HomeMy WebLinkAbout20071856 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
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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
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