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HomeMy WebLinkAboutContract 47964 CITY SECRETARY CONTRACT No. DOE # STORM WATER FACILITY MAINTENANCE AGREEMENT THIS AGREEMENT, made and entered into this day of..2 by and between SD, acting by and through hereinafter referred to as "Landowner", and the City of Fort Worth,hereinafter referred to as "City". WITNESSETH WHEREAS, the Landowner is the owner of certain real property described as an approximately 5.0786 ACRE, LOT 16-R, POLLARD ESTATES in the CITY OF FORT WORTH, Tarrant County, Texas according to the deed recorded in CABINET A, SLIDE 7932, 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 WEST 14ANDLEY ELEMENTARY SCHOOL ADDITION AND RENOVATION 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 Storm Water Management Facilities be constructed and maintained on a portion of the Property; and OFFICIAL RECORD CITY SECRETARY FT.WORTH,TX STORM WATER FACILITY MAINTENANCE AGREEMENT Rev.09/10/2012 i WHEREAS, the City requires that on-site Storm Water 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 Storm Water 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 Storm Water Facility includes all pipes, channels or other conveyances built to convey storm water to the facility, as well as all structures, improvements, and vegetation provided to control the quantity and quality of the storm water. Adequate maintenance is herein defined as good working condition so that these facilities are performing their design functions. The Storm Water 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. STORM WATER FACILITY MAINTENANCE AGREEMENT 2 Rev.09/10/2012 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 STORM WATER FACILITY MAINTENANCE AGREEMENT 3 Rev.09/10/2012 r 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 owners association. STORM WATER FACILITY MAINTENANCE AGREEMENT 4 Rev.09/10/2012 4 O [SIGNATURE PAGE FOLLOWS] Executed this 214 day of e6r QWC 2015- Landowner City of Fort Worth 411 L �- Name. F_..._,„a r....� _ D zt: l- Title: p r t5 JJt h t$00.'co ( Assistant City Manager Approved as to Form and Legality ��ti✓ l.-�v c Assistant City Attorney,�R'rNue ATTEST Ma ity Secret r OFFICIAL RECORD CITY SECRETARY FT. WORTH,TX STORM WATER FACILITY MAINTENANCE AGREEMENT 5 Rev.09/10/2012 STATE OF TEXAS § COUNTY OF TARRANT § This instrument was acknowledged before me on )) 2V by 3t�LdC , Assistant City Manager of the City of Fort Worth, dft be aif of the City of Fort Worth. TRIKINYA l JOHNSON -Notary Public,State of Texas Comm. Expires 04-17-2018 Notary Pu ic, S of Texas 1 No ary ID 1238832-0 STATE OF TEXAS § COUNTY OF TARRANT § Before me, the undersigned authority on this 24 day of F--6v A o,cy 20_71 ersonally appeared ev d s / 'T D . C known to me to be the person whose name is subscribed to the foregoing instrument and acknowledged to me that the same is the act of fka jorl'i f"F 1-:36&D i F- ��6N , and that he executed the same as its Ns�j pC-� and as the act of such T16,1 J SD and for the purposes and consideration expressed in the foregoing instrument. N�aFeFw,hw � CMyt,�.Q�Qp,,� LPN pgN�% Notary Pu ' , State of Texas N 191 i 111*A4 1 MMG�,M [OFFICIAL RECORD ITY SECRETARY FT. WORTH, TX STORM WATER FACILITY MAINTENANCE AGREEMENT 6 Rev,09/10/2012 EXHIBIT "A" STORM WATER FACILITY MAINTENANCE AGREEMENT 7 Rev.09/10/2012 EXHIBIT "A-2" STORM WATER FACILITY Detention Pond Maintenance Area BEING a 9,600 square foot tract of land situated in the John Balch Survey, Abstract No. 82 Tarrant County, Texas, and being a part of Lot 16-R of Pollard Estates, an addition to the City of Fort Worth, Texas, as recorded in Cabinet A, Slide 7932, of the Plat Records of Tarrant County, Texas (P.R.T.C.T.), and being more particularly described as follows: COMMENCING at a 1/2-inch found iron rod (controlling monument)for the westerly most northeast corner of said Lot 16-R, and being in the west right-of-way line of Van Natta Lane (60' Right-of-Way), from which point a 5/8-inch found iron rod with cap stamped "Gerry Curtis RPLS #1640° (controlling monument) bears South 25 degrees 18 minutes 49 seconds East, 489.86 feet; THENCE South 00 degrees 11 minutes 21 seconds East, along said west right-of-way line, a distance of 60.00 feet to a point for corner, being the northeast reentrant corner of said Lot 16- R; THENCE North 89 degrees 07 minutes 29 seconds East, along the south right-of-way line of said Van Natta Lane, a distance of 54.00 feet to the POINT OF BEGINNING of the herein described tract of land; THENCE the following courses and distances along the perimeter of a detention pond maintenance area: 1) THENCE North 89 degrees 07 minutes 29 seconds East, continuing along said south right-of-way line, a distance of 120.00 feet to a point for corner; 2) THENCE South 00 degrees 52 minutes 31 seconds East, departing said south right-of- way line, a distance of 90.00 feet to a point for corner; 3) THENCE South 89 degrees 07 minutes 29 seconds West, a distance of 45.00 feet to a point for corner; 4) THENCE North 00 degrees 52 minutes 31 seconds West, a distance of 16.00 feet to a point for corner; 5) THENCE South 89 degrees 07 minutes 29 seconds West, a distance of 75.00 feet to a point for corner; 6) THENCE North 00 degrees 52 minutes 31 seconds West, a distance of 74.00 feet to the POINT OF BEGINNING AND CONTAINING 9,600 square feet or 0.2204 acre of land, more or less. Bearings are based on the Texas Coordinate System, NAD 83 (2011 EPOCH), North Central Zone 4202. DETENTION POND AREA Page 1 EXHIBIT "A-2" STORM WATER FACILITY Detention Pond Maintenance Area I, Colin J. Henry, a Registered Professional Land Surveyor, hereby certify that the legal description hereon and the accompanying plat of even date represent an actual survey made on the ground under my supervision. � � ;Qr�,tsT�rcct 234 , .. Colin J. Henry, R .L.S. bate .Y(j Texas Registration No. 5230 CRIADO & ASSOCIATES, INC. Civil Engineering & Land Surveying Consultants 4141 Blue Lake Circle, Suite 1331 Dallas, TX 75244 PH 972.392.90921 FAX 972.392.9192 TBPLS Firm No. 101633-00 DETENTION POND AREA Page 2 I ` EXHIBIT 'A-1' LOT 15& 24 POINT OF POLLARD ESTATES POLLARD ESTATES COMMENCING CABINET A, SLIDE 7932 l�r F� PR.T.C.T. CABINET A SLIDE 7932 I rC M*, g$r VAN NA17A LANE R (60' RIGHT—OF—WAY) POINT OF BEGINNING N89107219E 120,00 -- N8TO7'29'E 54,00' =; d$� `�� 9bo0 Sq.Ft. $ w 02204 Acres w �i '6'� P ��i 75. 00 O ♦589'07'29tiV �Q LOT 16-A NOD'S2'3rN+ POLLARD ESTATES /sp7 4500 G� CABINET A. SLIDE 7932 P.R.T.C.T. JOHN BALCH SURVEY ABSTRACT NO.82 4�QP� LEGEND EXISTING RIGHT OF WAY LINE PROPOSED TRACT -------- PROPERTY LINE _ -- FOUND PON ROD 0 FIR MESS NOTED OTHERWISE) POINT FOR CORNER • CONTROLLK MONUMENT (C.M.) PLAT RECORDS TARRANT COUNTY TEXAS P.R.T.C.T. •C• , �•:N 0 25 50 _ 100 .,�CAL ...� GRAPHIC SCALE STORM WATER FACILITY OSURVEYOQ DETENTION POND MAINTENANCE AREA (HEREBY CERTIFY THAT THIS PLAT 0.2204 ACRE TRACT OF LAND IN THE IS BASED ON AN ON THE GROUND SURVEY JOHN BALCH SURVEY. ABSTRACT N0. 82. MADE N µ E TO THE BEST OF MY KNOWLEDGE, CITY OF FORT WORTH IS TRUE AND CORRECT. TARRANT COUNTY. TEXAS BEARINGS ARE BASED ON THE TEXAS COORDINATE SYSTEM, NAD 83 (2011)EPOCH 2010.00, NORTH CENTRAL ZONE 4202. COLIN J.HENRY. R.P.L.S. TEXAS No.5230 DATE NAPROJECT\R13058-VRS-FWISD C1PW13058-Ndndley E/amtntery\SurveyWk-%Rt3058-EXHIBIT Wgn Exhibit "B" STORM WATER FACILITY MAINTENANCE AGREEMENT 8 Rev.09/10/2012 OL W W 2 N W W IL ci O O Z r� N M Q LU a H 0 U� x x a ' W 2 3Z O r O (/7 N O O J O W z ZJ �� x 0 O st W O w< �= x LL = Z v W w x --o w O N 0 C7 LLJ �Q OO~ x� o Q W) N fa w� Lu �wX m w m =�j d0w O O W O ``' 3 CO) UW x 1 Z LL w o \ J CL V) o — —\� � Z .. g w a O Cr LLI 3Y W Z a O N Z ��)!� Z ? 0 1 m ¢w g3 0 / oa a 3 -, v� o j W Q o W t~i� W .�j� x (n U Z Z x ) z O �` 3 v of z x o w a w w li Z d, C4: Z a Qf 1 O �"! Z �O Z rn 0 w O I o 1n 3Q- vU c W jL Z H 1f�,� w z rn Q` xb 0 l.� W 001 00 W x Z p � � Z I a w w (A-i U x •y V) a 3 w LL / O x 01 6 a in 00 ap �o � 0 �All x x 1I 1 Z x d ai00 U 00� cr- a=o ofai° a x Z LLJ -J. 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ACRES ACRES C ACRES C COEFFICIENT Al 1.112 0.643 0.90 0.469 0.30 0.647 81 0.164 0.107 0.90 0.057 0.30 0.691 B2 0.160 0.107 0.90 0.053 0.30 0.701 B3 1.342 0.483 0.90 0.859 0.30 0.516 B4 1.239 0.951 0.90 0.288 0.30 0.761 B5 1.059 1 0.387 1 0.90 1 0.672 1 0.30 1 0.519 AREAS-Bl,B2,B3,B4,C1 PROPOSED COMPOSITE RUNOFF COEFFICIENT= 0.608 THE REQUIRED STORAGE IS 9,268 CF THE STORAGE PROVIDED IS 11,808 CF THE ADDITIONAL STORAGE REDUCES THE VALUE OF THE EXISTING COMPOSITE RUNOFF COEFFICIENT FROM 0.586 TO 0.550. THE ALLOWABLE DISCHARGE FROM THE POND OF 18.55 CFS IS REDUCED TO 17.41 CFS FOR THE 100 YEAR STORM. EXISTING CONDITIONS RUNOFF COEFFICIENT CALCULATIONS DRAINAGE TOTAL IMPERVIOUS RUNOFF PERVIOUS RUNOFF EXISTING AREA AREA AREA COEFFICIENT AREA COEFFICIENT RUNOFF NO. ACRES ACRES C ACRES C COEFFICIENT Bl 0.999 0.619 0.90 0.38 0.30 0.672 B2 0.113 0.046 0.90 0.067 0.30 0.544 83 1.220 0.448 0.90 0.772 0.30 0.520 64 0.069 0.0000 0.90 0.069 0.30 0.300 BS 2.676 1.439 0.90 1.237 0.30 0.623 AREAS- B3,B4,AND B5 EXISTING COMPOSITE RUNOFF COEFFICIENT= 0.586 low �PiNOFTF+I41 i DONALD F . �..»�....«...WARNKE, 1R:� cif ;Q 66671..»:�� ; ...STE E 14,K Vis-/)),►S� C1.12.2 WEST HANDLEY ELEMENTARY STORM WATER DETENTION CALCULATIONS 1 YEAR ALLOWABLE DISCHARGE FROM SCHOOL SITE-CFS Qa =Ca*i*A Pre-develop Rainfall Drainage Allowable Runoff Intensity Area Discharge Coefficient in/hr Acres CFS Ca i A Qa 0.55 3.32 1 3.966 1 7.24 (Time of Concentration=15 minutes) CRITICAL STORM DURATION-MIN. Td=((2CAab)/Qa))^0.50-b Allowable Developed Drainage Rainfall Rainfall Critical Storm Discharge Runoff Area Factor Factor Duration CFS Coefficient Acres Tarrant Co. Tarrant Co. Min. Qa C A a b Td 7.24 0.608 3.966 95.835 13.425 16 REQUIRED STORAGE VOLUME-CF Vprelim=60 [(CA*a) - (2CabAQa)^0.5 +(Qa/2)(b-tc)] 1,891 CF Developed time of concentration(min) tc 10 3 hour 1 year storm intensity(in/hr) i 0.59 1 yr Critical duration storm intensity(in/hr) i 3.21 3-hour storm depth 1 year storm P180 1.77 Critical duration storm depth 1 year storm Ptd 1.18 Vmax=Vprelim*(P180/Ptd) 2,844 CF OF i OF* DONALD f. WARNKE:IR:i �...................... or �A 4 �wAV MFG/StEQ.� �2Ar SS�ON Af/1, r C1.12.3 WEST HANDLEY ELEMENTARY STORM WATER DETENTION CALCULATIONS 10 YEAR ALLOWABLE DISCHARGE FROM SCHOOL SITE-CFS Qa = Ca*i*A Pre-develop Rainfall Drainage Allowable Runoff Intensity Area Discharge Coefficient in/hr Acres CFS Ca i A Qa 0.55 1 5.53 1 3.966 1 12.06 (Time of Concentration = 15 minutes) CRITICAL STORM DURATION-MIN. Td= ((2CAab)/Qa))^0.50-b Allowable Developed Drainage Rainfall Rainfall Critical Storm Discharge Runoff Area Factor Factor Duration CFS Coefficient Acres Tarrant Co. Tarrant Co. Min. Qa C A a b Td 12.06 0.608 3.966 203.93 21.09 20 REQUIRED STORAGE VOLUME-CF Vprelim=60 [(CA*a)-(2CabAQa)^0.5 +(Qa/2)(b-tc)] 3,506 CF Developed time of concentration(min) tc 10 3 hour 10 year storm intensity(in/hr) i 1.15 10 yr Critical duration storm intensity(in/hr) i 4.83 3-hour storm depth 10 year storm P180 3.45 Critical duration storm depth 10 year storm Ptd 1.77 Vmax=Vprelim*(P180/Ptd) 6,830 CF t E aF r � 00."­..:.................»t*»e DONALD F. WARNKE,1R ................. i 661 tW E ; rf r' C1.12.4 WEST HANDLEY ELEMENTARY STORM WATER DETENTION CALCULATIONS 100 YEAR ALLOWABLE DISCHARGE FROM SCHOOL SITE-CFS Qa=Ca*i*A Pre-develop Rainfall Drainage Allowable Runoff Intensity Area Discharge Coefficient in/hr Acres CFS Ca i A Qa 0.55 1 7.98 1 3.966 1 17.41 (Time of Concentration= 15 minutes) CRITICAL STORM DURATION-MIN. Td=((2CAab)/Qa))^0.50- b Allowable Developed Drainage Rainfall Rainfall Critical Storm Discharge Runoff Area Factor Factor Duration CFS Coefficient Acres Tarrant Co. Tarrant Co. Min. Qa C A a b Td 17.41 0.608 3.966 322.07 24.388 22 REQUIRED STORAGE VOLUME-CF Vprelim= 60 [(CA*a)-(2CabAQa)^0.5 +(Qa/2)(b-tc)] 5,389 CF Developed time of concentration(min) tc 10 3 hour 100 year storm intensity(in/hr) i 1.81 100 yr Critical duration storm intensity(in/hr) i 6.74 3-hour storm depth 100 year storm P180 5.43 Critical duration storm depth 100 year storm Ptd 2.47 Vmax=Vprelim*(P180/Ptd) 11,842 CF S 1 r �P .........,;C I DONALD ...... 1R 66611 ��i C1.12.5 CALCULATIONS BASED ON REQUIRED POND STORAGE PROPOSED CONDITIONS RUNOFF COEFFICIENT CALCULATIONS DRAINAGE TOTAL IMPERVIOUS RUNOFF PERVIOUS RUNOFF PROPOSED AREA AREA AREA COEFFICIENT AREA COEFFICIENT RUNOFF NO. ACRES ACRES C ACRES C COEFFICIENT Al 1.112 0.643 0.90 0.469 0.30 0.647 B1 0.164 0.107 0.90 0.057 0.30 0.691 B2 0.160 0.107 0.90 0.053 0.30 0.701 B3 1.342 0.483 0.90 0.859 0.30 0.516 B4 1.239 0.951 0.90 0.288 0.30 0.761 B5 1 1.059 1 0.387 0.90 1 0.672 0.30 1 0.519 AREAS-131,132,133,64,C1 PROPOSED COMPOSITE RUNOFF COEFFICIENT= 0.608 EXISTING CONDITIONS RUNOFF COEFFICIENT CALCULATIONS DRAINAGE TOTAL IMPERVIOUS RUNOFF PERVIOUS RUNOFF EXISTING AREA AREA AREA COEFFICIENT AREA COEFFICIENT RUNOFF NO. ACRES ACRES C ACRES C COEFFICIENT BI 0.999 0.619 0.90 0.38 0.30 0.672 B2 0.113 0.046 0.90 0.067 0.30 0.544 B3 1.220 0.448 0.90 0.772 0.30 0.520 B4 0.069 0.0000 0.90 0.069 0.30 0.300 BS 2.676 1.439 0.90 1.237 0.30 0.623 AREAS-B3,B4,AND B5 EXISTING COMPOSITE RUNOFF COEFFICIENT= 0.586 •f OF DONALD y •( �J �N.�NM...N...N.N..� ..*." i DONALD F. WARNKE J . i ................. .. ... ti ?p 0.-o: �or ���FS fc, E��O� a\i�OtV`1. 1 ts C1.12.6 WEST HANDLEY ELEMENTARY STORM WATER DETENTION CALCULATIONS 1 YEAR ALLOWABLE DISCHARGE FROM SCHOOL SITE-CFS Qa = Ca*i*A Pre-develop Rainfall Drainage Allowable Runoff Intensity Area Discharge Coefficient in/hr Acres CFS Ca i A Qa 0.586 3.32 3.966 7.72 (Time of Concentration = 15 minutes) CRITICAL STORM DURATION-MIN. Td = ((2CAab)/Qa))^0.50- b Allowable Developed Drainage Rainfall Rainfall Critical Storm Discharge Runoff Area Factor Factor Duration CFS Coefficient Acres Tarrant Co. Tarrant Co. Min. Qa C A a b Td 7.72 0.608 3.966 95.835 13.425 15 REQUIRED STORAGE VOLUME-CF Vprelim = 60[(CA*a) - (2CabAQa)^0.5 + (Qa/2)(b-tc)] 1,530 CF Developed time of concentration (min) tc 10 3 hour 1 year storm intensity(in/hr) i 0.59 1 yr Critical duration storm intensity(in/hr) i 3.32 3-hour storm depth 100 year storm P180 1.77 Critical duration storm depth 1 year storm Ptd 1.22 Vmax=Vprelim"(P180/Ptd) 2,224 CF /� �fr'� OF• F�9 �+� . � * qty /.*�N.N....N...wN.N•*�� i DONALD F. WARNKE, 1R. i �..........................NN.✓ .�F66671 **�wQ,10 e F �.ISjE.. �,._� C1.12.7 WEST HANDLEY ELEMENTARY STORM WATER DETENTION CALCULATIONS 30 YEAR ALLOWABLE DISCHARGE FROM SCHOOL SITE-CFS Qa=Ca*i*A Pre-develop Rainfall Drainage Allowable Runoff Intensity Area Discharge Coefficient in/hr Acres CFS Ca i A Qa 0.586 5.53 3.966 12.85 (Time of Concentration= 15 minutes) CRITICAL STORM DURATION-MIN. Td =((2CAab)/Qa))^0.50-b Allowable Developed Drainage Rainfall Rainfall Critical Storm Discharge Runoff Area Factor Factor Duration CFS Coefficient Acres Tarrant Co. Tarrant Co. Min, Qa C A a b Td 12.85 0.508 3.966 1 203.93 21.09 19 REQUIRED STORAGE VOLUME-CF Vprelim=60 [(CA*a)-(2CabAQa)^0.5 +(Qa/2)(b-tc)] 2,802 CF Developed time of concentration(min) tc 10 3 hour 10 year storm intensity(in/hr) i 1.15 10 yr Critical duration storm intensity(in/hr) i 4.95 3-hour storm depth 10 year storm P180 3.45 Critical duration storm depth 10 year storm Ptd 1.82 Vmax= Vprelim*(Pl80/Ptd) 5,326 CF N A[�FF�•/TFi1�1 N��•••••N•i•1NNN.•*�M i DONALD F. WARNKE, !R. i i 66671 a .��..i ¢+t�FA IS1 N� �.?= z/ C1.12.8 WEST HANDLEY ELEMENTARY STORM WATER DETENTION CALCULATIONS 100 YEAR ALLOWABLE DISCHARGE FROM SCHOOL SITE-CFS Qa =Ca"i"A Pre-develop Rainfall Drainage Allowable Runoff Intensity Area Discharge Coefficient in/hr Acres CFS Ca i A Qa 0.586 7.98 3.966 18.55 (Time of Concentration= 15 minutes) CRITICAL STORM DURATION-MIN. Td=((2CAab)/Qa))"0.50-b Allowable Developed Drainage Rainfall Rainfall Critical Storm Discharge Runoff Area Factor Factor Duration CFS Coefficient Acres Tarrant Co. Tarrant Co. Min. Qa C A a b Td 18.55 0.608 3.966 322.07 24.388 21 REQUIRED STORAGE VOLUME-CF Vprelim=60 [(CA*a)-(2CabAQa)^0.5 +(Qa/2)(b-tc)J 4,312 CF Developed time of concentration(min) tc 10 3 hour 100 year storm intensity(in/hr) i 1.81 100 yr Critical duration storm intensity(in/hr) i 6.89 3-hour storm depth 100 year storm P180 5.43 Critical duration storm depth 100 year storm Ptd 2.53 Vmax=Vprelim*(P180/Ptd) 9,268 CF OF F�1 i DONALD F. WARNKE, JR. i /..w.............0......... w..� �. ,PF�66�� ON Q04 S !sTE ��/O1V,AL` � 2 7/9'OD.GALV.STEEL TERMINAL POST ' 466 O.D.GALV.i�RAI 7 GA.WIN)GALV. TOP RAIL SLEEV Kl/l TIES R N•C.C. -6'MIN.LENGTH ON POSTS-21•C.C. ON TOP RAIL LV.STRETCHER BAR V/ M9 A.GALV.STEEL CHAIN LINK FABRIC BANDS B IS'CL. V/2-MESH-72' VIDE 2'O.D.GALV.STEEL S-1/v LINE POSGALV. 1.66 O.D.GALV.PIPE BRACE dui+ J/16* 3/4'(MW.)RAT ( w p GAL V.STEEL STRETCHER 11 GA HOG RINGS B a BAR 24'O.C.ON 07 W. (MIN)TENSION WIRE 3/B'GALV.TRUSS R0p SELVAGE TO BE 1'TYP. t V/AD.AISTABLC TRUSS ABOVE CART I , b TIGHTENER WA 1/2' b • h :A VA$N :P NOTE Ip'-0'GC(MAX.) 7n GRADE SMOOTHLY BEFORE SETrRUCTIQI OF FENCE. SET FENCE ACCIRLATELY To GRADE. I �7IPE 7PIPE S.O.D. II�_I PIPE PIPE PIPE TYPICAL FENCE & TERMINAL SECTION TYPICAL LINE POST NO YALE NO SCALE FENCING DETAILS 12'-r O)011Gf r.H•NL9 3 III" Y� -C MIT le CHA-um Tom' �CORRmm F/- ME Cm BM Cm R/ILRr✓ORE r BR GRIT NR OSNMI r GAY muh. (MI NIL SNP W/SLOT NR PAD. NRESIM xr¢R/ LDO(fASid TO OM DOOR ONLY r comma SRI MEIO DOIM SR N HEW MEN STMT[CAST M v �CdIC. t.lY GI9.LRTK fOAVE— T. iilew 1i+DE f_M.TiP — ® � OF 1�1 rOk SR POST ON ----- I NEW FM 1ME.RL OK 0_P\•••••••••���Q 1I Tf r Sm nmT K: FOR me noon ®� WE DONALD•l� •..w.R����J R*r� GATE DETAILS 66671 Aw Q BOIOSS/ANA•• 02-04-15 v C RIAD O PROJECT: FWISD BP003 SCALE AS PER SHEET U.N.O. CIVIL ENGINEERING WEST HANDLEY ELEMENTARY SCHOOL — &LAND SURVEYING SKETCH NO. 4141 BLUE LAKE CIRCLE,SUITE 133 JOB NO.: 13058 DALLAS,TX 75244 FENCE DETAILS 1 13 Tel 972.392.9092 - Firm No.F4373 DATE: 02 FES 2015 STANDARD INLET FRAME&COVER 4'-0'OR 5'-0' 6' 1'-6'or 2'-0'1'-6•a 2'-O. V Se I l o � JE -�BARS - o *E 12'O.CE.W. a V CONC. > � I BUILD UP-'-.. -4 I Q O I \ w I I 1'- 0 /4 BARS BENT BARS,/ STRAIGHT BARS 12•O.C.E.W. SECTION E—E PLAN VIEW N.T.S. N.T.S. STANDARD DROP INLET 18-INCH DEPTH ROCK RIPRAP 18' 9. SUBGRADE COMPACTED 9-INCH BEDDING GRAVEL TO MIN. 95X STD. PROCTOR DENSITY. RIPRAP DETAIL N.T.S. MAXIMUM WIDTH SAWED,PINT (SEE NOTE BELOW) DEPTH 2'±) CE EXISTWG EXISTING ( REINFITRCEMEN4 REINFORCEMENT • . I. ♦• 0 C 0 V - REPLACED CONCRETE SAWED JOINT TO BE A MINIMUM 1'-0 1'-0 (DEPTH- 2"!) 6'THICK CLASS'A• d. 0�®®®�OO COMPACTED FILL ®p, • �'Q oA ® •........ F • FIRM TRENCH WALL PROPOSED MAIN �/ ®*JJff FIRM TRENCH WALL /*•1i•••w•• ••••• DONALD F. WARNKE. JR. CONCRETE 1j 66671 / WT.S ,I oQ 'QFC � ��o NOTE; t aF�.c iS T��N••\�0s PAYMENT TO THE CONTRACTOR FOR REPLACEMENT OF CONCRETE WILL BE BASED ON ACTUAL B ONA MEASUIRMENTS AND UP TO A MAXIMUM WIDTH OF THE OUTSIDE DIAMETER OF THE PIPE PLUS 3'-8'. ANY EXISTING PAVEMENT DAMAGED REMOVED IN EXCESS OF THE MAXIMUM LIMITS,AS NOTED ABOVE,WILL �• BE AT THE EXPENSE OF THE CONTRACTOR. 02-04-15 PAVEMENT CUTS - REMOVAL AND REPLACEMENT PROJECT: FISD BP003 SCALE AS PER SHEET U.N.O. CIVIL ENGINEERING WEST HANDLEY ELEMENTARY SCHOOL &LAND SURVEYING SKETCH NO. 4141 BLUE LAKE CIRCLE,SUITE 133 JOB NO.: 13058 DALLAS,TX 15244 CONSTRUCTION DETAILS C 1 .14 Td 972.392.9092 —_ - - — Firm No.F4373 DATE: 02 FEB 2015 6 6 616 6661616 :1 . , I J 0 7 7 LL. Ld Ac its I LLJ �73dld -t ... � I I jo 10 w u muj cc a".- log , W LLJ u COU z ir S 7-1 i �O j7 zhl N 041, u p%970 _j 9 . (L -7TTI Lb—b + 6 — --- ui > uj C.3 + LAJ 's N. OW, .A L 9 73-7, ...... --- 9 2 1--I-- I I I kil I I 11,7111 11--1-- 110-1121,- 1 oa 7 . . . 7 . . . . . . . . .. . . J4_j PP zx LU -- — ---------- -ITl ;A Z. ;r �z_�z kl_,-I�0 :k Ws n 0 w Z.6 Z.6Z.6 Z.6 Z.Z..0 n TO 6 6;*6 6 6 6 6 6 6 16 6 6 6 > 9 oo Z - —————— k r!, TTI to z C Z. w 4:13 !? 0'3JId 6�,L6 L. 4 4. �; - X 40r10 3dO15 1:0 16:9 0�1*4 1111111 rw 0.1 _14-=1=3103 Pti -1 .33V W3.1 17SI0)L Exhibit "C" CITY OF FORT WORTH STORM WATER 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. STORM WATER FACILITY MAINTENANCE AGREEMENT 9 Rev.09/10/2012 Exhibit "D" STORM WATER FACILITY MAINTENANCE AGREEMENT 10 Rev.09/10/2012 E _m C C z 0 a� C 0 ` E C N Q1 Q N C C r 00 LL .N w w w w w w Y3 c c c c c c c c c c c c c c c d d o w m d d d d m d m (D a) m E E E E E E E E E E E E E E E > E E E E E E E E E E E E 0 O O O O O 0 0 0 0 0 0 0 U U 0 E U U U U U U U U U U U U N 0 0 0 0 0 O ° p o Z Z °It Z z z° Z Z Z Z ZI Z Z z Z ZI Z O I I I I I I I I i I NI NI NI I N N N N N N a) a) Q) m N a) } } } O H " Cl. Z i m N W o� r: p w v v O U tN C O a) y D 0 ° v 0 o ° O U a) W d 0 c c o as = N cr Cl. 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