20090411 Ver 1_More Info Received_20090813

MULKEY
ENGINEERS & CONSULTANTS
PO Box 331 27
RALEIGH, NC 27636
PHONE: [phone]
FAx: 919-B51-191B
LETTER OF TRANSMITTAL
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To: NCDENR-DWQ Date: August 13, 2009
Cyndi Karoly
Attn: Annette Lucas
401 Permitting Unit
2321 Crabtree Blvd., Suite 250
Raleigh, NC 27604
** HAND DELIVER **
Re: DWQ Project # 09-0411
DHHS State Lab for Public Health & Med
Examiner's Office
Job No.: 2007096.00
I am sending you the following item(s):
COPIES DATE NO. DESCRIPTION
5 Response to Request for more information
Calculations associated with Response to Request for
5
more information
Revised plan sheets (C1102, C1 102a, C1 102b, &
5
C1 102c)
These are transmitted as checked below:
? As requested ® For your use
® For approval ? For Signatures
? For review and comment ?
Remarks:
Please let me know if there are any questions or comments. You can contact me at 919) 858-1 11 or
[e-mail]. Thank you for your time and assistance. i
Copy to: Signed:
Warren M. Su
Project Engineer
MULKEY i'
ENGINEERS & CONSULTANTS
August 13, 2009
North Carolina Department of Environment & Natural Resources
Division of Water Quality
Cyndi Karoly, Regional Office Supervisor
401 Oversite/Express Review Permitting Unit
2321 Crabtree Blvd
Raleigh, North Carolina 27604
Subject: Response to July 22, 2009 Request for More Information
DWQ Project # 09-0411
State Laboratory For Public Health and Medical Examiner's Office
Response to Request for More Information
Mrs. Karoly:
'?NpST ??? 4 ?S
C,y
Mulkey Engineers and Consultants is serving DHHS as the site/civil for the above reference project.
Below we have provided the formal response to the request for more information by your office.
Please find these responses along with the associated and included documentation to verify the
responses.
1. As listed in the Required Items Checklist, please provide plan details for the beretention cells
at a scale of 1"=20'.
Response: Plan Sheet C1 102b & c have been provided to show both plan and profile of each
bioretention cell at the appropriate scales.
2. Please specify provide a large diagram of the bioretention cross-section.
Response: Plan Sheet C1102 is the construction plan sheet and C1102c has the large
diagram of the bioretention cross section in detail while C1 120b & c gives each bioretention
in plan and profile at a large scale.
3. Please re-design the outlet of the proposed Wet Detention Pond to protect against erosion
in the riprapian buffer. The DWQ suggest extending the discharge pipe to discharge
stormwater to a flatter area. In addition, please provide a dissipater pad with supporting
calculations to show that the flow will be maintained at a non-erosive velocity (2 fps or less)
during the peak flow from the 10-year storm.
Response: Please refer to plan sheet C1 102a where the outlet pipe from the wet pond was
extended to the flat area to the east of the pond and prior to entering the buffer. The flow
from the pipe in the 10 year storm is only 0.539 cfs since the pond holds the entire storm
without entering the overflow riser except through the (2) 3" slow draw-down orifices which
will product less than a 1 foot per section velocity in the 10 year storm. A dissipater design
calculations have been provided under this cover and were designed from the NCDENR
Erosion Control manual. The pad sizing is shown on the plan sheets provided.
MULKEY INC. 6750 TRYON ROAD CARY. NO 27511 PC Box 331 27 RALEIGH, NO 27536 PH: 919-851-1912 FAX: [phone] WWW.MULKEYINC.CDM
4. Please re-design the outlet devices from the bioretention cells to ensure that the water depth
will not exceed 12 inches. This could be achieved through the use of a level concrete berm
or a drop inlet set at the appropriate elevation.
Response: Concrete outlet berms have been shown on C1102 for each bioretention and has
been set at the 12 inch elevation to insure all bioretentions achieve the correct volume and
depths. Plan sheets C1102b & c show the plan and profiles for each bioretention which
includes the concrete outlet berms.
Please let me know if you have any further questions, comments, or concerns. Thanks.
Rivl?
Warren M. Sugg, PE, LEED AP
Project Engineer
Mulkey Engineers & Consultants
-?*-M U LK EY CALCULATION SHEET PAGE OF.
ENGINEERS & CONSULTANTS
CLIENTr?, &'4 5 SUBJECT Prepared By rw? Dateallilaq __
PROJECT No. 2 _10%. op {?? ? Reviewed By ?? Date SCI 01
Appendices
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GF) FVN ? Po?J? 5 Discharge (ft3/sec)
OVFTAf CINA'VrGOV(.0-53RcFS)
Curves may not be extrapolated.
Figure 8.06a Design of outlet protection protection from a round pipe flowing full, minimum tailwater condition (Tw < 0.5 diameter).
Rev. 12/93 8.06.3
Pond Report
Hydraflow Hydrographs Extension for AutoCADO Civil 3D® 2008 by Autodesk, Inc. v6.052 Wednesday, Jun 10, 2009
Pond No. 1 - Wet Pond 4
Pond Data
Contours - User-defined contour areas. Conic method used for volume calculation. Begining Elevation = 402.00 ft
Stage / Storage Table
Stage (ft) Elevation (ft) Contour area (sqft) Inc r. Storage (cult) Total storage (cuft)
0.00 402.00 73 0 0
1.00 403.00 880 402 402
2.00 404.00 1,578 1,212 1,614
3.00 405.00 2,364 1,958 3,572
4.00 406.00 4,904 3,557 7,129
5.00 407.00 6,555 5,709 12,838
5.75 407.75 7,429 5,240 18,078
6.00 408.00 7,728 1,894 19,972
7.00 409.00 8,959 8,335 28,307
8.00 410.00 10,245 9,594 37,901
Culvert I Orifice Structures Weir Structures
[A] [B] [C] [PrtRsr] [A] [B] [C] [D]
Rise (in) = 24.00 3.00 0.00 0.00 Crest Len (ft) = 12.00 0.00 0.00 0.00
Span (in) = 24.00 3.00 0.00 0.00 Crest El. (ft) = 407.75 0.00 0.00 0.00
No. Barrels = 1 2 0 0 Weir Coeff. = 3.33 3.33 3.33 3.33
Invert El. (ft) = 402.00 406.00 0.00 0.00 Weir Type = Riser -- --- ---
Length (ft) = 76.00 0.00 0.00 0.00 Multi-Stage = Yes No No No
Slope (%) = 1.00 0.00 0.00 n/a
N-Value = .013 .013 .013 n/a
Orifice Coeff. = 0.60 0.60 0.60 0.60 Exfil.(in/hr) = 0.000 (by Contour)
Multi-Stage = n/a Yes No No TW Elev. (ft) = 0.00
Note: ulvert/Orifice outflows are analyzed under inlet (ic) and outlet (oc) control. Weir risers checked for orifice conditions (ic) and submergence (s).
Stage / Storage / Discharge Table
Stage Storage Elevation Clv A Clv B Clv C PrtRsr Wr A Wr B Wr C Wr D Exfil User Total
ft cuft ft cfs cfs cfs cfs cfs cfs cfs cfs cfs cfs cfs
0.00 0 402.00 0.00 0.00 --- --- 0.00 --- --- --- --- --- 0.000
1.00 402 403.00 0.00 0.00 -- --- 0.00 --- --- --- --- -- 0.000
2.00 1,614 404.00 0.00 0.00 -- --- 0.00 --- --- --- --- --- 0.000
3.00 3,572 405.00 0.00 0.00 --- --- 0.00 --- --- --- --- --- 0.000
4.00 7,129 406.00 0.00 0.00 --- --- 0.00 --- --- --- --- --- 0.000
5.00 12,838 407.00 0.44 is 0.44 is --- --- 0.00 --- --- --- --- - 0.442
-"5.75 18,078 407.75 0.60 is 0.60 is --- --- 0.00 --- --- --- -- --- 0.603
6.00 19,972 408.00 5.64 is 0.65 is --- -- 5.00 --- --- --- --- --- 5.642
7.00 28,307 409.00 36.17 is 0.25 is --- --- 35.92s --- --- --- --- --- 36.17
8.00 37,901 410.00 39.84 is 0.12 is --- --- 39.70s --- --- --- --- --- 39.82
Hyd rog ra p h Return Pe ri odHj3FI fowC'FTyloographs Extension for AutoCAD® Civil 3D® 2008 by Autodesk, Inc. v6.052
Hyd. Hydrograph Inflow Peak Outflow (cfs) Hydrograph

No. type Hyd(s) description
(origin) 1-Yr 2-Yr 3-Yr 5-Yr 10-Yr 25-Yr 50-Yr 100-Yr
1 Rational - -- 7.702 9.286 ------- ------ 12.03 ------- ------- 16.50 Wet Pond 4 Pre Development
2 Rational ------ 19.73 23.57 ------- ------- 29.55 ----- ----- 39.77 Wet Pond 4 Post Development
3 Reservoir 2 0.444 0.483 ------- ------- 0.539 ------- ------- 1.700 Wet Pond 4 Routed
Proj. file: Wet Pond 4.9pw Wednesday, Jun 10, 2009
Hyd rog ra p h Summary Re PHydPafiow Hydrographs Extension for AutoCAD® Civil 3D® 2008 by Autodesk, Inc. v6.052
Hyd.
No. Hydrograph
type
(origin) Peak
flow
(cfs) Time
interval
(min) Time to
peak
(min) Hyd.
volume
(cuft) Inflow
hyd(s) Maximum
elevation
(ft) Total
strge used
(cuft) Hydrograph
description
1 Rational 12.03 1 10 7,217 ------ --- - ------ Wet Pond 4 Pre Development
2 Rational 29.55 1 5 8,865 ----- --- - -- -- Wet Pond 4 Post Development
3 Reservoir 0.539 1 10 8,851 2 =407.43 15,803 Wet Pond 4 Routed
Wet Pond 4.gpw Return Peri d: 10 Year Wednesday, Jun 10, 2009
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~ ' , 0 _ ~ ~ t ~ ~ - 0 ' ~/i' , , I 1 ~ c i ° ' ~ .~.,7 DIET PONDfY I' ~i ~ S~~ RC 114 7h OWa COMMENTS 0$/13/09
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_ ~ - ' ' D ey J. Powless
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STORM
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File Name DHHS - MAIN.dwg
C 102 1 "=50'-0'° 1 F=9 0 sheet
c1102
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TOP OF POND 10' SHELF AROUND ELEVAl10N=410.0 PERIMETER OF E N 37: 10' SHELF AROUND ~ ° - m
TOP OF BERM MAIN POOL TOP OF WEIR OUTLET PERIMETER OF TOP OF POND ~ 2 ~ ELEVAltON=410.0 a -o w STRUCTURE. EL =407.75 MAIN POOL ° ~ ~
ELEVATION = 407.0 407.0 PERMANENT POOL ELEVATION = 406.0 PERMANENT POOL ELEVATION = 40&.0 3:1 SLOPE s o p 3:1 SLOPE ~ ~ °
EL. 407.0 BOTTOM OF POND ELEVATION = 403.0 3:1 SLOPE EL. 406.5 ~ ~ ~ EL. 405.5 3:1 SLOPE ~ ~
2:1 SLOPE EL. 406.5 2:1 SLOPE FOREBAY 10:1 SLOPE BOTTOM OF POND ELEVA710N = 402.0 10:1 SLOPE ~ ~ 3:1 SLOPE ° ° en ° U m . 'v ~
EL 405,5 MAIN POOL a°i m = U0 ~ ?cn
3:1 SLOPE Issued Dote
NOTES: 24° RCP OUTLET 100-LF ®?.02~ FES Cd SUBMRTAL 12/14/09
1) THE POND SHALL BE CLEANED OUT WHENEVER SEDIMENT ACCUMULATES INV=395.00 FINIAL CD SUBMITTAL 04f17/D9
TO A DEPTH OF 25% OF TOTAL DEPTH.
2) CONTRACTOR TO REMOVE ALL SEDIMENT FROM ENTIRE BASIN ONCE CHANGES PER 09~D5~A9
CONSTRUCTION IS COMPLETE. ~ iNET POND SECTIQ ~IE~V DIT COMMENTS CHANGES PER 08/13/09 DWO COMMENTS
3) VEGETATION SHALL BE PLANTED ALONG THE ENTIRE PERIMETER OF THE PONO PER THE LANDSCAPE DRAWINGS.
UTILITY INSTALLATIONS AND OTHER PUBLIC FACILITIES, INCLUDING SIDEWALKS AND HANDICAP RAMPS ARE TO BE
CONSTRUCTED ON AI_L STREETS AS SPECIFIED BY CITY CODE.
THESE FACILITIES HAVE BEEN APPROVED BY THE CITY OF
RALEIGH AND SHALL BE SO INSTALLED UNLESS A CHANGE IS
AUTHORIZED BY WRITTEN APPROVAL. PUBLIC SANITARY
SEWER EASEMENTS ARE TO BE REGORGED PRIOR TO FINAL A ACCEPTANCE.
TRANSPORTATION SERVICES
PUBLIC UTILITIES: checked ~ W. S~gg
CONSERVATION ENGINEER Drawn 8y
J: PoWless
t LAIWV1NU: Drawiing WET POND
PLAN AND
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®NDH ALL CONSTRUCTION TO BE IN ACCORDANCE WITH ALL CITY OF RALEIGH DH NS - MAIN;dwg
STANDARDS AND SPECIFICATIONS AND NCDOT, IF APPLICABLE. sheet
C 1 '02a
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TOP OF BIORETENTION ELEVATION=423.0 CAPPED TOP OF 810RETEN110N ELEVATION=423.0 CONCRETE CD SUBM((fAL 12/14J08
CLEANOUT PIPE PONDED WATER ELEVATION = 422.0 OUTLET BERM ~ 422.0 -
3:1 SLOPE PLANTING ELEVATION = 421.0 FINAI CD SUBMII'CAL 04jt7j09 3:1 SLOPE
6" PERF. PUC UNDERDRAIN g 0.5% CHANGES PER 08/05/09 CIi'( COMMENTS
SCHEDULE 40 CHANGES P£R 08/13/09 IJWCI COMMENTS
BOTTOM OF BIORETENTION CELL = 415
INV=415.0 ~.6" PVC OUTLET
~IORETENTION AREA 1 SECTION VIEV~ 40-LF ®2.50% INV=414,0
UTILITY INSTALLATIONS AND OTHER PUBLIC FACILITIES,
INCLUDING SIDEWALKS AND HANDICAP RAMPS ARE TO BE
CONSTRUCTED ON ALL STREETS AS SPECIFIED BY CITY CODE.
THESE FACILITIES HAVE BEEN APPROVED BY THE CITY OF
RALEIGH AND SHALL BE SO INSTALLED UNLESS A CHANGE IS
TOP OF BIORETENTION CAPPED TOP OF BIORETENTI(k~! AUTHORIZED BY WRITTEN APPROVAL. PUBLIC SANITARY A SEWER EASEMENTS ARE TO BE RECORDED PRIOR TO FINAL A
Tl N=409.25 CLEANOUT PIPE _ ELEVA 0 ELEVATION 409.25 CONCRETE PONDED WATER ELEVATION =408.25 OUTLET BERM ~ 408.25 ACCEPTANCE.
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3: t SLOPE PLANTING ELEVATION - 407.5 3, i SLOPE 6" PERF. PVC TRANSPORTATION SERVICES
UNDERDRAIN ®0.5% SCHEDULE 40 ~ lNV=401.5 Project No. 2~Q~o~6
PUBLIC UTILITIES: chec~ea Dy W SU INV=401,0 99
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5 4 3 1 ~CA 102b 2 ~
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TOP OF BIORETENTION TOP OF BIORETEN110N CHANGES PER 08/13/09 pWQ COMMENTS
ELEVATION=407.0 CAPPED ELEVATION=406.50 CONCRETE PONDED WATER ELEVATION = 406.0 CLEANOUT PIPE OUTLET BERM ®406.0
J 3:1 SLOPE
3:1 SLOPE PLANTING ELEVATION =405.0
6" PERF. PVC UNDERDRAIN ~ 0.5%
SCHEDULE 40
BOTTOM OF BIORETENTION CELL =400.0 INV=400.4 6° PVC OUTLET INV=400.0 UTILITY INSTALLATIONS AND OTHER PUBLIC FACILITIES, ~iNV=aGa.o INCLUDING SIDEWALKS AND HANDICAP RAMPS ARE TO BE
40-LF ~ 1.00 CONSTRUCTED ON ALL STREETS AS SPECIFIED BY CITY CODE.
BIORETENTION AREA 3 SECTION VIEW THESE FACILITIES HAVE BEEN APPROVED BY THE CITY OF
RALEIGH AND SHALL BE SO INSTALLED UNLESS A CHANGE IS
AUTHORIZED BY WRITTEN APPROVAL PUBLIC SANITARY n
A SEWER EASEMENTS ARE TQ BE RECORDED PRIOR TOFINAL /-1 ACCEPTANCE.
TRANSPORTATION SERVICES
~`OJeCt 2406076 PUBLIC UTILITIES:
cne~ked av W. Su99
CONSERVATION ENGINEER ora~~ J. Powless
HLANNINU: Drawing
B10RETENTION
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ALL CONSTRUCTION TO BE IN ACCORDANCE WITH ALL CITY OF RALEIGH DH ele'HHS - MAIN.dwg DN
STANDARDS AND SPECIFICATIONS AND NCDOT, IF APPLICABLE. Sheet
C1 102c
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