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HomeMy WebLinkAboutSW8950711_HISTORICAL FILE_19951221STORMWATER DIVISION CODING SHEET POST -CONSTRUCTION PERMITS PERMIT NO. SW8 Q S 07 11 DOC TYPE ❑ CURRENT PERMIT ❑ APPROVED PLANS HISTORICAL FILE ❑ COMPLIANCE EVALUATION INSPECTION DOC DATE 8 12 21 YYYYMMDD State of North Carolina F5VA Department of Environment, Health and Natural Resources 4� Division of Environmental Management 111 A James B. Hunt, Jr., Governor C A Jonathan B. Howes, Secretary ID C i V A. Preston Howard, Jr., P.E., Director December 21, 1995 Mr. Mark L. Maynard Cardinal Associates, L.L.C. Post Office Box 5601 Wilmington, North Carolina 28403 Subject: Permit No. SW8 950711 Modification Cardinal Trade Center High Density Stormwater Project New Hanover County Dear Mr. Maynard: The Wilmington Regional Office received the modification to the Stormwater Application for Cardinal Trade Center on December 5, 1995, with final information on November 8, 1995. Staff review of the plans and specifications has determined that the project, as proposed, will comply with the Stormwater Regulations set.forth in Title 15A NCAC 2H.1000. We are forwarding Permit No. SW8 950711 dated December 21, 1995, to Cardinal Associates, L.L.C. This permit shall be effective from the date of issuance until December 5, 2005 and shall be subject to the conditions and limitations as specified therein. Please pay special attention to the Operation and Maintenance requirements in this permit. Failure to establish an adequate system for operation and maintenance of the stormwater management system will result in future compliance problems. If any parts, requirements, or limitations contained in this permit are unacceptable, you have the right to request an ajudicatory hearing upon written request within thirty (30) days following receipt of this permit. This request must be in the form of a written petition, conforming to Chapter 150B of the North Carolina General Statutes, and filed with the Office of Administrative Hearings, P.O. Drawer 27447, Raleigh, NC 27611-7447. Unless such demands are made this permit shall be final and binding. If you have any questions, or need additional information concerning this matter, please contact Linda Lewis, or me at (910) 395-3900. Sincerely, 1 ale, Dave Adkins Regional Water Quality Supervisor DA/arl: S:\WQS\STORMWAT\PERMIT\95071LDEC cc: Jim Honeycutt. P.E. Alan Golden, New Hanover County Inspections Beth Easley, New Hanover County Soil Erosion Linda Lewis Wilmington Regional Office Central Files P.O. Box 29535, Raleigh, North Carolina 27626-0535 Telephone 919-733-5083 FAX 919-733-9919 An Equal Opportunity Affirmative Action Employer State Stormwater Management Systems Permit No. SW8 950711 STATE OF NORTH CAROLINA DEPARTMENT OF ENVIRONMENT, HEALTH AND NATURAL RESOURCES DIVISION OF ENVIRONMENTAL MANAGEMENT STATE STORMWATER MANAGEMENT PERMIT HIGH DENSITY DEVELOPMENT In accordance with the provisions of Article 21 of Chapter 143, General Statutes of North Carolina as amended, and other applicable Laws, Rules, and Regulations PERMISSION IS HEREBY GRANTED TO Cardinal Associates, L.L. C. Cardinal Trade Center New Hanover County FOR THE construction, operation and maintenance of stormwater management systems in compliance with the provisions of 15A NCAC 2H .1000 (hereafter referred to as the "stormwater rules') and the approved stormwater management plans and specifications and other supporting data as attached and on file with and approved by the Division of Environmental Management and considered a part of this permit. This permit shall be effective from the date of issuance until December 5, 2005 and shall be subject to the following specified conditions and limitations: I. DESIGN STANDARDS This permit is effective only with respect to the nature and volume of stormwater described in the application and other supporting data. 2. This stormwater system has been approved for the management of stormwater runoff as described on page 3 of this permit, the Project Data Sheet. 3. Approved plans and specifications for this project are incorporated by reference and are enforceable parts of the permit. 2 State Stormwater Management Systems Permit No. SW8 950711 DIVISION OF ENVIRONMENTAL MANAGEMENT Project Name: Permit Number: Location: Applicant: Mailing Address: Application Date: Water Body Receiving Stormwater Runoff: Classification of Water Body: If Class SA, chloride sampling results: Pond Depth: Permanent Pool Elevation: Total Impervious Surfaces Allowed: Offsite Area entering Pond: Green Area entering Pond: Required Surface Area: Provided Surface Area: Required Storage Volume: Provided Storage Volume: Temporary Storage Elevation: Controlling Orifice: PROJECT DATA Cardinal Trade Center 950711 New Hanover County Mr. Mark L. Maynard Cardinal Associates, L.L.C. Post Office Box 5601 Wilmington, North Carolina 28403 December 5, 1995 Bradley Creek "SC HQW" N/A 7.0 feet 38.8 MSL 89,962 square feet N/A square feet 13,496 square feet 3,846 square feet 3,850 square feet 7,467 cubic feet 7,509 cubic feet 40.43 MSL 1.25" pipe Q State Stormwater Management Systems Permit No. SW8 950711 4. No homeowner/lot owner/developer shall be allowed to fill in, alter, or pipe any vegetative practices (such as swales) shown on the approved plans as part of the stormwater management system without submitting a revision to the permit and receiving approval from the Division. 5. The following items will require a modification to the permit: a. Any revision to the approved plans, regardless of size. b. Project name change. C. Transfer of ownership. d. Redesign or addition to the approved amount of built -upon area. e. Further subdivision of the project area. In addition, the Director may determine that other revisions to the project should require a modification to the permit. 6. The Director may notify the permittee when the permitted site does not meet one or more of the minimum requirements of the permit. Within the time frame specified in the notice, the permittee shall submit a written time schedule to the Director for modifying the site to meet minimum requirements. The permittee shall provide copies of revised plans and certification in writing to the Director that the changes have been made. H. SCHEDULE OF COMPLIANCE 1. The permittee will comply with the following schedule for construction and maintenance of the stormwater management system: a. The stormwater management system shall be constructed in it's entirety, vegetated and operational for it's intended use prior to the construction of any built -upon surfaces except roads. b. Daring construction, erosion shall be kept to a minimum and any eroded areas of the system will be repaired immediately. 2. The facilities must be properly maintained and operated at all times. The approved Operation and Maintenance Plan must be followed in it's entirety and maintenance must occur at the scheduled intervals. 3. The permittee shall at all times provide the operation and maintenance necessary to assure the permitted stormwater system functions at optimum efficiency including, but not limited to: a. Semiannual scheduled inspections (every 6 months). b. Sediment removal. C. Mowing and revegetation of side slopes. d. Immediate repair of eroded areas. e. Maintenance of side slopes in accordance with approved plans and specifications. f. Debris removal and unclogging of outlet structure, orifice device and catch basins and piping. g. Access to the outlet structure must be available at all times. 2 State Stormwater Management Systems Permit No. SW8 950711 4. Records of maintenance activities must be kept and made available upon request to authorized personnel of DEM. The records will indicate the date, activity, name of person performing the work and what actions were taken. 5. This permit shall become voidable unless the facilities are constructed in accordance with the conditions of this permit, the approved plans and specifications, and other supporting data. 6. Upon completion of construction, prior to issuance of a Certificate of Occupancy, and prior to operation of this permitted facility, a certification must be received from an appropriate designer for the system installed certifying that the permitted facility has been installed in accordance with this permit, the approved plans and specifications, and other supporting documentation. Mail the Certification to the Wilmington Regional Office, 127 Cardinal Drive Extension, Wilmington, North Carolina, 28405, attention Water Quality Section. 7. A copy of the approved plans and specifications shall be maintained on file by the Permittee for a minimum of ten years from the date of the completion of construction. III. GENERAL CONDITIONS 1. This permit is not transferable. In the event there is a desire for the facilities to change ownership, or there is a name change of the Permittee, a formal permit request must be submitted to the Division of Environmental Management accompanied by an application fee, documentation from the parties involved, and other supporting materials as may be appropriate. The approval of this request will be considered on its merits and may or may not be approved. 2. Failure to abide by the conditions and limitations contained in this permit may subject the Permittee to enforcement action by the Division of Environmental Management, in accordance with North Carolina General Statute 143-215.6(a) to 143-215.6(c). 3. The issuance of this permit does not preclude the Permittee from complying with any and all statutes, rules, regulations, or ordinances which may be imposed by other government agencies (local, state, and federal) which have jurisdiction. 4. In the event that the facilities fail to perform satisfactorily, including the creation of nuisance conditions, the Permittee shall take immediate corrective action, including those as may be required by this Division, such as the construction of additional or replacement stormwater management systems. 5 State Stormwater Management Systems Permit No. SW8 950711 5. The permit may be modified, revoked and reissued or terminated for cause. The filing of a request for a permit modification, revocation and reissuance or termination does not stay any permit condition. Permit issued this the 21st day of December, 1995. NORTH CAROLINA ENVIRONMENTAL MANAGEMENT COMMISSION for A. Preston Howard, Jr., P.E., Director Division of Environmental Management By Authority of the Environmental Management Commission Permit Number SW8 950711 Z State Stormwater Management Systems Permit No. Sw8 950711 Cardinal Trade Center Stormwater Project No. 950711 New Hanover County Engineer's Certification 1, , as a duly registered Professional Engineer in the State of North Carolina, having been authorized to observe (periodically/weekly/full time) the construction of the project, for (Project Owner) hereby state that, to the best of my abilities, due care and diligence was used in the observation of the project construction such that the construction was observed to be built within substantial compliance and intent of the approved plans and specifications. Signature Registration Number Date 7 DETENTION POND ANALYSIS PROJECT #: SW8 950711 PROJECT NAME: Cardinal Trade Center Drainage Basin: Bradley Creek Drainage Area IMPERVIOUS AREA % IMPERVIOUS FILE NAME: S:\WQS\POND\950711.WK1 REVIEWER: arl DATE: 21—Dec-95 Class: SC HQW Chlorides: n/a /ii. 97_ 74-4 -/11 1 UbbaU square feet 108630 square feet Area in Acres 2.49380165 acres Buildings Concrete Asphalt TOTAL 82.82% SURFACE AREA CALCULATION SA/DA Req. SA Prov. SA VOLUME CALCULATION Green Bottom Perm. Pool Design Pool Design SA Req. Volume Prov. Volume ORIFICE CALCULATION Runoff Coefficient 28780 1 3665 0.95 57517 0.95 square feet Pond Depth 3.541 % 3846.32 square feet 3850' square feet Adjusted SA 28780 Adjusted SA 3481.75 Adjusted SA 54641.15 TOTAL 86902.9 7 TSS: [From plan Contours] [From plan Contours] Avg. Head = 0.7889583 ft Flow Q2, cfs 0.04345723 Area, in2 1.463198 Dia 2, inches Flow Q5, cfs 0.01738289 Area, in2 0.585279 Dia 5, inches Engineer uses 1.25 Inches Area = 1.2271846 in2 Q, cfs = 0.0364475 Drawdown = 2.3846433 days COMMENTS Surface Area, Volume and Orifice are within Design Guidelines. rR DIVISION OF ENVIRONMENTAL MANAGEMENT NORTH CAROLINA STORMWATER MANAGEMENT PERMIT APPLICATION�p qy��} I. GENERAL INFORMATION I. Project Name D cA2 I1JAL -r2ApE o CrrER DEC 051995 2. Location, directions to project (include County, Address, State Road) Attach map. New H iCW0yE12 CO. CA2DINAL. D21vE EXTENSION 3.Owner'sName CA2Dir-AL PtSSOCIATEE LLC Phone 910- 7g9-52.(P4 4.Owner's Mailing Address P• 0 • BOX S(00 1 city W I L_ al i NGTO N State N C zip X 4 0 3 5. Application date(A.gS- Fee enclosed $ 6. Nearest Receiving Stream g 12AD LEY G2 EEK Class SC H Q W 7.Projectdescription OFFICE IWHSE s 2ET,+IL. II. PERMIT INFORMATION I. Permit No. (To befiaedinbyoear) 5Gu8 9/5071( 2. Permit Type New Renewal V Modification(existing Permit No.) S U 3 q 5 011 I 3. Project Type: _Low Density _Detention_ Infiltration Other:_ Redevelop _General _Dir Cert 4. Other State/Federal Permits/Approvals Required (Check appropriate blanks) CAMA Major Sedimentation/Erosion Control V 404 Permit III. BUILT UPON AREA (Please see NCAC 211.1005 thru .1007for applicable density limits) Drainage Drainage Breakdown of Impervious Area Basin Basin (Please indicate below the design impervious area) Classification SC Buildings a91 f? 90 Ss• Pr Allowable Impervious Area 0.741acu Total Project Area 2.49 Ctcr2, Proposed Impervious Area a1 .0 y 04 LL % Impervious Area IV. STORMWATER TREATMENT (Describe how the runoff will be treated) WET POn1D Streets NLA Parking/SW & 0 ) 1 R.2 Sa FT. Totals R8i9UP, Sa.rr. A . o4 A a.E �i Ik V. DEED RESTRICTIONS AND PROTECTIVE COVENANTS Deed restrictions and protective covenants are required to be recorded for all low density projects and all subdivisions prior to the sale of any lot. Please see Attachment A for the specific items that must be recorded for the type of project applied for. By your signature below, you certify that the recorded deed restrictions and protective covenants for this project shall include all the items required by the permit, that the covenants will be binding on all parties and persons claiming under them, that they will run with the land, that the covenant cannot be changed or deleted without concurrence from the State, and that they will be recorded prior to the sale of any lot. VI. OWNER'S CERTIFICATION VII. tK* 1, /U#'a I.. A'4-iWAA-9 , certify that the information included on this permit (Pleaee pint or type name clearly) application form is correct, that the project will be constructed in conformance with the approved plans, that the deed restrictions will be recorded with all required permit conditions, and that to the best of my knowledge, the proposed project complies with the requirements of 15A NCAC 2H.1000. 1 authorize the below named person or firm to submit stormwater plans on my behalf. Authorized Agent AGENT AtMIORIZATION (MUST BE COMPLETED) Date Person or firm name NONENCUTT "GINemirIG cornPRNY Mailing Address P.o. B0X 1503(0 City WILM1N6TON State NC Zip 2g408 Phone 910— 950-0031 Please submit application, fee, plans and calculations to the appropriate Regional Office. Applicant/WiRO//Central Files Office use only STURAPIATER DEC 0 5 1"5 D E M l? OJ #'SWS9S0711 Drainage Calculations for Cardinal Dr. Trade Center, Wilmington, NC Project 5042 7/20/95 Revised 11/5/95 A _ 108630 A 2.4938 acres ...total area Revised 12/4195 total 43560 total = A paved p := 56517 A = 1.297 acres ...paved area paved 43560 A side - 3665 A = 0.084 acres ...sidewalk area side 43560 A bidg " 28780 A bidg = 0.661 acres ...Total area of buildings 43560 A imp A paved + A side A imp = 1.382 acres - total impervious area excl. bldgs A other A total - A imp - A bldg A other = 0.452 C pre := .20 ...pre -development C C bldg := 1.00 C imp := .95 ...paved area C C imp C pro 1 A total) + C imp, total, + C bldg' �A total / C comp = 0.83 ...composite C (post -development) L 750 ft •••hydraulic length H := 311 ...height 3/. 385 - (128 H T T c = 10.71 minutes STORWIN TER I�uu�(UUU Do DEC 0 5 1"S rROJ 5W 8 _50? ( I( ...time of concentration Intensity -Duration -Frequency Relationships: Values of G and H* R G H 10 252 30 50 338 33 R= Return Period *Source: Master Drainage Plan for City of Wilmington '" Cq / ,o�P,.. O =� pFESSiw0 * SEAL j 9524 >t .,ill tort, %i oq rvA!IIlI!I1G'y'C u kj= E56IM1asl;c 20 330 3� LJ j 23 ii- O v IH iyvii2tfi•rv���^rutp�-_ g; ir,^IJC;.!4C-!Sr1n_OPIQ Fair ril rYV �1 �'G: ii: Cfy�;li H . 1 r, 120 I _ tY 2 cQWDu2;lE G .Q2[ yBAS�uD' '3L'Ii cou-1b _ . bLG •�Sg! 11 .. r. !Wb I / l yj ... i,; _ his b.. � „v - 'j(i :,'.—,.-'i:3ASj'Jill:.:tbi:i 1„ (,; � Ir OS�' i0rai i,l, hlrgr �.rllcl . i1`_.1b ;y - ba Cr -.` 21C!^J iti?'.�, _ V.,- t' - r:r a i-, _ica it r .irriJ sme2 - 16,_i !wbGLA *rig ` b: _i rlg82 i3IO IS'el ..L.58 — n 2iGc- _ . Wcl a1Gb Gci.52 2q.ems;x `1e2 - b. r`cJ.:'sq � �.�ti .bUASCq = j70 9C18?. 'bSABfJ EfiS^, �E2!A - . MIS! 1222c= .v • 1 / 465 _ oiBCf 201 PIS! R Lec _ S; l8a �F.1.1 �iLta QLQU3CC. C!3jC'fj3'!C ? 1.;L C0Lq!L'"^_-i Jat' f t3^u yjv T := T, Time of duration G 10 := 252 H10:=30 :_ G 10 10 (H10rT) G 50 := 338 H 50 := 33 G 50 150 := (H 50 T) Compute runoff rates: Page 2 110 = 6.19 in/hr ...10 year stone intensity 150 = 7.733 in/hr ...50 year storm Q pre C pre' 1 10'A total Q pre = 3.09 cfs ...pre -development runoff from 10 yr. storm Q 10 C comp' 110'A total Q 10 = 12.77 cfs •.•post -development discharge rate from 10 yr. storm Q 50 C comp' 1 50.A total Q 50 = 15.96 cfs ...post -development discharge rate from 50 yr. storm Volume of runoff from developed area of site: P := 4.8 in Soil type = Seagate CN := 70 Curve No. S := 1100 I - 10 S = 4.286 1111CN/(P- 0.2•S)2 R depth := P .8 S R depth = 1.889 in. ...runoff depth R vol R depth' (A total' 43560. 11 2 R Vol = 17103 cubic feet ...total runoff volume T R depth' (A total 43560. 1 p 1.39•(Q 10) (-L 12) 60 T p = 16.05 ...time to peak flow Jo listC. y'Snw., i0131` 1 Grid!. tGCj... 1C1s1 LnUO4ACI;{UJs A qVip 1. 47 U Z• 2 3 C{1 7- 101 yL: �uil jib+� _ �eses�e O C'� iil j;011-1WEi ++S U-MO P-1-1w q&!c Ea ObGQ 5L'v5 Cb cilc .LOU04 q�;btp .,,� "ter-,�c..�'uC^�Ei:: n!3CPSL,,� ,G •LC AL' 24�LY� •i � tit. ..iG 'Gi � i e �1: �f G CLi fi C COLub ,=iJ. �.,/ 1oiS1 i ._2 "'bO? - GA6Ob-WGU G12. 5Lv6 L8 �L 6 LLCW ' i AL' 210LW = JJ �_ 1 fil I � �% � r� �%i, � o 1 c !G r n 1 _ �2�. tVl Cl_ CC..S-:3...AotC�j1...L': UI:JOi lCOI....1 COfi1i IfG LnUC . L`^r62 i_ { r i _ .... . _ . C Qu _ �a cootl .—I - RD In ! 4 U_ ?'1 !1!11JL " !o nGjL 2i0I.U; !U1` L12!1%-. l., y!WG 01 rnLZ1fIOU L a8a v Determine size of 7' deep pond without vegetative filter: Page 3 IMP% := A imp + A bidg IMP% = 0.819 A total IMP% 80 := .034 IMP% g0 := .039 IMP := IMP% 80 + IMP% 90 - IMP% 80)•.19 IMP = 0.03495 DA := A total-43560 SA != (IMP)•DA SA = 3797 Determine storage volume required for treatment of first Inch of runoff: C Comp = 0.827 V 122.A total- 43560•C comp V = 7491 cubic feet Assume 110' x 35' pond. Solve for depth "d" to provide required storage: 1 := 110 w := 35 w•I = 3850 d := 1.5 ...guess value I•w+(I+6•d)•(w+6•d) f(d) := .d ...function of d for rectangular pond w/3:1 side 2 g(d) := V slopes d := root((f(d) - g(d)),d) d = 1.63 ft. - depth required to provide required storage for 1 inch Q 2day 2.24 60.60 Q 2day = 0.0433 cis ...Max discharge for 2 day drawdown V Q 5day '- 5.24.60.60 Q 5day = 0.0173 cfs... Max discharge for 5 day drawdown g := 32.2 h:=d h=0.813ft 2 A orifice _ Q 2day Cd.(2.g.h).5 C d := .6 ...orifice coefficient ..avg. head A orifice = 0.01 Square ft. f �c'G :lBfEli 9'vlfE't:arge; 3uQF{?!�' bti4� �rgEt 'C fo Q•t12 9RtfiiS9}5i1 _ i33Cct !91 d ,-''eKW.0 = ,MlI :FTr S !`+ 7� Cia �?1 �2ii7 'i ;n9 [7ba A 6;u a (grvF„ aJ.0 - LSif7D^. eeE'E'?fe be-flupei ehlveiq of "b•' tffgeb iE? ev!O?..br?!z '4C- t 'DPP SlFY."?aA S?Ji21':;.iVriiin;m,�-ISWRM3109'Il0ibT6noI;anlJi... r v )iiOtiT !? rynn -> en- u ti: -pel -,ins ! h_r, ' ps', rife` b - 7�+1 .Jw_r��' j �:+�.j..r... r S4'I: �.:C �. 1J.• •ii.•.•J � i.y , rival WFlb Pli 10,1 f..m G^,fjaaih x-nm... Fig: F; $,n r z �, 0i t(nv= (iivuS%i r'♦.-.h ,alb = iQ •. __ �+ia i7 rir ... �i:. y1 i U,tJ - n r} l7a•oa A orifice 5 Page 4 D := 4 12 D = 1.353 in. - for 2 day drawdown 3.14 ) Q 5day = 0.0173 cis A orifice :_ Q 6day A orifice = 0.004 Square ft. Cd,(2.g_h).5 5 D := 4. A orifice 12 D = 0.856 in - for 5 day drawdown 3.14 Use 1.25 inch diameter pipe in routing chart Check capacity of emergency spillway to pass 50 year peak flow: L := 16 ft ...Length of weir H := 12 ft ...Driving head C w := 3.0 ...Weir coefficient Q := C w L• H1.5 ...Weir capacity Q = 16.97 must be => Q 50 = 15.96 O.K. Using a 12" barrel, check velocity at outlet: D := 1 ft q := 4.91 ...max barrel discharge from routing sheets m DZ A pipe := 4 A pipe = 0.785 V outlet A q V outlet = 6.25 fps pipe Determine outlet apron dimensions and riprap size for discharge from pond: From Figure 8.06.b.1 and Figure 8.06.b.2 choose Zone 1. L a := 3• D L a = 3 ft - minimum length of apron from figure 8.06b2 W := 3• D W = 3 ft - minimum width of apron from figure 8.O6b2 dia 3 diameter of stone in inches t := 12 thickness of apron in inches REFER TO ATTACHED SHEETS FOR ROUTING RESULTS Note: References to chart nos., table nos., and page nos. refer to Erosion and Sediment Control Planning and Design Manual unless noted otherwise �Inr:gIW6Jt '�OUILOJ ',` i-SLhill10 5U,4 DGaidU ij 5sun5j iili;6aa UOj6y an;GJvllas �i_cCL. S.'-.) ^ice Wl; HEiJ -. t--t IEcE -' :, c7C{ Lb�C.11 11.it•'i �' i�cCt II Gi E!QW[J EU IU US2 y!S 2 i:1aUJ9j6L O{ afOU6 EU !UCpGa /�i •?, LJ /:'1 = .'t. 1 - LL'Ii!iwiiw h',d3 p of FsbLUU ELUUJ ij;71iu� 57 314'F�j Cy1t)C2S 'C�CUv I. r1b.6E.tU!!;; ofinvef -'.l.7LCU CEl1Aai)21CL'2 `!1jU Llb-.13I) 21SS LCL 02COSLa6 1LCEdJ bCL'O: bit'" W IJ -.4, _'t l; it t "0 . U)S < L�JE.Lw ::2C UL�6 .LOUJ IAC•',UQ "d�J_G fj0lL:� u s J." ;`•aLfiis :iE@Oyi . �30i:CA 5j Gi:rEc. Lf - H ^ !A it ifl iII:=,Ff". ^ �°•` r ?'", iC.i: i_:_1fini: :iC-;ir :-S22 R +A,R4f_ h_2: r•: 37Ahk: r`c ..r !L':.->- (i_IUC1 3L t ul. , U mac.`. IEi ,C4 w:�i, u:.w v,(vj'.'A%.i.P 1 C Llf;C• .t y°r1 �A " LG w,f'Vl.'y:11 $ Z CONTOUR INCR ACCUM CONTOUR AREA VOL VOL STAGE In S In Z Z est 38.80 3850 0 0 0.00 0.00 39.30 4294 2036 2036 0.50 7.6187 -0.6931 0.51 39.80 4756 2263 4299 1.00 8.3660 0.0000 0.98 40.43 5364 3188 7486 1.63 8.9208 0.4886 1.59 40.80 5734 2053 9539 2.00 9.1632 0.6931 1.96 41.30 6250 2996 12535 2.50 9.4363 0.9163 2.48 41.80 6784 3259 15794 3.00 9.6674 1.0986 3.03 42.30 7336 3530 19324 3.50 9.8691 1.2528 3.61 Regression Output: Constant 8.38666 Ks= 4388 Std Err of Y Est 0.029838 b= 1.15 R Squared 0.998808 No. of Observations 7 XCoefficient(s) 1.1W53 Sid Err of Coef. 0.017832 �21 4 4 CL. cu (' I-1.) it C, in is t" -1. 4 W R) W, il) in (,I I- co I I-0 U, IL RI"1 11) W cr it '7j -1 CC. I A. 4 M ..'1 0 11 it it (fi it) C.; cz: > it ct) di 0 0 cl it, W I-) Lq 11 a 'c' 0) 1) in It) .a 't, II it 11) CX It 11 C, 0 It On CO Q) 0) 0! (;j is oj (I) Ix) 01 4 (7) a, C'.T CA ((1 1.) Q) a;Gj "D It CC, ri) Q) D C* (11 :0 ;D �o 0*1 0:) (P c; -r' (6 r ct II 11 51 11) 11.1 (ol Q) /I. r.; ru 7, X! It M 0) (1) 1* STAGE -DISCHARGE FOR RISER/BARREL SPILLWAY WITH EMERGENCY WEIR RISER/BARREL: 7.5 Dr = 3.516 Area of grate openings Etop = 40.43 Elev. top riser (ft) Cwr = 3 Riser weir coefficient Cdr = 0.59 Riser orifice coefficient Do = 1.25 Orifice dia.(in) Einv = 38.80 Elev inv. orifice (ft) Co = 0.6 Orifice coeff. Db = 1 ft. Binv = 38.80 Barrel invert Cdb = 0.6 EMERGENCY WEIR: Cw = 3 Weir coefficient Ecr = 41.00 Elev. weir crest (ft) Lw = 16 Weir length (ft) 1 2 3 4 5 6 7 8 Stage Riser Riser Barrel 1.25" Princ. Emerg. Total (weir) (orifice) orifice Spillway Weir Outflow [ft] [efs] [ifs] [cf8] [cfs] [cfs] Ids] [cfsl 38.80 0.00 0.00 0.00 0.00 0.00 0.00 0.00 39.05 0.00 0.00 0.00 0.02 0.00 0.00 0.02 39.30 0.00 0.00 0.00 0.03 0.00 0.00 0.03 39.55 0.00 0.00 0.00 0.04 0.00 0.00 0.04 39.80 0.00 0.00 0.00 0.04 0.00 0.00 0.04 40.05 0.00 0.00 0.00 0.05 0.00 0.00 0.05 40.30 0.00 0.00 0.00 0.05 0.00 0.00 0.05 40.55 0.94 5.77 5.00 0.05 0.94 0.00 0.99 40.80 5.06 10.13 5.35 0.06 5.06 0.00 5.12 41.05 10.98 13.11 5.67 0.06 5.67 0.54 6.21 41.30 18.26 15.53 5.98 0.06 5.98 7.69 13.86 41.55 26.67 17.62 6.27 0.07 6.27 19.58 25.85 41.80 36.08 19.49 6.55 0.07 6.55 34.35 40.89 42.05 46.39 21.19 6.81 0.07 6.81 51.64 58.46 42.30 57.54 22.76 7.07 0.08 7.07 71.15 78.22 42.55 69.45 24.24 7.32 0.08 7.32 92.63 99.95 42.80 82.09 25.63 7.56 0.08 7.56 115.92 123.48 eem� as errim9cp clo!3 i = S ma ma «a = oa y :. . as m »a 0.o ea se wa ve m< a+ 2, on 9, 2, m, ma on e e e3 2a: Me as me A: 2a ma s» ms », 2« ea kn m, m& «n m> 90 m, a a 2s 2t m« 32 22 2» 2a 20 se Ae es w; UO.0 ez w< e wn mn +2 se .1 st +, t « \ \\ \ \ \\ \ % \% ay. \ ye «m e« «n «! 29 me s» \« \: \±\ ye g< sa 23 ee Pr Rx R» aG, e«, a2 Dn em e6 92 «» COMPOSITE STAGE DISCHARGE 60 80 70 60 m 50 O K 6 S U N 'p 40 30 20 10 0 r1 m o en m m n m m n m m STAGE 1-4-R(W) tR(0) -d-BARREL -D(-ORIFICE W, 0 io 'v: i•i 'vi ._� - is >u BOAT; DISCHARGE 38.8 39.3 39.8 40.3 40.8 w O 41.3 m 41.8 j 42.3 0 42.8 m n y 3e^ARNO8i0 m CHAINSAW ROUTING Input data: Qp= 12.77 RESULTS: Tp= 16.1 OUTFLOW PEAK= 4.96 MAX STAGE= 40.98 dT= 1.6 Ks= 4388 b= 1.15 7.5 Etop = 40.43 Top of riser Or = 3.516 Area of grate openings Db= 1 Binv= 38.8 N= 1 No. of orif. Cd= 0.6 Orifice coeff. D= 1.25 Dia. of orifice Zi= 38.8 Inv. elevation Cw= 3 Weir Coefficient L= 16 Length of overflow weir ZCr= 41 Elev. of overflow weir In oz G; `� m �i`. cup >< � rr y ITI �r. It I Cti 11 II II II II it ti II II 11 II jl 11 II m n- a3 On c, m ' 111 C -m Al f- 1, - m c . b 1 2 3 4 5 6 7 8 TIME INFLOW STORAGE STAGE OUTFLOW ORIFICE WEIR RISER/ [min] [cts] [cu ft] [ft] [cfs] [cfs] [cfs] BARREL 0 0.00 0 38.8 0.00 0.000 0.00 0.00 1.6 0.31 0 38.80 0.00 0.000 0.00 0.00 3.2 1.21 30 38.81 0.00 0.000 0.00 0.00 4.8 2.62 146 38.85 0.00 0.003 0.00 0.00 6.4 4.39 397 38.92 0.01 0.011 0.00 0.00 8 6.35 817 39.03 0.02 0.017 0.00 0.00 9.6 8.32 1426 39.18 0.02 0.023 0.00 0.00 11.2 10.10 2222 39.35 0.03 0.029 0.00 0.00 12.8 11.52 3189 39.56 0.03 0.034 0.00 0.00 14.4 12.44 4292 39.78 0.04 0.040 0.00 0.00 16 12.77 5482 40.01 0.04 0.044 0.00 0.00 17.6 12.48 6704 40.24 0.05 0.048 0.00 0.00 19.2 11.59 7897 40.46 0.19 0.052 0.00 0.14 20.8 10.28 8992 40.66 2.57 0.055 0.00 2.51 22.4 9.03 9732 40.79 4.67 0.057 0.00 4.62 24 7.93 10151 40.87 4.79 0.058 0.00 4.73 25.6 6.97 10453 40.92 4.87 0.059 0.00 4.81 27.2 6.12 10654 40.96 4.92 0.060 0.00 4.86 28.8 5.38 10770 40.98 4.95 0.060 0.00 4.89 30.4 4.72 10811 40.98 4.96 0.060 0.00 4.90 32 4.15 10788 40.98 4.95 0.060 0.00 4.89 33.6 3.65 10711 40.97 4.93 0.060 0.00 4.87 35.2 3.20 10587 40.95 4.90 0.059 0.00 4.84 36.8 2.81 10424 40.92 4.86 0.059 0.00 4.80 38.4 2.47 10228 40.88 4.81 0.058 0.00 4.75 40 2.17 10004 40.84 4.75 0.058 0.00 4.69 41.6 1.91 9756 40.80 4.68 0.057 0.00 4.62 43.2 1.68 9490 40.75 4A5 0.057 0.00 4.09 44.8 1.47 9253 40.71 3.37 0.056 0.00 3.31 46.4 1.29 9071 40.68 2.80 0.055 0.00 2.75 48 1.14 8926 40.65 2.38 0.055 0.00 2.32 49.6 1.00 8806 40.63 2.05 0.055 0.00 1.99 51.2 0.88 8706 40.61 1.78 0.054 0.00 1.73 52.8 0.77 8619 40.59 1.56 0.054 0.00 1.51 54.4 0.68 8543 40.58 1.38 0.054 0.00 1.32 56 0.59 8476 40.57 1.22 0.054 0.00 1.17 57.6 0.52 8416 40.56 1.09 0.054 0.00 1.03 59.2 0.46 8361 40.55 0.97 0.053 0.00 0.92 60.8 0.40 8312 40.54 0.87 0.053 0.00 0.81 62.4 0.35 8268 40.53 0.78 0.053 0.00 0.73 64 0.31 8227 40.52 0.70 0.053 0.00 0.65 65.6 0.27 8189 40.52 0.63 0.053 0.00 0.58 67.2 0.24 8155 40.51 0.57 0.053 0.00 0.52 68.8 0.21 8123 40.51 0.52 0.053 0.00 0.46 70.4 0.19 8094 40.50 0.47 0.053 0.00 0.41 72 0.16 8067 40.49 0.42 0.053 0.00 0.37 n'n0 n'35. :.'L'g 'l S _ '.IO'•_ 1 G c... _ .'C.�S i JG G':L �c'__ g ij'\,\ g6jJn d!I'-A rir, !' _ ;'GG LeO@ dG BJ J G iJ ac= GG J 4C O'OG C'Ca aL V Ov G UCC' ii Gi? gV' ='gg iciJJ 10". d'_1_ .9C; n'no QgS 17 c'_S JOLJJ 40'ag cae G'GGO 0'OC a'S('G "F g C :: fT � OL 0 It C'H Q ! � .. _.�G n'Un J *_3 'G'c5 �'e a O c u UG Fna -Q JCJ2J Qn'g_ Sp, & nrn_g r_:rn q' L G'Q 1C''Se Laos dJ OG __ O'022 0'GO S 2J _ J:i'iS _ PBS 10'OJ O'Gd G U, J _ G nri G C, G G G CO., G Go n'nn - - - - n G_ G ,. _ .._ U- OGJ G'OJJ _'GO r'GG g E Ju? _g'g_ n'n:; n nn; } rip n'nn t � cnn _.._ n.__ .'oG .. .. : ; C. nsr. l. n .: 00 a G'OGt:u a 00 I ( {ti lda ( 1 i �_-I Rt:KiSEf v, r ,_ :: r•✓+_�7' n, � : �n : ,_rn::P "v::..,nr" nn_e'ii: i;,nr,: , Ij 1 2 3 4 5 6 7 8 TIME INFLOW STORAGE STAGE OUTFLOW ORIFICE WEIR RISER/ [min] [cfs] [cu ft] IN [ofs] [cfs] [cfs] BARREL 73.6 0.14 8042 40.49 0.39 0.052 0.00 0.33 75.2 0.13 8019 40.49 0.35 0.052 0.00 0.30 76.8 0.11 7997 40.48 0.32 0.052 0.00 0.27 78.4 0.10 7977 40.48 0.29 0.052 0.00 0.24 80 0.09 7958 40.47 0.27 0.052 0.00 0.21 95 0.03 7794 40.45 0.09 0.052 0.00 0.04 110 0.01 7733 40.43 0.06 0.052 0.00 0.01 125 0.00 7688 40.43 0.05 0.051 0.00 0.00 140 0.00 7644 40.42 0.05 0.051 0.00 0.00 155 0.00 7598 40.41 0.05 0.051 0.00 0.00 170 0.00 7553 40.40 0.05 0.051 0.00 0.00 185 0.00 7507 40.39 0.05 0.051 0.00 0.00 200 0.00 7461 40.38 0.05 0.051 0.00 0.00 215 0.00 7415 40.38 0.05 0.051 0.00 0.00 230 0.00 7370 40.37 0.05 0.050 0.00 0.00 245 0.00 7324 40.36 0.05 0.050 0.00 0.00 260 0.00 7279 40.35 0.05 0.050 0.00 0.00 275 0.00 7234 40.34 0.05 0.050 0.00 0.00 290 0.00 7189 40.33 0.05 0.050 0.00 0.00 305 0.00 7144 40.33 0.05 0.050 0.00 0.00 320 0.00 7099 40.32 0.05 0.050 0.00 0.00 335 0.00 7054 40.31 0.05 0.050 0.00 0.00 395 0.00 6876 40.28 0.05 0.049 0.00 0.00 455 0.00 6700 40.24 0.05 0.048 0.00 0.00 515 0.00 6526 40.21 0.05 0.048 0.00 0.00 575 0.00 6354 40.18 0.05 0.047 0.00 0.00 635 0.00 6184 40.15 0.05 0.047 0.00 0.00 695 0.00 6016 40.11 0.05 0.046 0.00 0.00 755 0.00 5850 40.08 0.05 0.046 0.00 0.00 815 0.00 5686 40.05 0.04 0.045 0.00 0.00 875 0.00 5524 40.02 0.04 0.044 0.00 0.00 935 0.00 5365 39.99 0.04 0.044 0.00 0.00 995 0.00 5207 39.96 0.04 0.043 0.00 0.00 1055 0.00 5052 39.93 0.04 0.043 0.00 0.00 1115 0.00 4898 39.90 0.04 0.042 0.00 0.00 1175 0.00 4747 39.87 0.04 0.041 0.00 0.00 1235 0.00 4598 39.84 0.04 0.041 0.00 0.00 1295 0.00 4451 39.81 0.04 0.040 0.00 0.00 1355 0.00 4307 39.78 0.04 0.040 0.00 0.00 1415 0.00 4164 39.76 0.04 0.039 0.00 0.00 1475 0.00 4024 39.73 0.04 0.038 0.00 0.00 1535 0.00 3886 39.70 0.04 0.038 0.00 0.00 1595 0.00 3750 39.67 0.04 0.037 0.00 0.00 1655 0.00 3616 39.65 0.04 0.037 0.00 0.00 1715 0.00 3485 39.62 0.04 0.036 0.00 0.00 1775 0.00 3355 39.59 0.04 0.035 0.00 0.00 iS (Id G'OG'CG 1.0 CIO ! .•_ G GC• 1 J n GV' G 039 000 G r'v 4d42 G CU roc- a_I },r. r'nF n038 Cl CC' 0 Ur 0^,n d c"c GGu c.=1 3a'9! G'GdU C''CG G_CG dS32 G'Or loco 3c"rah n CH, r nr4 r'r,n C GO 1Jv2 G'GG -989 3c'80 G'GQ G'GcS 0'00 OCC j G2e G rG aG�� _' __ I)'nj r'(.v? 1'dr n cn 7.JN G C. CB G G,44 ID,GU GO r'g:r r_,'(;r- __._ 0OG 2920 �0 VC O'iic G'Gr� 0'OG G'GG cn) ru_'r; 10'44 0'02 G'rIt_, rro:r nrlr GC 19 G 1 = (- 01-1 c^'34 Qff _. rrna 0:_ 382 iJ CC-,e"9' ^ v0 S9 U'U2 G i;V3 G 00 __ Q'r;r�j •i�_c} zn'a�. U2 :'U�o r�'OU Gc'G G. 02o G co :c �3U U'GU ::J88 ?G 33 U rQ n'r_n rrnn G UU _ Se d"u'32 0'02 0'Oe0 0,00 C00 5d2 U UU ci ;'n2 O'C'cr ?r_, r_. rn 1-0 .0 CC, :G'39 0'G2 G'02 000 COG 700 U'rr ..c4 �-o 3o r 02 C. U-d r'^'^_• 0 Or' c0''0 G' _ 0'C'2: 0, GG 00.0 dP.c r''00 12a9 dri "I U U2 n ;r4 _ynn rl'rr J:C G GG V Gte 0,00 J 00 U 00 •1�Q 0C. _'. _a� d!1'dj ij'(!V ij'r:�`_; i?'r(1 r'rj ^r 'G J' ev Guc .':.ON dOtL Oc_ G^_'J .:C'U U�1 90 `o It 15 32 0 U25 r'•G U 3'r _7Q :i'y'".� C:^1� �n'S_; WiU� iCi`i ICfi �ti ti:� �CE�I [C(.2� fc-P! i-. v i5ii'r 1' i'r11-1 •JIV; 4 Flvr� E 41V`�i V^ rJ:'`i1 (� j1�il� "5!•_I Atf:V IV ;u pL 1 1 2 3 4 5 6 7 8 TIME INFLOW STORAGE STAGE OUTFLOW ORIFICE WEIR RISER/ [min] [cfs] [cu ft] [ft] Ids] [cfs] [ofs] BARREL 1835 0.00 3228 39.57 0.03 0.035 0.00 0.00 1895 0.00 3103 39.54 0.03 0.034 0.00 0.00 1955 0.00 2981 39.52 0.03 0.033 0.00 0.00 2015 0.00 2861 39.49 0.03 0.033 0.00 0.00 2075 0.00 2743 39.47 0.03 0.032 0.00 0.00 2135 0.00 2627 39.44 0.03 0.031 0.00 0.00 2195 0.00 2514 39.42 0.03 0.031 0.00 0.00 2255 0.00 2403 39.39 0.03 0.030 0.00 0.00 2315 0.00 2294 39.37 0.03 0.030 0.00 0.00 2375 0.00 2188 39.35 0.03 0.029 0.00 0.00 2435 0.00 2084 39.32 0.03 0.028 0.00 0.00 2495 0.00 1982 39.30 0.03 0.028 0.00 0.00 2555 0.00 1883 39.28 0.03 0.027 0.00 0.00 2815 0.00 1707 39.26 0.03 0.026 0.00 0.00 2675 0.00 1693 39.24 0.03 0.025 0.00 0.00 2735 0.00 1601 39.22 0.02 0.025 0.00 0.00 2795 0.00 1512 39.20 0.02 0.024 0.00 0.00 2855 0.00 1425 39.18 0.02 0.023 0.00 0.00 2915 0.00 1341 39.16 0.02 0.023 0.00 0.00 2975 0.00 1259 39.14 0.02 0.022 0.00 0.00 3335 0.00 785 39.02 0.02 0.017 0.00 0.00 3695 0.00 416 38.93 0.01 0.011 0.00 0.00 4055 0.00 169 38.86 0.00 0.004 0.00 0.00 4415 0.00 82 38.83 0.00 0.002 0.00 0.00 4775 0.00 48 38.82 0.00 0.001 0.00 0.00 5135 0.00 31 38.81 0.00 0.000 0.00 0.00 5495 0.00 21 38.81 0.00 0.000 0.00 0.00 5855 0.00 15 38.81 0.00 0.000 0.00 0.00 6215 0.00 11 38.81 0.00 0.000 0.00 0.00 6575 0.00 9 38.80 0.00 0.000 0.00 0.00 6935 0.00 7 38.80 0.00 0.000 0.00 0.00 7295 0.00 6 38.80 0.00 0.000 0.00 0.00 7655 0.00 5 38.80 0.00 0.000 0.00 0.00 G 000 L: 0G CK-1 ,,-n. .. _.. g�d`c 0'G0 Jd 39'91 000 O'rr;'G 0G0 ^,0 ?g 2 n„r_. 2 g'H, r'rr r'rr;::_ r_i+_r s2 0 co "s! 9J 0'00 G G00 0'0G G'Oii r ".c 38 O: 0 _ _01 i _ t:'_u J G GO i @a 29 %Q 0rG0 O G0e ,i GQ 0`:,G 3c82 C,'i,r t1iP ?p'v3 ^'OJ r'O;1 n' :: Gni .ici2 :)'GG .S22 _c Jc U 0 3 O'CSS O' 0 0'00 -'a2 ..'-r lati ?,_'ir ,in G_82 G GG i2i5 _ G U V G G c G'GQ (YOn O 0 S e O'GO G'GG O'r0 inn Oro I'C_ _ 32 0'GO IG9c 3825 0'0 0'0:39 0"10 0'U0 Jf- .... _.. ') CC Je�''3 JG' ]7 G 02 'J VJG 00 S0_2 C'GG Sit % 3J'd! Ml)O; 0, Ca 00 % i 0 r i : r rV J^C4 ",a -10 o 0_ rL� ^'r,_i ('i on J 902 -G cc 31 G3 ..O Cti G 0.i V U 010 0 00 d9?2 ?'rr 9 3c _._ n'm r,'n_a ^r ri'rn twui t� i iCr!ut NO t 4=1 tct� icEzi eIV- 1.lv� wY :in�r.�.�.z L1 `: V5 _a t n�`:}_nrc +'v_ i i..nr 61Y`�:_ r'S.'. r:5 tJf !_�!V.Y ni •n_in- li4JiL"aL t. rf! t':,L�•. -•-r}_.: iJV4L 14.0 12.0 10.0 4.0 2.0 0.0 O Ip N 0 � t7 V CHAINSAW ROUTING TIMEMuNj -INFLOW -i -OUTFLOW iNAITi CIA lMA '.;IIAL4 3 OSt OW O.0 0.S 0.0 State of North Carolina Department of Environment, Health, and Natural Resources Wilmington Regional Office James B. Hunt, Jr. DIVISION OF ENVIRONMENTAL MANAGEMENT Jonathan B. Howes Governor WATER QUALITY SECTION Secretary November 22, 1995 Mr. Jim Honeycutt, P.E. Honeycutt Engineering Post Office Box 15036 Wilmington, North Carolina 28409 Subject: ADDITIONAL INFORMATION Stormwater Project No. SW8 950711 Modification Cardinal Trade Center New Hanover County Dear Mr. Honeycutt: The Wilmington Regional Office received a modification to the Stormwater Management Permit Application for Cardinal Trade Center on November 8, 1995. A preliminary review of that information has determined that the application is not complete. The following information is needed to continue the stormwater review: 1. Completed permit application form, enclosed. 2. The SA/DA ratio you have used did not change from the last submittal. The percent impervious has increased, therefore, the required surface area will increase. T h e previously permitted surface area of 3,805 square feet is insufficient to support the impervious area increase. 3. What is the surface area at the revised storage elevation of 40.48? 127 Cardinal Drive Extension, Wilmington, N.C. 28405-3845 • Telephone 910-395-3900 • Fax 910-350-2004 An Equal Opportunity Affimtetive Action Employer Mr. Honeycutt November 22, 1995 Stormwater Project No. SW8 950711 Modification Please note that this request for additional information is in response to a preliminary review. The requested information should be received by this Office prior to December 22, 1995, or the application will be returned as incomplete. If you have any questions concerning this matter please feel free to call me at (910) 395-3900. Sincerely, Ms. Linda Lewis Environmental Engineer DA/arl: S:\WQS\STORMWAT\ADDINFO\950711.NOV cc: Linda Lewis Central Files 2