20071538 Ver 1_More Info Received_20071114

Environmental Consultants, PA
Road Raleigh, North Carolina 27614 Phone: [phone] Fax: (9l9) 846-9467
www.SandEC.com
Division of Water Quality
Attn: Cyndi Karoly /Ian McMillan
2321 Crabtree Boulevard
Suite 250
Raleigh, NC 27604
November 14, 2007
,_N ,_ EC Project # 3099.W2
~: ~. , ~
~k~~~~ ~~r~~~,~i~~~~.~;~a DWQ No.#07-1538
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C~C~t~'i ~ - J'i{\1 f:i~ C.2l.P~LiYV
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Re: Reply to the Division of Water Quality's 10/25/07 request for additional information
Arbor Chase Subdivision
Wake County, North Carolina
Dear Ms. Karoly and Mr. McMillan:
This letter is in response to your letter dated October 25, 2007 which requested additional
information for the proposed Arbor Chase Subdivision. The following restates your
questions/comments and is then followed by our response.
Additional Information Requested
Level Spreader:
a. Please label the level spreaders on the plans and reference these
labels in the Level Spreader Worksheets.
b. Please relocate both 61 foot level spreaders further downslope,
adjacent to the wetlands, to avoid the steep areas downslope of their
currently proposed locations.
c. Please ensure that all riprap dissipater pads at the end of the bypass
structures are designed so that the downslope stormwater flow is
non-erosive (i.e., not exceeding two feet per second during the ten-
yearstorm).
d. The level spreader detail on site plan should include the forebay.
Please see the attached letter from Mr. Alan Keith, PE, of Diehl & Phillips, PA which answers the
above questions in detail. Additionally, revised construction drawings have been attached per
your request.
2. A detail of the flow splitter box should be shown on the plans. DWQ has
noted that it was included in the calculation sheets.
Charlotte Office: Greensboro Office:
236 LePhillip Court, Suite C 3817-E Lawndale Drive
Concord, NC 28025 Greensboro, NC 27455
Phone: [phone] Phone: [phone]
Fax: [phone] Fax: [phone]

Please see the attached revised construction drawings which now show a detail of the flow splitter
box.
3. The submittal is missing pages 7, 10 and 17 of the calculation sheets. Please
show calculation for the 10 year storm discharge values (Q«~) for each
drainage area to the flow splitter box, and show calculation for the velocities
exiting the dissipater pads as discussed in 1 c. above.
Please see the attached letter from Mr. Alan Keith, PE, of Diehl & Phillips, PA which answers the
above questions in detail.
4. Please provide the approval letter and one copy of the approved Stormwater
Management Plan for the proposed development from Wake County or the
City of Raleigh. If Stormwater Management Plan is not required please
provide a letter from the appropriate jurisdiction to that effect. The percent
imperviousness of the total area draining to the wetland is such that a
Stormwater Plan MAY be required.
It should be noted that this project was submitted to and received by the NC DWQ on September
10, 2007. Per the NC DWQ website, "Any application for a General 401 Water Quality
Certification received on or before October 31, 2007, will be reviewed in accordance with the
conditions of the GC in effect on the date of the application. Any application received on or after
November 1, 2007 will be reviewed in accordance with the conditions of the new GC ".
Therefore, as stated in the initial application, this project is subject to the sormwater guidelines
of the GC 3631 which requires a Stormwater Management Plan for projects that have greater than
30% impervious. Please see the attached impervious calculations for the proposed Arbor Chase
Subdivision. This project is below 24% and therefore does not require a sormwater management
plan.
Please feel free to call me if you require any further explanation.
Sincerely,
Nicole J. Thomson
Regulatory Specialist
Attachments: 5 copies of Response letter
5 copies of Diehl & Phillips, PA, response letter
5 copies of Impervious Surface Calculations
5 copies of Revised Level Spreader Calculation worksheets
5 copies of Revised Construction Drawings
CC: Ms. Lauren Witherspoon, DWQ Raleigh Regional Office

DIEHL & PHILLIPS, P.A.
CONSULTING ENGINEERS
v1~ILLIAM C. DIEHL, P.E.
JOHN F. PHILLIPS, P.E.
ALAN R. KEITH, P.E.
219 East Chatham Street
Cary, North Carolina 27511
Telephone [phone] • Fax [phone]
MEMORANDUM
To: Whom It May Concern
~~ ~,,/~
From: Alan R. Keith, P.E.
Date: November 7, 2007
Re: Request for Additional Information
Arbor Chase Subdivision
In response to a letter dated October 25, 2007 from NCDWQ to Stephen
Eastman, we offer the following responses:
1. The level spreaders have been labeled on the construction plans as LS-1,
LS-2, and LS-3 to coincide with the Level Spreader Worksheets.
2. LS-1 has been relocated closer to the wetlands as requested by NC DWQ.
LS-2 cannot be moved closer to the wetlands without impacting the
wetlands. The clearing, grading, and stone strip downstream of the level
spreader lip would be in the wetlands if LS-2 is moved.
3. All rip rap velocity dissipators were designed according to NC Land
Quality methods using the NY DOT chart. The velocity dissipator
calculations are included in the Stormwater Calculations that are
enclosed. See Pipe P-8, P-9 and P-18 calculations. The velocity
dissipators are sized for Q-10 per the State Manual. The velocity
dissipators extend to the edge of the wetlands.
4. All level spreaders have a forebay. The forebay is shown in plan view on
the enclosed construction plan sheet, and the forebay is detailed on the
plan sheet also.
5. A detail for the flow splitter box is included on the enclosed construction
plan sheet.
6. The calculations for all pipes are included in the enclosed Stormwater
Calculations.
7. Enclosed is an approval letter from the City of Raleigh for the Arbor
Chase Subdivision Stormwater plan.

~~
~~
DIEHL & PHILLIPS, P.A.
CONSULTING ENGINEERS
219 East Chatham Street
Cary, North Carolina 27511
Telephone [phone] • Fax [phone]
MEMORANDUM
To: Whom It May Concern
From: Alan R. Keith, P.E.
Date: September 4, 2007
Re: Impervious Surface Coverage
Arbor Chase Subdivision
WILLIAM C. DIEHL, P.E.
JOHN F. PHILLIPS, P.E.
ALAN R. KEITH, P.E.
Arbor Chase Subdivision will be developed as R-6 cluster unit development per
the City of Raleigh. The allowable minimum lot size is less than 5,000 square
feet. However the minimum lot size proposed is greater than 5,600 square feet.
Fifty-one lots are proposed, although 160 dwelling units would be allowed under
the City zoning. The following is an estimate of the impervious surface
proposed for the project totaling 26.63 acres which includes over 15 acres of
Open Space:
Street Area
Sidewalk
Houses & patios
Driveways &walks
Total Impervious Surface
Total Project Area
70,044 sq ft
8,979 sq ft
124,950 sq ft
63,750 sq ft
267,723 sq ft
1,160,003 sq ft
Percent Impervious = 267,723/1,160,003 X 100% = 23.08%

i •S
DIVISION OF WATER QUALITY -LEVEL SPREADER WORKSHEET (112007)
I. PROJECT INFORMATION (please complete the following information):
Project Name : Arbor Chase Subdivision
Contact Person: Alan Keith, P.E. Phone Number. (919) 467 - 9972 ext. 25
Level Spreader I D: LS 1, JB - D, P-8
Level Spreader Length 61 ft.
Drainage Area 2.49 ac.
Impervious Area 1.05 ac.
Forebay Area 91 sq. ft.
Maximum Filter Strip/Buffer Slope 10*
*AFTER ± 50' FLOW DIFFUSES INTO WETLANDS >150'
WIDE SLOPE ~ 6
Max. Discharge from 1"/Hr Storm
Max. Discharge to Level Spreader
Filter Strip/ Zone 1 Buffer Vegetation
-- - ---
FilterStrip/ Zone 1-Buffer Width ft.
Filter Strip/ Zone 2 Buffer Vegetation
Filter Strip/ Zone 2 Buffer Width ft.
Bypass Method Used
1.5 cfs
1.5 cfs
Wetland
30 _ _ ft.
Forest/Wetland
>120' ft.
Pipe/Dissipator
(perpendicular to flow)
(on-site and off-site drainage to the level spreader)
(on-site and off-site drainage to the level spreader)
(0.2% of the contributing impervious surface area)
(6% for forested/leaf littler cover, 8% for grass/thick cover)
(Discharge rate from extended detention wetland or pond)
(Grass/Thick ground cover or Forested)
Please include a worksheet for this.
II. REQUIRED ITEMS CHECKLIST
Initial in the space provided to indicate the following design requirements have been met and supporting documentation is
attached. If a requirement has not been met, please explain why. At a minimum, a complete stormwater management plan
submittal includes a worksheet for each BMP, design calculations, plans and specifications showing all BMPs and outlet
structure details, a detailed drainage plan and a fully executed operation and maintenance agreement. An incomplete
submittal package will result in a request for additional information and will substantially delay final review and approval of
the project.
Applicants Initials
_~_ Project Site was visited prior to designing level spreader system.
~/~~ ~'7 Date of the Site visit. Please attach time-dated digital photos of existing buffer conditions.
R26~ Level spreader length is at least: 13 ft. per cfs for thick ground cover /grass; OR 65 ft per cfs for 50-
footcanopied forest with leaf litter; 50 ft per cfs for 100-foot forested buffer; 40 ft. per cfs for 150-foot
forested buffer; OR a weighted average of the two vegetation types within the buffer/filter strip).
~~L All ground cover types and their widths have been labeled on the construction plans.
~q,~~. All contours have been depicted on the construction plans.
,.q:~ No structures are located in protected buffers (must meet no practical alternatives criteria).
~Q.~~ No draws are located in the buffer or filter strip in the vicinity of the proposed level spreader.
,~~c Construction details forthe level spreader have been provided.
~,t,~ The operation and maintenance agreement signed and notarized by the responsible party is provided.
ice- No practical alternatives explanation + Variance request. (Level Spreaders in Series only).
Bypass method used:
~~,~~ Bypass conveyance method is specified and construction details and calculations are provided.
~~°,.o Alternative design option is specified and plan details and calculations are provided.
~.~.~~ Discharge to level spreader and subsequent filter strip is hydraulically and spatially separate from the
bypass discharge.
;aq,~ Construction details for the bypass and outlets are provided.

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i
DIVISION OF WATER QUALITY -LEVEL SPREADER WORKSHEET (1/2007)
I. PROJECT INFORMATION (please complete the following information):
Project Name : Arbor Chase Subdivision
Contact Person: Alan Keith, P.E. Phone Number. (919) 467 - 9972 ext. 25
Level Spreader ID: LS 2, JB - J, P-11
Level Spreader Length 61 ft.
Drainage Area 2.47 ac
Impervious Area 1.22 ac
Forebay Area 112 sq
Maximum Filter Strip/Buffer Slope 8*
*AFTER ± 20' FLOW DIFFUSES INTO WETLANDS
WIDE SLOPE c 6
Max. Discharge from 1 "/Hr Storm 1.5 cf:
Max. Discharge to Level Spreader 1.5 cf:
Filter Strip/ Zone 1 Buffer Vegetation Wetland
Filter-Strip/-Zone-1-Buffer Width ft: 30 - - ft.
Filter Strip/ Zone 2 Buffer Vegetation Forest/Vlletland
Filter Strip/ Zone 2 Buffer Width ft. >150' ft.
(perpendicular to flow)
(on-site and off-site drainage to the level spreader)
(on-site and off-site drainage to the level spreader)
. ft. (0.2% of the contributing impervious surface area)
(6% for forestedlleaf littler cover, 8% for grass/thick cover)
> 150'
(Discharge rate from extended detention wetland or pond)
(Grass/Thick ground cover or Forested)
Bypass Method Used Pipe/Dissipator
Please include a worksheet for this.
II. REQUIRED ITEMS CHECKLIST
Initial in the space provided to indicate the following design requirements have been met and supporting documentation is
attached. If a requirement has not been met, please explain why. At a minimum, a complete stormwater management plan
submittal includes a worksheet for each BMP, design calculations, plans and specifications showing all BMPs and outlet
structure details, a detailed drainage plan and a fully executed operation and maintenance agreement. An incomplete
submittal package will result in a request for additional information and will substantially delay final review and approval of
the project.
Applicants Initials
~~-~~ Project Site was visited prior to designing level spreader system.
~j~sa,/~ ~ Date of the Site visit. Please attach time-dated digital photos of existing buffer conditions.
r~.~~~. Level spreader length is at least: 13 ft. per cfs for thick ground cover./ grass; OR 65 ft per cfs for 50-
footcanopied forest with leaf litter; 50 ft per cfs for 100-foot forested buffer; 40 ft. per cfs for 150-foot
forested buffer; OR a weighted average of the two vegetation types within the buffer/filter strip).
~+~-~c All ground cover types and their widths have been labeled on the construction plans.
~~,~,~,~ All contours have been depicted on the construction plans.
.~4e6~~ No structures are located in protected buffers (must meet no practical alternatives criteria).
_~~,~ No draws are located in the buffer or filter strip in the vicinity of the proposed level spreader.
~AI'n.~~ Construction details for the level spreader have been provided.
-~~~P'~ The operation and maintenance agreement signed and notarized by the responsible party is provided.
~//~ No practical alternatives explanation + Variance request. (Level Spreaders in Series only).
Bypass method used:
~4~~-~~ Bypass conveyance method is specified and construction details and calculations are provided.
i~~fr{ Alternative design option is specified and plan details and calculations are provided.
,~~iC Discharge to level spreader and subsequent filter step is hydraulically and spatially separate from the
bypass discharge.
Q4~~'~ Construction details for the bypass and outlets are provided.

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DIVISION OF WATER QUALITY • LEVEL SPREADER WORKSHEET (112007)
I. PROJECT INFORMATION (please complete the following information):
Project Name : Arbor Chase Subdivision
Contact Person: Alan Keith, P.E. Phone Number: (919) 467 - 9972 ext. 25
Level Spreader ID: LS 3, JB - 0, P-18
Level Spreader Length 76 ft.
Drainage Area 3.08 ac.
Impervious Area 1.53 ac.
Forebay Area 136 sq. ft.
Maximum Filter Strip/Buffer Slope 9*
*AFTER ± 20' FLOW DIFFUSES INTO WETLANDS >150'
WIDE SLOPE ~ 6
Max. Discharge from 1 "/Hr Storm 1.9 cfs
Max. Discharge to Level Spreader 1.9 cfs
Filter Strip/ Zone 1 Buffer Vegetation Wetland
Filter Strip/Zone 1 BufferWidth ft: - - - 30 ft.
Filter Strip/ Zone 2 Buffer Vegetation Forest/Wetland
Filter Strip/ Zone 2 Buffer Width ft. >150' ft.
Bypass Method Used Pipe/Dissipator
(perpendicular to flow)
(on-site and off-site drainage to the level spreader)
(on-site and off-site drainage to the level spreader)
(0.2% of the contributing impervious surface area)
(6% for forested/leaf littler cover, 8% for grass/thick cover)
(Discharge rate from extended detention wetland or pond)
(Grass/Thick ground cover or Forested)
Please include a worksheet for this.
II. REQUIRED ITEMS CHECKLIST
Initial in the space provided to indicate the following design requirements have been met and supporting documentation is
attached. If a requirement has not been met, please explain why. At a minimum, a complete stormwater management plan
submittal includes a worksheet for each BMP, design calculations, plans and specifications showing all BMPs and outlet
structure details, a detailed drainage plan and a fully executed operation and maintenance agreement. An incomplete
submittal package will result in a request for additional information and will substantially delay final review and approval of
the project.
Applicants Initials
h~~. Project Site was visited prior to designing level spreader system.
¢,i~ d~ Date of the Site visit. Please attach time-dated digital photos of existing buffer conditions.
_~~.: _ Level spreader length is at least: 13 ft. per cfs for thick ground cover /grass; OR 65 ft per cfs for 50-
footcanopied forest with leaf litter; 50 ft per cfs for 100-foot forested buffer; 40 ft. per cfs for 150-foot
forested buffer; OR a weighted average of the two vegetation types within the buffer/filter strip).
~aa.L All ground cover types and their widths have been labeled on the construction plans.
_~~,~~_ All contours have been depicted on the construction plans.
_~q~i_ No structures are located in protected buffers (must meet no practical alternatives criteria).
,~.~:~.: No draws are located in the buffer or filter strip in the vicinity of the proposed level spreader.
~~ ~~_ Construction details for the level spreader have been provided.
~,+,~~~ The operation and maintenance agreement signed and notarized by the responsible party is provided.
,~~';~ No practical alternatives explanation + Variance request. (Level Spreaders in Series only).
Bypass method used:
f~t4 ~ Bypass conveyance method is specified and construction details and calculations are provided.
,~~.f,~, Alternative design option is specified and plan details and calculations are provided.
.Cl,~,~ Discharge to level spreader and subsequent filter strip is hydraulically and spatially separate from the
bypass discharge.
~l~-7c~ Construction details for the bypass and outlets are provided.

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8" D.1. TO LEVEL
SPREADER
PLAN
FLOW SPLITTER (JUNCTION BOX D)
NO SCALE
WEIR HEIGHT (H)
STRUCTURE H(FT.)
D 1.06
J 1.05
0 1.14
A
TO BYPASS
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SECTION "AA"
FLOW SPLTITER
NO SCALE

~ x
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JUNCTION BOX
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SPREADER
8" D.l. TD LEVEL
SPREADER
A
TO BYPASS
INLET
A~
PLAN
~-
0
FLOW SPUTTER (JUNCTION BOX J & O)
NO SCALE
FLOW SPLI TTER BOX
2.5
i
8" D.I.
LEVEL SPREADER No. LENGTH, L WIDTH, IN
1 15 7
2 i6 7
3 17 8
INFLUENT
~~ STORMWA TER
---~ \

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TO LEVEL
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W11H FlLTER FABRIC
FOREBAY DETAIL
NO SCALE

AJ i, a `f
LEVEL SPREADER WEIR, CONCRETE,
OR CII~J WITH BLOCK CORE
FILLED WITH GOI~K:RETE
JUTE M4ANG OR NgR~H
AI4~RICAN GREEN SC 250
4' MIN. _ ~ , _ 3' MIN.
3 3
~ r I f_
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CONCRETE FOOTER
Na 57 hlAS~ED
5701
f3" ~ 3 _4~
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SECTION A A
p~NS
LEVEL SPREADER DATA
STRUCTURE Q'' (CFS) LENGTH (FT)
J.B. D 1.38 61
J.B. J 1.37 61
J.B. 0 1.71 76
FOREB4Y CLASS 'B'
R1P-RAP (15" THICK)
IMTH FlLTER FA~41C
SEE D!E fAlL
J I \,

Lll
J

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w A

w

JUTE M4TANG OR NORTH
AII~PoCAN GREEN SC 250
A
LEVEL SPREADER WEIR -
LEVEL EMIRE LENGIH
~ ,, ~ ~ ~ ~- No. 57
I---µ --I I, '-~I STOVuE
LEVEL SPREADER DETAIL
NO SCALE