ` A\ \\ \ 07:§> \;»G\ \ §R)�7 -7,;:_ ;:= o#=mm :>0 -0 Z=)=z =�o< g o3G \m)) : : \ \}_(:\ }( : :l z>ii 2 m T = : w zm>x j« _ }m m olo j = yLANDMARK COMPANIES Hanhar�, j _meKr�w. CONSULTING - - - - - [ TREEDISPOSITION PLAN ; } ' -. nl�, jJ - - - - _ _ n 3 -77 vy c.� ern �En ym➢ - zoma In 3n z hm10 o m �421 i rx it zi 2o -m cm ° lo _ D z z m x f •,��*% 87 m�'m �7 LANDMARK COMPANIES Manhardu m LANDMARK AT RENDON C O N S U L T I N G N - TREE DISPOSITION SPECIFICATIONS&DETAILS PEND/NG �� '� rnmm� ,��a►��`��.oie�imn,��m�l�a�®®� �= 1�J,_, ,pm��o►min�iranmmi►:�nr�ra�a��, �� '�'— Ms , � Ilion Im In Em. Ron Elm In In In — Iv Il ►�ci► �rt j��► gin 11 l,^ - t h��■\1��m1j wommommom � r - - ' : . ■■■■ 11111 sls llll lolls 811811■1 Il■ I011 LANDMARK COMPANIES Hanhard. FORESTRYLANDMARK AT RENDON CONSULTING URBAN iW ....-- — ._ _ ____— _ _, I I z V Lll i I g ra e, W pp r i q am ryi � : I 1 ki tt I ��P n u x i x e0000 l y y 3 (��{ pp =33 � x�n N �R-D m S o . IN1pi5TAR S9 W MIX , A o .D In m qqie �pp; 4((ai qqie gie 0 C s l2evlslons: DptB: i'6o�a��a � 3 Phase 2 �nw Landmark at Rendon b Urban Forestry .h Ft.Worth Texas Grubbs Design Group, P.L.L.C.-403 South Tennessee Street- McKinney,Texas 75069-Phone(972)548-5020 Exhibit "C" CITY OF FORT WORTH STORMWATER FACILITY OPERATION AND MAINTENANCE PLAN The only responsibility the City of Fort Worth has in the operation and maintenance of this Facility is inspection. General Maintenance Procedures The structural and functional integrity of the Facility shall be maintained at all times by removing and preventing drainage interference, obstructions, blockages, or other adverse effects into, through, or out of the system. Periodic silt removal shall occur when standing water conditions occur or the pond's storage volume is reduced by more than 10%. Silt shall be removed and the pond/basin returned to original lines and grades shown on the approved engineering plans. In addition, corrective measures are required any time a basin does not drain completely within 72 hours of cessation of inflow. NO STANDING WATER IS ALLOWED in basins designed for dry detention purposes. Accumulated litter, sediment, and debris shall be removed every 6 months or as necessary to maintain proper operation of the basin. Disposal shall be in accordance with federal, state and local regulations. Detention facilities shall be mowed monthly between the months of April and October or anytime vegetation exceeds 12-inches in height. To prevent debris from entering and clogging the downstream storm sewer system a wire mesh screen or similar screening device shall be installed over the outlet until final acceptance. 4. PREVENTIVE MAINTENANCE/INSPECTION • Visual inspections of all components will be conducted every 6 months. A log shall be kept of maintenance actions, and inspections. The log should document the condition of the detention system's primary components, mowing, and silt, litter and debris removal dates. Document aeration of the basin bottoms and replanting to prevent the sealing of the basin bottom. Written maintenance and repair records shall be maintained by the party or parties signing the attached Agreement and shall be provided to the City upon request. STORMWATER FACILITY MAINTENANCE AGREEMENT 26 Rev.11/17/2016 Exhibit "D" Stormwater Structural Maintenance CHECKLIST FREQUENT REPAIRS REPAIRS INSPECTION DATE REQUIRED MADE NOTES Mowing Remove Trash and debris Inspect irrigation system operation Remove grass clippings Violations Noted MINOR INSPECTION Condition of Pond Amount of silt in and Amount of silt in flume Amount of ponded water Amount of wetland vegetation Location of Erosion Percent of vegetation Condition of trash guard Location of Erosion MAJOR INSPECTIONS Condition of Stormwater Quality Structure Type of Stormwater Quality Structure Structure type and Condition Condition of Rip- Rap STORMWATER FACILITY MAINTENANCE AGREEMENT 27 Rev.11/17/2016 Condition of filtrations stem Berm or Embankment Settlement Location of erosion Evidence of Animals Evidence of Aquatic life Condition of Aeration Foundation STORMWATER FACILITY MAINTENANCE AGREEMENT 28 Rev.11/17/2016