The URL can be used to link to this page

Home My WebLink About20071856 Ver 1_More Info Received_20071120UP 0) - I ed S3 (0 KELLER ENVIRONMENTAL ENVIRONMENTAL CONSULTANTS 7921 Haymarket Lane, Raleigh, NC (919)844-7437 Fax (919)8447438 U[q(':4Qsflwg Aihli n _ _ LETTER OF TRANSMITTAL DElyR - WAI;FR QUALITY DATE: November 20, 2007 A1R4ANOSTth2a ATERBRWCN TO: NC Division of Water Quality DWQ Express Project # 07-1856 ATTENTION: DWQ EXPRESS TEAM RE: Arch Aluminum WE ARE SENDING YOU THE FOLLOWING: ? Pre-construction Notification (PCN) ® Plans ® Documents ? Other THESE ARE TRANSMITTED AS CHECKED BELOW: E For approval ® As requested ? Please reply ? See below ® Maps ® For review & comment ® For your files ? Specifications ? Regular Mail ? Fed-Ex ® Delivered by KE ? Picked Up COPIES DATE DESCRIPTION 2 11-19-07 Arch Aluminum Resubmittal letter _ 2 11-13-07 DWQ Request for More Information letter 2 11-08-07 11 x 17-inch Large Overview Sheet 2 9-28-07 Site Staking Plan Sheet (C2) 2 9-28-07 Site Grading Plan Sheet (C3) 2 11-19-07 Pond Pack Master Summary 2 10-23-07 Velocity Worksheet 2 GIS Aerial Overview 1 CD Remarks: THANK YOU! Recd BN:°v Signed _ KE KELLER ENVIRONMENTAL ENVIRONMENTAL CONSULTANTS November 19, 2007 Cyndi Karoly NC Division of Water Quality 401 Wetlands WQ Certification Unit 1650 Mail Service Center Raleigh, North Carolina 27699-1650 Re: Arch Aluminum Keller Environmental Job No. 0767 DWQ Express Project # 07-1856 Franklin County, North Carolina Dear Ms. Karoly: We are submitting the additional information requested from written correspondence on November 13, 2007. We are requesting for NC Division of Water Quality (NCDWQ) written approval for the stormwater plan affiliated with the proposed project. This will assist in compliance with Water Quality Certification (WQC) 3631 and it's accompanying Nationwide Permit (NWP) 29. We have addressed your included written comments in the following paragraphs. 1. Site Plans a. Please provide one(1) site plan and one(1) copy at a scale of 1":50' or larger showing the Arch Aluminum project site with proposed structures in relation to Youngsville Industrial Park project site and footprints of existing structures. Please refer to the "large overview" 11 x 17-inch sheet for the project's location in relation to the industrial park and the UT to Brandy Creek. b. Please show on the plans the boundaries of all recorded drainage easements having drainage access easement to public right of way (ROW), and detailed information of all existing drainage structures/features and topographic contours in the area between the outlet structures and the receiving stream. Please refer to the site grading (C3) and staking (C2) plans. Both plan sheets illustrate the drainage easements. Please refer to the "large overview" 11 x 17-inch sheet for the topographic contours and features between the outlet structure and the UT to Brandy Creek. 401 Stormwater Re-Submittal Arch Aluminum November 19, 2007 Page 2 of 4 2. Wet Detention Pond a. Per the Stormwater Management plan (SMP) Requirements for applicants other than the North Carolina Department of Transportation, stormwater BMP's must be designed, at a minimum, to remove 85% Total Suspended Solids(TSS). Additionally, all projects requiring stormwater management and located in NSW watersheds in the Tar-Pamlico River Basin must also remove a minimum of 30% total nitrogen (TN) and 30% total phosphorus (TP). Please note that a stand-alone Wet Detention Pond does not meet the 30% TN and 30% treatment levels required for a site draining to NSW Watershed. Therefore the wet detention pond must either be combined with another BMP, or replaced with an appropriate BMP in order to meet the nutrient removal requirement. Please refer to the following site for more information: http://h2o.enr.state.nc.us/ncwetiands/documents/SMPReguirem entsforApplicantsotherthanNCDOT. pdf. The proposed wet detention pond (WDP) has been designed to surpass the required 85% TSS by removing 90% of TSS. Removal of 40% of the Phosphorous will also be accomplished by the WDP. We are also requesting classification of this WDP as a pond/wetland system per Section 9.2 of the July 2007 DWQ BMP Manual. Approximately 49% (547 yd3 / 1,114 yd3) of the WDP is allocated to the wetland area. We recommend that the linearly interpolated TN removal rate should be 32%. Facilitation of this TN removal should be achieved by the 847 plants proposed along the water's edge. Also, further TN, TP, & TSS removal should occur along the approximately 1,800 feet separating the outlet from the UT to Brandy Creek. Considering these factors, we request that proposed WDP be allowed to function as previously designed. b. All BMPs must be designed in accordance with the most recent version of the NC Division of Water Quality Stormwater Best Management Practices Manual. The proposed BMP's were designed in accordance with the July 2007 DWQ BMP Manual. C. If more than one stormwater BMP is proposed, please include a separate BMP Supplement Form for each proposed BMP. The BMP supplement Forms are available at http://h2o.enr.state.nc.us/su/bmp forms.htm. Please include 401 Stormwater Re-Submittal Arch Aluminum November 19, 2007 Page 3 of 4 both the Design Summary and the Required Items Checklist along with all the required items listed therein. d. Please include a signed and notarized Inspection and Maintenance Agreement Form for each proposed BMP. We request that the proposed WDP be allowed to function as a single stormwater BMP. Please refer to the previously submitted November 5, 2007 Inspection and Maintenance Agreement form for the proposed WDP. 3. Diffuse Flow a. Additionally, per Condition 3 of the approved 401 Certification, please show how the stormwater from the BMP shall be directed as diffuse flow at non-erosive velocities through protected riparian buffers, if any, and will not re-concentrate prior to discharging into the receiving stream (unnamed tributary to Brandy Creek). In particular, please include the exit velocities at the outlet structures with supporting calculations. The riparian buffers associated with the UT to Brandy Creek are approximately 1,800 linear feet away from the WDP outlet. Please refer to the attached Pond Pack Master Summary and Velocity Calculation Sheets. Discharge and Velocities associated with the 1 and 10-year storms should be 5.32 cfs and 15.66 cfs and 3 fs and 8.86 fs, respectively. If you should have questions or require additional clarification please feel free to contact me at 844-7437 (office), 749-8259 (cell) or email: iay@kellerenvironmental.com. Sincerely, Keller Environmental, LLC Z "e" ?Xx Jay Keller Principal Cc: Brian Speight PE Bill Bland 401 Stormwater Re-Submittal Arch Aluminum November 19, 2007 Page 4 of 4 Attachments: • November 13, 2007 DWQ Request for More Information letter • 11 x 17-inch Large Overview Sheet • Site Staking Plan Sheets (C2) • Site Grading Plan Sheet (C3) • Pond Pack Master Summary • Velocity Worksheet • GIS Aerial Overview CJ (7) ?rl t7- CD COD C] sn es - o CD r l- o n o o °o_ v u n m v R e°' b 4 N? - - .mss +? N . ?_ +-e ?-v- ?. ??-^ p -s R- C vii (?D ro TS O x.53 'z -. w W <D CD CD x CD ¢. CD ?- ' '?. z° O ° '-? • CD "TJ ops CD ? O CAD P? O W ,F?..N. pv?' ® rn 'pe s?.r?. 57, CD C-D ?D -? CD- ' CD J p .ate[ (?j !S _;O ? CD eu CD R gy cn ..; n ?. N ?°? ('? O `c3 P-r O N .--r L CD <D CD eb CD CD -C:3 =1 CD ura? CD S-? L7- CD t2 <D ucl m TJ C) CD cD CD CD o n via ? o < CD CD CD en o=-°`?x v' w ?O c ¢ '-C.. p - o y ^ e o n o a' w o o C? v? m v4 a_ Q- P n ` -, m CD CAD - CD O CAD !'C) o (D - O o w w w< c, v m ca sz, n •-h - r„ w u°, w.. a° ?- - W CD _ .-t p, ?. --3 CD N =7 CD CD CD C>,- cp _ a y n CD o CD o ¢ cfc? b cs CD p c ® o 2 v H o ?y CD a vc cn rn Zs v eD E-i QrCi cs CD ca- CD CD CD - CD n - O - O yv CD °e3' cF C1. c'a YD < w. ??- n r+ O QED R '.CD? -SM CD CD CD cu -E=S CD c:> CD C:) ta- C. CD Ej lz? w .-h-. CD -. "°e i.n CD rsn CAD O_ ?-t CD rD 1= CD ° w o _ o i<D ° - _ _ can w CD CD a o o o w CD oc? <v ?. a oro v o o cD N n' n alp CD m o -- m w 9 m 5 - g m a.. n ? ..o co ?, c„ ,? ? ev ? o e o o ? a CrJ ? <° -`° 1v? v - W'°p ? 4?D ? .? b.? O C? p.. b '? ti- '•tl ? I? O? (;Q ?, ? ?' ?..-? .CAD ? ? ;? ? -".3" ? ?. ? - ?/ y. cn ° O 'cD CD ?_ ti `..^t tD ..i ,-, cC O CD .y ev w' o w o o w CD ?". ?. w O w O T= O O cn p-F S3 R s m C O? O N '? O4 OQ p _ -s 44 CD `,-r' D ti r . ?a .-+ "% •? r+- •~.3 O tsi CD - ® qp D • "?' -e- 'L? - . N rOi- C O cD ^--: cD a7 can m ?. y O ?' c"D O .w.i Q.. `? w b v' F3 ED CD =z xD cD cD "? O • CD Q.- N .--r O C ® - P. rb EL <D '? to -w .'3 ,? O o--e cD cD `? r.-ti C r+ ® ?' O O ` , Pn rt O C w 00 E Uq n vOi O [D .C-' -c:3 "? O? (D O C? `° - ® [--j - 0,::4 CD O cD CD CD D o CD . O: CD 'c7 CT ' v' w R- ' CY O O O .?• '?'-'Oy cD s_- cD CD '??° ._, C w°: ?' ''G _` C?• ?, CD = N rn w ?zj `J C/] ,.a CD w UC ..0 O N - ?.. +O-s w m O OCR `C _ •. N R-, '°fl f m UQ tC _ --j W - = CD cD o cc °o =7- xD CD CD o- oo w cn p o° f_w. n °? cr ° O ? N ¢ ?y??y-- w r'3 _ O • ® Imo- ?. ? ?1- ?: = ? ? '..S- ?° a 'CS '-"?' CD w O [A CD v C - "C3 C_D ?1. O C]. p ° '-d `a N O.. a. O Cv ® !1. eo ..? r0-. .PD.q y?y /?4?yJ°` C? 'y p a? °`Y ^F] eY Vl P--1 w O V ?] _ '?' _ ?T n w F3 t=t m n cD CD ° o uD Uo c w er y_ cD- ra o .t ?, Nom! .?+ CfQ v? -<C jai •-e x y-? -..CD ®_ - - - T,_• Q ,°?, v? ° N c.o. "'G `?S ?• CD G ?O < < O? p can , cD ID It • ?`--r.. «.s- O UQ O i' C7 - cV'v :Q.. 4 CD z . X.. ??.. ,prn G o h.: -,m U co CD 0 --? y?'?la qT 4 ". v ' ' • f •:?. yr, vL ?ti.. LL P. YT rT SX ow Type.... Master Network Summary Page 2.01 Name.... Watershed File.... C:\ SITE-CIVIL\ Active Projects\2007\07-024 (Arch Aluminum and Glass)\Pond Pack\A MASTER DESIGN STORM SUMMARY Network Storm Collection: Franklin County Total Depth Return Event in Dev 1 3.0000 Dev 10 4.9800 Dev 25 5.9400 Dev100 7.4200 Rainfall Type --------------- Synthetic Curve Synthetic Curve Synthetic Curve Synthetic Curve RNF ID TypeII 24hr TypeII 24hr TypeII 24hr TypeII 24hr MASTER NETWORK SUMMARY SCS Unit Hydrograph Method (*Node=Outfall; +Node=Diversion;) (Trun= HYG Truncation: Blank=None; L=Left; R=Rt; LR=Left&Rt) Node ID *OUT 1-POST *OUT 1-POST *OUT 1-POST *OUT 1-POST *OUT 1-PRE *OUT 1-PRE *OUT 1-PRE *OUT 1-PRE POND 1 POND 1 POND 1 POND 1 Return --- Type ---- Event ------ JCT 1 JCT 10 JCT 25 JCT 100 JCT 1 JCT 10 JCT 25 JCT 100 IN POND 1 IN POND 10 IN POND 25 IN POND 100 HYG Vol cu.yd. Trun 1346.65 R 3600.93 R 4764.52 R 6606.87 R 1152.67 3044.92 4085.69 5780.78 1557.13 3125.88 3912.22 5140.34 Qpeak min 722.50 716.00 715.50 715.50 716.00 715.50 715.50 715.50 715.50 715.00 715.00 715.00 Max Qpeak Max WSEL Pond Storage cfs ft cu.yd. ------- -------- ------------ 8.01 27.99 32.93 40.73 12.73 35.57 47.88 67.56 18.15 35.48 43.91 56.83 SIN: FEYXYWJ8TX2A Bentley PondPack (10.00.023.00) 4:39 PM CPS Engineers PA 11/19/2007 Type.... Master Network Summary Page 2.01 Name.... Watershed File.... C:\ SITE-CIVIL\ Active Projects\2007\07-024 (Arch Aluminum and Glass)\Pond Pack\A MASTER NETWORK SUMMARY SCS Unit Hydrograph Method (*Node=Outfall; +Node=Diversion;) (Trun= HYG Truncation: Blank=None; L=Left; R=Rt; LR=Left&Rt) Max Return HYG Vol Qpeak Qpeak Max WSEL Pond Stor age Node ID -------- -- ------ Type ---- Event ------ cu. ------ yd. ---- Trun -- mi ----- n ---- cfs ----- --- ft ----- --- cu.yd. --------- --- POND 1 OUT POND 1 928 .30 R 725. 50 5. 32 429. 18 755. 09 POND 1 OUT POND 10 2495 .69 R 723. 50 15. 66 429. 85 1262. 91 POND 1 OUT POND 25 3281 .48 R 724. 00 16. 38 430. 23 1562. 98 POND 1 OUT POND 100 4508 .50 R 725. 00 17. 35 430. 77 2005. 43 SUBAREA 1- PRE AREA 1 1152 .67 716. 00 12. 73 SUBAREA 1- PRE AREA 10 3044 .92 715. 50 35. 57 SUBAREA 1- PRE AREA 25 4085 .69 715. 50 47. 88 SUBAREA 1- PRE AREA 100 5780 .78 715. 50 67. 56 SUBAREA 1A -POST AREA 1 418 .42 716. 00 4. 62 SUBAREA 1A -POST AREA 10 1105 .31 715. 50 12. 91 SUBAREA 1A -POST AREA 25 1483 .10 715. 50 17. 38 SUBAREA 1A -POST AREA 100 2098 .42 715. 50 24. 52 SUBAREA 1B -POST AREA 1 1557 .13 715. 50 18. 15 SUBAREA 1B -POST AREA 10 3125 .88 715. 00 35. 48 SUBAREA 1B -POST AREA 25 3912 .22 715. 00 43. 91 SUBAREA 1B -POST AREA 100 5140 .34 715. 00 56. 83 SIN: FEYXYWJ8TX2A Bentley PondPack (10.00.023.00) 4:39 PM CPS Engineers PA 11/19/2007 Pipe Diameter 18.00 in Equation - Q=VA where: Q = Discharge (cfs) A = Cross-sectional area of Pipe (sf) V= Velocity (fs) From Pond Pack Print Report: Q1 = 5.32 cfs Q10 = 15.66 cfs Solve for A: Pi*R2 R = 0.75 ft A = 1.77 sf Solve for V: V1 = 3 fs V10 = 8.86 fs v 1 1 I I v ~ ~ i 1 1 1 1~(( ( I _ / ` ~ \ / \ V ~ ~ ~ V A ~ ~ \ iJ \ \ V~~ ~ A A \ Zoe A ~ ~A~~ ~ ~ \ \ \ \ 0000e /Z ~ V~ I \ ~ ~ ~ ~ ~ ~ ~ A \ \ \ ~ ~ ~ \ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ \ ~ ~ ~ ~ ~ ~ ~A~~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ V FF i ~ ~ ~ ~ ~ A ~ i V I ~ ~ i ~ A - ~ ~ ~ ~ ~ ~ ~ ~ -79 \v~ I I ( _ - - L N _ vv 1 / f / A \ V 11 I I j / j i A ~V \ A I 1 I I - ~ ~ ~ ~ ~ V ~ ~ ~ ~ ~ro \ ~ ~ ~ ~ ~ ~ ~ ~ \ ~ ~ ~ ~ A~ I l I St \ V 1\ AA\ \ ~ ~ ~ ~ ~ l-- \ ~ ~ I ~ \ ~ ~ ~ - ~ ~ ~ ~ ~ ll~l I ~ ~ ~ / A \ i 11 ~1 v 1 1 1 A / / 1 i~ ~d' i ~ i ~ ~ ~ I i i J i ~ i ~ ~ / / e / 1 ~ i v o 0 o z DATE COMMENTS m s m m m z m m ARCH ALUMINUM AND GLASSc ; { i m cn C o g D Oz A YOUNGSVILLE, NORTH CAROLINA D N rn JeD m 0 O F N N' G < D z ~a~H u~ 000 M ~2 v ~ z N m N O F+ ? J