20040679 Ver 1_Complete File_20040701

:7i
I&M
May 5, 2004
Ms. Debbie Edwards
NCDENR - Division of Water Quality
WETLANDS 401 K UNIT
2321 Crabtree Boulevard
Raleigh, North Carolina 27604
Re: Providence Place - Amenity Site
(Formally Morris Station Subdivision)
DWQ Project No. 04-0084
Dear Ms. Edwards:
"I'LANDs / 401 GROUP
MAY 0 6 2004
"IAIcR QUALITY SECT101V
On April 22, 2004 we provided supplemental information for the Town home section in the above referenced
subdivision. Attached are additional supplemental calculations, details, and exhibits for the Amenity Site. The
calculations are for five (5) grassed swales. These swales pre-treat the stormwater runoff generated from the
Amenity Site prior to entering the single-family stormwater ponds.
This additional information should allow you to continue with the review of the referenced 401 Water Quality
Certification for the Express Review Program. Specifically, we are providing you with the following:
A. A vicinity map of the subdivision with the Amenity Site shaded.
B. An exhibit of the Amenity Site showing the locations of the proposed grassed swales.
C. Grassed swale worksheets and sections for all five (5) swales.
D. A signed and notarized Operations & Maintenance Manual and Maintenance Agreement.
E. A copy of the vegetation plan.
F. Referenced information used for hydraulic calculations.
If you have any questions relative to the attached information or hydraulics I will make myself available to meet
with you and/or your new hydraulic engineer and your convenience.
Very truly yours,
RICE oovmwa. & ASSOCIATES
of 4AW_
Cameron M. Rice, P.E.
cc: Kevin Martin (w/ attachments)
Craig Lang (w/ attachments)
KILL &
ASSOCIATES
978 Trinity Road • Raleigh, North Carolina 27607 • Voice 919.854.0811 • Fax [phone] • Email: [e-mail]
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DWQ Project No. Oaf - 00 S g-
DMSION OF WATER QUALITY - GRASSED SWALE WORKSHEET
t. PROJECT INFORMATION (please complete the following information).
Project Name: PF_oVtpearcE PLstc-E (FoAmALA-1 rno(zF-tS r?rRTfoN
Contact Person: CAr-?eR•o" m- W-IGE , P. E. Phone Number. ( 11100 8 5 4 -o E51 I
Swale 1D: &I
Grass Swale Length
Tributary Drainage Area
Impervious Area
Max. Velocity from 2 Yr. Storm
Max. Velocity from 10 Yr. Storm
Min. side slopes
Steepest Effective Slope
Cover Crop
II. REQUIRED ITEMS CHECKLIST
3? a ft.
o•? q ac.
D, So ac.
2.0 fps
. t fps
3= 1 ratio
0.00-7 ftlft
TALL rer540 is
(at least 100 ft. per tributary acre)
(on-site and off-site drainage to the Swale)
(on-site and off-site drainage to the swale)
(2 fps max.)
(3:1 min.)
(check dams may be used)
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, attach an explanation of 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
c'tg Vegetation Plan provided on plans 8 Z? I 1 ?T??cftM?N r
C•+k?The underlying soils are permeable and non-compacted
e,tA (L- Swale carries only stormwater flow
Gry(L Water table depth is greater than 1 foot. ( WA-re-0- S?FA'6 ELEVAT)o.J G IL 114 elft-e-
G Inn (r-- Plan details for the swale provided. (SCE A-r-rAc. Ve t> t rF? r31'r )
G M12-- Plan details for the inlets and outlets are provided. 5l+ow N . ©m P (,RN s
Gly4 (2- Check dams provided. C No, stir,(. -7&opEs crs5 -rMA?J 4'/0 )
4w_ The operation and maintenance agreement includes annual erosion and vegetation repair, and at least twice
annual mowing. CSEC ATrA c_" u FJ7
G?N The operation and maintenance agreement signed and notarized by the responsible party is provided.
n/?noylTE FtA'florj^- 60,Ft=Ftc-ICiJ-r (p.RS??a,So ) t t!o.ZZ??o 2`I )
0.7 5
Q2= Cr A - CohB?(s.??)(m.7g ) •- 3.l c?5
o. 4$
Qlo : G Z A % 0•(9°v??"1.2Z?(D?7°1 J - 3. 9 G-(?
1
3
84"
58"
12 IN 7.6 IN.
12 IN.
Q2 = 3.1 CFS
SLOPE = 0.7%
MANNING'S N = 0.030
HEIGHT = 12 IN.
SIDE SLOPES = 3:1
DEPTH OF FLOW: 6.8 IN
VELOCITY = 2.0 FPS
TOP WIDTH = 54 IN.
BOTTOM WIDTH = 12 IN.
TALL FESCUE
010 = 3.9 CFS
SLOPE = 0.7%
MANNING'S N = 0.030
HEIGHT = 12 IN.
SIDE SLOPES = 3:1
DEPTH OF FLOW: 7.6 IN.
VELOCITY = 2.1 FPS
TOP WIDTH = 58 IN.
BOTTOM WIDTH = 12 IN.
3
GRASS SWALE #1 SECTION
1
NTS
DWQ Project No. O? - DO Q>g-
DIVISION OF WATER QUALITY - GRASSED SWALE WORKSHEET
1. PROJECT INFORMATION (please complete the following information).
Project Name: PR 0VI10en?cE pi Ac.E ( FoAAAAU-y Mvgl?L(5 yrgTivN)
Contact Person: GA>?ea oN m- Iz Ic-E , P. C. Phone Number (91 `l) !65+ -o g ?1
Swale ID: 2--
Grass Swale Length / Z O ft. (at least 100 ft. per tributary acre)
Tributary Drainage Area O•z/ ac. (on-site and off-site drainage to the swale)
Impervious Area ac. (on-site and off-site drainage to the Swale)
Max. Velocity from 2 Yr. Storm ? fps (2 fps max.)
Max. Velocity from 10 Yr. Storm 2.1 fps
Min. side slopes 3 1 ratio (3:1 min.)
Steepest Effective Slope O.0 3 9 ft/ft (check dams may be used)
Cover Crop -TALL I^'ESc.I G
IL 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, attach an explanation of 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
8 Lr` I 1 . AT?AcEt? f
N Vegetation Plan provided on plans
C. e t The underlying soils are permeable and non-compacted
6-tA (L- Swale carries only stormwater flow
CA4L- Watertabledepth isgreaterthan 1 foot. (WhTEIL 1;1-9FA-15 CLEvA-rin...l < iZ w?t?es
L IM (t- Plan details for the swale provided. (seE A T TA r FVE D a_441r3110
)
C 'Mg- Plan details for the inlets and outlets are provided. <i4+owN cm, P CAS 5 )
4-' wt(2- Check dams provided. C No, Au gL.opES (- rs5 Tr}Aa 40/
61;w- The operation and maintenance agreement includes annual erosion and vegetation repair, and at least twice
annual mowing. C SEG A-C-p+c44 M 6N 7 'S-
GWt l2 The operation and maintenance agreement signed and notarized by the responsible party is provided.
CO Iv, t?p?I T is tZ AT I D N /-t„ GO,EF F i G I EP3T
V. 24
Qy- CT a - (a•t??l(5.????0.21 - 0.30 C4
Q p G L A. (o. Z C 1.22 ?{ o. 21 ,= D, 3 g e 5
3
84"
21"
12 IN
1.6 IN.
12 IN.
02 = 0.30 CFS
SLOPE = 3.9%
MANNING'S N = 0.030
HEIGHT = 12 IN.
SIDE SLOPES = 3:1
DEPTH OF FLOW: 1.4 IN
VELOCITY = 2.0 FPS
TOP WIDTH = 20 IN.
BOTTOM WIDTH = 12 IN
TALL FESCUE
010 = 0.38 CFS
SLOPE = 3.9%
MANNING'S N = 0.030
HEIGHT = 12 IN.
SIDE SLOPES = 3:1
DEPTH OF FLOW: 1.6 IN.
VELOCITY = 2.1 FPS
TOP WIDTH = 21 IN.
BOTTOM WIDTH = 12 IN.
3
GRASS SWALE #2 SECTION
1
NTS
DWQ Project No. 04 - 00 8 4-
DIVISION OF WATER QUALITY - GRASSED SWALE WORKSHEET
1. PROJECT INFORMATION (please complete the following information):
Project Name PTzo V I DEN C6 ?LACt: (POP-MALA,'I NroR tzt S t?rR-rt oN
Contact Person: CA*-qea-oN m • P-•IcE P. E . Phone Number. (9I `t) S 5 4 -o E51
Swale ID: t- 3
Grass Swale Length 20 V ft. (at least 100 ft. per tributary acre)
Tributary Drainage Area 00.2.4 ac: (on-site and off-site drainage to the Swale)
Impervious Area 9.0 ac. (on-site and off-site drainage to the Swale)
Max. Velocity from 2 Yr. Storm -2,0 fps (2 fps max.)
Max. Velocity from 10 Yr. Storm Z • 1 fps
Min. side slopes 3 I ratio (3:1 min.)
Steepest Effective Slope P, X3 -1 Wit (check dams may be used)
Cover Crop -rAL.. rEScj
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, attach an explanation of 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
Vl Vegetation Plan provided on plans S L? I 1 ?'f ?AOttM t
C•M The underlying soils are permeable and non-compacted
6,1 I?-- Swale carries only stormwater flow
CJV(L Water table depth is greater than 1 foot. WATER- -1 tfAO& ELEVrt- Wi J IZ W aktes
L M (L Plan details for the swale provided, (scE A-r-rA c"t> e-441 gl -r )
G M R-• Plan details for the inlets and outlets are provided.. ( -iHow r! 014 P. (,AtJ5 )
V)_4 (2- Check dams provided. C No, AU gr.oPES or5.5 -rr+AAi 4% )
6we_ The operation and maintenance agreement includes annual erosion and vegetation repair, and at least twice
annual mowing. CSEC ArTA c_H m f,.) T s
Gw1 The operation and maintenance agreement signed and notarized by the responsible party is provided.
C__0AA1>0 I T E FLATI tjk- _ COEFFi?tCn1T Co RS?C O.O ? {Co•ZZZ'I .
0, L2-
?q
0 -
04 CT A (a.2?.1(5.??)(v. ) o• 30 .e?5
QIp _ GT A (o, 1.Z )c? 2Z-?Co•L4 - 0,38 c.?h
1L
3
84"
21"
12 IN
1.6 IN.
if 1
12 IN.
02 = 0.30 CFS
SLOPE = 3.9%
MANNING'S N = 0.030
HEIGHT = 12 IN.
SIDE SLOPES = 3:1
DEPTH OF FLOW: 1.4 IN.
VELOCITY = 2.0 FPS
TOP WIDTH = 20 IN.
BOTTOM WIDTH = 12 IN.
TALL FESCUE
010 = 0.38 CFS
SLOPE = 3.9%
MANNING'S N = 0.030
HEIGHT = 12 IN.
SIDE SLOPES = 3:1
DEPTH OF FLOW: 1.6 IN.
VELOCITY = 2.1 FPS
TOP WIDTH = 21 IN.
BOTTOM WIDTH = 12 IN.
3
GRASS SWALE #3 SECTION
1
NTS
DWQ Project No. 09 - DO 84-
DIVISION OF WATER QUALITY - GRASSED SWALE WORKSHEET
L PROJECT INFORMATION (please complete the following information):
Project Name: PRoV110ENcE 'PeAcE FoAmAl.?-y Moft)t15 r1rA-r(oN)
Contact Perrs?on: CA t-gP_ -&N m - Iz-1c.E , P. E . Phone Number (11111) 8 5 4 -0 8 l
Swale ID: N
Grass Swale Length .210 ft. (at least 100 ft. per tributary acre)
Tributary Drainage Area 0134 ac. (on-site and off-site drainage to the swale)
Impervious Area 9,03 ac. (on-site and off-site drainage to the swale)
Max. Velocity from 2 Yr. Storm .2.o fps (2 fps max.)
Max. Velocity from 10 Yr. Storm -Z z fps
Min. side slopes 3 1 ratio (3:1 min.)
Steepest Effective Slope ` O. 0 3 S ftift (check dams may be used)
Cover Crop -rAL , re-;'40('W
11. 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, attach an explanation of why. At a minimum, a complete stonnwater 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 Initiate
N Vegetation Plan provided on plans C t3 ZI 1 fk'f'lkcFt.?a?N f
CM The underlying soils are permeable and non-compacted
GNP (L-- Swale carries only stormwater flow
0-Ml Water table depth is greater than 1 foot. (WATE(- 4?15/t-6 ELEvftTlo?j < IZ rNe_ttss)
G wA (t-• Plan details for the swale provided. ( see A-r-rA c 1+e t) a-A +(P rr )
G mg- Plan details for the inlets and outlets are provided. (?iHow r4 ON P (,i?,1J5 )
G Wt (2 Check dams provided. ? No, 4u. gL,pEs (. rs5 -rr+A'o 4'/e )
61,W- The operation and maintenance agreement includes annual erosion and vegetation repair, and at least twice
annual mowing. C`?EG hTTA014 m"-r S )
G?H The operation and maintenance agreement signed and notarized by the responsible party is provided.
MctAPoS- l -fE F-ATrow (O•QS)(o•o3 f
/?'L-• ?E?F t c1 c1.1't- ?- _ d28
04, CI A A2.0 1?5.7(o)(0t3'f ?• ?? 4FS
/ Q1p GZ /? , (p,2?)??.2Z-.?(o,3q-? = 0.69 a?f5
96"
34"
12 IN
1 1.6 IN.
3
24 IN.
Q2 = 0.55 CFS
SLOPE = 3.5%
MANNING'S N = 0.030
HEIGHT = 12 IN.
SIDE SLOPES = 3:1
DEPTH OF FLOW. 1.4 IN.
VELOCITY = 2.0 FPS
TOP WIDTH = 32 IN.
BOTTOM WIDTH = 24 IN.
TALL FESCUE
010=0.69CFS
SLOPE = 3.5%
MANNING'S N = 0.030
HEIGHT = 12 IN.
SIDE SLOPES = 3:1
DEPTH OF FLOW: 1.6 IN.
VELOCITY = 2.2 FPS
TOP WIDTH = 34 IN.
BOTTOM WIDTH = 24 IN.
3
GRASS SWALE #4 SECTION
NTS
DWQ Project No. oq- DO 84
DMSION OF WATER QUALITY - GRASSED SWALE WORKSHEET
L PROJECT INFORMATION (please complete the following information):
Project Name: PAoVlpErrcE PLAc,E C FoAAnAt.r-y Mo(LJ??(5 CATION)
1
Contact Person: CA+-iea-- m • F-Ic-C , P. E . Phone Number. ( 9 ? q) lb 5 + -o E51
Swale ID:S
Grass Swale Length .2,3o ft. (at least 100 ft. per tributary acre)
Tributary Drainage Area 0.72 ac. (on-site and off-site drainage to the swale)
Impervious Area .0,3 0 ac. (on-site and off-site drainage to the Swale)
Max. Velocity from 2 Yr. Storm /.6 fps (2 fps max.) ( Nc12,144 ^M HISICOr,.t 6 (L4Z611 Se. 1-S- 1
Max. Velocity from 10Yr. Storm 1. 0 fps
Min. side slopes 3 1 ratio (3:1 min.)
Steepest Effective Slope ©, 0 3 9 Wit (check dams may be used)
Cover Crop -rAL .- rESw LW
Il. 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, attach an explanation of 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
N -Vegetation Plan provided on plans 11 A 7AcI•tAE-tJr
C .-M The underlying soils are permeable and non-compacted
GNP t?- Swale carries only stormwater flow
C_ A42--, Water table depth is greater than 1 foot. WATER- 515WA-6 ELEvA-n-o J < 12- tNGl4ES
L vin (i- Plan details for the swale provided. (s,aE A T-rA c Hett> r=x! t F31'r
G rM g- Plan details for the inlets and outlets are provided. (4f+ow N oN P L A. 4 5 )
C_ to R- Check dams provided. ( No, Au y&oyEs (. T#+AAJ 4'i. )
64G- The operation and maintenance agreement includes annual erosion and vegetation repair, and at least twice
annual mowing. C SEC htTR c 4 mF_.,,j T s
liWl The operation and maintenance agreement signed and notarized by the responsible party is provided.
'LbMChoyiTE FzA?ror?^„ GoEFFtcicnlT CO.RS?(D•38 {(0•z2)C'P-3f) O•(o?
0,72-
04 C-_r q 69,4 0,72) z.s
Q,o . c z A . (0,10 0, 72- = 3; 2 Mfr
3
NORTH AMERICAN
GREEN (SC250)
108°
58°
12 IN
5.7 IN.
24 IN.
02 = 2.5 CFS
SLOPE = 3.9%
MANNING'S N = 0.07
(SC250 TRM)
HEIGHT = 12 IN.
SIDE SLOPES = 3:1
DEPTH OF FLOW: 5.0 IN.
VELOCITY = 1.8 FPS
TOP WIDTH = 54 IN.
BOTTOM WIDTH = 24 IN.
3
TALL FESCUE
010 = 3.2 CFS
SLOPE = 3.9%
MANNING'S N = 0.070
(SC250 TRM)
HEIGHT = 12 IN-
SIDE SLOPES = 3:1
DEPTH OF FLOW: 5.7 IN.
VELOCITY = 2.0 FPS
TOP WIDTH = 58 IN.
BOTTOM WIDTH = 24 IN.
GRASS SWALE #5 SECTION
NTS
OPERATIONS AND MAINTENANCE MANUAL
MAINTENANCE AGREEMENT
for
PROVIDENCE PLACE AMENITY SITE
(FORMALLYMORRIS STATION)
1. INTRODUCTION
This manual and agreement establishes procedures and acknowledges ownership for the
inspections and maintenance of the grassed swales at the Providence Place Amenity Site in
Morrisville, North Carolina. All grassed swales shall be inspected quarterly. If
maintenance is required as part of the quarterly inspection, the work should be completed
immediately following the inspection.
II. MAINTENANCE OF GRASSED SWALES
Maintenance shall be performed as follows:
A. At least once annually, remove excess sediment, especially from the upstream edge, to
maintain original contours and grading.
B. At least once annually, repair any erosion and regrade the swale to ensure that the
runoff flows evenly in a thin sheet through the swale.
C. At least once annually, inspect vegetation and revegetate the swale to maintain a dense
growth of vegetation.
D. Proposed check dams shall be inspected quarterly and vegetation maintained for these
areas.
E. Grassed swales shall be mowed as needed to a minimum height of six inches and a
maximum of 10 inches. Acceptable methods include the use of weed whips or power
brush cutters and mowers.
F. Grassed swales should be fertilized every October and April.
G. Re-seeding - Periodically, re-seeding may be required to establish grass on areas
where seed did not take or has been destroyed. Before seeding, fertilizer (12-12-12)
should be applied at a minimum rate of 12 to 15 pounds per 1,000 SF. The seed should
be evenly sewn at a rate of three pounds per 1,000 SF. The seed should be covered
with soil to the depth of approximately 1/4". Immediately following the planting, the
area should be mulched with straw.
H. Grassed swales shall be watered during the summer months to keep the vegetation
healthy and dense, so that it will be effective during the first autumn rains.
t
III. MAINTENANCE AGREEMENT
PROJECT: Providence Place (formally Morris Station Subdivision) - Amenity Site
OWNER: Fortis Westminster
RESPONSIBLE PARTY: Fortis Westminster PHONE #: [phone]
ADDRESS: 3500 Regency Parkway, Suite F
NC 27511
Fortis Westminster hereby acknowledges that it is the financially responsible party for
maintenance of the grass swales at the above-referenced project. It will perform all maintenance
and upkeep of the grass swales in accordance with the operations and maintenance manual
prepared by Rice & Associates, dated May 4, 2004. If a homeowner association is created for the
subdivision, Fortis Westminster shall have the option of passing on all financial responsibility for
the maintenance and upkeep of the grass swales or continue to be the financially responsible party.
Signature: a - ?t a?? ?/ Date: 5 6f?
I,?G ri r t A?tl ? M 14 , a Notary Public for the State of County of
`y4 bj, e , do hereby certify that Cra a' LeL^q personally appeared before
me this day of M &4 , 200 and acknowledge due execution of the foregoing
instrument. Witness my hand an official seal,
A. R.•
Q: pTAlq • •'?y
Seal Y
r? •
C
My commission expiresOah?,,
2
SEEDBED PREPARATION
1. CHISEL COMPACTED AREAS AND SPREAD TOPSOIL 3 INCHES DEEP OVER ADVERSE
SOIL CONDITIONS, IF AVAILABLE.
2. RIP THE ENTIRE AREA TO 6 INCHES DEPTH.
3. REMOVE ALL LOOSE ROCK, ROOTS, AND OTHER OBSTRUCTIONS LEAVING SURFACE
REASONABLY SMOOTH AND UNIFORM.
4. APPLY AGRICULTURAL LIME, FERTILIZER, AND SUPERPHOSPHATE UNIFORMLY AND MIX
WITH SOIL (SEE BELOW).
5. CONTINUE TILLAGE UNTIL A WELL PULVERIZED, FIRM, REASONABLY UNIFORM SEEDBED
IS PREPARED 4 TO 6 INCHES DEEP.
6. SEED ON A FRESHLY PREPARED SEEDBED AND COVER SEED LIGHTLY WITH SEEDING
EQUIPMENT OR CULTIPACK AFTER SEEDING.
7. MULCH IMMEDIATELY AFTER SEEDING AND ANCHOR MULCH.
8. INSPECT ALL SEEDED AREAS AND MAKE NECESSARY REPAIRS OR RESEEDINGS
WITHIN THE PLANTING SEASON, IF POSSIBLE. IF STAND SHOULD BE OVER 60%
DAMAGED, REESTABLISH FOLLOWING ORIGINAL LIME, FERTILIZER AND SEEDING RATES.
9. CONSULT CONSERVATION INSPECTOR ON MAINTENANCE TREATMENT AND FERTILIZATION
AFTER PERMANENT COVER IS ESTABLISHED.
* APPLY: AGRICULTURAL LIMESTONE - 2 TONS/ACRE (3 TONS/ACRE IN CLAY SOILS)
FERTILIZER - 1,000 LBS/ACRE - 10-10-10
SUPERPHOSPHATE - 500LBS/ACRE - 20% ANALYSIS
MULCH - 2 TONS/ACRE - SMALL GRAIN STRAW
ANCHOR - ASPHALT EMULSION ® 300 GALLONS/ACRE
SEEDING SCHEDULE
SHOULDERS, SIDE DITCHES, SLOPES (MAX. 3:1)
DATE TYPE PLANTING RATE
AUG 15 - NOV 1 TALL FESCUE 300 LBS/ACRE
NOV 1 - MAR 1 TALL FESCUE 300 LBS ACRE
& ABRUZZI RYE 25 LBS ACRE
MAR 1 - APR 15 TALL FESCUE 300 LBS/ACRE
APR 15 - JUN 30 HULLED COMMON BERMUDAGRASS 25 LBS/ACRE
JUL 1 - AUG 15 TALL FESCUR AND 120 LBS/ACRE
*** BROWNTOP MILLET 35 LBS/ACRE
*** OR SORGHUM-SUDAN HYBRIDS 30 LBS/ACRE
SLOPES (3:1 TO 2:1)
MAR 1 - JUN 1 SERICEA LESPEDEZA (SCARIFIED) 50 LBS/ACRE

(MAR 1 - APR 1 DD TALL FESCUE 120 LB
ACRE
(
MAR 1 - JUN 3 I
R ADD WEEPING LOVEGRASS S/
10 LBS ACRE
(
MAR 1 - JUN 3 R ADD HULLED COMMON BERMUDAGRASS 25 LBS/ACRE
JUN 1 - SEP 1 ***TALL FESCUE AND 120 LBS ACRE
***BROWNTOP MILLET 35 LBS ACRE
***OR SORGHUM-SUDAN HYBRIDS 30 LBS/ACRE
SEP 1 - MAR 1 SERICEA LESPEDEZA (UNHULLED-UNSCARIFIED) 70 LBS/ACRE
AND TALL FESCUE 120LBS/ACRE
(NOV 1 - MAR 1)ADD ABRUZZI RYE 25 LBS/ACRE
CONSULT CONSERVATION ENGINEER OR SOIL CONSERVATION SERVICE FOR ADDITIONAL
INFORMATION CONCERNING OTHER ALTERNATIVES FOR VEGETATION OF DENUDED AREAS.
THE ABOVE VEGETATION RATES. ARE THOSE WHICH DO WELL UNDER LOCAL CONDITIONS;
OTHER SEEDING RATE COMBINATIONS ARE POSSIBLE
VEGETATION PLAN
Depth-Duration-Frequency Table
Location: __? Raleigh-Durham, NC
Return Period >
Duration 2-yr

5 min 0.48
10 min 0.79
15 min 1.01
30 min 1.35
60 min 1.70
2 hr 1.91
3 hr .2.12
6 hr 2.65
12 hr 3.13
24 hr 3.60
Intensity-Duration-Frequency Table
Location: -? Raleigh-Durham, NC
Return Period -?
Duration 2-yr
[ink]
5 min 5.76
Exhibit 2 by H. R. Malcom, P.E.
C. E. Dept, NCSU
Raleigh, NC ,
0.55 0.60 0.68 0.75
0.92 1.02 1.17 1.28
1.18 1.31 1.51 1.66
1.64 1.85 2.16 2.40
2.12 2.41 2.84 3.17
2.40 2.74 3.23 3.61-
2.68 3.07 3.62 4.06
3.38 3.90 4.62 5.19
4.02 4.64 5.52 6.20
4.65 5.38 6.41 7.21
100-yr
[in]
0.81
1.40
1.81
2.64
3.50
4.00
4.49
5.75
6.88
8.00
10 min 4.76
15 min
30 min 4.04
2.70
60 min 1.70
2 hr 0.95
3 hr 0.71
6 hr 0.44
12 hr 0.26
24 hr 0.15
Input Data:
5-yr 10-yr
[in/hr] [in/hr
6.58
5.54
4.74
3.28
2.12
1.20
0.89
0.56
.0.33
0.19
6.13
5.25
3.71
2.41
1.37
1.02
0.65
0.39
0.22
25-yr
[ice]
8.19
7.01
6.03
4.32
2.84
1.62
1.21
0.77
0.46
0.27
Raleigh-D
50-yr 100-yr
[ice] [ink]
8.96 9.72
7.71 8.40
6.64 7.24
4.80 5.28
3.17 3.50,
1.81 2.00
1.35 .1.50
0.86 0.96
0.52 0.57
0.30 0.33 'N
wr r-quanons: 7._ .5 I _, b : ; t
I = g/(h+T)
for5cT< 120 min
Location:
r
¦
w
D P
2 r P
100- Source g
uration -yr y 1
[m] [in) 2 2
13
5 169 21
5 min 0.48 0.81 NOAA HYDRO-35 10 195 22
.15 min 1.01 1.81 NOAA HYDRO-35 25 232 23
60 min 1.70 3.50 NOAA HYDRO-35 50 261 24
24 - hr 3.60 8.00 USWB TP-40 100 290 25
?- D ata -j
VI-3
5-yr 10-yr 25-yr 50-yr
[in] [in] [in] [in]
un, NC

Exhibit 1
Table of Rational runoff coefficients

Description C Source

Roof, inclined 1.00 Malcom
Street, driveway, sidewalk 0.95 Chow, 1964
Parking lot . 0.90 Malcom
Roof, flat 0.90 Malcom
Commercial, generalized 0.85 Malcom
Apartments, schools, churches 0.60 WSSC, c.1968
Residences, 10 dwellings/acre 0.60 Malcom
Residences, 6 dwellings/acre 0.55 Malcom
Residences, 4 dwellings/acre 0.50 Malcom
Residences, 2 dwellings/acre 0.40 Malcom
Unimproved cleared area 0.35 Malcom
Lawn, dense soil, steep >7% 0.35 Chow, 1964
Playground 0.35 Chow, 1964
Park, cemetery 0.25 Chow, 1964 -
ye Lawn, dense soil, avg 2-7% 0.22 Chow, 1964
Wooded, sparse ground litter 0.20 Malcom
Lawn, dense soil, flat 2% 0.17 Chow, 1964
Lawn, sandy, avg 2-7% 0.15 Chow, 1964
Lawn, sandy, flat Q% 0.10 Chow, 1964
Wooded, deep ground litter 0.10 Malcom

r
- r

r

VI-2 1

Michael F. Easley, Governor
William G. Ross Jr., Secretary
of Environment and Natural Resources
Alan W. Klimek, P. E. Director
Division of Water Quality
Coleen H. Sullins, Deputy Director
Division of Water Quality
DWQ Project # 04-0679
Wake County
Page 1 of 3
ez-11G
Fortis/Westminister Homes
Attn: Craig Lang
3500 Regency Pkwy., Suite F
Cary, NC 27511
Subject Properly: Providence Place (formerly Morris Station Subdivision)
UT to Kit Creek [03-06-05, 16-41-1-17-2-(0.3), C NSW (nutrient
sensitive)]
Approval of 401 Water Quality Certification with',Additional Conditions-EXPRESS
REVIEW PROGRAM
Dear Mr. Lang: ?.
You have our approval, in accordance with the attached' conditions and those listed
below, to place fill within or otherwise impact 0.09 acres of wetlands and 279 feet of
streams for the purpose of road crossings at the subject property, as described within
your application dated June 2, 2004 and received by the N.C. Division of Water Quality
(DWQ) on June 3, 2004 and additional information submitted on June 18, 2004 and
June 29, 2004. After reviewing your application, we have decided that the impacts are
covered by General Water Quality Certification Number 3404 (GC3404). The
Certification allows you to use Nationwide Permit(s) 14 when issued by the US Army
Corps of Engineers (USACE). In addition, you should obtain or otherwise comply with
any other required federal, state or local permits before you go ahead with your project
including (but not limited to) Erosion and Sediment Control and Non-discharge
regulations. Also, this approval to proceed with your proposed impacts or to
conduct impacts to waters as depicted in your application shall expire upon
expiration of the 404 or CAMA Permit.
This approval is for the purpose and design that you described in your application. If
you change your project, you must notify us and you may be required to send us a new
application. If the property is sold, the new owner must be given a copy of this
Certification and approval letter and is thereby responsible for complying with all
conditions. If total fills for this project (now or in the future) exceed one acre of wetland
or 150 linear feet of stream, compensatory mitigation may be required as described in
15A NCAC 2H .0506 (h). This approval requires you to follow the conditions listed in
the attached certification and any additional conditions listed below.
N. C. Division of Water Quality, 401 Wetlands Certification Unit,,
1650 Mail Service Center, Raleigh, NC 27699-1650 (Mailing Address)
?j? ?t[#5
2321 Crabtree Blvd., Raleigh, NC 27604-2260 (Location)
[phone] (phone), 919-733-6893 (fax), (http://h2o.enr.state.ne.us/ncwetlands)
Fortis/Westminister
Page 2 of 4
July 1, 2004
The Additional Conditions of the Certification are:
1. Impacts Approved
The following impacts are hereby approved as long as all of the other specific
and general conditions of this Certification (or Isolated Wetland Permit) are met.
No other impacts are approved including incidental impacts:
Amount
Approved Units Plan Location or Reference
Stream 279 feet IE1.0 and IE.40
404/CAMA
Wetlands 0.09 (acres) I E 1.0 and I E.40
Waters 0 acres
Buffers 0 (square ft.
2. Erosion & Sediment Control Practices
Erosion and sediment control practices must' be in full compliance with all
specifications governing the proper design, installation and operation and
maintenance of such Best Management Practices in order to protect surface
waters standards:
a. The erosion and sediment control measures for the project must be
designed, installed, operated, and maintained in accordance with the most
recent version of the North Carolina Sediment and Erosion Control Planning
and Design Manual.
b. The design, installation, operation, and maintenance of the sediment and
erosion control measures must be such that they equal, or exceed, the
requirements specified in the most recent version of the North Carolina
Sediment and Erosion Control Manual. The devices shall be maintained on
all construction sites, borrow sites, and waste pile (spoil) projects, including
contractor-owned or leased borrow pits associated with the project.
3. No Waste, Spoil, Solids, or Fill of Any Kind
No waste, spoil, solids, or fill of any kind shall occur in wetlands, waters, or riparian
areas beyond the footprint of the impacts depicted in the Pre-Construction
Notification. All construction activities, including the design, installation, operation,
and maintenance of sediment and erosion control Best Management Practices,
shall be performed so that no violations of state water quality standards, statutes,
or rules occur.
4. No Sediment & Erosion Control Measures w/n Wetlands or Waters
Sediment and erosion control measures shall not be placed in wetlands or waters
to the maximum extent practicable. If placement of sediment and erosion control
Fortis/Westminister
Page 3 of 4
July 1, 2004
devices in wetlands and waters is unavoidable, they shall be removed and the
natural grade restored within six months of the date that the Division of Land
Resources has released the project.
5. Certificate of Completion
Upon completion of all work approved within the 401 Water Quality Certification
or applicable Buffer Rules, and any subsequent modifications, the applicant is
required to return the attached certificate of completion to the 401/Wetlands Unit,
North Carolina Division of Water Quality, 1650 Mail Service Center, Raleigh, NC,
27699-1650.
6. Written Stormwater Management Plan
The final, written stormwater management plans (including a signed and
notarized Operation and Maintenance Agreement) dated May 5, 2004, April 22,
2004 and June 29, 2004, must be implemented and the stormwater management
facilities shall be constructed and operational before any permanent building is
occupied at the subject site. The structural stormwater practices as approved by
this Office as well as drainage patterns must be maintained in perpetuity. No
changes to the structural stormwater practices'shall be made without written
authorization from the Division of Water Quality:
7. Culvert Installation
Culverts required for this project shall be installed in such a manner that the
original stream profiles are not altered. Existing stream dimensions (including the
cross section dimensions, pattern, and longitudinal profile) must be maintained
above and below locations of each culvert. Culverts shall be designed and
installed to allow for aquatic life movement as well as to prevent head cutting of the
streams. If any of the existing pipes are or become perched, the appropriate
stream grade shall be re-established or, if the pipes installed in a perched manner,
the pipes shall be removed and re-installed correctly. Installation of culverts in
wetlands must ensure continuity of water movement and be designed to
adequately accommodate high water or flood conditions.
Violations of any condition herein set forth may result in revocation of this Certification
and may result in criminal and/or civil penalties. The authorization to proceed with your
proposed impacts or to conduct impacts to waters as depicted in your application and
as authorized by this Certification, shall expire upon expiration of the 404 or CAMA
Permit.
If you do not accept any of the conditions of this Certification (associated with the
approved wetland or stream impacts), you may ask for an adjudicatory hearing. You
must act within 60 days of the date that you receive this letter. To ask for a hearing,
send a written petition, which conforms to Chapter 150B of the North Carolina General
Statutes to the Office of Administrative Hearings, 6714 Mail Service Center, Raleigh,
Fortis/Westminister
Page 4 of 4
July 1, 2004
N.C. 27699-6714. This certification and its conditions are final and binding unless you
ask for a hearing.
This letter completes the review of the Division of Water Quality under Section 401 of
the Clean Water Act. If you have any questions, please telephone John Dorney at 919-
733-9646 or Debbie Edwards at 733-9502 in the Central Office in Raleigh.
AWK/DAE
Enclosures: GC 3404
Certificate of Completion
cc: Kevin Martin-S&EC
USACE Raleigh Regulatory Field Office
DWQ Raleigh Regional Office
DLR Raleigh Regional Office
File Copy
Central Files
Filename: 040679MorrisStation(Wake)401
Sincerely,
r ?
(&? LETTER OF
RICE &
ASSOCIATES
TO: Mr. John Dorney
Division of Water Quality
Wetlands/401 Unit
2321 Crabtree Blvd.
Raleigh, North Carolina 27604-2260
TRANSMITTAL
DATE: Nina 99 9n0a
RE: [:),-,,;,4 ---- of
Express Review Response
PN: 03-047
SENDING: ® Attached ? Under Separate Cover ® Via US Mail ? Overnight UPS/FedEx ? Courier ? To Be Picked Up By Recipient
One (1) copy of our response to your June 25, 2004 comments
WETL4 R ,
'fu 7 ROUp
UN 3 0 2094
c
WATa nj ..
WVAIII-ITYSECT01
COMMENTS:
The attached information is a follow-up copy in writing as required.
COPY TO:
SENT BY: C ?,-, -
Cameron M. Rice, P.E.
978 Trinity Road • Raleigh, North Carolina 27607 9 Voice 919.854.0811 9 Fax [phone] • Email: [e-mail]
Cameron Rice
From: Cameron Rice
Sent: Tuesday, June 29, 2004 8:58 AM
To: '[e-mail]; '[e-mail]
Cc: '[e-mail]; Steve Rice; Fred Rash; 'Lang, Craig; '[e-mail]'; 'Burdette, Jennifer
A SAW ; [e-mail]
Subject: Providence Place Subdivision: DWQ Proj. # 04-0679, Wake County (6-25-04)
Mr. Domey,
Attached is our response to your "Request For More Information - Express Reivew Program" letter dated June 25, 2004.
Please call me if you have any questions or comments.
Cameron M. Rice, P.E.
RICE & ASSOCIATES
978 Trinity Road
Raleigh, North Carolina 27607
Phone: [phone](ext. 105)
Fax: [phone]
Mobile: [phone]
Email: cmra-riceassociates.net
6/29/2004
11 1
I &a
RICE &
ASSOCIATES
June 29, 2004
Mr. John Domey
Division of Water Quality
Wetlands/401 Unit
2321 Crabtree Blvd.
Raleigh, North Carolina 27604-2260
(copy e-mailed; original mailed)
Re: Providence Place Subdivision - Town Home Section:
Morrisville, Wake County, North Carolina
DWQ Express Review Program: DWQ Project No.:
R&A Project No.: 03-047
Dear Mr. Domey:
Stormwater Management
04-0679
Rice & Associates is responding to the "Request for More Information - Express Review Program" letter sent
by the North Carolina's Division of Water Quality (DWQ) for the above referenced project. This response
is being provided within the four (4) day time period as required for the Express Review Program.
After review of your comments, we revised the calculations for Stormwater Detention Pond A to provide an
average depth of 3 feet. Attached are our revised DWQ 401 Wet Detention Basin Worksheet, revised
design calculations, and a revised Wet Detention Basin Operation and Maintenance Agreement.
If you should have questions or require additional clarification during the review please feel free to
contact me at [phone], extension 105.
Very truly yours,
RICE & ASSOCIATES

Cameron Rice, P.E.
cc: Craig Lang, Fortis Westminster
Kevin Martin, S & EC
Jennifer Burdette, USACE
Mitch Hayes, DWQ Raleigh Regional Office
978 Trinity Road 0 Raleigh, North Carolina 27607 • Voice 919.854.0811 • Fax [phone] • Email: [e-mail]
WET [WETLAND] DETENTION BASIN OPERATION AND MAINTENANCE AGREEMENT
[Wetland maintenance wording. is bracketed. Please modify the document as appropriate.]
'fi'r IDtt NC C i.rtt. {fir Q F4PI * 0+-44,'79 Pap" r ",g'd
The wet 1wettand] detention basin system is defined as the wet (wetland] detention basin, pretreatment
including forebays and the vegetated filter if one is provided.
Maintenance activities shalt be performed as follows:
1. After every significant runoff producing rainfall event and at least monthly.
a: Inspect the wet-fwe1+9rtdj detention basin system for sediment accumulation, erosion, trash
accumulation, vegetated cover, and general condition
b. Check and clear the orifice of any obstructions such that drawdown of the temporary pool occurs within
2 to 5 days as designed.
2, Repair eroded areas immediately, re-seed as necessary to maintain good vegetative cover, mow
vegetative cover to maintain a maximum height of six inches,, and remove trash as needed.
3 Inspect and repair the collection system ti e. catch basins, pining, swales, riprap, etc.) quarterly to
maintain proper functioning.
h. Remove accumulated sediment from the wet+weliarre deteni ion basin system semi-annually or when
depth is reduced to 75% of the original design depth (sea diagram below), Removed sediment shall be,
disposed of in an appropriate manner and shall be handled in a manner that will not adversely impact
water quality (l.e, stockpiling near a wet+we# detention basin or stream. etc,)
The measuring device used to determine the sediment elevation shaft be such that it will give an accurate
depth reading and not readily penetrate into accumulated sediments.
When the permanent pool depth reads feet in the main pond, the sediment shall be removed.
[For stormwater wetlands; If the elevation of the. marsh areas exceed the permanent pool elevation, the
sediment should be removed to design levels. This shall be performed by removing the upper 6 inches of
soil and stockpiling it. Thera the marsh area shall tae excavated six inches below design elevations-
Afterwards the stockpiled soil should be spread over the marsh surface The soil should not be stockpiled
for more than two weeks.]
When the permanent pool depth reads. feet In the forebay (and micro-pool], the sediment shall
be removed.
BASIN DIAGRAM
(fill in the blanks)
Permanent Pool Elevation 3z5
Vt-
75%
Sediment moval El, 3
3?! 75Sediment Rerroval Elevation °k
Bottorn Et vation 2v: LBo
ttom Elevation 25`?ln
EUREBAY MAIN POND
Page ? of _'

Pro oct tNes_ 1)W()---?J? (l?.t Fps' providecf by DiYQ)
DIVISIOI OI? WATER QUALITY - 401 WET DETENTION. BASIN WORKSHEKr
D} k'Q Sta?,nn7kyalcr hl rn c:tnent Plan Kev?icNv:
A complete stormwats:r managetttettt pl;.n submittal inclmli:s as vv-et dclCution basin'xvorkshect for each basin,
ticsign Calculations. plan. and slice itientions showing all hastn and outlet ;structure details. and a fully executed
operation and nminten ance- agrt>nuent_ An incomplete submittat package will re.ult in a request for additional
inforraraiion and will ,Ljbsl;'iniially delaN5 final review and approval of the project.
L f ITf), EUV INFOltahtA'JON (pleasr ci?)niplete +,he following irilortnattcml
ProjW Munc P Taww HoA6 Se.(-Tt0PJ
Col,1100 ll r%ow _ CAM W "? _ . » _:.,: I'hittic Nutnlacr' i'?1....J :.. _ $S?} -vl7l l_ >~r A/a5
Fol- pri},lt;c'ts with mu It ]Pic 1xisins, spuetfy <vhichh basin tit wvorkssheet applies to;
Bailn 11olli 111 T'levatacwn tp S5 it Laver e,el€v"ation of the floor ot the basin)
Pvrnaaneail. Pool VlcY;illttu 3Z5. 00 ll. {elevation of the orifice tliv'Crt Out)
'knit r}car;iry Pool N_ evMloli .3L61 '7t..? ft. (elevnuortof the outlet: atruc(ure invell ilk)
11cl- "Cadent Pok)I ! tgrl.li;e :` feii _ _ si.1 tt. (Avatir surf.ac,;C area it penuaitent pool elevation)
Dr atnta.w Aicll ac lon-s(te and off-site drainage to the hastn)
find *rvious Arv i ?-7 `ic (ott-silc- nand of -site drainage to [tit bass)
Poratl:anent Pined Vollinic _- 41r ZA 7 cu It iconibitied V011111t~ O IllaUl basin ti ld tlirt:bay)
a.`Cri'll'it ary P001 VOILIaatC ? or, _ cu. It. (volume detained on top ant the pe-mum rit pool)
1"ofrisky Volunlle sin ft
'SA7I.1111tbi:d isurf: ce 3rea to drainage area ratio)
Diatucie-1 of Orlficu iii. i;dravu down ontice diameter)
11. REQLJIRFD ITT(tts CITEC:KI.1ST
'I'he rollow irig checklist outlines design rrquirerucnts per the Sturruvwater Best Management Practices m anntal.
(N,(% Deparnnent of Em-nomnent. Health and Natural Resources, November 194)5) and Administrative Code
Sca:tion 15 A UC'.tC 2l l . 1008 . Initial ut die space provided to indicate the following design requircin ntrt 1 ave
beim met and siipporuny than urttetttatiswtt i-4 anached. t6d r4tpdrer jew has not heen aree, atiaach an ex/Aianati,on pf
ia;fi y.
Applicants lniual.s
g* 'i frc to mpurary?pcaol CtDlllrols runoff from the t ittch :stQ1mi event.
The basin longth to width ratio it greater than 3:1 _
The Kiwin side slope are nca.teelier than 3.1_
A submci- red and vegetated perimeter shelf at less than 6,1 is provided_
late- 'v'e-cuilion to the pc mr cm pool tle vation is specirts d.
by Ain ernerg ncy draiin is provided to drain the basin.
+ 1 hr }prim lent pool depth is between 3 and b feet (required m iiiraum of 3 feet:).
The ternporrary pool draws down to " to 5 days.
A `l°he forebay volume is approxirnatel=r equal to 20% of Elie total basin volume.
- Sedinienl storage is provided in tiz ti 1>e miattent pool,
if -Access is provided fiwrmaintcniincc.
_!1 minimum aft-foot veg> tative filter is provided at the outlet,
e: yi A aitc perific operation and mainlevance (O&M) plan is provided.
2 A ve etation management' rno% ving scliedule is provided in the O&M plant.
6:***?. ...... _. Seini- arnrual inspections are sliecif ed hi the O&M putt.
-_.._ y _ A dcbri, check is specified in the O&M plan to be. perforated after every startn event,
-O*L.__-_ A specific sediment clean-out benchmark is listed (elevation or depth) in 0&',4t plan.
3 A responsible party is designated in the 0(1,UM plan.
T`C7RM SWG 101) 0c).;9- Page i of I
5_ Remove cattails and other indigenous wetland plants when they cover 50% of the basin surface. These
plants shall be encouraged to grow along the vegetated shelf and forebay berm.
'gag ;d?3asitie?-?-t3te-mat?-are;
raw ' 6, . If the basin must be drained for an emergency or to perform maintenance, the flushing of sediment
through the emergency drain shah be minimized to the maximum extent practical.
T All componenis of the wet-fvetier detention basin system shall be maintained in good working order.
8 Level spreaders or other structures that provide diffuse flaw shall be maintained every six months. All
accumulated sediment and debris shall be removed from the structure, and a level elevation shall be
maintained across. the entire flow spreading structure. Any down gradient erosion must be repaired andlor
replanted as necessary.
I a0mowledge and agree by nay signature below that I am responsible for the performance of the seven
maintenance procedures listed above. I agree to notify DWO of any problems with the system or prior to any
changes to the system or responsible party.
Print nanae; ! SAL, A4
Title: t.-AwD Pevf'm?F,:#jT ? .4c4ut?'a:7can+
Aditress.. i wrr `t ±u F -A- t vm r-, 3-500 ft6eticy wf% _ hV ITE c ml' tit- z as i y
Phc
Sig
Dat
Note: The legally responsible party should not be a homeowners association unless more than 50% of the.
lots have been sold and a resident of the subdivision has been named the president.
ti
t; ,1 1^Y''t k?'?A a Notary Pubitc for the state of 144PAk 14 c:t4E Li-JA
County of WA yC do hereby certify that e o A te, i.. xr-? ei
personally appeared before me this AOI day of and acknowledge the due
execution of the forgoing wet {"t R41 detention basin maintenance requirements. Witness my hand; and
official seal,
*OTA*,p
-1110041110.
SEAL
My commission expires
Pa"C 2 of'_
Providence Place
Rice & Associates Proi. #03-047
Date: April 22, 2004 (Revised June 29, 2004)
By: Cameron Rice, P.E.
Stormwater Calculations for Pond 'W
Multi-Family Section "A" (MF-A)
Calculate the surface area for a wet detention pond
Wet Detention Pond Calculations (NCDENR's Stormwater BMP, April 1999)
Impervious Area = 30.0% (See Attachment "A2" for calculations)
Permanent pool depth = 4.5 feet
Average Pool Depth = 3.0 ft
Surface area/Drainage area ratio = 1.34 (From Table 1.1, copy attached)
Site area = 11.9 acres
SA/DA = 1.34
SA = (1.34/100)*(11.9 acres) = 0.159 acres = 6,926 sf
Volume to be Stored from the 1" Storm
Runoff Coefficient (Rv) = Storm runoff (in) / Storm rainfall (in)
Percent Impervious (1) = Drainage area (ac) / Impervious portion of DA (ac.)
Rv = 0.05 + .009 * (1)
= 0.05 + .009 * (30.0)
= 0.32 in/in
Vol. from 1" of Runoff = (Design rainfall) * (Rv) * (Drainage Area)
(1") * (0.32 in/in) * (11.9 ac.) * (lft/12in )* (43560 sf/ac.)
13,823 cf
Verify required surface area of pond
Area of permanent pool surface = 7,079 sf (normal water surface elevation, NSWE)
Area at NWSE > Required surface area
7,079 sf > 6,926 sf
Verify required volume to capture 1 " rainfall
Volume of permanent pool = 21,237 cf (normal water surface elevation, NSWE)
Elevation of permanent pool = 325
Volume of temporary pool = 14,000 cf
Elevation of temporary pool = 326.71
Volume provided > Volume Required
21,237 cf > 13,823 cf
G:\Projects\Mercury_Development\Morrisville_01 -062\_WORD\DWQ Express Review\Hydrau1ics\1-inch rain\Pond A.doc
Providence Place
Rice & Associates Proj. #03-047
Calculate Average Depth
Average Depth =
Average Depth =
Average Depth =
Volume Provided
Surface Area Provided
21,237 cf
7,079 sf
3.0 ft
Date: April 22, 2004 (Revised June 29, 2004)
By: Cameron Rice, P.E.
Volume to be Stored from the 1" Storm Calculate Diameter of Orifice
Temporary pool volume = 14,000 cf
Height of temporary pool = 1.71 feet
Drawdown time = 2 days or 172,800 seconds
Flowrate = 14,000 cf /172,800 sec = 0.081 cfs
Orifice Coefficient = 0.6
Area = (Q/C)/sgrt(2*G*H)
= (0.081 /0.6)/sgrt{(2)*(32.2)*(1.71)}
= 0.0129 sf
= 1.85 sq in
Diameter = sgrt(area* 4)/R
= sgrt{(1.85)*(4)/3.14}
= 1.53 inches
G:\Projects\Mercury_Development\Morrisville_01-062\ WORD\DWQ Express Review\Hydraulics\1-inch rain\Pond A.doc
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EXPRESS PERMIT REVIEW PROGRAM
Division of Water Quality
Department of Environmental and Natural Resources
Wetlands/401 Unit
Street Address: 2321 Crabtree Boulevard, Suite 250
Reing ,, NC 27604-2260
Mailing Address: 1650 Mail Service Center
Raleigh, NC 27699-1650
Contact Information: Phone d: 919-733-0203
Fax #: [phone]
Fax To: 1{cvin Martin Fax #: 919-846=9467
Subject: Providence Place/Morris Station Date: 712/04
Number of pages including cover sheet: 5
Notes or special instructions:
'I lit, original will be sent in the mail. if you have questions please call Debbie Edwards ar 919-733.9501
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fi Michael F. Easley, Governor
Q William G. Ross Jr., Secretary
North Carolina Department of Environment and Natural Resources
Alan W. Klimek, P.E., Director
y Division of Water Quality
Coleen H. Sullins, Deputy Director
Division of Water Quality
EXPRESS PERMIT REVIEW PROGRAM
Division of Water Quality
Department of Environmental and Natural Resources
Wetlands/401 Unit
Street Address: 2321 Crabtree Boulevard, Suite 250
Raleigh, NC 27604-2260
Mailing Address: 1650 Mail Service Center
Raleigh, NC 27699-1650
Contact Information: Phone #: [phone]
Fax #: [phone]
Fax To: Kevin Martin Fax #: [phone]
Subject: Providence Place/Morris Station Date: 7/2/04
Number of pages including cover sheet: 5
Notes or special instructions:
The original will be sent in the mail. If you have questions please call Debbie Edwards at 919-733-9502.
t?
N. C. Division of Water Quality, 401 Wetlands Certification Unit,
1650 Mail Service Center, Raleigh, NC 27699-1650 (Mailing Address)
2321 Crabtree Blvd., Raleigh, NC 27604-2260 (Location)
[phone] (phone), 919-733-6893 (fax), (http://h2o.enr.state.nc.us/newetlands

Providence Place
Rice & Associates Prol. #03-047
Date: April 22, 2004 (Revised June 29, 2004)
By: Cameron Rice, P.E. c u&o a,- , 0 1-
Stormwater Calculations for Pond "A"
Multi-Family Section "A" (MF-A)
Calculate the surface area for a wet detention pond
Wet Detention Pond Calculations (NCDENR's Stormwater BMP, April 1999)
Impervious Area = 30.0% (See Attachment "A2" for calculations)
Permanent pool depth = 4.5 feet
Average Pool Depth = 3.0 ft
Surface area/Drainage area ratio = 1.34 (From Table 1.1, copy attached)
Site area = 1 1.9 acres
SA/DA = 1.34
SA = (1.34/100)*(1 1.9 acres) = 0.159 acres = 6,926 sf
Volume to be Stored from the 1" Storm
Runoff Coefficient (Rv) = Storm runoff (in) / Storm rainfall (in)
Percent Impervious (1) = Drainage area (ac) / Impervious portion of DA (ac.)
Rv = 0.05 + .009 * (1)
= 0.05 + .009 * (30.0)
= 0.32 in/in
Vol. from 1" of Runoff = (Design rainfall) * (Rv) * (Drainage Area)
(1" ) * (0.32 in/in) * (11.9 ac.) * (lft/12in )* (43560 sf/ac.)
13,823 cf
Verify required surface area of pond
Area of permanent pool surface = 7,079 sf (normal water surface elevation, NSWE)
Area at NWSE > Required surface area
X079 sf > 6,926 sf
Verify required volume to cap ture 1" rainfall
Volume of permanent pool = 21,237 cf (normal water surface elevation, NSWE)
Elevation of permanent pool = 325
Volume of temporary pool = 14,000 cf
Elevation of temporary pool = 326.71
Volume provided > Volume Required
(,.I ,237 cf > 13,823 cf
G:\Projects\Mercury_Development\Morrisville_01 -062\_WORD\DWQ Express Review\Hydraulics\l -inch rain\Pond A.doc
,4' AIM
Providence Place
Rice & Associates Proj. #03-047
Calculate Average Depth
Average Depth = Volume Provided
Surface Area Provided
Average Depth = 21,237 cf
7,079 sf
Average Depth = 3.0 ft
Date: April 22, 2004 (Revised June 29, 2004)
By: Cameron Rice, P.E.
Volume to be Stored from the 1" Storm Calculate Diameter of Orifice
Temporary pool volume = 14,000 cf
Height of temporary pool = 1.71 feet
Drawdown time = 2 days or 172,800 seconds
Flowrate = 14,000 cf /172,800 sec = 0.081 cfs
Orifice Coefficient = 0.6
Area = (Q/C)/sgrt(2*G*H)
= (0.081 /0.6)/sgrt{(2)*(32.2)*(1.71)}
= 0.0129 sf
= 1.85 sq in
Diameter = sqrt(area* 4)/II
= sgrt{(1.85)*(4)/3.14}
= 1.53 inches
G:\Projects\Mercury_Development\Morrisville_01 -062\_WORD\DWQ Express Review\Hydraulics\l-inch rain\Pond A.doc
-. ,.411t
Project Name:
Project No. DWQ
pond A
SUBMITTED DESIGN.
elevations
Bottom of Basin (ft) 322
Permanent Pool (ft) 325
Temporary Pool (ft) 326.71

areas
Permanent Pool SA (sq ft) 7079
Drainage Area (ac) 11.9
Impervious Area (ac) 3.57

volumes
Permanent Pool (cu ft) 21327
Temporary Pool (cu ft) 14000
Forebay (cu ft) 2800
other parameters
SAIDA 1.34
Orifice Diameter (in) 1.53
Design Rainfall (in) 1
Linear Interpolation of Correct SAIDA***
0/0 impervious
Next Lowest 30
Project Impervious 30.0
Next Highest 40
REQUIRED DESIGN:
3.0 average depth status
3 ft. depth ok
1.71 ft. depth ok
6946 sq. ft. ok
6929 based on avg depth ok
-
30.0%
13823 cu. ft. ok
13.1 % check forebc
1.34 -
0.06 cfs drawdown -
2.9 day drawdown ok
3 ft. Permanent Pool Depth
SAIDA fron (Avg. Depth)
1.34 1.336694448 1.08
1.34I 1.03
1.73 1.72618511)()-, 1.43
3 ft 4

A `N
Michael F. Easley, Governor
William G. Ross Jr., Secretary
North Carolina Department of Environment and Natural Resources
y
llq?
Alan W. Klimek, P.E., Director
Division of Water Quality
Coleen H. Sullins, Deputy Director
Division of Water Quality
EXPRESS PERMIT REVIEW PROGRAM
Division of Water Quality
Department of Environmental and Natural Resources
Wetlands/401 Unit
Street Address: 2321 Crabtree Boulevard, Suite 250
Raleigh, NC 27604-2260
Mailing Address: 1650 Mail Service Center
Raleigh, NC 27699-1650
Contact Information: Phone #:
Fax #:
Fax To: Kevin Martin
Subject: Morris Station/Providence Place
Number of pages including cover sheet: 3
Notes or special instructions:
Fax #: [phone]
Date: 6/28/04
The original will be sent in the mail. If you have questions please call Debbie Edwards at 919-733-9502.
N. C. Division of Water Quality, 401 Wetlands Certification Unit,
1650 Mail Service Center, Raleigh, NC 27699-1650 (Mailing Address)
2321 Crabtree Blvd., Raleigh, NC 27604-2260 (Location)
[phone] (phone), 919-733-6893 (fax), (http://h2o.enr.state.nc.us/ncwetlands
919-733-0203
919-733-6893
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EXPRESS PERMIT REVIEW PROGRAM
Division of Water Quality
Department of Environmental and Natural Resources
Wetlands/401 Unit
Street Address: 2331 Crabtree Boulevard, Saito 250
Raleigh, N(27604-2260
Mailing Address: 1650 Mail Service Center
Raleigh, INC 27699-1650
Contact Information: Phone #, 919-733-0203
Pax #: 919-733-6893
Fax To: Kevin Martin Fax #: [phone]
Subject: Morris Station/Providence Place Date: 6128104
Number of pages including cover sheet: 3
Notes or special instructions:
The original will tie sent in the mail. If you have gUestions please call Debbie Edwards at 919-733-9502.
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Michael F. Easley, Governor
William G. Ross Jr., Secretary
North Carolina Department of Environment and Natural Resources
Alan W. Klimek, P. E. Director
Division of Water Quality
Coleen H. Sullins, Deputy Director
Division of Water Quality
June 25, 2004
CERTIFIED MAIL: RETURN RECEIPT REQUESTED
DWQ Project No. Exp. 04-0679
Wake County
Page 1 of 2
Mr. Cameron Rice, P.E.
Rice and Associates
978 Trinity Road - - - -
Raleigh, North Carolina 27607
Subject Property: Providence Place Subdivision, Town Home Section: Stormwater Management
REQUEST FOR MORE INFORMATION-EXPRESS REVIEW PROGRAM
Dear Mr. Rice:
On June 17, 2004, the Division of Water Quality (DWQ) received your letter dated June 17, 2004
regarding stormwater management needed to construct the proposed Providence Place Townhomes. The
DWQ has determined that your stormwater plan provided inaccurate information as discussed below. The
DWQ will require additional information in order to process your application to impact protected wetland,
streams and/or buffers on the subject property. Therefore, unless we receive the additional information
requested below, we will have to move toward denial of your application as required by 15A NCAC 2H
.0506 and 2B .0233(8) and will place this project on hold as incomplete until we receive this additional
information. Please provide the following information so that we may continue to review your project.
Additional Information:
1. Stormwater Detention Pond A
Your design currently has an average depth of 1.9 feet. We require a minimum average depth of 3 feet.
Your correspondence indicated that you are calculating volume based on the frustum of a pyramid or
cone. Measuring the height of the frustum gives you the maximum height, rather than the average
height. Similarly, your calculation of average depth is incorrect. Because it is a ratio, average depth is
calculated by using the volume divided by the surface area (SA). Therefore, please provide a
stormwater pond that meets the design criteria in DWQ's stormwater manual as described in our June
15, 2004 letter.
As we noted in our training sessions, your response time for the submittal of additional information is four
(4) days. Please respond by four (4) days of the date of this letter (noon on June 29, 2004) by sending
this information to me via e-mail or fax and a follow-up copy in writing. The Express Review Program is a
process that requires all parties to participate in a timely manner. Unless we receive a redesigned pond
that meets DWQ's design criteria within four (4) days of the date of this letter, we will be forced to reject
your application and you will be required to reapply either through our regular 401 Water Quality
Certification Program or the Express Review.
North Carolina Division of Water Quality, Wetlands/401 Unit,
1650 Mail Service Center, Raleigh, NC 27699-1650 (Mailing Address)
2321 Crabtree Blvd., Raleigh, NC 27604-2260 (Location)
919-733-1786 (phone), 919-733-6893 (fax), http://h2o.enr.state.nc.us/nowetlands/
Cameron Rice, P.E.
Page 2 of 2
6/25/04
This letter only addresses the application review and does not authorize any impacts to wetlands, waters
or protected buffers. Please be aware that any impacts requested within your application are not
authorized (at this time) by the DWQ. Please call Cynthia Van Der Wiele at [phone] or John
Dorney [phone] if you have any questions regarding this letter.
Sincerely
1?*
rtiands/401 ey,
W U it, D Q.
JRD/cvdw
cc: Craig Lang- Fortis/Westminister Homes, 3500 Regency Pkwy., Suite F, Cary, NC 27511
USACE Raleigh Regulatory Field Office
DWQ Raleigh Regional Office
File Copy
Central Files
Kevin Martin-S&EC

Cameron Rice, P.E.
Page 2 of 2
6/25/04
This letter only addresses the application review and does not authorize any impacts to wetlands, waters
or protected buffers. Please be aware that any impacts requested within your application are not
authorized (at this time) by the DWQ. Please call Cynthia Van Der Wiele at [phone] or John
Dorney [phone] if you have any questions regarding this letter.
JRD/cvdw
cc: Craig Lang-Fortis/Westminister Homes, 3500 Regency Pkwy., Suite F, Cary, NC 27511
USACE Raleigh Regulatory Field Office
DWQ Raleigh Regional Office
File Copy
Central Files
Kevin Martin-S&EC
Sincerely
Michael F. Easley, Governor
William G. Ross Jr., Secretary
North Carolina Department of Environment and Natural Resources
Alan W. Klimek, P.E., Director
Division of Water Quality
Coleen H. Sullins, Deputy Director
Division of Water Quality
Division of Water Quality
Department of Environmental and Natural Resources
Wetlands/401 Unit
Street Address: 2321 Crabtree Boulevard, Suite 250
Raleigh, NC 27604-2260
Mailing Address: 1650 Mail Service Center
Raleigh, NC 27699-1650
Contact Information: Phone #: [phone]
Fax #: [phone]
Fax To: Fax #:
Company: i--a2 ??l??U S Date:
/254?
Number of pages including cover sheet: -' 5
Notes or special

A4 % L/e-wo'

J
N. C. Division of Water Quality, 401 Wetlands Certification Unit,
1650 Mail Service Center, Raleigh, NC 27699-1650 (Mailing Address)
2321 Crabtree Blvd., Raleigh, NC 27604-2260 (Location)
[phone] (phone), 919-733-6893 (fax), (http://h2o.enr.state.nc.us/ncwetlands
I 'I ,
I&A
RICE &
ASSOCIATES
June 17, 2004
Division of Water Quality
401 /Wetlands Unit
1650 Mail Service Center
Raleigh, North Carolina 27699-1650
(copy emailed; original mailed)
Re: Providence Place Subdivision - Town Home Section
Morrisville, Wake County, North Carolina
DWQ Express Review Program: DWQ Project No.:
R&A Project No.: 03-047
Dear Ms. Van Der Wiele:
Stormwater Management
04-0679
Rice & Associates reviewed the revised DWQ calculations received on June 15, 2004, for Ponds "A",
"B", and "C" for the above referenced project. It is our position DWQ's methodology for checking our
pond surface areas does not accurately represent the method for designing Wet Detention Basins as
outlined in NCDENR's Stormwater Best Management Practices dated April 1999.
NCDENR'S outlined example on page 6 is specific in its procedure for determining the surface area
(SA). First, a SA/DA ratio (surface area/drainage area) is determined from Table 1.1 by knowing a
percentage of impervious area and a permanent pool depth. The SA/DA ratio is then used to determine
the required surface area.
Instead of DWQ calculating a SA/DA ratio their review calculations backed into the SA/DA ratio by
calculating an average depth. This depth was determined by the following equation:
Avg. Depth = Permanent Pool Volume (cf) = 10,000 cy = 2.0 ft
Permanent Pool Surface Area (sf) 5,000 sf
The average depth and impervious area percentage were used to determine a SA/DA ratio from Table
1.1. This new SA/DA ratio was then used to determine a new surface area.
It is our position that DWQ's procedure for determining a Permanent Pool Surface Area does not follow
NCDENR's Stormwater Best Management Practices example and the calculations are not mathematically
correct based on the following example calculation and explanation.
Permanent Pool Surface Area, (A,) = 5,000 sf
Bottom of Pool Area, (A2) = 1,910 sf
Permanent Pool Volume, (V) = 10,000 sf
978 Trinity Road • Raleigh, North Carolina 27607 • Voice 919.854.0811 • Fax [phone] • Email: [e-mail]
Providence Place Subdivision - Town Home Section: Stormwater Management
Morrisville, Wake County, North Carolina
DWQ Express Review Program: DWQ Project No.: 04-0679
R&A Project No.: 03-047
June 17, 2004
Volume of a Frustrum of Pyramid or Cone (') = 1/3 fA, + A2 + Sgrt(A,*A2)}*h
The equation has been rearranged to solved for depth, h
h = 3*V = 3* 10,000 = 3.0 ft
fA, + A2 + Sgrt(A,*A2)1 {5,000 + 1,901 + Sgrt(1,901 *5,0001
Quantitatively, one can conclude for a pond of this size or larger that a difference in depth of at
least one foot will exist every time. The reason is because DWQ assumes the pond has vertical
sidewalls when it calculates the average depth. Our calculations are consistent for a pond with
3:1 side slopes and its geometry closely resembles a Frustum of Pyramid or Cone. This
accepted formula for a Frustum of Pyramid or Cone has been attached for your use(').
We will be more than glad to discuss the above calculations. Please contact us at your earliest
convenience. You can contact us [phone], extension 105.
Very truly yours,
RICE & ASSOCIATES

Cameron Rice, P.E.
cc: John R. Dorney, DWQ's 401 Wetlands Unit
Craig Lang, Fortis Westminster
Kevin Martin, S & EC
(1) Burington, Ph.D, R. S. (1965). Handbook of Mathematical Tables and Formulas. New York: McGraw-Hill Book Company
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imap://debbie.edwards%40dwq.denr.ncmail. net @ cros.ncmail. net:143/...
Subject: Providence Place Subdivision: DWQ Proj. # 04-0679, Wake County
From: "Cameron Rice" <[e-mail]>
Date: Thu, 17 Jun 2004 09:16:31 -0400
To: <[e-mail]>
CC: "Steve Rice" <[e-mail]>, "Fred Rash" <[e-mail]>,
<[e-mail]>, <[e-mail]>, <[e-mail]>
Ms. VanDer Wiele,
Attached is our response to your revised calculations received on June 15, 2004. Please call me if you
have any questions or comments.
Cameron M. Rice, P.E.
RICE & ASSOCIATES
978 Trinity Road
Raleigh, North Carolina 27607
Phone: [phone] (ext. 105)
Fax: [phone]
Mobile: [phone]
Email: cmr@ riceassociates. net
1 of 1 6/17/2004 1:45 PM
WETLANDS/ 401 GROUP
11 1
I&A
RICE &
ASSOCIATES
JUN 1 8 2004
WATER QUALITY SECTION
June 17, 2004
Division of Water Quality
401 /Wetlands Unit
1650 Mail Service Center
Raleigh, North Carolina 27699-1650
(copy emailed; original mailed)
Re: Providence Place Subdivision -Town Home Section
Morrisville, Wake County, North Carolina
DWQ Express Review Program: DWQ Project No.:
R&A Project No.: 03-047
Stormwater Management
04-0679
Dear Ms. Van Der,Wiele:
Rice & Associates reviewed the`revised'DWQ calculations received on June 15, 2004, for Ponds "A",
"B", and "C" for the above referenced project. It is our position DWQ's methodology for checking our
pond surface "areas does not accurately. represent the method for designing Wet Detention Basins as
outlined in NCDENR's Stormwater Best Management Practices dated April 1999.
NCDENR'S outlined "example on page 6 is specific in its procedure for determining the surface area
(SA). First, a SA/DA ratio (surface area/drainage area) is determined from Table 1.1 by knowing a
percentage of impervious area and a permanent pool depth. The SA/DA ratio is then used to determine
the required surface area.
Instead of DWQ calculating a SA/DA ratio their review calculations backed into the SA/DA ratio by
calculating an average depth. This depth was determined by the following equation:
Avg. Depth = Permanent Pool Volume (cf) = 10,000 cy = 2.0 ft
Permanent Pool Surface Area (sf) 5,000 sf
The average depth and impervious area percentage were used to determine a SA/DA ratio from Table
1.1. This new SA/DA ratio was then used to determine a new surface area.
It is our position that DWQ's procedure for determining a Permanent Pool Surface Area does not follow
NCDENR's Stormwater Best Management Practices example and the calculations are not mathematically
correct based on the following example calculation and explanation.
Permanent Pool Surface Area, (A,) = 5,000sf
Bottom of Pool Area, (A2) = 1,910 sf"
Permanent Pool' Volume, M = 10,000 sf
978 Trinity. Road • Raleigh, North Carolina 27607 • Voice 919.854.0811 • Fax [phone] • Email: [e-mail]
Providence Place Subdivision - Town Home Section: Stormwater Management
Morrisville, Wake County, North Carolina
DWQ Express Review Program: DWQ Project No.: 04-0679
R&A Project No.: 03-047
June 17, 2004
Volume of a Frustrum of Pyramid or Cone (') = 1 /3{A, + A2 + Sgrt(A,*A2)1*h
The equation has been rearranged to solved for depth, h
h = 3*V = 3*10,000 =
{A, + A2 + Sgrt(A, *A2)} {5,000 + 1,901 + Sgrt(1,901 *5,0001
3.0 ft
Quantitatively, one can conclude for a pond of this size or larger that a difference in depth of at
least one foot will exist every time. The reason is because DWQ assumes the pond has vertical
sidewalls when it calculates the average depth. Our calculations are consistent for a pond with
3:1 side slopes and its geometry closely resembles a Frustum of Pyramid or Cone. This
accepted formula for a Frustum of Pyramid or Cone has been attached for your use(').
We will be more than glad to discuss the above calculations. Please contact us at your earliest
convenience. You can contact us [phone], extension 105.
Very truly yours,
RICE & ASSOCIATES

Cameron Rice, P.E.
cc: John R. Dorney, DWQ's 401 Wetlands Unit
Craig Lang, Fortis Westminster
Kevin Martin, S & EC
(1) Burington, Ph.D, R. S. (1965). Handbook of Mathematical Tables and Formulas. New York: McGraw-Hill Book Company
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KILL &
ASSOCIATES
WETLANDS 1401 GROUP
JUN Y 7 2004
WATER QUALITY SECTION
June 15, 2004
Division of Water Quality
401 /Wetlands Unit
1650 Mail Service Center
Raleigh, North Carolina 27699-1650
ATTN: Mr. John Dorney, Supervisor
(copy faxed; original mailed)
Re: Providence Place Subdivision - Town Home Section
Providence Place Subdivision - Amenity Site
Morrisville, Wake County, North Carolina
DWQ Express Review Program: DWQ Project No.:
R&A Project No.: 03-047
Dear. Mr. Dorney:
Stormwater Management
04-0679
Rice & Associates is responding to the comment letter sent from the North Carolina Division of
Water Quality (DWQ) to Craig Lang, dated June 10, 2004 regarding the application dated
June 2, 2004 for the above-referenced project. After review of your comments, we understand
that some of the calculations we provided differ from the calculations determined by DWQ.
Rice & Associates would like to meet with you or your staff for more clarification about the
requested calculation revisions. We placed phone calls and sent e-mails to both Cynthia Van
der Wiele and Debbie Edwards per your request; however we have been unable to establish
contact. Please contact us at your earliest convenience so that we can set up a meeting to
discuss this project further.
You can contact us [phone], extension 105:
Very truly yours,
RICE & ASSOCIATES
r4k?? -? Y 6.0---
Cameron Rice, P.E.
cc: Craig Lang, Fortis Westminster
Kevin Martin, S & EC
978 Trinity Road • Raleigh, North Carolina 27607 • Voice 919.854.0811 • Fax [phone] • Email: [e-mail]
JUN-15-2004 08:44 AM Rice & Associates 9198540812 P.01
e
RICE &
ASSOCIATES
June 15, 2004
X
Division of Water Quality
401 /Wetlands Unit
1650 Mail Service Center
Raleigh, North Carolina 27699-1650
ATTN: Mr. John Dorney, Supervisor
(copy foxed; original mailed)
Re. Providence Place Subdivision - Town Home Section: Stormwater Management
Providence Place Subdivision --Amenity Site
Morrisville, Woke County, North Carolina
DWQ Express Review Program; DWQ Project No.: 04-0679
R&A Project No.: 03-047
Dear Mr. Dorney;
Rice & Associates is responding to the comment letter sent from the North Carolina Division of
Water Quality (DWQ) to Craig Lang, doted June 10, 2004 regarding the application dated
June 2, 2004 for the above-referenced project, After review of your comments, we understand
thot some of the calculations we provided differ from the calculations determined by DWQ.
Rice & Associates would like to meet with you or your staff for more clarification about the
requested calculation revisions. We placed phone coils and sent a-mails to both Cynthia Van
der Wiele and Debbie Edwards per your request; however we have been unable to establish
contact. Please contact us at your earliest convenience so that we can set up a meeting to
discuss this project further.
You can contact us (919) 854-0$11, extension 105.
Very truly yours,
RICE & ASSOCIATES

Cameron Rice, P.E,
cc: Croig Lang, Fortis Westminster
Kevin Martin, S & EC
978 Trinity Road - Raleigh, North Carolina 11601 • Voice 919.854.0811 - Fax 919,854.0812 • Email: [e-mail]
JUN-15-2004 TUE 07:31 TEL:[phone] NAME:DWQ-WETLANDS P. 1
4
imap://debbie.edwards%40dwq.denr.ncmail.net Ccbcros.ncmail.net:143/...
Subject: Re: Providence Place Subdivision (formerly Morris Station): DWQ Proj. # 04-0679, Wake
County
From: "Cynthia F. Van Der Wiele" <[e-mail]>
Date: Tue, 15 Jun 2004 12:00:45 -0400
To: Cameron Rice <[e-mail]>
CC: [e-mail],[e-mail]
Cameron,
I have re-checked the calculations. They are attached as excel spreadsheets.
Pond A still seems a little small; Pond B has forebay issues and Pond C is just fine.
Hopefully, attached as a spreadsheet with the formulas included, you can see where we're coming from.
Cynthia
Cameron Rice wrote:
DWQ's Wetlands Unit;
The above referenced project is currently under express review. We received comments dated June
10, 2004 and must respond by today. A follow-up copy in writing will be faxed to you this morning.
Before we can revise the calculations we need to schedule a meeting to discuss the correct method
for calculating SA/DA ratios because the calculations we provided differ from DWQ's. We are available
to meet at anytime.
Cameron M. Rice, P.E.
RICE & ASSOCIATES
978 Trinity Road
Raleigh, North Carolina 27607
Phone: [phone] (ext. 105)
Fax: [phone]
Mobile: [phone]
Email: [e-mail]
1 of 1 6/17/2004 8:56 AM

4
Project Name:
Project No. DWQ
pond A
SUBMITTED DESIGN:
elevations
Bottom of Basin (ft) 322
Permanent Pool (ft) 325
Temporary Pool (ft) 326.71
areas
Permanent Pool SA (sq ft) 7079
Drainage Area (ac) 11.9
Impervious Area (ac) 3.57
volumes
Permanent Pool (cu ft) 13417
Temporary Pool (cu ft) 14000
Forebay (cu ft) 2800
other parameters
SA/DA 1.34
Orifice Diameter (in) 1.53
Design Rainfall (in) 1
Linear Interpolation of Correct SAIDA ***
% Im ervious
Next Lowest 30
Project Impervious 30.0
Next Highest 40
REQUIRED DESIGN:
1.1) average depth status
3 ft. depth ok
1.71 ft. depth ok
6946 sq. ft. ok
5-4'5 based on avg depth check surfac
-
30.0%
13823 cu. ft. ok
20.9% ok
1.34 -
0.06 cfs drawdown -
2.9 day drawdown ok
3 ft. Permanent Pool Depth
SA/DA fron (Avg. Depth)
1.34 1.62721570£ 1. 0S
1.34 1.63 1.US
1.73 2.061402741 1.4-)'
3 Ft 4
t
Project Name:
Project No. DWQ
Pond B
SUBMITTED DESIGN:
elevations
Bottom of Basin (ft) 326
Permanent Pool (ft) 329
Temporary Pool (ft) 330.23

areas
Permanent Pool SA (sq ft)
5199
Drainage Area (ac) 8.5
Impervious Area (ac) 2.5

volumes
Permanent Pool (cu ft) 9037
Temporary Pool (cu ft) 9800
Forebay (cu ft) 2058
other parameters
SA/DA 1.34
Orifice Diameter (in) 1.39
Design Rainfall (in) 1
Linear Interpolation of Correct SAIDA***
% Im ervious
Next Lowest 20
Project Impervious 29.4
Next Highest 30
REQUIRED DESIGN.
1.7 average depth status
3 ft. depth ok
1.23 ft. depth ok
4881 sq. ft. ok
4455 based on avg depth ok
29.4%
-
9710 cu. ft. ok
22.8 % check forebc
1.32 -
0.04 cfs drawdown -
2.9 day drawdown ok
3 ft. Permanent Pool Depth
SA/DA fron (Avg. Depth)
0.97 0.831204078 1.0S
1.32 ,1.20! 1.41.
1.34 1.2204397 1.43
3 ft 4
10
Project Name:
Project No. DWQ
pond A
SUBMITTED DESIGN:
elevations
Bottom of Basin (ft) 316.5
Permanent Pool (ft) 319.5
Temporary Pool (ft) 320.7

areas
Permanent Pool SA (sq ft) 5675
Drainage Area (ac) 6.8
Impervious Area (ac) 1.97

volumes
Permanent Pool (cu ft) 9020
Temporary Pool (cu ft) 7800
Forebay (cu ft) 1677
other parameters
SA/DA 1.34
Orifice Diameter (in) 1.2.5
Design Rainfall (in) 1
Linear Interpolation of Correct SAIDA"*
% Im ervious
Next Lowest 20
Project Impervious 29.0
Next Highest 30
REQUIRED DESIGN:
I.6 average depth status
3 ft. depth ok
1.2 ft. depth ok
3856 sq. ft. ok
3472 based on avg depth ok
-
29.0%
7670 cu. ft. ok
18.6 % ok
1.30 -
0.03 cfs drawdown -
2.8 day drawdown ok
3 ft. Permanent Pool Depth
SA/DA fron (Avg. Depth)
0.97 0.814837004 1.08
1.30 1.17 1.37
1.34 1.2130484 5 1.4,?
3ft 4
imap://debbie.edwards%40dwq.denr.ncmail.net @cros.ncmail.net:143/...
Subject: Re: Providence Place Subdivision (formerly Morris Station): DWQ Proj. # 04-0679, Wake
County
From: "Cynthia F. Van Der Wiele" <[e-mail]>
Date: Tue, 15 Jun 2004 12:07:21 -0400
To: [e-mail], [e-mail]
Hey, got a connection at the Cary Public Library! But only for a half hour...
Just wanted to let you know that I called Todd St. John to discuss his spreadsheet ...I found a few places
where I went wrong, but the detention ponds still had some issues. So, I re-did the calculations and
called Cameron Rice to discuss over phone ...faster than scheduling a meeting ...I've emailed the
spreadsheets and cc'd. you guys. After he mulls them over and checks his calcs again, I suspect he'll call
me back ...I have DWQ cell phone on hand for that.
Cynthia
Cameron Rice wrote:
Cynthia & Debbie,
As a follow up to my voice mail message I left today, we received DWQ comments dated June 10,
2004, for the above referenced subdivision today. We would like to schedule a meeting to discuss a
few of the comments. Please call me with your available times.
Cameron M. Rice, P.E.
RICE & ASSOCIATES
978 Trinity Road
Raleigh, North Carolina 27607
Phone: [phone] (ext. 105)
Fax: [phone]
Mobile: [phone]
Email: [e-mail]
1 of 1 6/17/2004 8:56 AM
imap:Hdebbie. edwards %40dwq.denr.ncmail.net @ cros.ncmail.net:143/...
Subject: RE: Providence Place Subdivision (formerly Morris Station): DWQ Proj. # 04-0679, Wake
County
From: "Kevin Martin" <[e-mail]>
Date: Wed, 16 Jun 2004 11:25:05 -0400
To: "Cameron Rice" <[e-mail]>, <[e-mail]>,
<[e-mail]>, <[e-mail]>
CC: "Steve Rice" <[e-mail]>, "Fred Rash" <[e-mail]>,
<CLang @ KHOV.com>
I spoke with Debbie Edwards today and she confirmed that all you need to do is respond by the deadline,
that response can be a request for a meeting. She indicated that Cynthia would need to meet with you to
discuss the stormwater issues but believed that based on conversations you have already had with DWQ
most issues have been resolved and only a few remain.lf you have not Please send a written response
similar to your email for their files. Last I heard they did not consider email to be adequate. Fax and mail it
their fax is733-6893. Kevin
-----Original Message-----
From: Cameron Rice [mailto:[e-mail]]
Sent: Tuesday, June 15, 2004 8:56 AM
To: [e-mail]; [e-mail]; [e-mail]
Cc: Steve Rice; Fred Rash; [e-mail]; [e-mail]
Subject: Providence Place Subdivision (formerly Morris Station): DWQ Proj. # 04-0679, Wake
County
DWQ's Wetlands Unit;
The above referenced project is currently under express review. We received comments dated
June 10, 2004 and must respond by today. A follow-up copy in writing will be faxed to you this
morning. Before we can revise the calculations we need to schedule a meeting to discuss
the correct method for calculating SA/DA ratios because the calculations we provided differ from
DWQ's. We are available to meet at anytime.
Cameron M. Rice, P.E.
RICE & ASSOCIATES
978 Trinity Road
Raleigh, North Carolina 27607
Phone: [phone] (ext. 105)
Fax: [phone]
Mobile: [phone]
Email: [e-mail]
1 of 1 6/17/2004 8:56 AM
imap://debbie.edwards%40dwq.denr.ncmail.net @cros.ncmail.net:143/...
Subject: RE: Providence Place Subdivision (formerly Morris Station): DWQ Proj. # 04-0679, Wake
County
From: "Cameron Rice" <[e-mail]>
Date: Wed, 16 Jun 2004 11:36:19 -0400
To: "Kevin Martin" <[e-mail]>, <[e-mail]>,
<[e-mail]>, <[e-mail]>
CC: "Steve Rice" <[e-mail]>, "Fred Rash" <[e-mail]>,
<[e-mail]>
KM,
We provided a formal response via fax yesterday and also mailed the original. We received revised DWQ
calculations yesterday and are in the process of responding to them today. Attached is a copy of the email
I received from DWQ.
CR
From: Kevin Martin [mailto:[e-mail]]
Sent: Wednesday, June 16, 2004 11:30 AM
To: Cameron Rice; [e-mail]; [e-mail];
[e-mail]
Cc: Steve Rice; Fred Rash; [e-mail]
Subject: RE: Providence Place Subdivision (formerly Morris Station): DWQ Proj. # 04-0679, Wake County
I spoke with Debbie Edwards today and she confirmed that all you need to do is respond by the deadline,
that response can be a request for a meeting. She indicated that Cynthia would need to meet with you to
discuss the stormwater issues but believed that based on conversations you have already had with DWQ
most issues have been resolved and only a few remain.lf you have not Please send a written response
similar to your email for their files. Last I heard they did not consider email to be adequate. Fax and mail it
their fax is733-6893. Kevin
-----Original Message-----
From: Cameron Rice [mailto:[e-mail]]
Sent: Tuesday, June 15, 2004 8:56 AM
To: [e-mail]; [e-mail]; [e-mail]
Cc: Steve Rice; Fred Rash; [e-mail]; [e-mail]
Subject: Providence Place Subdivision (formerly Morris Station): DWQ Proj. # 04-0679, Wake
County
DWQ's Wetlands Unit;
The above referenced project is currently under express review. We received comments dated
June 10, 2004 and must respond by today. A follow-up copy in writing will be faxed to you this
morning. Before we can revise the calculations we need to schedule a meeting to discuss
the correct method for calculating SA/DA ratios because the calculations we provided differ from
DWQ's. We are available to meet at anytime.
Cameron M. Rice, P.E.
RICE & ASSOCIATES
978 Trinity Road
Raleigh, North Carolina 27607
1 of 2 6/17/2004 8:56 AM
imap://debbie.edwards%40dwq.denr.ncmail.net @cros.ncmail.net:143/...
Phone: [phone] (ext. 105)
Fax: [phone]
Mobile: [phone]
Email: [e-mail]
Cameron,
I have re-checked the calculations. They are attached as excel spreadsheets.
Pond A still seems a little small; Pond B has forebay issues and Pond C is just fine.
Hopefully, attached as a spreadsheet with the formulas included, you can see where we're coming from.
Cynthia
Cameron Rice wrote:
DWQ's Wetlands Unit;
The above referenced project is currently under express review. We received comments dated June
10, 2004 and must respond by today. A follow-up copy in writing will be faxed to you this morning.
Before we can revise the calculations we need to schedule a meeting to discuss the correct method
for calculating SA/DA ratios because the calculations we provided differ from DWQ's. We are available
to meet at anytime.
Cameron M. Rice, P.E.
RICE & ASSOCIATES
978 Trinity Road
Raleigh, North Carolina 27607
Phone: [phone] (ext. 105)
Fax: [phone]
Mobile: [phone]
Email: [e-mail]
2 of 2 6/17/2004 8:56 AM
f
0
wAT??
Q?
rte..
=1
Alan W. Klimek, P.E., Director
Division of Water Quality
June 10, 2004
CERTIFIED MAIL: RETURN RECEIPT REQUESTED
Fortis/Westminister Homes
Attn: Craig Lang
3500 Regency Pkwy., Suite F
Cary, NC 27511
Subjects: Morris Station Subdivision-Town Home Section: Stormwater Management
Providence Place-Amenity Site (formerly Morris Station Subdivision)
DWQ Express Review Program
Dear Mr. Lang:
DWQ Project No. 04-0679
Wake County
Page 1 of 4
On June 3, 2004, the Division of Water Quality (DWQ) received your application dated June 2, 2004, to impact 0.09 acres
of wetlands and 279 feet of stream to construct the proposed Morris Station Subdivision. After the initial review of your
project and the stormwater management plans, further information will be necessary for the Morris Station Subdivision to
receive final approval. The additional information is as follows:
Wet Detention Pond A
Our calculations indicate that the Permanent Pool surface area may not be sized correctly.
SUBMITTED DESIGN. Pond A REQUIRED DESIGN.
elevations average depth
Bottom of Basin (ft) M67 Permanent Pool (ft) 3ft. depth
Temporary Pool (ft) 321.71 ft. depth
areas
Permanent Pool SA (sq ft) 7079 18402 sq. ft.
Drainage Area (ac) 11.9 n2 based on avg depth
Impervious Area (ac) 3.57 + 30.0%
volumes
Permanent Pool (cu ft) 13417
Temporary Pool (cu ft) 14000 13823 cu. ft.
Forebay (cu ft) 2800 20.9%
other parameters
SA/DA 1.34 3.55
Orifice Diameter (in) 1.53 0.06 cfs drawdown
Design Rainfall (in)_ 1 2.9 day drawdown
Michael F. Easley
Governor
William G. Ross, Jr., Secretary
Department of Environment and Natural Resources
status
ok
ok
check surface area
check surface area
-0.0128018
ok
ok
- eq diameter
- 3.535534
ok
area
9.8175
North Carolina Division of Water Quality, 401 Wetlands Certification Unit,
1650 Mail Service Center, Raleigh, NC 27699-1650 (Mailing Address)
2321 Crabtree Blvd., Raleigh, NC 27604-2260 (Location)
919-733-1786 (phone), 919-733-6893 (fax), http://h2o.enr.state.nc.us/ncwetlands/
Mr. Craig Lang
June 10, 2004
Page 2 of 2
Wet Detention Pond B
Our calculations show the following deficiencies:
¦ The Permanent Pool surface area may not be adequate.
¦ Forebay will need to be resized.
SUBMITTED DESIGN. Pond B
elevations
Bottom of Basin (ft) 326
Permanent Pool (ft) 329
Temporary Pool (ft) 330.23
areas
Permanent Pool SA (sq ft) 5199
Drainage Area (ac) 8.5
Impervious Area (ac) 2.5
volumes
Permanent Pool (cu ft) 9037
Temporary Pool (cu ft) 9800
Forebay (cu ft) 2058
other parameters
SA/DA 1.34
Orifice Diameter (in) 1.39
Design Rainfall (in) 1
REQUIRED DESIGN.
average depth status
3 ft. depth ok
1.23 ft. depth ok
13765. sq. ft. check surface area
based on avg depth check surface area
-
29.4%,
-0.0092428
9710 cu. ft.
22.8%
3.72
0.04 cfs drawdown
2.9 day drawdown
ok
check forebay
eq diameter
3.535534
ok
area
9.8175
Linear Interpolation of Correct SAIDA"*
% Impervious
-Next Lowest -- ---- 20
Project Impervious 29.4
Next Highest 30
3ft. Permanent Pool Depth
SA/DA from Table (Avg. Depth)
3.36 4.571309867 2=
3.72 3 2.76
3.74 4.951309867 2.7
,eft
r 4'ft
2
Mr. Craig Lang
June 10, 2004
Page 2 of 2
Wet Detention Pond C
Based on our calculations, the following will need to be re-examined:
¦ Surface area of the Permanent Pool.
SUBMITTED DESIGN. Pond C
elevations
Bottom of Basin (ft) 316.5
Permanent Pool (ft) 319.5
Temporary Pool (ft) 320.7
areas
Permanent Pool SA (sq ft) 5675
Drainage Area (ac) 6.8
Imperious Area (ac) 1.97
volumes
Permanent Pool (cu ft) 9020
Temporary Pool (cu ft) 7800
Forebay (cu ft) 1677
REQUIRED DESIGN.
average depth status
3 ft. depth ok
1.2 ft. depth ok
10962 sq. ft. check surface area
00 based on avg depth check surface area
29.0,% -
-0.016924
7670 cu. ft. ok
18.6% ok
other parameters
SA/DA 1.34 3.70 - eq diameter
Orifice Diameter (in) 1.25 0.03 cfs drawdown - 3.535534
Design Rainfall (in) 1 2.8 day drawdown ok
area
9.8175
Linear Interpolation of Correct SAIDA***
3 ft. Permanent Pool Depth
% Impervious SA/DA from Table (Avg. Depth)
Next Lowest 20 3.36 4.71414978 ° ' 24
Project_lmperious _ 29.0 3.70 2.74
t2?78
Next Highest 30 3.74 5.09414978_''-"
j ft? ft
Providence Place Amenity Site (formerly Morris Station Subdivision)
3
The DWQ staff has also reviewed the five (5) grassed swale designs as included in the supplemental information for the
Town Home section in the above-referenced subdivision. The DWQ is satisfied that the designs provided will pre-treat the
stormwater runoff generated from the Amenity Site prior to entering the single-family stormwater ponds.
Mr. Craig Lang
June 10, 2004
Page 2 of 2
You are reminded that stormwater management plans must meet or exceed the all of the design requirements specified.
This condition will be part of the requirements of the §401 Water Quality Certification unless more stringent requirements
are in effect from other state water quality programs. Therefore,
• The facilities must be designed to treat the runoff from the entire project, unless otherwise explicitly approved by the
Division of Water Quality.
• Before any permanent building or other structure is occupied at the subject site, the facilities (as approved by the
Wetlands Unit) shall be constructed and operational, and the stormwater management plan (as approved by the
Wetlands Unit) shall be implemented.
• The structural stormwater practices as approved by the Wetlands Unit as well as drainage patterns must be
maintained in perpetuity.
• No changes to the structural stormwater practices shall be made without written authorization from the Division of
Water Quality.
4
Please respond within three days of the date of this letter by sending this information to me via e-mail or fax and a follow-up
copy in writing. The Express Review Program is a process that requires all parties to participate in a timely manner. If the
DWQ feels the Express Review Program is the incorrect review program for your project, then we may have to return your
application and have it reviewed through our regular 401 Water Quality Certification Program.
This letter only addresses the application review and does not authorize any impacts to wetlands, waters or protected
buffers. Please be aware that any impacts requested within your application are not authorized (at this time) by the DWQ.
Please call Ms. Deborah Edwards at [phone] or Ms. Cynthia Van, Der Wiele at [phone] if you have any
questions regarding or would like to set up a meeting to discuss this mattgr.
cc: Steve Mitchell, DWQ Raleigh Regional Office
USACE Raleigh Regulatory Field Office
Kevin Martin, S& EC
Steve Rice-Rice & Associates, 978 Trinity Road, Raleigh, NC 27607
File copy
Central Files
SENDING CONFIRMATION
DATE . JUN-11-2004 FRI 07:33
NAME DWQ-WETLANDS
TEL [phone]
PHONE : [phone]
PAGES : 5/5
START TIME : JUN-11 07'•32
ELAPSED TIME : 01,001,
MODE : ECM
RESULTS : OK
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Fax To: Ke-v .1 ------9467
Subject: Mol
Number of pagi - - - -- -- - ?1- ?t'1 ?_ G? _
Notes or special- -- -- -- - - -`?` - -
- - - -- 1-- - ?/ ?ti- ;?- - -
The original will b( )-733-9502.
?S
7-S -S
IAK - 4V
N. C. Division of Watt
1650 Mail Service Cen.,,,,..-.,,y,_r_,.-_, ,ess)
2321 Crabtree Blvd., Raleigh, NC 27604-2260 (L)cation)
[phone] (phone), 919-733-6893 (fax), (http://h2o.enr.state.nc.us/ncwetlands
Michael F. Easley, Governor
William G. Ross Jr., Secretary
North Carolina Department of Environment and Natural Resources
Alan W. Klimek, P.E., Director
Division of Water Quality
Coleen H. Sullins, Deputy Director
Division of Water Quality
T2ElE-r,
Michael F. Easley
Governor
William G. Ross, Jr., Secretary
Department of Environment and Natural Resources
Alan W. Klimek, P.E., Director
Division of Water Quality
June 10, 2004
DWQ Project No. 040084 and Express 040679
Morris Station Subdivision
Wake County
Mr. Steven M. Rice, P.E.
Rice & Associates
978 Trinity Road
Raleigh, NC 27607
Subjects: Morris Station Subdivision-Town Home Section: Stormwater Management
Providence Place-Amenity Site (formerly Morris Station Subdivision)
Dear Mr. Rice:
The Wetlands Unit staff has reviewed the stormwater management plans. In order to receive
final approval, further information will be necessary for the Morris Station Subdivision-Town
Homes Section. The additional information is as follows:
Wet Detention Pond A
Our calculations indicate that the Permanent Pool surface area may not be sized correctly.
SUBMITTED DESIGN: Pond A REQUIRED DESIGN:
elevations 1.9 average depth status
Bottom of Basin (ft) 322
Permanent Pool (ft) 325 3 ft. depth ok
Temporary Pool (ft) 326.71 1.71 ft. depth ok
areas
Permanent Pool SA (sq ft) 7079 18402 sq. ft. check surface area
Drainage Area (ac) 11.9 3899 based on avg depth check surface area
-
Impervious Area (ac) 3.57 30.0%
volumes
Permanent Pool (cu ft) 13417 -0.0128018
Temporary Pool (cu ft) 14000 13823 cu. ft. ok
Forebay (cu ft) 2800 20.9% ok
other parameters
SA/DA 1.34 3.55 - eq diameter
Orifice Diameter (in) 1.53 0.06 cfs drawdown - 3.535534
Design Rainfall (in) 1 2.9 day drawdown ok
area
9.8175
North Carolina Division of Water Quality, 401 Wetlands Certification Unit,
1650 Mail Service Center, Raleigh, NC 27699-1650 (Mailing Address)
2321 Crabtree Blvd., Raleigh, NC 27604-2260 (Location)
919-733-1786 (phone), 919-733-6893 (fax), hftp://h2o.enr.state.nc.us/ncwetlands/
Mr. Steven M. Rice, P.E.
Morris Station Subdivision
June 10, 2004
Wet Detention Pond B
Our calculations show the following deficiencies:
¦ The Permanent Pool surface area may not be adequate.
¦ Forebay will need to be resized.
SUBMITTED DESIGN. Pond B REQUIRED DESIGN:
elevations 1.7 average depth status
Bottom of Basin (ft) 326
Permanent Pool (ft) 329 3 ft. depth ok
Temporary Pool (ft) 330.23 1.23 ft. depth ok
areas
Permanent Pool SA (sq ft) 5199 13765 sq. ft. check surface area
Drainage Area (ac) 8.5 18250 based on avg depth check surface area
Impervious Area (ac) 2.5 29.4%
-
volumes
Permanent Pool (cu ft) 9037
Temporary Pool (cu ft) 9800 9710cu. ft.
Forebay (cu ft) 2058 22.8%
other parameters
2
-0.0092428
ok
checkforebay
SA/DA 1.34 3.72 -
Orifice Diameter (in) 1.39 0.04 cfs drawdown -
Design Rainfall (in) 1 2.9 day drawdown ok
eq diameter
3.535534
area
9.8175
Linear Interpolation of Correct SAIDA***
% Impervious
Next Lowest 20
Project Impervious 29.4
Next Highest 30
3 ft. Permanent Pool Depth
SA/DA from Table (Avg. Depth)
3.36 4.571309867
3.72 4.93
3.74 4.951309867
3 ft
2.4
2.76
2.78
4 ft
Mr. Steven M. Rice, P.E.
Morris Station Subdivision
June 10, 2004
Wet Detention Pond C
Based on our calculations, the following will need to be re-examined:
¦ Surface area of the Permanent Pool.
SUBMITTED DESIGN: Pond C
REQUIRED DESIGN:
elevations I.( average depth status
Bottom of Basin (ft) 316.5
Permanent Pool (ft) 319.5 3 ft. depth ok
Temporary Pool (ft) 320.7 1.2 ft. depth ok
areas
Permanent Pool SA (sq ft) 5675
Drainage Area (ac) 6.8
Impervious Area (ac) 1.97
volumes
Permanent Pool (cu ft) 9020
Temporary Pool (cu ft) 7800
Forebay (cu ft) 1677
other parameters
SA/DA 1.34
Orifice Diameter (in) 1.25
Design Rainfall (in) 1
10962 sq. ft. check surface area
14973 based on avg depth check surface area
-
29.0%
7670 cu. ft. ok
18.6% ok
3
-0.016924
3.70 - eq diameter
0.03 cfs drawdown - 3.535534
2.8 day drawdown ok
area
9.8175
Linear Interpolation of Correct SAIDA***
% Impervious
Next Lowest 20
Project Impervious 29.0
Next Highest 30
3 ft. Permanent Pool Depth
SA/DA from Table (Avg. Depth)
3.36 4.71414978 4
3.70 5.06 2.74
3.7?4 5.0941497,,' 2. 7,5
ft
4 ft
Providence Place Amenity Site (formerly Morris Station Subdivision)
The Wetlands Unit staff has also reviewed the five (5) grassed swale designs as included in the
supplemental information for the Town Home section in the above-referenced subdivision. The
Wetlands Unit is satisfied that the designs provided will pre-treat the stormwater runoff
generated from the Amenity Site prior to entering the single-family stormwater ponds.
Mr. Steven M. Rice, P.E.
Morris Station Subdivision
June 10, 2004
4
You are reminded that stormwater management plans must meet or exceed the all of the design
requirements specified. This condition will be part of the requirements of the §401 Water
Quality Certification unless more stringent requirements are in effect from other state water
quality programs. Therefore,
• The facilities must be designed to treat the runoff from the entire project, unless otherwise
explicitly approved by the Division of Water Quality.
• Before any permanent building or other structure is occupied at the subject site, the facilities
(as approved by the Wetlands Unit) shall be constructed and operational, and the
stormwater management plan (as approved by the Wetlands Unit) shall be implemented.
• The structural stormwater practices as approved by the Wetlands Unit as well as drainage
patterns must be maintained in perpetuity.
• No changes to the structural stormwater practices shall be made without written
authorization from the Division of Water Quality.
If you have any questions or would like to discuss this project, please contact Ms. Debbie
Edwards at 919.733.9502 or Ms. Cynthia Van Der Wiele at 919.715.3473.
Sincerely,
John R. Dorney, Manager
401/Wetlands Unit
cc: Steve Mitchell, DWQ Raleigh Regional Office
Kevin Martin, S& EC, Inc.
File copy
Project Name: Morris Station Subdivision-- Town Home Sections
Project No. DWQ 040084
pond A
SUBMITTED DESIGN. REQUIRED DESIGN:
elevations 1.9 average depth status
Bottom of Basin (ft) 322
Permanent Pool (ft) 325 3 ft. depth ok
Temporary Pool (ft) 326.71 1.71 ft. depth ok
areas
Permanent Pool SA (sq ft) 7079 18402 sq. ft. check surfac
Drainage Area (ac) 11.9 ?3899 based on avg depth check surfac
Impervious Area (ac) 3.57 30.0%
-
volumes
Permanent Pool (cu ft) 13417
Temporary Pool (cu ft) 14000 13823 cu. ft. ok
Forebay (cu ft) 2800 20.9% ok
other parameters
SA/DA 1.34 3.55 -
Orifice Diameter (in) 1.53 0.06 cfs drawdown -
Design Rainfall (in) 1 2.9 day drawdown ok
Linear Interpolation of Correct SAIDA***
3 ft. Permanent Pool Depth
% Impervious SA/DA fron (Avg. Depth)
Next Lowest 20 3.36 4.42048877 ?. t
Project Impervious 30.0 3.5- 4.61 2.5
Next Highest 40 3.7 t 4.80048877 -1.78
3 ft 4
Project Name: Morris Station Subdivision-- Town Home Sections
Project No. DWQ 040084
SUBMITTED DESIGN: Pond B REQUIRED DESIGN:
elevations 1.7 average depth status
Bottom of Basin (ft) 326
Permanent Pool (ft) 329 3 ft. depth ok
Temporary Pool (ft) 330.23 1.23 ft. depth ok
areas
Permanent Pool SA (sq ft)
5199
13765 sq. ft.
check surfac
Drainage Area (ac) 8.5 18210 based on avg depth check surfac
Impervious Area (ac) 2.5 29.4%
-
volumes
Permanent Pool (cu ft) 9037
Temporary Pool (cu ft) 9800 9710 cu. ft. ok
Forebay (cu ft) 2058 22.8 % check forebc
other parameters
SA/DA 1.34 3.72 -
Orifice Diameter (in) 1:39 0.04 cfs drawdown -
Design Rainfall (in) 1 2.9 day drawdown ok
Linear Interpolation of Correct SAIDA"*
3 ft. Permanent Pool Depth
% Impervious SA/DA fron (Avg. Depth)
Next Lowest 20 3.36 4.571309867 ?.4
Project Impervious 29.4 3.7-' 4.93 -.76
Next Highest 30 3.71 4.951309807 2J,?
3 ft 4

Project Name: Morris Station Subdivision-- Town Home Sections
Project No. DWQ 040084
SUBMITTED DESIGN: Pond C REQUIRED DESIGN:
elevations 1.0 average depth status
Bottom of Basin (ft) 316.5
Permanent Pool (ft) 319.5 3 ft. depth ok
Temporary Pool (ft) 320.7 1.2 ft. depth ok
areas
Permanent Pool SA (sq ft) 5675 10962 sq. ft. check surfac
Drainage Area (ac) 6.8 14973 based on avg depth check surfac
Impervious Area (ac) 1.97 29.0%
-
volumes
Permanent Pool (cu ft) 9020
Temporary Pool (cu ft) 7800 7670 cu. ft. ok
Forebay (cu ft) 1677 18.6% ok
other parameters
SA/DA 1.34 3.70 -
Orifice Diameter (in) 1.25 0.03 cfs drawdown -
Design Rainfall (in) 1 2.8 day drawdown ok
Linear Interpolation of Correct SAIDA"*
3 ft. Permanent Pool Depth
% Im ervious SA/DA fron (Avg. Depth)
Next Lowest 20 3.36 4.71414978 2.4
Project Impervious 29.0 3.7U 5.06 2.74
Next Highest 30 3.74 5.09414975 ?. 78
3 ft 4
of wAr9
`are QG
? r
C3 , `C
Michael F. Easley, Governor
William G. Ross Jr., Secretary
North Carolina Department of Environment and Natural Resources
Alan W. Klimek, P.E., Director
Division of Water Quality
Coleen H. Sullins, Deputy Director
Division of Water Quality
June 22, 2004
Project Name: River Trace Subdivision Phase H
Person County
EXPRESS REVIEW ACCEPTANCE LETTER
Mr. Neal Floyd
Neal Floyd and Associates
7908 Audubon Drive
Raleigh, NC 27615
Fax #: [phone]
Subject Property: River Trace Subdivision Phase II
Dear Mr. Floyd:
On June 21, 2004, the Wetlands/401 Unit of the Division of Water Quality received a Fax/email request
from K & L Properties (Steve Kelly) regarding a project known as "River Trace Subdivision Phase II"
for acceptance into the Express Review Program. This letter. advises you that your project will be
accepted into the Express Review Program for a stream origin determination.
Please keep in mind that the clock for this project will not start until receipt of the completed application
package and required fee are received.
If you have any questions or wish to discuss these matters further please do not hesitate to call John
Dorney at 919-733-9646 or Deborah Edwards at 733-9502.
Sincerely,
Oam GA "Z
c?
#-'-Alan W. Klimek, P.E., Director
AWK/cvdw
cc: Steve Mitchell, DWQ Raleigh Regional Office
File copy
Central Files
Filename
6%
N. C. Division of Water Quality, 401 Wetlands Certification Unit,
1650 Mail Service Center, Raleigh, NC 27699-1650 (Mailing Address)
2321 Crabtree Blvd., Raleigh, NC 27604-2260 (Location)
[phone] (phone), 919-733-6893 (fax), (htto://h2o.enr.state.nc.us/ncwetlands)
Customer Service #: 1-877-623-6748
Soil & Environmental Consultants, PA
11010 Raven Ridge Road • Raleigh, North Carolina 27614 • Phone: [phone] • Fax: [phone]
www.SandEC.com
June 2, 2004
NCDENR-DWQ
Attn: Ms. Debbie EdwardsQ CA-0679
2321 Crabtree Blvd.
Parkview Building
Raleigh, NC 27604
RE: Nationwide Permit 14/NCDWQ Express Permit Review
Providence Place (formerly Morris Station Subdivision)
Morrisville, Wake County, North Carolina
S&EC Project #: 8464.W1
Dear Ms. Edwards:
*0l0
Nps?
?Q?? 1ooQ
sFe7o
*
P
On behalf of Fortis/Westminster (applicant), we hereby re-apply for proposed permanent
impacts to an intermittent stream and a perennial stream resulting from two road crossings. In
addition, we request written concurrence from the North Carolina Division of Water Quality
that the project complies with the 401 Water Quality Certification associated with NWT 14.
A Pre-construction Notification Application (PCN) is attached, )Vhich includes an agent
authorization form. A copy of the DWQ Express Review Acc ptance Letter is also attached.
The Corps previously issued a NW14 for the project (copy at ched) and DWQ had agreed
with all aspects of the previous application except for the stormwater treatment plans.
Therefore, the proposed impacts are identical to the previous submittal.
The site is ± 178.37 acres in size and is located west of Highway 54 and Church Street (SR
1637) north of Morrisville, Wake County, North Carolina. Weaver Road bisects the subject
property from east to west. Please refer to the attached map for the project's location on a
USGS topographic quadrangle.
The purpose of this project is to construct a residential subdivision that will meet the demand
for housing in this area. Proposed impacts resulting from the two road crossings will total 152
linear feet of intermittent/unimportant stream, 127 linear feet of perennial/important stream,
and 0.09 acres of jurisdictional wetlands.
S&EC personnel did not conduct the wetland delineation of the subject property. The
applicant provided S&EC a signed wetland delineation map prior to submittal of this
application. The jurisdictional determination was issued March 4, 2003, by Ms. Andrea Wade
of the USACE (AID 200320078). A copy of the Notification of Jurisdictional Determination
and the signed wetland map has been included. In preparation for the DWQ Express
Permitting procedure, S&EC visited the site to determine points along the impacted streams at
Charlotte Office: Greensboro Office: Hickory Office:
236 LePhillip Court, Suite C 3817-E Lawndale Drive 622 Coon Mountain Lane
Concord, NC 28025 Greensboro, NC 27455 Taylorsville, NC 28681
Phone: [phone] Phone: [phone] Phone [phone]
Fax: [phone] Fax: [phone] Fax: [phone]
June 2, 2004
S&EC Project #: 8464.W1
Page 2 of 3
which the channels became important and perennial and Debbie Edwards of DWQ confirmed
them in the field. Please see the attached inset map depicting the approximate starting points.
Nationwide Permit 14
In order to access the property from existing streets, two unnamed tributaries to Kit Creek will
be permanently impacted by two stream crossings. Mason Farm Road (Impacts l & 2 on
attached maps) will impact a small intermittent channel and the main channel. The small
channel (Impact 2) is 39 feet long and drains into the main channel from the east. The entire
channel will be permanently filled in order to construct the road crossing. Impacts to the main
channel will total 113 linear feet (Impact 1) and 1,916 linear feet of wetlands will be impacted
as a result of this crossing. Everett Fields Road (Impact 3) will impact 127 linear feet of
perennial/important channel.
A total of 0.09 acres of jurisdictional wetlands will be impacted; the Mason Farm Road
crossing will impact 0.04 acres and the Everett Fields Road crossing will impact 0.05 acres.
Prior to application submittal, the Town of Morrisville planning board reviewed the site plans.
The town requires that the proposed roads be located in their current location in order to allow
emergency vehicles access to the subdivision from Barbee Road (southeast of property) and
Church Street (adjacent to the east of the property). Please see attached Town of Morrisville
letter and Rice & Associates justification letter. Previous site plans had the Church Road.
entrance located further north, impacting additional jurisdictional wetlands. In order to avoid
these wetland impacts, the applicant re-located the road further south. In order to minimize
impacts, headwalls will be installed on either side of the proposed roadways. The applicant
will employ appropriate erosion and sedimentation controls during construction. This project
will comply with the general and regional conditions of NWP 14.
NC-DWQ's current policy requires mitigation for perennial stream impacts of greater then
150 linear feet per project in a buffered basin. There are 279 linear feet of proposed stream
impacts (127' perennial and 152' intermittent) and 0.09 acres of proposed wetland impacts.
Impacts are less than 150 linear feet per crossing and less than 150' of perennial channel for
the entire project. Therefore DWQ should not require stream mitigation.
SCin?Z?Z?-"
cerelyKevin Martin
President
June 2, 2004
S&EC Project #: 8464.W1
Page 3 of 3
Attachments: (five copies of each unless otherwise noted)
Pre-construction (PCN) notification form
Express Review Acceptance Letter (4/26/04)
Site Location Map-USGS
Site Location Map - Soil Survey
Site Plan/Impact Maps
Notification of Jurisdictional Determination
Agent Authorization Form
Town of Morrisville Letter
USACE NW 14 Permit
$1,000 Express Permitting Check to NCDWQ
Cover letters and Stormwater Plans (Rice & Associates), 4/22/04 & 5/5/04 (3 copies)
APPLICATION HAS BEEN APPROVED FOR NCDWQ EXPRESS PERMIT REVIEW
Office Use Only: Form Version May 2002
USACE Action ID No. DWQ No. EXP O 4 " n b 7 9
(If any particular item is not applicable to this project, please enter "Not Applicable" or "N/A".)
1. Processing
1. Check all of the approval(s) requested for this project:
® Section 404 Permit ? Riparian or Watershed Buffer Rules
? Section 10 Permit ? Isolated Wetland Permit from DWQ
® 401 Water Quality Certification
2. Nationwide, Regional or General Permit Number(s) Requested: NWT 14
3. If this notification is solely a courtesy copy because written approval for the 401 Certification
is not required, check here: ?
4. If payment into the North Carolina Wetlands Restoration Program (NCWRP) is proposed for
mitigation of impacts (verify availability with NCWRP prior to submittal of PCN), complete
section VIII and check here:
5. If your project is located in any of North Carolina's twenty coastal counties (listed on page
4), and the project is within a North Carolina Division of Coastal Management Area of
Environmental Concern (see the top of page 2 for further details), check here: ?
II. Applicant Information
Owner/Applicant Information
Name: Fortis/Westminster Homes
Mailing Address: Attn: Mr. Craig Lang
3500 Regency Parkway, Suite F
Cary, North Carolina 27511
Telephone Number: 919-462-0070 Fax Number: 919-854-0812
E-mail Address:
2. Agent/Consultant Information (A signed and dated copy of the Agent Authorization letter
must be attached if the Agent has signatory authority for the owner/applicant.)
Name: Mr. Kevin Martin
Company Affiliation: Soil & Environmental Consultants, PA
Mailing Address: 11010 Raven Ridge Road
Raleigh, NC 27614
Telephone Number: [phone] Fax number: [phone]
E-mail Address: Kmartin(a-,SandEC.com
Page 1 of 9
III. Project Information
Attach a vicinity map clearly showing the location of the property with respect to local
landmarks such as towns, rivers, and roads. Also provide a detailed site plan showing property
boundaries and development plans in relation to surrounding properties. Both the vicinity map
and site plan must include a scale and north arrow. The specific footprints of all buildings,
impervious surfaces, or other facilities must be included. If possible, the maps and plans should
include the appropriate USGS Topographic Quad Map and NRCS Soil Survey with the property
boundaries outlined. Plan drawings, or other maps may be included at the applicant's discretion,
so long as the property is clearly defined. For administrative and distribution purposes, the
USACE requires information to be submitted on sheets no larger than 11 by 17-inch format;
however, DWQ may accept paperwork of any size. DWQ prefers full-size construction
drawings rather than a sequential sheet version of the full-size plans. If full-size plans are
reduced to a small scale such that the final version is illegible, the applicant will be informed that
the project has been placed on hold until decipherable maps are provided.
1. Name of project: Providence Place sub. (formerly Morris Station) formerly Weaver Pond)
2. T.I.P. Project Number or State Project Number (NCDOT Only): NA
3. Property Identification Number (Tax PIN): 074602567352
4. Location
County: Wake Nearest Town: Morrisville
Subdivision name (include phase/lot number):
Directions to site (include road numbers, landmarks, etc.): From the Town of Morrisville,
proceed north on Church Street ( SR 1637) approximately 2.5 miles until reaching Weaver
Road. Turn left on Weaver Road. Weaver Road bisects the subject property from east to
west.
5. Site coordinates, if available (UTM or Lat/Long):
Mason Town Road Impact: 035°51'21.90"N/078°50'45.15"W
Everett Fields Road Impact: 035°51' 10.60"N/078°50'49.41 "W
(Note - If project is linear, such as a road or utility line, attach a sheet that separately lists the
coordinates for each crossing of a distinct waterbody.)
6. Property size (acres): ± 178.37 Acres
7. Nearest body of water (stream/river/sound/ocean/lake): UT to Kit Creek
8. River Basin: Cape Fear
(Note - this must be one of North Carolina's seventeen designated major river basins. The
River Basin map is available at http://h2o.enr.state.nc.us/admin/maps/.)
9. Describe the existing conditions on the site and general land use in the vicinity of the project
at the time of this application: The site is an undeveloped, wooded tract.
Page 2 of 9
10. Describe the overall project in detail, including the type of equipment to be used:
The proposed project is a single-family residential subdivision with typical utilities (i.e.,
sewer, water, electric, etc.) One intermittent stream and a perennial stream will be impacted
to provide road crossings for the Morris Station Subdivision. Typical excavating and grading
equipment will be used during construction activities.
11. Explain the purpose of the proposed work: Two stream crossings are proposed in order to
access contiguous portions of the subdivision.
IV. Prior Project History
If jurisdictional determinations and/or permits have been requested and/or obtained for this
project (including all prior phases of the same subdivision) in the past, please explain. Include
the USACE Action ID Number, DWQ Project Number, application date, and date permits and
certifications were issued or withdrawn. Provide photocopies of previously issued permits,
certifications or other useful information. Describe previously approved wetland, stream and
buffer impacts, along with associated mitigation (where applicable). If this is a NCDOT project,
list and describe permits issued for prior segments of the same T.I.P. project, along with
construction schedules.
No previously issued permits are known to exist for the site. S&EC personnel did not conduct
the wetland delineation on the subject property. The applicant provided S&EC a signed wetland
delineation map prior to submittal of this application. The jurisdictional determination was
issued March 4 2003, by Ms. Andrea Wade of the USACE (AID 200320078. A copy of the
Notification of Jurisdictional Determination has been included. Debbie Edwards of DWO
verified the perennial stream start points in the field. The USACE issued a NW 14 permit on
3/19/2004 (Action ID200320078 , a copy is attached.
V. Future Project Plans
Are any future permit requests anticipated for this project? If so, describe the anticipated work,
and provide justification for the exclusion of this work from the current application.
No future impacts are expected at this time.
VI. Proposed Impacts to Waters of the United States/Waters of the State
It is the applicant's (or agent's) responsibility to determine, delineate and map all impacts to
wetlands, open water, and stream channels associated with the project. The applicant must also
provide justification for these impacts in Section VII below. All proposed impacts, permanent
and temporary, must be listed herein, and must be clearly identifiable on an accompanying site
plan. All wetlands and waters, and all streams (intermittent and perennial) must be shown on a
delineation map, whether or not impacts are proposed to these systems. Wetland and stream
evaluation and delineation forms should be included as appropriate. Photographs may be
included at the applicant's discretion. If this proposed impact is strictly for wetland or stream
Page 3 of 9
mitigation, list and describe the impact in Section VIII below. If additional space is needed for
listing or description, please attach a separate sheet.
1. Provide a written description of the proposed impacts:
An intermittent channel and a perennial channel will be permanently impacted for two road
crossings. The perennial channel will be impacted in two separate locations. In addition, 0.09
acres of jurisdictional wetlands will be impacted as a result of this project.
2. Individually list wetland impacts below:
Wetland Impact Area of Located within Distance to
Site Number Type of Impact* Impact 100-year Floodplain** Nearest Stream Type of Wetland***
(indicate on map) (acres) (yes/no) (linear feet)
Mason Town
Road (Impacts 1 Grading/fill 0.04 No Adjacent Headwater
& 2)
Everett Fields
Road (Impact 3) Grading/fill 0.05 No Adjacent Headwater
* List each impact separately and identify temporary impacts. Impacts include, but are not limited to: mechanized clearing, grading, fill,
excavation, flooding, ditching/drainage, etc. For dams, separately list impacts due to both structure and flooding.
** 100-Year floodplains are identified through the Federal Emergency Management Agency's (FEMA) Flood Insurance Rate Maps
(FIRM), or FEMA-approved local floodplain maps. Maps are available through the FEMA Map Service Center at 1-800-358-9616, or
online at http://www.fema.gov.
*** List a wetland type that best describes wetland to be impacted (e.g., freshwater/saltwater marsh, forested wetland, beaver pond,
Carolina Bay, bog, etc.) Indicate if wetland is isolated (determination of isolation to be made by USACE only).
List the total acreage (estimated) of all existing wetlands on the property: < 1 acre
Total area of wetland impact proposed: 0.09 Acres
3. Individually list all intermittent and perennial stream impacts below:
Stream Impact Site Type of Length of Average Width Perennial or
Number Impact* Impact Stream Name** of Stream Intermittent?
(indicate on map) (linear feet) Before Impact (please specify)
Mason Farm Road Culvert/rip-rap 113 UT to Kit Creek 3-4 feet Intermittent/
(Impact 1) Unimportant
Mason Farm Road
Culvert/rip-rap
39
UT to Kit Creek
2-3 feet Intermittent/
(Impact 2) Unimportant
Everett Fields Road Culvert/rip-rap 127 UT to Kit Creek 34 feet Perennial/Important
(Impact 3
* List each impact separately and identify temporary impacts. Impacts include, but are not limited to: culverts and associated rip-rap,
dams (separately list impacts due to both structure and flooding), relocation (include linear feet before and after, and net loss/gain),
stabilization activities (cement wall, rip-rap, crib wall, gabions, etc.), excavation, ditching/straightening, etc. If stream relocation is
proposed, plans and profiles showing the linear footprint for both the original and relocated streams must be included.
** Stream names can be found on USGS topographic maps. If a stream has no name, list as UT (unnamed tributary) to the nearest
downstream named stream into which it flows. USGS maps are available through the USGS at 1-800-358-9616, or online at
www.usgs.gov. Several internet sites also allow direct download and printing of USGS maps (e.g., www.tonozone.com,
www.mMquest.com, etc.).
Cumulative impacts (linear distance in feet) to all streams on site: 279 linear feet
Page 4 of 9
4. Individually list all open water impacts (including lakes, ponds, estuaries, sounds, Atlantic
Ocean and any other water of the U.S.) below:
Open Water Impact Area of Name of Waterbody Type of Waterbody
Site Number Type of Impact* Impact
(if applicable) (lake, pond, estuary, sound,
(indicate on map) (acres) bay, ocean, etc.)
NA
* List each impact separately and identify temporary impacts. Impacts include, but are not limited to: fill, excavation, dredging,
flooding, drainage, bulkheads, etc.
5. Pond Creation
If construction of a pond is proposed, associated wetland and stream impacts should be
included above in the wetland and stream impact sections. Also, the proposed pond should
be described here and illustrated on any maps included with this application.
Pond to be created in (check all that apply): ? uplands ? stream ? wetlands
Describe the method of construction (e.g., dam/embankment, excavation, installation of
draw-down valve or spillway, etc.):-NA
Proposed use or purpose of pond (e.g., livestock watering, irrigation, aesthetic, trout pond,
local stormwater requirement, etc.): NA
Size of watershed draining to pond: NA Expected pond surface area: NA
VII. Impact Justification (Avoidance and Minimization)
Specifically describe measures taken to avoid the proposed impacts. It may be useful to provide
information related to site constraints such as topography, building ordinances, accessibility, and
financial viability of the project. The applicant may attach drawings of alternative, lower-impact
site layouts, and explain why these design options were not feasible. Also discuss how impacts
were minimized once the desired site plan was developed. If applicable, discuss construction
techniques to be followed during construction to reduce impacts.
The applicant requested a wetland delineation on-site prior to site plan development in order to
determine the extent and location of wetlands and streams. Although jurisdictional areas were
avoided to the maximum extent practical, two unnamed tributaries to Kit Creek separate the
majority of the eastern and central portions of the property from one another, making it necessary
to construct a road crossing over each feature to access high ground. Prior to application
submittal, the Town of Morrisville planning board reviewed the site plans. The town requires
that the proposed roads be located in their current location in order to allow emergency vehicles
access from Barbee Road (southeast of property) and Church Street (adjacent to the east of the
property) to the subdivision (see attached Town of Morrisville letter and justification letter from
Rice & Associates). Previous site plans had the Church Street entrance planned further north,
impacting existingjurisdictional wetlands. In order to avoid these wetland impacts, the applicant
re-located the road further south. The applicant plans to cross both channels at an approximately
perpendicular angle in order to minimize impact to the streams.
Page 5 of 9
VIII. Mitigation
DWQ - In accordance with 15A NCAC 2H .0500, mitigation may be required by the NC
Division of Water Quality for projects involving greater than or equal to one acre of impacts to
freshwater wetlands or greater than or equal to 150 linear feet of total impacts to perennial
streams.
USACE - In accordance with the Final Notice of Issuance and Modification of Nationwide
Permits, published in the Federal Register on March 9, 2000, mitigation will be required when
necessary to ensure that adverse effects to the aquatic environment are minimal. Factors
including size and type of proposed impact and function and relative value of the impacted
aquatic resource will be considered in determining acceptability of appropriate and practicable
mitigation as proposed. Examples of mitigation that may be appropriate and practicable include,
but are not limited to: reducing the size of the project; establishing and maintaining wetland
and/or upland vegetated buffers to protect open waters such as streams; and replacing losses of
aquatic resource functions and values by creating, restoring, enhancing, or preserving similar
functions and values, preferable in the same watershed.
If mitigation is required for this project, a copy of the mitigation plan must be attached in order
for USACE or DWQ to consider the application complete for processing. Any application
lacking a required mitigation plan or NCWRP concurrence shall be placed on hold as
incomplete. An applicant may also choose to review the current guidelines for stream restoration
in DWQ's Draft Technical Guide for Stream Work in North Carolina, available at
htlp://h2o.enr.state.nc.us/ncwetlands/stn-ngide.html.
1. Provide a brief description of the proposed mitigation plan. The description should provide
as much information as possible, including, but not limited to: site location (attach directions
and/or map, if offsite), affected stream and river basin, type and amount (acreage/linear feet)
of mitigation proposed (restoration, enhancement, creation, or preservation), a plan view,
preservation mechanism (e.g., deed restrictions, conservation easement, etc.), and a
description of the current site conditions and proposed method of construction. Please attach
a separate sheet if more space is needed.
The jurisdictional areas have been avoided to the maximum extent practicable. Impacts to
creeks on-site will be minimized by using headwalls and crossing at nearly perpendicular
angles. reasonable impacts to intermittent streams do not require mitigation,
however, the Everett Fields Road crossing will impact 127 linear feet of important/perennial
channel. This is less than the 150' DWQ mitigation threshold for perennial stream impacts
per project. Impacts to wetlands are less than 1/10 of an acre, therefore, wetland mitigation
is not proposed.
2. Mitigation may also be made by payment into the North Carolina Wetlands Restoration
Program (NCWRP). Please note it is the applicant's responsibility to contact the NCWRP at
[phone] to determine availability and to request written approval of mitigation prior
to submittal of a PCN. For additional information regarding the application process for the
Page 6 of 9
NCWRP, check the NCWRP website at http://h2o.enr.state.ne.us/wrp/index.htm. If use of
the NCWRP is proposed, please check the appropriate box on page three and provide the
following information:
Amount of stream mitigation requested (linear feet): 0
Amount of buffer mitigation requested (square feet): NA
Amount of Riparian wetland mitigation requested (acres): NA
Amount of Non-riparian wetland mitigation requested (acres): NA
Amount of Coastal wetland mitigation requested (acres): NA
IX. Environmental Documentation (required by DWQ)
Does the project involve an expenditure of public (federal/state) funds or the use of public
(federal/state) land?
Yes ? No
If yes, does the project require preparation of an environmental document pursuant to the
requirements of the National or North Carolina Environmental Policy Act (NEPA/SEPA)?
Note: If you are not sure whether a NEPA/SEPA document is required, call the SEPA
coordinator at [phone] to review current thresholds for environmental documentation.
Yes ? No ?
If yes, has the document review been finalized by the State Clearinghouse? If so, please attach a
copy of the NEPA or SEPA final approval letter.
Yes ? No ?
X. Proposed Impacts on Riparian and Watershed Buffers (required by DWQ)
It is the applicant's (or agent's) responsibility to determine, delineate and map all impacts to
required state and local buffers associated with the project. The applicant must also provide
justification for these impacts in Section VII above. All proposed impacts must be listed herein,
and must be clearly identifiable on the accompanying site plan. All buffers must be shown on a
map, whether or not impacts are proposed to the buffers. Correspondence from the DWQ
Regional Office may be included as appropriate. Photographs may also be included at the
applicant's discretion.
Will the project impact protected riparian buffers identified within 15A NCAC 2B .0233
(Meuse), 15A NCAC 2B .0259 (Tar-Pamlico), 15A NCAC 2B .0250 (Randleman Rules and
Water Supply Buffer Requirements), or other (please identify, )?
Yes ? No ® If you answered "yes", provide the following information:
Identify the square feet and acreage of impact to each zone of the riparian buffers. If buffer
mitigation is required calculate the required amount of mitigation by applying the buffer
multipliers.
Page 7 of 9
Zone* Impact
(square feet) Multiplier Required
Mitigation
1 NA 3 NA
2 NA 1.5 NA
Total NA NA
* Zone 1 extends out 30 feet perpendicular from near bank of channel; Zone 2 extends an
additional 20 feet from the edge of Zone 1.
If buffer mitigation is required, please discuss what type of mitigation is proposed (i.e., Donation
of Property, Conservation Easement, Riparian Buffer Restoration / Enhancement, Preservation or
Payment into the Riparian Buffer Restoration Fund). Please attach all appropriate information as
identified within 15A NCAC 2B .0242 or.0260.
Site is located in the Cane Fear River Basin. The applicant has. however, applied a 50 foot
riparian buffer around stream features on-site per the Town of Morrisville stormwater
management rules.
XI. Stormwater (required by DWQ)
Describe impervious acreage (both existing and proposed) versus total acreage on the site.
Discuss stormwater controls proposed in order to protect surface waters and wetlands
downstream from the property.
The nroiect engineer has calculated impervious surface of the single familv portion of the site to
be under 30% impervious and DWQ previously concurred with that assessment. Calculations
and designs for the townhome portions of the project by Rice & Assoc. are attached with a
4/22/04 cover letter and calculations and designs for the amenity site are also attached with a
5/5/04 cover letter.
XII. Sewage Disposal (required by DWQ)
Clearly detail the ultimate treatment methods and disposition (non-discharge or discharge) of
wastewater generated from the proposed project, or available capacity of the subject facility.
The subdivision will utilize sanitary sewer and public water service.
XIII. Violations (required by DWQ)
Is this site in violation of DWQ Wetland Rules (15A NCAC 2H .0500) or any Buffer Rules?
Yes ? No
Is this an after-the-fact permit application?
Yes ? No
Page 8 of 9
XIV. Other Circumstances (Optional):
It is the applicant's responsibility to submit the application sufficiently in advance of desired
construction dates to allow processing time for these permits. However, an applicant may
choose to list constraints associated with construction or sequencing that may impose limits on
work schedules (e.g., draw-down schedules for lakes, dates associated with Endangered and
Threatened Species, accessibility problems, or other issues outside of the applicant's control).
NA
C? /Ac
ApplicantA ge s Signature Date
(Agent's signature i alid only if an authorization letter from the applicant is provided.)
Page 9 of 9
OF WA TFh, Michael F. Easley, Governor
William G. Ross Jr., Secretary
QG North Carolina Department of Environment and Natural Resources
Eq T. Alan W. Klimek, P.E., Director
> y Division of Water Quality
.r Coleen H. Sullins, Deputy Director
Division of Water Quality
April 26, 2004
Project Name: Morris Station
Wake County
EXPRESS REVIEW ACCEPTANCE LETTER
Fortis/Westminister Homes
Attn: Craig Lang
3500 Regency Pkwy., Suite F
Cary, NC 27511
Fax #: S&EC 919-846-9467
Subject Property: West of Hwy 54 and SR 1637, South of proposed I-540, East of Davis Drive and
North of SR 1635
Dear Mr. Lang:
On April 23, 2004, the Wetlands/401 Unit of the Division of Water Quality received a Fax/email request
from Soil & Environmental Consultants regarding a project known as "Morris Station" for acceptance
into the Express Review Program. This letter advises you that your project will be accepted into the
Express Review Program once the following items are received: 1) a fee of $1,000.00 made payable to
the North Carolina Division of Water Quality, five complete and collated copies of the application
and 3) five copies of all additional information pertaining to is project. Thank you for your attention
to this matter:
Please keep in mind that the clock for this project will not start until receipt of the completed application
package and required fee are received.
If you have any questions or wish to discuss these matters further please do not hesitate to call John
Dorney at 919-733-9646 or Deborah Edwards at 733-9502.
Sincerely,

Alan W. Klimek, P.E., Director
cc: Steve Mitchell- DWQ Regional Office
File copy
Central Files
Kevin Martin - S& EC
No M.,
N. C. Division of Water Quality, 401 Wetlands Certification Unit,
1650 Mail Service Center, Raleigh, NC 27699-1650 (Mailing Address)
2321 Crabtree Blvd., Raleigh, NC 27604-2260 (Location)
[phone] (phone), 919-733-6893 (fax), (httpJ/h2o.enr.state.nc.us/ncwetlands)
Customer Service #: 1-877-623-6748
A Michael F. Easley, Governor
William G. Ross Jr., Secretary
\O G North Carolina Department of Environment and Natural Resources
E Alan W. Klimek, P. E. Director
Division of Water Quality
Coleen H. Sullins, Deputy, Director
Division of Water Quality
March 3, 2004
DWQ Project No. 04-0084
Wake County
Pagel of 2
Mr. Craig Lang
Fortis/Westminster Homes
3500 Regency Pkwy, suite F
Cary, NC 27511
Subject Property: Morris Station Subdivision
UT to Kit Creek
REJECTION of the application for 401 Water Quality Certification for the Express Review Program
Dear Mr. Lang:
An application was submitted into the Express Review Program on February 4, 2004, to impact 0.09 acres of wetlands
and 279 feet of stream to construct the proposed Morris Station Subdivision in Wake County. As discussed in our
training sessions with Raleigh and Wilmington, this program has a firm schedule that is required in order to review the
Express Review Projects that are accepted into this program. The schedule that is required to be followed involves a 30-
day review period but also includes requirements for prompt and complete responses to our questions (see attachment).
Unfortunately, the last response dated February 27, 2004, from your engineer, did not provide the information requested
on February 19, 2004 and February 24, 2004. Therefore, the DWQ does not have the information needed in order to
approve the issuance of a 401 Water Quality Certification for the subject property and we will have to retire this file.
The chronology for this project is as follows. A site visit was conducted on February 17, 2004, with an additional
information letter sent on February 19, 2004 (see attached). An office meeting was held on February 24, 2004, with
Steve Rice from Rice & Associates, Kevin Martin from S&EC, John Dorney from the Division of Water Quality (DWQ),
Debbie Edwards from DWQ and yourself. This meeting was conducted to address the additional information that was
needed in order to review the subject property. Several questions were addressed and answered during this meeting.
However additional information was still needed pertaining to a stormwater management plan for the townhome section c
Rice. However as
this plan.
-I. This information was submitted on February 27, 2004, by your engineer, Steve
reviewing the submittal, the DWQ still lacks important information needed to review
Please review following information that will be required for any future submittals for this project:
Stormwater Management Plan for the Townhome Section
Pond A
(a) Please clarify whether the area of 1-540 is excluded from the calculations to be sure pond is large enough.
(b) The wet detention worksheet provided on the 401 /Wetlands Unit website for calculations is required.
(c) A signed and notarized Operation & Management Agreement is required to be submitted to this office and
approved.
(d) Additional information on the inflow and outflow of the stormwater piping from this drainage area is needed.
2. Pond B
(a) Please clarify whether the area of 1-540 is excluded from the calculations to be sure pond is large enough.
(b) The wet detention worksheet provided on the 401 /Wetlands Unit website for calculations is required.
(c) A signed and notarized Operation & Management Agreement is required to be submitted to this office and
approved.
(d) Additional information on the inflow and outflow of the stormwater piping from this drainage area is needed.
North Carolina Division of Water Quality, WETLANDS / 401 UNIT
2321 Crabtree Blvd., Raleigh, NC 27604-2260 (Location)
1650 Mail Service Center, Raleigh, NC 27699-1650 (Mailing Address)
Craig Lang
Page 2of2
3/3/04
3. Pond C
(a) Please clarify whether the area of 1-540 is excluded from the calculations to be sure pond is large enough.
(b) The wet detention worksheet provided on the 401/Wetlands Unit website for calculations is required.
(c) A signed and notarized Operation & Management Agreement is required to be submitted to this office and
approved.
(d) Additional information on the inflow and outflow of the stormwater piping from this drainage area is needed.
4. Please provide a stormwater management plan for the remainder of the development, single family homes section
has an impervious area of 29.8% and the amenity area has a total impervious area of 34.4%. It is likely that non-
structural devices such as grassed swales or level spreaders may be sufficient for this plan.
In order to further review this project, an additional fee will need to be submitted. If you choose to re-enter the Express
Review Program, that fee will be one half of the initial fee required for review under the Express Review Program. Also
you may elect to enter the regular 401 Certification Program and pay its regular fee. If you have any questions, please
telephone John Dorney at 919-733-9646 or Debbie Edwards at 919-733-9584.
Attachments:
Additional information letter d,,
Schedule for Express Review
Cc: Kevin Martin-S&EC
USACE Raleigh Regulatory Field Office
DWQ Raleigh Regional Office
File Copy
Central Files
Steve Rice-Rice & Associates, 978 Trinity Road, Raleigh, NC 27607
DWQ # 04-0084
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U.S. ARMY CORPS OF ENGINEERS
Wilmington District
Action.ID: 200320078 County: Wake
NOTIFICATION OF JURISDICTIONAL DETERMINATION
Property Authorized
Owner Mercury Development Agent Spangler Environmental, Inc..
Attn: Greg Ferguson Attn: James A_ Spangler
Address 5660 Six Forks Road Ste 202. Address P.O. Box 387
Raleigh, NC 27609 Raleigh,.NC 27601
Telephone Number Telephone Number 919-5.46-0754
Size and Location of Property (waterbody, Highway name/number, town, etc.): The property is
located on the east side of Ligon Mill Road, north of its intersection. with Burlington Mill Road, hbrtheast
of Raleigh, Wake County, North Carolina.
Basis for Determination: The site contains wetlands and stream channels with indicators of ordinary
high water marks, located adjacent to an unnamed tributary of Kit Creek , above headwaters, in the Cape
Fear River Basin.
Indicate Which of the Following Apply:
There are waters of the U.S. on the above described property which we strongly suggest should be ,-; veyed. The
surveved lines must be verified by our staff before the Corps will make a final jurisdictional determination on your
property.
Because of the size of your property and our present workload, our identif c:.t= and delineation of your wetlands
cannot be accomplished in a timely. manner. You may wish to. obtain a consultant to obtain a more timely
delineation of the wetlands. Once the consultant has flagged a wetland line on the property, Corps staff will
.,;view it, and, if it is accurate, we strongly recommend that you have the line surveyed for final approval by the
Corps. The Corps will not make a final jurisdictional determination on your property without an approved survey.
X The waters of the U.S., to include wetlands, on your lot have been delineated, and the limits of the Corps
jurisdiction have been explained to you. Unless there is a change in the law or our published regulations, this
determination may be relied upon for a period not to exceed five years from the date of this notification.
There are no waters of the U.S., to include wetlands, present on the above described property which.are subject to
the permit requirements of Section 404 of the Clean Water Act (33 USC 1344). Unless there is a change in the law
or our published regulations, this determination may be relied upon for a period not to exceed five years from the
date of this notification.
Placement of dredged or fill material in wetlands on this property without a Department of the
Army Permit is in most cases a violation of Section 301 of the Clean Water Act (33 USC 1311). A
permit is not required for work on the property restricted entirely to existing high ground. If you
have any questions regarding the Corps of Engineers regulatory program, please contact
Andrea Wade at telephone number. (919) .876 - 8441 exten--ion 31
Project Manager Signature
Date March 4, 2003 Expiration Date March 4, 2008
SURVEY PLAT OR FIELD SKETCH OF THE DESCRIBED PROPERTY AND THE WETLAND
DELINEATION FORM MUST BE ATTACHED TO THE YELLOW (FILE) COPY OF THIS FORM.
TOWN OF MOMSVILLE
P.O.TBox 166, 919.463.6200
Morrisville, NC 27560
1852
January 31, 2003
Mr. Steven Rice, P_E.
Rice& Associates
978 Trinity Road
Raleigh, NC 27607
RE: Weaver Pond Subdivision
ist Site?Plan Review - Not Construction Review
Dear Mr. Rice:
The Town of Morrisville Review Staff reviewed the plans for The Weaver Pond
Subdivision received January 8, 2003, and has the following comments:
Planning
1. Show all landscape buffers on all sheets of the plan. In addition, show all wooded areas
and other natural features to address Condition 93 of the Zoning Approval.
2. Provide a Landscaping Plan. Indicate on the Landscaping plan the site clearing limits.
3. Please show type and quantity of material in each of the landscape buffers. Although the
perimeter buffers are undisturbed additional vegetation may be necessary in order for the
buffer to: function as intended.
4. Access: needs to be provided to the Pennington property (west of Roads B and S).
5. " Linear footage of streets should be put on the plans.
6. Submit a street name application to Wake County. Street names should be shown on the
plan when"it is presented to the Board of Commissioners.
7. Per the subdivision ordinance no cul-de-sac shall be over 450' (Roads P, O, and N).
8. Per the subdivision ordinance no block shall exceed 1200' (Roads A and D).
9. Per the subdivision ordinance there shall be no double frontage lots. Residential block
widths shall provide for two tiers of lots. -
10. Please explain how the developer will deal with roads off of his property (ends of Roads
A and Q.
Weaver Pond Subdivision
January 31, 2003
Page 2
11. Notes need to be clearly written to address what can and cannot be done within the Neuse
River Buffer. Each affected lot needs to be identified on the plans and respective final
plats.
12. There are two possible locations for the Lichten Boulevard Extension over the Railroad
ROW and Church Street, however only one point to accommodate the road is shown in
the Weaver Pond Subdivision (Road B). Because the location for the extension has not
yet been determined, both alignments must be accommodated (Road B and in the vicinity
of Road F).
13. Show all -proposed monument signs, entrance features, and street sign designs and
locations on the plan both temporary and permanent.
14. Show proposed street lighting and any other proposed temporary and permanent lighting
on the plans.
15. What will happen to the adjoining property owners' buildings around lots 4, 5, 10, 11, 12,
-18, 19, and 20?
16. The Site Data table on Sheet C.1.0 should not include the townhouse setback information
to avoid any confusion as the plan moves forward.
17. Sewer allocation for the project will need to be discussed in detail. The entire amount
will not be able to be allocated at this time due to the finite remaining supply.
Engineering
1. Insert the Town Project Number in large bold font on the lower right comer of every
drawing including the cover page. The Town Project No. is 02-10000031.
2. The Developer shall be responsible to control and to initiate clean up of the litter and
refuse generated by the contractors and builders for this development, both on-site and
off-site, during the installation of services and construction of buildings until substantial
completion of all construction. The clean up of litter and refuse shall be done on a
regular basis. -This shall include initiating action and assuming any costs in remedying
the situation. The Developer shall, at no expense to the Town, supply, place and
maintain commercial refuse containers throughout the development during installation of
services and construction of the buildings. Put this note on the Site Plan:
3. Gate valves at the dead-ends shall be the same size of the mainline to facilitate
connection in the future without shutting down the system.
4. Do not show gate valves on the cul-de-sacs. Show the gate valve on the other street.
Weaver Pond Subdivision
January 31, 2003
Page 3
5. The Town of Morrisville standards for cut/fill slopes is as follows:
Cut and fill slopes shall have side slopes no steeper than 411:1 V except as provided
below:
Slopes between 3H: IV and 4H: IV may be allowed if stabilized with vegetation that
requires minimal maintenance such as Weeping Love Grass, Red Fescue or other
variety with similar characteristics. Such slopes shall not be stabilized with turf
grass.
Slopes that are steeper than 3H:1V may be allowed if stabilized with permanent
slope retention devices or a suitable combination of plantings and retention
devices.
The above note is to be added to the grading plan outlined in a box with bold
lettering.
6. The Town of Morrisville standard is that a maximum of 5 lots can drain into each rear
yard catchbasin. This means that if there is more than 5 lots draining into a swale a
catchbasin and storm sewer piping is required. Add the following notes to the Grading
Plan, outline in a box with bold lettering:
A maximum of 5 lots can drain into each rear yard catchbasin.
The minimum slope on swales is 0.50%.
The minimum slope on roads is 0.70%.
The minimum slope on the residential lots is 2.0%. (A flatter slope may be allowed if -
the intent is to save existing vegetation).
The minimum drainage slope between the houses/buildings is 2.0%.
The drawing submitted does not comply with the maximum of 5 lots draining into each
rear yard catchbasin. Revise the design accordingly.
7. Provide a cross-section of the swale located along the rear lot lines. We prefer a
minimum bottom width of 3 feet and side slopes equal to 4H: IV. The side lot channels
located between the houses can be triangular in shape.
8. Show the proposed drainage design for each lot using flow arrows.
Weaver Pond Subdivision
January 31, 2003
Page 4
9. Draw the drainage catchment area boundaries used for the storm sewer calculations on a
plan. Include off-site drainage that drains through the site. Provide stormwater
calculations.
10. Provide on-site stormwater storage to be in compliance with the Town of Morrisville
Stormwater policy. Provide calculations for the stormwater detention ponds.
11: Design the catchbasins in accordance with NCDOT standards. Provide spread
calculations.
11Dame the Watershed on the site and grading plan.
13. Indicate any rock outcropping(s) that would affect the project.
14. Seeps or springs - Locate any known seeps or springs on the grading plan.
15. If the Neuse River Buffer has not been confirmed by a detailed topographical survey
identify the exact stream channel and buffer limits to ensure there is no negative impact
on the proposed development (i.e. effects building set backs, storm sewer FES, etc.).
16. Easements - Clearly identify both private and public storm drainage easements. Show
drainage easements through areas that drain 5 or more lots. Label drainage easements
that drain off-site private property or Public ROW's as Public Drainage Easements.
17. All private drainage systems shall be owned and maintained by the Home Owner
Association. No individual lot owners will be responsible for maintenance of the
drainage systems on their property. Put this note on the Grading Plan.
18. FES shall have a concrete pad place under the end to provide structural support. The
concrete pad shall be 3000_psi and fibre reinforced. Pad shall extend 1 foot under the
FES. Pad length shall be 5 feet and the width shall be 1 foot outside the edge of the pipe.
Or the FES can have a concrete footer that is 1 foot wide x 1.5 feet deep.
19. Are the storm culverts within the NRB designed to accommodate a 100-year storm., Are
they designed to full build-out of the entire catchment area?
20. The storm sewers are shown within the Landscape Buffer (i.e. adjacent Lot 40, 103, 104,
etc.). Storm Sewers can cross the Landscape Buffer perpendicular but cannot run parallel
along the Landscape Buffer.
21. The storm sewer shown adjacent Lot 82 should be diverted directly into the Storm Water
Detention area.
22. Lot 114 requires a storm sewer to accommodate overland flow directed to the lot.
Weaver Pond Subdivision
January 31, 2003
Page 5
23. Show the drainage design for the widening of NC54.
24. Clearly. label the proposed and existing contours so they can be read quickly and easily.
Label the same contour more than once, if this is necessary to allow the contour to be
read quickly.
25. On the plan view, clearly label the size of the proposed and existing sanitary sewers,
storm sewers and watermains. Number all the manholes, drainage inlets and. hydrants.
26. The Town of Morrisville needs access to the sanitary sewer. The maximum longitudinal
slope on the Sewer Easement is 5H:1 V. The maximum cross-slope on the Sewer
Easement is 10%. The above note is to be added to the plan outlined in abox with bold
lettering.
27_ Line up lot lines along the sanitary sewer easements.
28. Show a sanitary sewer to service Lots 13, 14 & 15.
29. We are currently reviewing the sanitary sewer and pumping station design to compare
with our regional sanitary sewer conceptual design. We will provide comments at a later
date.
30. The Town Ordinance requires that stormsewers that cross streets be designed to the 25
year storm.
31. Provide a roadway conceptual plan to show how the undeveloped land abutting this site
will be connected to this development. We need to know this to determine full-build out
traffic and collector street requirements.
32. Confirm the proposed development does not adversely impact adjacent property. In the
reference to the impact to adjacent properties we are referring to; both off-site and on-site
drainage and flooding issues related to the post development flows, overland drainage
along the boundaries of the development is not blocked or impeded, the volume of traffic
generated by the development, access and egress, and that the development does not
compromise the future ability to develop the adjacent properties from the aspect of water,
sanitary sewer, storm sewer and road servicing. Provide a conceptual plan showing that
the adjacent property will be able to be developed and serviced. with water, sanitary
sewer, stormsewer, and roadways.
33. Show all Easements on all the sheets of the plans.
34. Are the houses to be built with slab-on-grade or. crawl spaces?
Weaver Pond Subdivision
January 31, 2003
Page 6
35. The Town of Morrisville would be happyto meet with you to discuss the drainage and
sanitary sewer requirements in more detail.
Fire Department x
Comments forthcoming.
Park &-Recreation Department
Comments forthcoming.
Please revise the plans as needed to address the items listed above and submit five (5)
folded copies of the revised plan as well as a written response to the review comments no later
than 12:00 p.m. Friday, February 14, 2003. Please call Blake Mills, Town Engineer at (919)
463-6191or myself at [phone] if you have any questions or require additional
information.
Sincerely,
Town of Morrisville
Rodney Wadkin
Planner II
Attachments
U.S. ARMY CORPS OF ENGINEERS COPY
Wilmington District
Action ID: 200320078 County: Wake
GENERAL PERMIT (REGIONAL AND NATIONWIDE) VERIFICATION
Property
Authorized
Owner Fortis/Westminister Agent Soil & Environmental Consultants, PA
Attn: Craig Lang Attn: Kevin Martin
Address 3500 Regency Parkway, Ste F Address 11010 Raven Ridge Road
Cary, North Carolina 27511 Raleigh, North Carolina 27614
Telephone Number 843-462-0070 Telephone Number [phone]
Size and Location of Property (waterbody, Highway name/number, town, etc.): The site is
approximately 178 acres in size and located east of Church Street (SR 1637) south of its intersection with
Weaver Road northwest of Morrisville, Wake County, North Carolina.
Description of Activity: This permit authorizes mechanized landclearing, excavation, placement of fill,
and installation of culverts associated with construction of Morris Station subdivision. Impacts authorized
under this permit include 0.09 acre of wetlands and 0.021 acre (152 linear feet intermittent & 127 linear
feet perennial) of stream channel for, two road crossings. Total impacts to wetlands and waters authorized
by this permit are 0.111 acre, which includes 279 linear feet of an unnamed tributary to Kit Creek in the
Cape Fear River Basin.
Applicable Law: X Section 404 (Clean Water Act, 33 USC 1344) only.
-Section 10 (River and Harbor Act of 1899) only.
Authorization: Regional General Permit Number
14 Nationwide Permit Number(s)
Any violation of the conditions of the Regional General or Nationwide Permit referenced above may
subject the permittee to a stop work order, a restoration order, and/or appropriate legal action.
This Department of the Army Regional General Permit or Nationwide Permit verification does not
relieve the permittee of the responsibility to obtain any other required Federal, State, or local
approvals/permits. The permittee may need to contact appropriate State and local agencies before
beginning work. If you have any questions regarding the Corps of Engineers regulatory program,
please contact Jennifer A. Burdette at telephone number (919) 876 - 8441 extension 22.
Regulatory Project Manager Signature,
Authorization Date March 19,2004* Expiration Date . March 19, 2006
SURVEY PLATS, FIELD SKETCH, WETLAND DELINEATION FORM, ETC., MUST BE ATTACHED
TO THE FILE COPY OF THIS FORM, IF REQUIRED OR AVAILABLE.
* Please note that above date reflects the day the work was authorized due to lapse of 45=day review as outlined in
the PCN notification requirements - see Condition 13, 67 Fed.Reg. 2090 (January 15, 2002).
MAR 3 0 2004
411
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JUN-03-2004 THU 1125 AM FAX NO. P. 02
09/02/2004 17:09 FAX (A 002
RAtoiYh. Norge Caoiina 27614 • 1
www,Smm=.com
Consultants, 1'A
phone: [phone] - }pax-. [phone]
AGENT AUTHORIZATION FORM
Aij Blu*j Pe Filled In B The Qmatlando!=
Nme: FORTIS/WESTMINSTER HONES
,address' 3540 REGENCY PARKWAY SUITE F
Phone: GARY, NC 27511
Project Mauve/Description:
6/03/04
Date:
The Deparhonent of the Army
U.S. Army Coxes of Engineers, WAmJngton District
P-O. Box 1690
Wilmington, NC 28402 l
%
?"O"4 r
AtW Y r
Field Office:
)Re: Wetlands Related Consulting and Permitting
To Whom It May Concern,
I, the current t owner, hereby designate and author" So" & Environmental Consultants, ?A, to
act in my behalf as my agent in the processing of permit appiieatiortS, to famish upon request
supple d information in support of applications, etc. from this day forward. The 3 day of
This notification supersedes any previous correspondence concerning the agent for this project.
NOTICE: This autho tion, for liability and pmfessional' courtesy reasons, is valid only for
govemmen?t officials to enter the property when accompanied by 5&EC staff. You should CO S&EC
to arrange a site meeting prior to visiting the cite.
CRAIG LANG
Print Property Owner's Name
eG: W- Jol-m Domey
NCDVNR - DWQ
7321 Crabtree Boulevard
Raleigh, NC 27b ,,
Property tare
cc: Mr. Nevin C Martin
Soil & Environmenbd Consultants, FA
r"Wanibm offii=
chi `
3817-E awrdale Drive 622 aUi?ema
LA
236 LeMUP C4nrt, Suite CC amnshom. NC 27455 Taylonviuo, WC 28491
Coaooid, NC 25025 Mac: [phone] rbwc (828) 635-Sato
Phone: [phone] Rut: [phone] Ew. [phone]
ru- [phone]
Environmental
RICE &
ASSOCIATES
EXP - p r) A ? 7 9
WETLANDS/ 401 GROUP
April 22, 2004
Ms. Debbie Edwards
NC Department of Environment and Natural Resources
Division of Water Quality
WETLANDS 401 K UNIT
2321 Crabtree Boulevard
Raleigh, North Carolina 27604
Re: Morris Station Subdivision -Town Home Sections
DWQ Project No. 04-0084
Dear Ms. Edwards:
JUN 0 3 2004
WATER QUALITY SECTION
Attached you will find supplemental calculations and mapping to allow you to continue
with the review of the referenced 401 Water Quality Certification for the Express Review
Program. Specifically, we are providing you with the following:
A. A map of the entire project, with aerial contours, showing the proposed alignment of
1-540. (The ridge lines and drainage swales have been identified and labeled and
storm water runoff flow arrows are provided to indicate the direction of storm water
runoff flow. No storm water will runoff from the freeway onto any of the Town Home
sites.)
B. A Wet Detention Pond worksheet for each of the three ponds, Ponds "A", "B", and
"C", including larger scale drawings of each of the proposed ponds
C. A signed and notarized Operation & Management Agreement each of the three
ponds, Ponds "A", "B", and "C"
D. Additional information on the inflow and outflow of the storm water piping for each
pond, including outlet structure dimensions (4'x 4'), outlet pipes (18" diameter) at
minimum slopes, and supporting hydraulic calculations such as inflow and outflow
hydrographs, and computer input data.)
In addition, the developer suggested that we downsize the proposed individual building
foot prints for each of the single family sections so that they will be in line with what is
actually proposed to be constructed. This modification resulted in lower impervious
areas. Therefore, we are providing you with a revised impervious area calculation map.
978 Trinity Road • Raleigh, North Carolina 27607 • Voice 919.854.0811 • Fax [phone] • Email: [e-mail]
Ms. Debbie Edwards
Division of Water Quality - Wetlands 401 K Unit
Morris Station Subdivision - Town Home Sections
DWQ Project No. 04-0084
April 22, 2004
Page 2 of 2
Based on the revised calculations it appears that the single family areas will be sufficiently
under 30% to not warrant a storm water management plan. However, we plan to design
the future amenity site utilizing grassed swales and level spreaders due to impervious
area being greater than 30%.
If you have any questions relative to the attached information or hydraulics I will make
myself available to meet with you and/or your new hydraulic engineer and your
convenience.
Very truly yours,
RICE & ASSOCIA
ce, P. E

Project No. DWQ V+, 009- (to be provided by DWQ)
DIVISION OF WATER QUALITY - 401 WET DETENTION BASIN WORKSHEET
DWQ Stormwater Management Plan Review:
A complete stormwater management plan submittal includes a wet detention basin worksheet for each basin,
design calculations, plans and specifications showing all basin and outlet structure details, 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.
1. PROJECT INFORMATION (please complete the following information):
Project Name : M-P&P i5 !?>TATIdk S U6 pi VISIeN
Contact Person: S feye n M, Pied . P 6, Phone Number: ( ql g ) g-15¢- ,9II
For projects with multiple basins, specify which basin this worksheet applies to: PON d "
Basin Bottom Elevation 3111-.0 ft. (average elevation of the floor of the basin)
Permanent Pool Elevation 32 S'. o v ft. (elevation of the orifice invert out)
Temporary Pool Elevation 32&.'J ft. (elevation of the outlet structure invert in)
Permanent Pool Surface Area la? 4 sq. ft. (water surface area at permanent pool elevation)
Drainage Area i t . 9 ac. (on-site and off-site drainage to the basin)
Impervious Area 6.57 ac. (on-site and off-site drainage to the basin)
Permanent Pool Volume 3,`t t 1 cu. ft. (combined volume of main basin and forebay)
Temporary Pool Volume I `t) oo 0 cu. ft. (volume detained on top of the permanent pool)
Forebay Volume o o cu. ft.
SA/DA used I _SA (surface area to drainage area ratio)
Diameter of Orifice l . 53 in. (draw down orifice diameter)
II.' REQUIRED ITEMS CHECKLIST
The following checklist outlines design requirements per the Stormwater Best Management Practices manual
(N.C. Department of Environment, Health and Natural Resources, November 1995) and Administrative Code
Section: 15 ANCAC 2H .1008. Initial in the space provided to indicate the following design requirements have
been met and supporting documentation is attached. I fa requirement has not been met, attach an explanation of
why.
A lic is Initials -Wren M. Pvt 4/ P ? , ?Ghyr. ?Y tnlv;e )
The temporary pool controls runoff from the l inch storm event.
The basin length to width ratio is greater than 3:1.
The basin side slopes are no steeper than 3:1.
A submerged and vegetated perimeter shelf at less than 6:1 is provided.
Vegetation to the permanent pool elevation is specified.
An emergency drain is provided to drain the basin.
The permanent pool depth is between 3 and 6 feet (required minimum of 3 feet).
The temporary pool draws down in 2 to 5 days.
The forebay volume is approximately equal to 20% of the total basin volume.
Sediment storage is provided in the permanent pool.
Access is provided for maintenance.
A minimum 30-foot vegetative filter is provided at the outlet.
A site specific operation and maintenance (O&M) plan is provided.
A vegetation management/mowing schedule is provided in the O&M plan.
Semi-annual inspections are specified in the O&M plan.
A debris check is specified in the O&M plan to be performed after every storm event.
A specific sediment clean-out benchmark is listed (elevation or depth) in O&M plan.
A responsible party is designated in the O&M plan.
FORM SWG100 09/97 Page 1 of 1
WET [WETLAND] DETENTION BASIN OPERATION AND MAINTENANCE AGREEMENT
[Wetland maintenance wording is bracketed. Please modify the document as appropriate.]
M d R tZ 45 STATt404 VW q QXo J. 1-40- 04--499+ P09 P W
The wet{eJ] detention basin system is defined as the wet [wetland] detention basin, pretreatment
including forebays and the vegetated filter if one is provided.
Maintenance activities shall be performed as follows:
1. After every significant runoff producing rainfall event and at least monthly:
a. Inspect the wet [av+ctFrrn l detention basin system for sediment accumulation, erosion, trash
accumulation, vegetated cover, and general condition.
b. Check and clear the orifice of any obstructions such that drawdown of the temporary pool occurs within
2 to 5,days as designed.
2. Repair. eroded areas immediately, re-seed as necessary to maintain good vegetative cover, mow
vegetative cover to maintain a maximum height of six inches, and remove trash as needed.
3. Inspect and repair the collection system (i.e. catch basins, piping, swales, riprap, etc.) quarterly to
maintain proper functioning.
4. Remove accumulated sediment from the wet {ovetla i detention basin system semi-annually or when
depth is reduced to 756/6 of the original design depth (see diagram below). Removed sediment shall be
disposed of in an appropriate manner and shall be handled in a manner that will not adversely impact
water quality (i.e. stockpiling near a wet jwotlem detention basin or stream, etc.).
The measuring device used to determine the sediment elevation shall be such that it will give an accurate
depth reading and not readily penetrate into accumulated sediments.
When the permanent pool depth reads Ot 75 feet in the main pond, the sediment shall be removed.
[For stormwater wetlands: If the elevation of the marsh areas exceed the permanent pool elevation, the
sediment should be removed to design levels. This shall be performed by removing the upper 6 inches of
soil and stockpiling it. Then the marsh area shall be excavated six inches below design elevations.
Afterwards the stockpiled soil should be spread over the marsh surface. The soil should not be stockpiled
for more than two weeks.]
When the permanent pool depth reads 4'75 feet in the forebay [and micro-pool], the sediment shall
be removed.
BASIN DIAGRAM
(fill in the blanks)
V Permanent Pool Elevation ? ZS
Sediment movalEL''322.1 75%
------------------ Sediment Removal Elevation 322.')? 75%
Bottom E vation Ii'LL.o 5%
322-? TO
FOREBAY MAIN POND
Page 1 of 2
5. Remove cattails and other indigenous wetland plants when they cover 50% of the basin surface. These
plants shall.be encouraged to grow along the vegetated shelf and forebay berm.
[For Wetlands: Wetland planting densities in the marsh areas should be maintained by replanting bare
areas as needed. Wetland plants should be encouraged to grow in the marsh areas.]
6. If the basin must be drained for an emergency or to perform maintenance, the flushing of sediment
through the emergency drain shall be minimized to the maximum extent practical
7. All components of the wet [wetlm detention basin system shall be maintained in good working order.
8. Level spreaders or other structures that provide diffuse flow shall be maintained every six months. All
accumulated sediment and debris shall be removed from the structure, and a level elevation shall be
maintained across the entire flow spreading structure. Any down gradient erosion must be repaired and/or
replanted as necessary.

I acknowledge and agree by my signature below that I am responsible for the performance of the seven
maintenance procedures listed above. I agree to notify DWQ of any problems with the system or prior to any
changes to the system or responsible party.
Print name: C? raiG LaYLG!
Title: G and 1?eve100? eye awd 46-qvls111o11s
Address:
1 rZ*%s - A1e'-4tiirhs?er A/em 3500 keaeY'-)? Pki, Sv?? l? Cary 27511
Phone:
Signature:
Date
Note: The legally responsible party should not be a homeowners association unless more than 50% of the
lots have been sold and a resident of the subdivision has been named the president.
I, --1 C?-1Q, I'? OZ.) Y'n th a Notary Public for the State of
County of ?JG?Ce , do hereby certify that & Oda Loan e.
personally appeared before me this Aa day of C"riL , aoo4 -, and acknowledge the due
execution of the forgoing wet [wetland] detention basin maintenance requirements. Witness my hand and
official seal,
\eeeo\\u?u m ??n?s?iiiiiii?
?\G\A R.••S??Ty vs
\%O TAft
Y
?., pUk?L\G ?
.??i??? • • . ? ``te`e
SEAL
My commission expires _1 -3006
Page 2 of 2
\ \ Po 0 \
\ \ \9? s \ t
\ \ \ \ ?o \ MORRIS STATION SUBDIVISION
\? \ FUTURE TOWNHOMES
\ \ \ \ POND "A"
\ \ \ \ SCALE: 1"=100'
i \ \
i?
% ?' \ \ \
Morris Station Date: April 22, 2004
Rice & Associates Proj. # 03-047 By: Cameron Rice
Stormwater Calculations for Pond "A"
Multi-Family Section "A" (MF-A)
Calculate the surface area for a wet detention pond
Wet Detention Pond Calculations (NCDENR's Stormwater BMP, Ar)ril 1999
Impervious Area = 30.0% (See Attachment "A2" for calculations)
Permanent pool depth = 3.0 feet
Surface area/Drainage area ratio = 1.34 (From Table 1.1, copy attached)
Site area = 1 1.9 acres
SA/DA = 1.34
SA = (1.34/100)*(1 1.9 acres) = 0.159 acres = 6,926 sf
Volume to be Stored from the 1" Storm
Runoff Coefficient (Rv) = Storm runoff (in) / Storm rainfall (in)
Percent Impervious (1) = Drainage area (ac) / Impervious portion of DA (ac.)
Rv = 0.05 + .009 * (1)
= 0.05 + .009 * (30.0)
= 0.32 in/in
Vol. from 1" of Runoff = (Design rainfall) * (Rv) * (Drainage Area)
(1 " ) * (0.32 in/in) * (11.9 ac.) * (1 ft/12in )* (43560 sf/ac.)
13,823 cf
Verify required surface area of pond
Area of permanent pool surface = 7,079 sf (normal water surface elevation, NSWE)
Area at NWSE > Required surface area
7,079 sf > 6,926 sf
Verify required volume to capture 1" rainfall
Volume of permanent pool = 13,417cf (normal water surface elevation, NSWE)
Elevation of permanent pool = 325
Volume of temporary pool = 9,800 cf
Elevation of temporary pool = 326.71
Volume provided > Volume Required
14,000 cf > 13,823 cf
G:\Projects\Mercury-Development\Morrisville_01-062\_WORD\Hydraulics\1-inch rain\Pond A.doc
Calculate Diameter of Orifice
Temporary pool volume = 14,000 cf
Height of temporary pool = 1.71 feet
Drawdown time = 2 days or 172,800 seconds
Flowrate = 14,000 cf /172,800 sec = 0.081 cfs
Orifice Coefficient = 0.6
Area = (Q/C)/sgrt(2*G*H)
= (0.081 /0.6)/sgrt{(2)*(32.2)*(1.71)}
= 0.0129 sf
= 1.85 sq in
Diameter = sgrt(area* 4)/II
= sgrt{(1.85)*(4)/3.14}
= 1.53 inches
G:\Projects\Mercury_Development\Morrisville_01-062\_WORD\Hyclraulics\1-inch rain\Pond A.doc
Morris Station Date: April 22, 2004
Rice & Associates Proj. # 03-047 By: Cameron Rice
Attachment "AT'
Impervious Calculations for Pond "A"
Multi-Family Section "A" (MF-A)
104,497 SF (UNITS & DRIVES)
45,819 SF (ROADWAY)
+ 5,210 SF (SIDEWALKS)
155,526 SF TOTAL IMPERVIOUS AREA
652,100 SF TOTAL
-133,677 SF (FUTURE 1-540 R/W)
518,423 SF NET AREA
30.0 % IMPERVIOUS
G:\Projects\Mercury_Development\Morrisville_01-062\_WORD\Hydraulics\1-inch rainA2.doc
3. General
a. Basin shape should minimize dead storage areas and short circuiting. Length to width
ratios should be 3:1 or greater. (Barfield, et al., 1981, pp. 426-429; Florida DEP, 1982,
pg. 6-289).
b. If the basin is used as a sediment trap during construction, all sediment deposited during
construction must be removed before normal operation begins.
c. Aquatic vegetation should be .included'for a wetland type detention basin (Maryland
DNR, March 1987; Schueler, 1987, Chapter 4 and 9). A minimum ten foot wide shallow
sloped shelf is needed at the edge of the basin for safety and to provide appropriate
conditions for aquatic vegetation (Schueler, 1987). This shelf should be sloped 6:1 or
flatter and extend to a depth of 2 feet below the surface of the permanent pool (Shaver
and Maxted, DNREC, 1994). A list of suitable wetland species and propagation
techniques are provided in Schueler (1987) and Maryland DNR (1987).
d. An emergency drain (with a pipe sized to drain the pond in less than 24 hours) should be
installed in all ponds to allow.access for riser repairs and sediment removal (Schueler,
1987).
Table 1.1 Surface Area to Drainage Area Ratio For Permanent Pool Sizing For 85% Pollutant
Removal Efficiency in the Piedmont
% Impervious Permanent Pwl Denth (feet)
Cover 3.0 4.0 5.0 6.0 7.0 8.0 9.0-
10 0_59 OA9 043 0-35 0-31 0-29 0 ?.6
20 0.97 0.79 0.70 0.59 0.51 0.46 0.44
30 L34 1.08 0.97 0.83 0.70 0.64 0.62
40 1.73 1.43 1.25 .1.05 0.90 -0.82 0.77
50 2.06 1.73 1.50 1.30 ' 1.09 1.00 0.92
60 2.40 2.03 1.71 1.51 1.29 1.18 1.10
70 2.88 2.40 2.07 1.79 1.54 1.35 1.26
80 3.36 2.78 2.38 2.10 1.86 1.60 1.42
90 3.74 3.10 2.66 2.34 2.41 1.83 1.67
Notes: Numbers given in the body of the table are given in percentages.
Coastal SA/DA ratios can be obtained from the local DWQ Regional Office.
5
MV PPs -`2TAeri,o N
Project No.
a¢- 40,54 -

(to be provided by DWQ)
DIVISION OF WATER QUALITY - 401 WET DETENTION BASIN WORKSHEET
DWQStormwater Management Plan Review:
A complete stormwater management plan submittal includes a wet detention basin worksheet for each basin,
design calculations, plans and specifications showing all basin and outlet structure details, 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.
1. PROJECT INFORMATION (please complete the following information):
Project Name : M &KfL L5 5TA71,9h1 Sal 17l `/ 651 !D N
Contact Person: Ste-ve n M, Rie2, , F 6, Phone Number: ( Qty) A5¢ -e
,,0,Y1
For projects with multiple basins, specify which basin this worksheet applies to: PoN O $1 ?7
Basin Bottom Elevation 3 26 ft. (average elevation of the floor of the basin)
Permanent Pool Elevation 3 Z 9 ft. (elevation of the orifice invert out)
Temporary Pool Elevation 330.2 3 ft. (elevation of the outlet structure invert in)
Permanent Pool Surface Area 51`19 sq. ft. (water surface area at permanent pool elevation)
Drainage Area 9.5 ac. (on-site and off-site drainage to the basin)
hnpervious Area 2.5 ac. (on-site and off-site drainage to the basin)
Permanent Pool Volume q0$1 cu. ft. (combined volume of main basin and forebay)
Temporary Pool Volume `/ $o o cu. ft. (volume detained on top of the permanent pool)
Forebay Volume 2 0 5 8 cu. ft.
SA/DA used / 3 q (surface area to drainage area ratio)
Diameter of Orifice / , 3q in. (draw down orifice diameter)
II. REQUIRED ITEMS CHECKLIST
The following checklist outlines design requirements per the Stormwater Best Management Practices manual
(N.C. Department of Environment, Health and Natural Resources, November 1995) and Administrative Code
Section: 15 A NCAC 2H .1008. 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, attach an explanation of
why. n /
Applicant Initials S` ve , M. RsZe, pE. l% Kgi?i< ?Jl ty1GV)
The temporary pool controls runoff from the 1 inch storm event.
The basin length to width ratio is greater than 3:1.
The basin side slopes are no steeper than 3:1.
A submerged and vegetated perimeter shelf at less than 6:1 is provided.
Vegetation to the permanent pool elevation is specified.
An emergency drain is provided to drain the basin.
The permanent pool depth is between 3 and 6 feet (required minimum of 3 feet).
The temporary pool draws down in 2 to 5 days.
The forebay volume is approximately equal to 20% of the total basin volume.
Sediment storage is provided in the permanent pool.
Access is provided for maintenance.
A minimum 30-foot vegetative filter is provided at the outlet.
A site specific operation and maintenance (O&M) plan is provided.
A vegetation management/mowing schedule is provided in the O&M plan.
Semi-annual inspections are specified in the O&M plan.
A debris check is specified in the O&M plan to be performed after every storm event.
A specific sediment clean-out benchmark is listed (elevation or depth) in O&M plan.
A responsible party is designated in the O&M plan.
FORM SWG100 09/97 Page 1 of 1
WET [WETLAND] DETENTION BASIN OPERATION AND MAINTENANCE AGREEMENT
[Wetland maintenance wording is bracketed. Please modify the document as appropriate.]
K tz Klo5 5TATtot-1 taw o PF.W. Nto, o4 - ev2 4 Por jv .,an
The wet-fwe#Famel detention basin system is defined as the wets] detention basin, pretreatment
including forebays and the vegetated filter if one is provided.
Maintenance activities shall be performed as follows:
1. After every significant runoff producing rainfall event and at least monthly:
a. Inspect the wet {wetlamo detention basin system for sediment accumulation, erosion, trash
accumulation, vegetated cover, and general condition.
b. Check and clear the orifice of any obstructions such that drawdown of the temporary pool occurs within
2 to 5 days as designed.
2. Repair eroded areas immediately, re-seed as necessary to maintain good vegetative cover, mow
vegetative cover to maintain a maximum height of six inches, and remove trash as needed:
3. Inspect and repair the collection system (i.e catch basins, piping, swales, riprap, etc.) quarterly to
maintain proper functioning.
4. Remove accumulated sediment from the wet [wetla+?] detention basin system semi-annually or when
depth is reduced to 75% of the original design depth (see diagram below). Removed sediment shall be
disposed of in an appropriate manner and shall be handled in a manner that will not adversely impact
water quality (i.e. stockpiling near a wetivvetlandj detention basin or stream, etc.).
The measuring device used to determine the sediment elevation shall be such that it will give an accurate
depth reading and not readily penetrate into accumulated sediments.
When the permanent pool depth reads 0,'7-'5 feet in the main pond, the sediment shall be removed.
[For stormwater wetlands: if the elevation of the marsh areas exceed the permanent pool elevation, the
sediment should be removed to design levels. This shall be performed by removing the upper 6 inches of
soil and stockpiling it. Then the marsh area shall be excavated six inches below design elevations.
Afterwards the stockpiled soil should be spread over the marsh surface. The soil should not be stockpiled
for more than two weeks.]
When the permanent pool depth reads e, 7S feet in, the forebay [and micro-pool], the sediment shall
be removed_
BASIN DIAGRAM
(fill in the blanks)
0 Permanent Pool Elevation 32y
Sediment moval El. 3u? 75%
----------------------------------------------
B ------
=--------- ---- Sediment Removal Elevation 3Z4.1< 75%-Bottom Elevation ottom E vation $?.6 5%
32G o
FOREBAY MAIN POND
Page 1 of 2
5. Remove cattails and other indigenous wetland plants when they cover 50% of the basin surface. These
plants shall be encouraged to grow along the vegetated shelf and forebay berm.
[For wetlands: Wetland planting densities in the marsh areas should be maintained by replanting bare
areas as needed. Wetland plants should be encouraged to grow.in the marsh areas.]
6. If the basin must be drained for an emergency or to perform maintenance, the flushing of sediment
through the emergency drain shall be minimized to the maximum extent practical.
7. All components of the fwe*" detention basin system shall be maintained in good working order.
8. Level spreaders or other structures that provide diffuse flow shall be maintained every six months. All
..accumulated sediment and debris shall be removed from the structure, and a level elevation shall be
maintained across the entire flow spreading structure. Any down gradient erosion must be repaired and/or
replanted as necessary.
acknowledge and agree by my signature below that I am responsible for the performance of the seven
maintenance procedures listed above. I agree to notify DWQ of any problems with the system or prior to any
changes to the system or responsible party.

Note: The legally responsible party should not be a homeowners association unless more than 50% of the
lots have been sold and a resident of the subdivision has been named the president.
I,t-FYI t?,t G??m L?t h , a Notary Public for the State of N •?-?
County of W &Ke- , do hereby certify that OX-QA q 1G"Y'C
personally appeared before me this ' ON day of L ri and acknowledge the due
.execution of the forgoing wet [wetland] detention basin maintenance requirements. Witness my hand and
official seal,
AUBO '
SEAL
My commission expires 1-9:b` oup
Page 2 of 2
MORRIS STATION SUBDIVISION / ? / /? /
/
FUTURE TOWNHOMES
/ J POND "B" SCALE: 1"=100'
/_WIDS , i - -?- ,
•
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/ / / / / • . alp `??? ? ? • ?•?.?
Ole
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IN,
Morris Station Date: April 22, 2004
Rice & Associates Proj. # 03-047 By: Cameron Rice
Stormwater Calculations for Pond "B"
Multi-Family Section "B" (MF-B)
Calculate the surface area for a wet detention pond
Wet Detention Pond Calculations (NCDENR's Stormwater BMP, April 1999
Impervious Area = 29.4% (See Attachment "62" for calculations)
Permanent pool depth = 3.0 feet
Surface area/Drainage area ratio = 1.34 (From Table 1 .1, copy attached)
Site area = 8.5 acres
SA/DA = 1.34
SA = (1.34/100)*(8.5 acres) = 0.1 14 acres = 4,966 sf
Volume to be Stored from the 1" Storm
Runoff Coefficient (Rv) = Storm runoff (in) / Storm rainfall (in)
Percent Impervious (1) = Drainage area (ac) / Impervious portion of DA (ac.)
RV = 0.05 + .009 * (1)
= 0.05 + .009 * (29.4)
= 0.315 in/in
Vol. from 1" of Runoff = (Design rainfall) * (Rv) * (Drainage Area)
_ (1" ) * (0.315 in/in) * (8.5 ac.) * (1 ft/12in )* (43560 sf/ac.)
9,719 cf
Verify required surface area of pond
Area of permanent pool surface = 5,199 sf (normal water surface elevation, NSWE)
Area at NWSE > Required surface area
5,199 sf > 4,966 sf
Verify required volume to capture 1 " rainfall
Volume of permanent pool = 9,037 cf (normal water surface elevation, NSWE)
Elevation of permanent pool = 329
Volume of temporary pool = 9,800 cf
Elevation of temporary pool = 320.23
Volume provided > Volume Required
9,800 cf > 9,037 cf
Calculate Diameter of Orifice
G:\Projects\Mercury-Development\Morrisville_01-062\_WORD\Hydraulics\1-inch rain\Pond B.doc
Temporary pool volume = 9,800 cf
Height of temporary pool = 1.23 feet
Drawdown time = 2 days or 172,800 seconds
Flowrate = 9,800 cf /172,800 sec = 0.0567cfs
Orifice Coefficient = 0.6
Area = (Q/C)/sgrt(2*G*H)
= (0.0567/0.6)/sgrt{(2)*(32.2)*(1.23)}
= 0.0106 sf
= 1.53 sq in
Diameter = sqrt(area* 4)/rI
= sgrt{(1.53)*(4)/3.14}
= 1.39 inches
G:\Projects\Mercury-Development\Morrisville_01-062\_WORD\Hydraulics\1-inch rain\Pond B.doc
Morris Station Date: April 22, 2004
Rice & Associates Proi. # 03-047 By: Cameron Rice
Attachment "1132"
Impervious Calculations for Pond "B"
Multi-Family Section "B" (MF-B)
77,250 SF (UNITS & DRIVES)
26,322 SF (ROADWAY)
+ 5,054 SF (SIDEWALKS)
108,626 SF TOTAL IMPERVIOUS AREA
481,216 SF TOTAL
-111,999 SF (FUTURE 1-540 R/W)
369,217 SF NET AREA
29.4% IMPERVIOUS
G:\Projects\Mercury_Development\Morrisville_01-062\_WORD\Hydraulics\1-inch rain\B2.doc
3. General
a. Basin shape should minimize dead storage areas and short circuiting. Length to width
ratios should be 3:1 or greater. (Barfield, et al., 1981, pp. 426-429; Florida DEP, 1982,
pg. 6-289).
b. If the basin is used as a sediment trap during construction, all sediment deposited during
construction must be removed before normal operation begins.
c. Aquatic vegetation should be included for a wetland type detention basin (Maryland
DNR, March 1987; Schueler, 1987, Chapter 4 and 9). A minimum ten foot wide shallow
sloped shelf is needed at the edge of the basin for safety and to provide appropriate
conditions for aquatic vegetation (Schueler, 1987). This shelf should be sloped 6:1 or
flatter and extend to a depth of 2 feet below the surface of the permanent pool (Shaver
and Maxted, DNREC, 1994). A list of suitable wetland species and propagation
techniques are provided in. Schueler (1987) and Maryland DNR (1987).
d. An emergency drain (with a pipe sized to drain the pond in less than 24 hours) should be
installed in all ponds to allow Access for riser repairs and sediment removal (Schueler,
1987).
Table 1.1 Surface Area to Drainage Area Ratio For Permanent Pool Sizing For 85% Pollutant
Removal Efficiency in the Piedmont
% Impervious Perni2itient Pool Denth (feet)
Cover 3.0 4.0 5.0 6.0 7.0 8.0 9.0
in 0-49 043 0-35 0-31 0-29 0.26
20 0.97 0.79 0.70 0.59 0.51 0.46 0.44
30 L34 1.08 0.97 0.83 0.70 0.64 0.62
40 1.73 1.43 1.25 1.05 0.90 -0.82 0.77
50 2.06 1.73 1.50 1.30 ' 1.09 1.00 0.92
60 2.40 2.03 1.71 1.51 1.29 _ 1.18 1.10
70 2.88 2.40 2.07 1.79 1.54 1.35 1.26
80 3.36 2.79 .2.38 2.10 1.86 1.60 1.42
90 3.74 3.10 2.66 2.34 2.11 1.83 1.67
Notes: Numbers given in the body of the table are given in percentages.
Coastal SA/DA ratios can be obtained from the local DWQ Regional Office.
5
N[ o g g,K, d-KA-R,oH Pet-40 "C"
Project No. DWQ 4!:?* OOH (to be provided by DWQ)
DIVISION OF WATER QUALITY - 401 WET DETENTION BASIN WORKSHEET
DWQ Stormwater Management Plan Review:
A complete stormwater management plan submittal includes a wet detention basin worksheet for each basin,
design calculations, plans and specifications showing all basin and outlet structure details, 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.
L PROJECT INFORMATION (please complete the following information):
Project Name : h?f9(L1215 5?,?"?Ld? SU 6Di vI S let-1
Contact Person: sf evtn cG . PE. Phone Number: ( 11 -0,4,711
For projects with multiple basins, specify which basin this worksheet applies to: O N 17 '? G
Basin Bottom Elevation 3N. . 5 0 ft. (average'elevation of the floor of the basin)
Permanent Pool Elevation 3 1°I . S y ft. (elevation of the orifice invert out)
Temporary Pool Elevation 3 20 ? -7 0 ft. (elevation of the outlet structure invert in)
Permanent Pool Surface Area 5 6'1 S sq. ft. (water surface area at permanent pool elevation)
Drainage Area G • °o ac. (on-site and off-site drainage to the basin)
Impervious Area 1.117 ac. (on-site and off-site drainage to the basin)
Permanent Pool Volume °, ,010 cu. ft. (combined volume of main basin and forebay)
Temporary Pool Volume -7000 cu. ft. (volume detained on top of the permanent pool)
Forebay Volume G L I-) cu. ft.
SA/DA used I 3? (surface area to drainage area ratio)
Diameter of Orifice I 2 5 in. (draw down orifice diameter)
II. REQUIRED ITEMS CHECKLIST
The following checklist outlines design requirements per the Stormwater Best Management Practices manual
(N.C. Department of Environment, Health and Natural Resources, November 1995) and Administrative Code
Section: 15 A NCAC 2H .1008. Initial in the space provided to indicate the following design requirements have
been met and supporting documentation is attached. I fa requirement has not been met, attach an explanation of
why.
Applicants Initials ShebG!'1 In, (prof.lyt8?^)
The temporary pool controls runoff from the 1 inch storm event.
The basin length to width ratio is greater than 3:1.
The basin side slopes are no steeper than 3:1.
A submerged and vegetated perimeter shelf at less than 6:1 is provided.
Vegetation to the permanent pool elevation is specified.
An emergency drain is provided to drain the basin.
The permanent pool depth is between 3 and 6 feet (required minimum of 3 feet).
The temporary pool draws down in 2 to 5 days.
The forebay volume is approximately equal to 20% of the total basin volume.
Sediment storage is provided in the permanent pool.
Access is provided for maintenance.
A minimum 30-foot vegetative filter is provided at the outlet.
A site specific operation and maintenance (O&M) plan is provided.
A vegetation management/mowing schedule is provided in the O&M plan.
Semi-annual inspections are specified in the O&M plan.
A debris check is specified in the O&M plan to be performed after every storm event.
A specific sediment clean-out benchmark is listed (elevation or depth) in O&M plan.
A responsible party is designated in the O&M plan.
09/97 Page 1 of 1
WET [WETLAND] DETENTION BASIN OPERATION AND MAINTENANCE AGREEMENT
[Wetland maintenance wording is bracketed. Please modify the document as appropriate.]
M-dleQls SFWrlek (OWE p12-OJ• f4gol 04_t'V2> - PONo
The wet fwe0m4d] detention basin system is defined as the wet [wetland] detention basin, pretreatment
including forebays and the vegetated filter if one is provided.
Maintenance activities shall be performed as follows:
1. After every significant runoff producing rainfall event and at least monthly:
a. Inspect the wets] detention basin system for sediment accumulation, erosion, trash
.accumulation, vegetated cover, and general condition.
b. Check and clear the orifice of any obstructions such that drawdown of the temporary pool occurs within
2 to 5 days as designed.
2. Repair eroded areas immediately, re-seed as necessary to maintain good vegetative cover, mow
vegetative cover to maintain a maximum height of six inches, and remove trash as needed.
3. Inspect and repair the collection system (i.e. catch basins, piping, swales, riprap, etc_) quarterly to
maintain proper functioning.
4. Remove accumulated sediment from the wet fwetlamlJ detention basin system semi-annually or when
depth is reduced to 75% of the original design depth (see diagram below). Removed sediment shall be
disposed of in an appropriate manner and shall be handled in a manner that will not adversely impact
water quality (i.e. stockpiling neara wet iviellm el detention basin or stream, etc.).
The measuring device used to determine the sediment elevation shall be such that it will give an accurate
depth reading and not readily penetrate into accumulated sediments.
When the permanent pool depth reads 0,74j feet in the main pond, the sediment shall be removed.
[For stormwater wetlands: If the elevation of the marsh areas exceed the permanent pool elevation, the
sediment should be removed to design levels. This shall be performed by removing the upper 6 inches of
soil and stockpiling it. Then the marsh area shall be excavated six inches below design elevations.
Afterwards the stockpiled soil should be spread over the marsh surface. The soil should not be stockpiled
for more than two weeks.]
When the permanent pool depth reads D?y feet in the forebay [and micro-pool], the sediment shall
be removed.
BASIN DIAGRAM
(fill in the blanks)
V Permanent Pool Elevation 3 t°I.5
Sediment moval EL 311 •2S 75%
tom 1-75%
----------------- Sediment Removal Elevation 3I'!•2S Bottom E vation 3 IG•S 5% ------------------------------------------- ------
°
---Bottom Elevation
FOREBAY MAIN POND
Page 1 of 2
5. Remove cattails and other indigenous wetland plants when they cover 50% of the basin surface. These.
plants shall be encouraged to grow along the vegetated shelf and forebay berm.
[For wetlands: Wetland planting densities in the marsh areas should be maintained by replanting bare
areas as needed. Wetland plants should be encouraged to grow.in the marsh areas.]
6. If the basin must be drained for an emergency or to perform maintenance, the flushing of sediment
through the emergency drain shall be minimized to the maximum extent practical.
7. All components of the wet !vie detention basin system shall be maintained in good working order.
8. Level spreaders or other structures that provide diffuse flow shall be maintained every six months. All
accumulated sediment and debris shall be removed from the structure, and a level elevation shall be
maintained across the entire flow spreading structure. Any down gradient erosion must be repaired and/or
replanted as necessary.
acknowledge and agree by my signature below that I am responsible for the performance of the seven
maintenance procedures listed above. I agree to notify DWQ of any problems with the system or prior to any
changes to the system or responsible party.
Print name: (f r.4 4 1,an4
Title am d De[[voe?aadri?f 0r,vd ??9viS?'a<?ohs
Address: FprH.4- ?i1/?STfrli?S??Y'rfo?J?S, 3 /QtgGnt y PA-A,4. , ,Svil4 ';t: r.eo?, ry, NG 275<I
Phone: l9? ' a7z e5
Signature:
7' 7
Note: The legally responsible party should not be a homeowners association unless more than 50% of the
lots have been sold and a resident of the subdivision has been named the president.
I, c(C t ?ltY?'u , a Notary Public for the State of
County ofd r?\r do hereby certify that Oxed I-arl
personally appeared before me this LU day of iri , and acknowledge the due
execution of the forgoing wet [wetland] detention basin maintenance requirements. Witness my hand and
official seal,
QQ;.:?OTAR
Y
11//Z cou'?4
//1111 111111\
My commission expires-
SEAL
00 (0
Page 2 of 2
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MORRIS STATION SUBDIVISION
FUTURE TOWNHOMES
POND "C"
SCALE: 1"=100'
Ae
20_FOOT BUFFfR
i
1
i
Morris Station Date: April 22, 2004
Rice & Associates Proj. # 03-047 By: Cameron Rice
Stormwater Calculations for Pond "C"
Multi-Family Section "C" (MF-C)
Calculate the surface area for a wet detention pond
Wet Detention Pond Calculations (NCDENR's Stormwater BMP, April 1999
Impervious Area = 28.9% (See Attachment "C2" for calculations)
Permanent pool depth = 3.0 feet
Surface area/Drainage area ratio = 1 .34 (From Table 1. 1, copy attached)
Site area = 6.8 acres
SA/DA = 1.34
SA = (1.34/100)*(6.8 acres) = 0.091 acres = 3,969 sf
Volume to be Stored from the 1" Storm
Runoff Coefficient (Rv) = Storm runoff (in) / Storm rainfall (in)
Percent Impervious (1) = Drainage area (ac) / Impervious portion of DA (ac.)
Rv = 0.05 + .009 * (1)
= 0.05 + .009 * (28.9)
= 0.310 in/in
Vol. from 1 " of Runoff = (Design rainfall) * (Rv) * (Drainage Area)
(1 " ) * (0.310 in/in) * (6.8 ac.) * (1 ft/12in )* (43560 sf/ac.)
= 7,652 cf
Verify required surface area of pond
Area of permanent pool surface = 5,675 sf (normal water surface elevation, NSWE)
Area at NWSE > Required surface area
5,675 sf > 3,969 sf
Verify required volume to capture 1" rainfall
Volume of permanent pool = 9,020 cf (normal water surface elevation, NSWE)
Elevation of permanent pool = 319.50
Volume of temporary pool = 7,800 cf
Elevation of temporary pool = 320.70
Volume provided > Volume Required
7,800 cf > 7,652 cf
Calculate Diameter of Orifice
G:\Projects\Mercury-Development\Morrisville_01-062\_WORD\Hydraulics\1-inch rain\Pond C.doc
Temporary pool volume = 7,800 cf
Height of temporary pool = 1.2 feet
Drawdown time = 2 days or 172,800 seconds
Flowrate = 7,800 cf /172,800 sec = 0.0451 cfs
Orifice Coefficient = 0.6
Area = (Q/C)/sgrt(2*G*H)
= (0.0451 /0.6)/sgrt{(2)*(32.2)*(1.2)}
= 0.0086 sf
= 1.24 sq in
Diameter = sqrt(area* 4)/I1
= sgrt{(1.24)*(4)/3.14}
= 1.25 inches
G:\Projects\Mercury-Development\Morrisville_01-062\_W0RD\Hydraulics\1-inch rain\Pond C.doc
Morris Station Date: April 22, 2004
Rice & Associates Proi. # 03-047 By: Cameron Rice
Attachment "C2"
Impervious Calculations for Pond "C"
Multi-Family Section "C" (MF-C)
60,255 SF (UNITS & DRIVES)
21,460 SF (ROADWAY)
+ 4,010 SF (SIDEWALKS)
85,725 SF TOTAL IMPERVIOUS AREA
340,759 SF TOTAL
- 45,555 SF (FUTURE 1-540 R/W)
295,204 SF NET AREA
28.9% IMPERVIOUS
G:\Projects\Mercury_Development\Morrisville_01-062\_WORD\Hydraulics\1-inch rain\C2.doc
3. General
a. Basin shape should minimize dead storage areas and short circuiting. Length to width
ratios should be 3:1 or greater. (Barfield, et al., 1981, pp. 426-429; Florida DEP, 1982,
pg. 6-289).
b. If the basin is used as a sediment trap during construction, all sediment deposited during
construction must be removed before normal operation begins.
c. Aquatic vegetation should be included for a wetland type detention basin (Maryland
DNR, March 1987; Schueler, 1987, Chapter 4 and 9). A minimum ten foot wide shallow
sloped shelf is needed at the edge of the basin for safety and to provide appropriate
conditions for aquatic vegetation (Schueler, 1987). This shelf should be sloped 6:1 or
flatter and extend to a depth of 2 feet below the surface of the permanent pool (Shaver
and Maxted, DNREC, 1994). A list of suitable wetland species and propagation
techniques are provided in. Schueler (1987) and Maryland DNR (1987).
d. An emergency drain (with a pipe sized to drain the pond in less than 24 hours) should be
installed in all ponds to allow.access for riser repairs and sediment removal (Schueler,
1987).
Table 1.1 Surface Area to Drainage Area Ratio For Permanent Pool Sizing For 85% Pollutant
Removal Efficiency in the Piedmont
% Impervious Permanent Pool Denth (feet)
Cover 3.0 4.0 5.0 6.0 7.0 8.0 9.0
10 0. -5 9 0-49 043 0-35 0-31 0-29 0:26
20 0.97 0.79 0.70 0.59 0.51 0.46 0.44
30 1.34 1.08 0.97 0.83 0.70 0.64 0.62
40 '1.73 1.43 1.25 .1.05 0.90 -0.82 0.77
50 2.06 1.73 1.50 1.30 ' 1.09 1.00 0.92
60 2.40 2.03 1.71 1.51 1.29 1.18 1.10
70 2.88 2.40 2.07 1.79 1.54 1.35 1.26
80 3.36 2.78. 2.38 2.10 1.86 1.60 1.42
90 3.74 3.10 2.66 134 2.11 1.83 1.67
Notes: Numbers given in the body of the table are given in percentages.
Coastal SA/DA ratios can be obtained from the local DWQ Regional Office.
O
vgArFR
QG
Michael F. Easley, Governor
William G. Ross Jr., Secretary
North Carolina Department of Environment and Natural Resources
Alan W. Klimek, P.E., Director
Division of Water Quality
Coleen H. Sullins, Deputy Director
Division of Water Quality
April 26, 2004
Project Name: Morris Station
Wake County
EXPRESS REVIEW ACCEPTANCE LETTER
Fortis/Westminister Homes
Attn: Craig Lang
3500 Regency Pkwy., Suite F
Cary, NC 27511
Fax #: S&EC 919-846-9467
Subject Property: West of Hwy 54 and SR 1637, South of proposed I-540, East of Davis Drive and
North of SR 1635
Dear Mr. Lang:
On April 23, 2004, the Wetlands/401 Unit of the Division of Water Quality received a Fax/email request
from Soil & Environmental Consultants regarding a project known as "Morris Station" for acceptance
into the Express Review Program. This letter advises you that your project will be accepted into the
Express Review Program once the following items are received: 1) a fee of $1,000.00 made payable to
the North Carolina Division of Water Quality, 2) five complete and collated copies of the application
and 3) five copies of all additional information pertaining to this project. Thank you for your attention
to this matter.
Please keep in mind that the clock for this project will not start until receipt of the completed application
package and required fee are received.
If you have any questions or wish to discuss these matters further please do not hesitate to call John
Dorney at 919-733-9646 or Deborah Edwards at 733-9502.
Sincerely,

Alan W. Klimek, P.E., Director
cc: Steve Mitchell- DWQ Regional Office
File copy
Central Files
Kevin Martin - S& EC
N. C. Division of Water Quality, 401 Wetlands Certification Unit,
1650 Mail Service Center, Raleigh, NC 27699-1650 (Mailing Address)
2321 Crabtree Blvd., Raleigh, NC 27604-2260 (Location)
[phone] (phone), 919-733-6893 (fax), (http://h2o.enr.state.nc.us/ncwetlands)
Customer Service #: 1-877-623-6748

F W ATE nrrsaw r. r<?ary, c ..m«
O'er 9?G N.urh Caaoaaa nep ttmenr of nu?L«wuN VNNarun?l RCw ?m
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? _ nl,ig?on rwmn p.amy
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EXPRESS PERMIT REVIEW PROGRAM
Division of Water Quality
Department of Environmental and Natural Resources
Wetlands/401 Unit
Street Address: 2321 Crabuee Boulevard, Suite 250
Raleigh, NC 27604-2260
Mailing Address: 1650 Mai] Service Center
Raleigh, NC 27699-1650
Contactlnformation: Phone: [phone]
Fax 0, 919-733-6893
Fax To: Kevin Martin Fax #: [phone]
Subject: Mortis Station Date: 4/26/04
Number of pages including cover sheet: 2
Notes or special instructions:
'Eae otiginal will be sent in the [nail. 1f you have questions please call Debbie Edwards at 919-733-9502.
AWA
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N.l-.lliviuond Warm Qmary.461 WQa &CwflMdou Unit
165035ai11e.ire C-Rakig3. NC 2 7 69 9-165 0 (NUft ?htm)
2321 (AUme Blv&. &&itit. NC 77604.160 (1-0-)
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NOINEROO ONIMS
FACSIMILE SHEET
FAX NO. (919) 846--9467
DATE:2 i
l? US
TO: NAME:
COMPANY:
FAX NUMBER:
l ` 4
FROM: KQ vJ71?I Cpl lit l/I SUBJECT: &OyrtSS P d' ?QVZ?GcJ
The following items are being faxed. Number of pages including transmittal sheet:
For Your Comments /Approval
Per Our Conversation
Please Advise
Would Like To Discuss
HARD COPY SENT:
US Regular Mail
Overnight
IF YOU HAVE ANY P OBLEMS WITH THIS TRANSMISSION, PLEASE
CONTACT AT [phone].
CONFIDENTIALITY NOTICE*
This transmission is intended only for the use of the individual or entity to which it is addressed and may contain
information that is privileged and confidential. If the reader of this message is not the intended recipient, you are hereby
notified that any disclosure, distribution or copying of this information is strictly prohibited. If you have received this
transmission in error, please notify us immediately by telephone and return the faxed documents to us at the above address
via the United States Postal Service.
Environmental Consultants, PA
Road • Raleigh, North Carolina 27614 • Phone: [phone] • Fax: [phone]
www.SandEC.com
Project Number: 9ho4 W1
CC: ( CLU
For Your Information
Per Your Request
Please Call
Please Handle
Hand Delivery
No Hard Copy Sent
Charlotte Office:
236 LePhillip Court, Suite C
Concord, NC 28025
Phone: [phone]
Fax: [phone]
Greensboro Office:
3817-E Lawndale Drive
Greensboro, NC 27455
Phone: [phone]
Fax: [phone]
Hickory Office:
622 Coon Mountain Lane
Taylorsville, NC 28681
Phone [phone]
Fax: [phone]
o o be Almb'ba
INITIAL INTEREST IN PARTICIPATION IN THE EXPRESS PERMITTING PROGRAM
FOR THE 401 WATER QUALITY CERTIFICATION,
ISOLATED WETLAND PERMITTING
OR STREAM ORIGIN DETERMINATION PROGRAMS
February 25, 2004
Version 2
Applicant Name: Fortis/Westminister Homes Attn: Mr. Craig Lana
Applicant Address: 3500 Regency Pkwy Suite .-F
Cary, NC 27511
Applicant's phone number: g i 9-4_6-2-on7n Fax number:
Applicant's email address:
Consultant Name (if applicable): Soil & Fnvi ronm n .a1 onsul an .s, PA
Consultant address (if applicable): 11010 Raven Ridge Road
Consultant's phone number: X11 A - R 4 Fi - 5 g n n Fax number: g 1 A - $ 4 Fi - X14 Ci 7
Consultant's email address: [e-mail]
Type of action requested under the Express Review Program (check all that apply):
IN 401 Water Quality Certification
? Isolated Wetland Permit
? Riparian Buffer Approval
? Stream Origin Determination
n # of Determinations Requested
Name of Project: M n r r i G Station
Property size (acres)
178
County: Wake
Nearest named stream (from USGS topo map): Kitt C r e e k
Please provide a brief description of this project (attach site plan if available):
Residential subdivision with associates streets and utilities-
Please attach a map of site location using USGS 1:24,000 map and county soil survey.
1
Location of project site - please include reference to the county, nearest name town and highway number:
West of Hwy 54 and SR1637 (Church Street) south of proposed
Northern Wake Expressway (I540) east of Davis Drive (SR1613)
and north of SR1635 northwest of Morrisville.
Proposed impacts: 0.09 Acres of wetlands
0 Acres of isolated wetlands
279 Linear feet of streams
n Linear feet of isolated streams
Square feet of protected stream buffers
Has consultant or applicant attended any DWQ-sponsored training sessions in the past two years? If so,
please list which ones. l4j1/nj Fxl,ress Re-view Pirmi+- Training-MicKimmon Ctr.
Which other environmental permits will be needed for this project? Please list them below:
Corps 404 (this has already been approved) and Sediment and
Erosion Control
Does this project require approval under the State Environmental Policy Act or National Environmental
Policy Act? No
Does this project require approval of a Variance from the NC Environmental Management Commission"
No
Are you aware of any local controversy concerning this project? If so, please describe the controversy and any
measures that have been taken with respect to public involvement.
No
This form must be submitted via email (c/o 40learess&cmail.net), fax [phone]) or hand-delivered
(Parkview Building, 2321 Crabtree Blvd., Raleigh, NC 27604) within the first three (3) working days of the
month for the first three months of the Express Review Program (until January 1, 2004). Application
procedures after that time will be provided at a later date. Applicants who are selected to participate in the
Express Review Program will be notified via email or fax with one additional working day. Successful
applicants will then be instructed regarding detailed procedures for full application. Unsuccessful applicants
will be queried to determine if they want to be in the following month's selection process or whether they
want to follow the normal application process.
Please contact John Dorney at 919-733-9646 if you have any questions regarding this form.
2
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EXPRESS REVIEW SCHEDULE
PROJECT NAME: cy-\ DWO##:
ExP
ACTION
Acceptance letter
Application received
Initial review/letter
DATE
q12J(,q
CQ 3 0H
Information received
Field Meeting
Additional information letter
Information received
Office Meeting
Additional information letter
Information received
Expiration
Issued/Rejected (circle one)
04-0679
1
SOIL & ENVIRONMENTAL CONSULTANTS, PA
NC Division of Water Quality
Tran # Invoice Type Date Reference
3247 060304 Invoice 06/03/04 8464.W1
Date: 06/03/04
Balance
$1,000.00
% P
C'? °o ty/ .
U} O
iUj
016755
Check Number: 16755
Check Amt: $1,000.00
Discount Pay Amount
$0.00 $1,000.00
d Complete items 1, 2, and 3. Also complete
Item 4 if Restricted Delivery is desired.
0 Print your name and address on the reverse
so that we can return the card to you. ".
¦ Attach this card to the.back of the mailplec
or on the front if space permits.
t. Article Addressed to: 14

Rice and Associates v
L
978 Trinity Road y
Raleigh, NC 27607 •
4

DWQ# 04-0679 - Wake V

I
A. Signature
Xyut0lti.+j•/?JY.e._.? Agent
?
Addressee
8. Received by (Printed Name) I C. Date of Delivery D. Is delivery address different from item 1? ? Yes
%, If YES, enter delivery address below: ' ? No
3. Service Type
Certified Mail Cl Express Mail
? Registered R Retum Receipt for Merchandise
? Insured Mail ? C.O.D. I
4. Restricted Delivery? (Extra Fee) ? Yes
cleNgmyer' `I 7001 1140 0002 3715 0020
Infer from service /abeq 1- _- - _ _ ------- ---- -
904-_?._._?_
V09LZ ON `q INE-a
OSZ almS `p.renainog aaalgszZ) IZ£Z
ltun uotlsogP100 susIla
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0? -J 'ON l!uaaad -
Pled feagge%jolz 8.L8, 3
I1e1N sseio-}sai3 30Ini13S ld190d 631VIS 4311Nn
¦ Complete items 1, 2, and 3. Also complete A.
item 4 if Restricted Delivery is desired.
¦ Print your name and address on the reverse
so that we can return the card to you. 'B!
¦ Attach this card to the back of the mailpiece, PON
or on the front if space permits. 0000 a
1. Article Addressed to:
Fortis/Westminister Homes
3500 Regency Pkwy, Suite F
Cary, NC 27511
DWQ# 04-0679 - Wake J
Article Number
,nsfer from service 14150
? Agent
? Addre
Name C. . D? e)jvdr
Mrs tpdO
live address different from Item 1' Yesgem Yes
enter delivery address below: ? No
VN
Service Type
I5(_Certified Mail ? Express Mail
? Registered Return Receipt for Merchandis
? Insured Mail ? C.O.D.
4. Restricted Delivery? (Extra Fee) ? Yes
7001 2510 0006 3167 5848
4Ci 1 r..ti.. -, onnn. nnmoetin RAbirn Reneint 10259 -1
UNITED STATES POSTAL SERVICE
First-Class Mail
Postage & Fees Paid
LISPS
Permit No. G-10
• Sender: Please print your name, address, and ZIP+4 in this box •
NC DENR Division of Water Quality
Wetlands/401 Certification Unit
2321 Crabtree Boulevard, Suite 250
Raleigh, NC 27604
G?I0G,?G3!]?3 ?4La400Gv] ?MC3DD?I??00[?l LL
CJOO RG30II1r/066Q, G+IOO R4a 6G?RO0 60gL.1
990OD&VT 192KM0MDCT@
TOTALS
WETLAND IMPACT 3,924 SF
i

6L9p.+t0 ?
0 STREAM IMPACT 279 LF
CIVI L
ENGINEERING,
PLANNING
&SURVEYWG
1 978 TriniW Road
Raleigh, North Carolina 27607
RICE & Voi?:919.854.0811
F,,-'919.854.0812 919.854.0812
SHEET NO. IE.0.0 JANUARY 15,2004 ASSOCIATES genmail@riceassodatesnet
SHT IE.4.0 o GRAPHIC SCALE 200 400 800
SHT IE.5.0 ( IN FEET )
SHT I E.6.0 1 inch = 400 ft.
VICINITY MAP
NOT TO SCALE

° IMPACT LENGTH; 11?"{;F•
,h10
REINFORCED CONCRETE
RETAINING WALL
PROPOSED SILT FENCE
PROP, RIP-RAP\
APPRON
. ? I
WISN 000
I 349 • SISN 000
,REINFORCED CONCRETE
RETAINING WALL
x1p
SISN' 101
IMPACT LENGTH: 39 LF
A. ' Y
4f,
ISN 101
(PACT AREA: 1,916 S
Rp q
4?5 "yo
& 60
M?M W
CIVI L
ENGINEERING,
PLANNING
& SURVEYING
978 Tliniiy Road
0 G10 20 RAPHIC SCALE 40 Raleigh, North Carolina 11607
RICE & Voice: 919.854.0811
( IN FEET) fax [phone]
inch = 20 ft. ASSOCIATES [e-mail]
SHEET NO. IE.1.0 JANUARY 15, 2004
EA
350
345
FINISH GR ADE CENTERLINE OF ROAD
PROPOSED CATCH
ASIN
PRPOSCO
"
?
Olp
-
w
AI
-R(INf

-? EXISTING GRADE OFFSET ELEVATION
I
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Of
EXI TING GRADE OFFSET ELEVATION
(27, 5' LEFT OF CENTERLINE)
PROP,
!Y TO BE " RCP CULVERT
LACED 0.8' BELOW EXISTING
GRADE TO PROVIDE AQUATIC LIFE SCALE:
PASSAG E
" HORII:1 ° = 20'
PROP, RCP CULVERT
INV IN- 4
E
: HORIZ
l ° = 21
INV OU (EX. GR DE
353.50)
: 345
50 :
J LENGTH 61,50'
EXISTING CENTERLINE GRAD SLOPE; 1,58Y
MASON FARM ROAD PROFILE
SHEET NO. IE.2.0
9+00
JANUARY 15, 2004
K-j

345
9+50
CIVIL
ENGINEERING,
PLANNING
& SURVEYING
978 Trinity Road

RICE & Raleigh, North Carolina 27607
Voice: 919.854.
81
1

ASSOCIATES
x 919.8540
2
fa
genmail@riceassodatesnet
4
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END 117
STA: 10+0 0
INV. IN: 3 45,50
345.5
RIGHT-0 -WAY

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RIGHT-C F-WAY
END 1 17A
STA: 1 +61.50
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352.7 O
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353.4
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SHEET NO. IE,3.0 JANUARY 15, 2004
SCALE:
HORI1:1" = 20'
HORIt:1" = 2'
!I I
I&A
RICE &
ASSOCIATES
CIVI L
ENGINEERING,
PLANNING
&SURVE%G
978 Trinity Road
Raleigh, North Carolina 27607
Voice: 919.854.0811
Fat 919.854.0812
genmail@riceassoaates..net
I „ „ •, "/ EXISTING WETLANDS
\\/ REINFORCED CONCRETE
J. j WISN 102
OUTLET STRUCTURE
44
IMPACT AREA; `2,008 SF
REINFORCED CONCRETE
RETAINING WALL
,
M? 181 0010
SISN "103 ?? a 4
IMPACT' LENGTH; 127 LF
REINFORCED CONCRETE' ;
RETAINING WAl`L' o= \
EXISTING aWETLANDS-^?,'< ?; i ?'?.?'. ??
?,° ?'" • PROP, RIP-RAP PRQPOSED SILT -FEN
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CIVIL
•;p rt <<°?,•. ' Sao ••
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' 978 TriniI Road
GRAPHIC SCALE Raleigh, North Carolina 27607
° '° 20 4° RICE &
Voice: 919.854.0811
L-AWL ( IN FEET ) S Fax: [phone]
1 inch = 20 ft.

......... ASSOCIATE genmad@nceassouatesnet
SHEET NO. IE.4.0 JANUARY 1 5, 2004
330
325
320
315

FINISH GRADE C ENTERLINE OF ROAD
PROPOSED CATCH BASI

PRPOSED 8" DIP WA1E R

C
D I ?AP

J EXISTING GRADE OFFSET ELEVATION
?(27,5' LEFT OF CENTER LINE)
EXIS TING GRAC E OFFSET ELEVATION
(27. RIGHT F CENTERLINE)
M OP. 72" RCP CULVERT
T BE PLACED 1,0' BELOW EXISTING
G ADE TO PROVIDE AQUATIC LIFE SCALE:
A P SSAGE

RCP
48
" TIES '

?. r

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HORI1:1" = 20'
CULVERT
IN TO
72 IN GRADE
V
315.34 E
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316.
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(EX
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OUT:
U 'NGTH: 67.38 LF
EXISTING CENTERLINE G RADE r S OPE: 0.5%

19+50
EVERETE FIELD ROAD PROFILE
K#
325
320
315
SHEET NO.IE.5.0
Nv
I
RICE &
ASSOCIATES
CIVIL
ENGINEERING,
PLANNING
& SURVEYING
918 Trinity Road
Raleigh, North Carolina 21601
Voice: 919.854.0811
Fax: [phone]
[e-mail]
JANUARY 15, 2004
)
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CONCRETE

RETAINING WALL -PR OPOSED 5" RC
PRO OSED 8' DIP
WAT RLINE
LEN = 67.38
SLOPE = 0.50
EXISTING GRADE
. . _ REIN ORCE
CON RETE
72" DI A RCP OUT ET
STRU CTURE

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10+00

11+00
0
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330
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320
310
Townhouse Lots -Impervious Area Assumptions
REVIEW REVISIONS
Townhome Section "A" Impervious Area Square Footage
Average Unit Footprint 1,125
10' x 12' deck 120
10' x 21' drive 210 I
4' x 15' sidewalk 60 II II
Total Im ervious Area Per lot 1,515 P ~
fONSTRUCfION REVISIONS
Total # of Lots 36 59,085 SF (UNITS & DRIVES) `1
21,110 SF (ROADWAY) }
Total Im ervious Area for Townhouse Lots 54,540 SF + 3 935 SF (SIDEWALKS)
84,130 SE TOTAL IMPERVIOUS AREA
328,117 SF TOTAL
Townhome Section "B" Impervious Area Square Footage II II - 45 555 SF FUTURE I-540 R~W~
282,562 SF NET AREA
l
Average Unit Footprint 1,125 75,750 SF (UNITS & DRIVES) o 29.8/o IMPERVIOUS
10' x 12' deck 120 26,322 SF (ROADWAY)
210 + 5 054 SF (SIDEWALKS 1 10' x 21' drive 107 126 SF TOTAL IMPERVIOUS AREA PRO6a~pTE TOGA D0~
4' x 15' sidewalk 60
Total Impervious Area Per Lot 1,515 462,641 SF TOTAL . ~ • ~ - • i ; ~
-111 999 SF FUTURE I-540 R W ~ ~ ~ i J . ~ ~ 97
Total # of Lets 50 350,642 SF NET AREA / • ' ~ ,o
1 • ~ r \ J 99 9P;
vious Area for 62' Wide Lots 75 750 SF 30.6% IMPERVIOUS . ~ ~ ' J • ~ \ Total Im er• , ~ _ . ~ • ~
/ /1 \ ~Bn~l / . ~ ,o~
5 G~ 1 / 0 I ~-~c 1a
~ ~ ` . Townhome ection "C" Impervious Area Square Footage ,PPS°+ a .
_ ~,aP \ / r~ti .I ~ ~ ~ m
Avera e Unit Foo not 1,125 ~ \ c ~ ~
9 tp ~ ~ / ~ ~ 109 it
10 x 12 deck 120 Il / r , ` ~ / ~ 12 ,J
10'x21'dri'e 210 i? 1 ~ ~ ~ 12 26 110 r I ~ ~ 12 08
4' x 15' side' alk 60 ~ ~ 1 12 I ~ 12
• I ~ Total Impervious Area Per Lot 1,515 . ~ 13 122 ~ t0 I I ' 121 tll
• ~
Total # of Lots 39 ~r. ~ ~ ~ ~ ~ ~ it ~ 14 ~ 10 1 ~ ,7 0 ~ I ' 4 112 10
• d \ ,
Total Im etvious Area for 62' Wide lots 59,085 SF ~ , ~ i~ 141 , II 13 O ~ I 12 I I o ~ tt3
~ ~ i ~
~ ~ ~ ,4 WIDE L 151 ~ ~ i7 119 114
4 ~ Total Im a ious Area for All Townhome Lots 189,375 SF 'S ~ 5 ~ ~
IJ 15 ~2 ~ ~ 134
5 I 14 i 116 115 13
' 35 14
• E~ I ~ ~ 2s 14 ,17 918 Tani Road 0 0 ~ 2 ~ 4 ~ 25 ~ ~ a ,4 0
• ~ ~ ~ ~ 28 23 ,3 Ralei h, North Carolina 21601 0 2 I ,7 9 ~ ~ 1
61 ~ 31 ~ ~ 116 0 31
a J, ~ 0 az . ~ 5 Voice: 919,854.0811 32 O 6 221 ~ 0
IIAII ~ 0 ~ ~ ~ 4 19 _ ~ ~ o fax: [phone] ~ t
A M E TW 3 15 ,5 ~~5 I ~ ~ [e-mail] ~ ~ I 0 ,5 ~ I 0 ~
_ o ~ 1B ~ ~ 0 ~ _ , 'i ~ O r ~ ~~aua~
Y' ~ ~ R „IFS M • ~ 361 ~ fi I 0 ~ ~ I ~ a E ~ ~ / ~ ~ " ~ iq,~
22,799 SF (ROADWAY) W + 4 210 SF SIDEWALKS) 1 's ~ ~ , ENm 62 ~ ~ ~ O CARS ~4 p ~E 15 1p O~ nose eeeoo ,I I N,
~ D 81,549 SF TOTAL IMPER\!lOUS AREA r~ ~ ~ o ~ I 93 I 60 ~ eoo E$$~ ooe ~ ~I 0 ~ 63 i e o Q~~~ e i
• ~ ~ ~ ~ 4~ Z ~ 2, I 15 16 15 92 ~ ~ ~ o a i 2, 159 SEAL
403,860 SF TOTAL ~ ~ ~ ~ 66 16; i e 0 o /o a
-133 677 SF (FUTURE I-540 R W ~ Z' 4z 0 '.~a 91 ~ ( i 8LJ~ o i ~ 58 I i o ;
270,183 SF NET AREA ® ~ ~ 23~ 6 i 16 17 I6 FNCIN6ER ; Q 4 18 0 90 O ~I U o0oeeeeoo°o v
~ ~ ~4, ~ ~ ~ ~ ~ o , ~ 86 57 19 ,~j
30.2% IMPERVIOUS ~ I ~ ~ 2]1 0 89 ~ O O ,I~~ i6 56 16 67 19
° ~ ~ 0 ,d 211 i PP ~ ( 04-01-04 741 ~ 0
~ Single-Family Lots -Impervious Area Assumptions ,B 90 91 z, 6 ~ i6 C~ 55 20 265' CAROLINA POWER ~ 16
o ~ ,e 0 0 19 ANO LIGHT EASEMENT I 97 ~ 69 54 21
~ 18 ,9 ~ I6 10 8fi ` O o O (
60' & 62"Wide Lots Impervious Area Square Footage 1a 19 O 184 18 ,9 70 53 22 OI IV 0 B5 i` o
M 18 18 3 71 52 0
~ House (see note below) 1,880 18, ,9 64 23 VS 1, 1I~S VC 19 ~ 88 6 1 I ~ / 72 51
10' x 12' deck 120 'a x ~ ~ 0 24 i 83 o 3500 Re eacy Parkway ~ I ~ 9 ~7 291 \ 73 /
v ~ ~ ~ cv 20 x 30 drive 600 17P1 I I I 56 - Suite f
~ • 60 ~ o, 4 x 15 sr ewalk ~ ~ i I 74 ~ 49 (a , NC 21511 IELT o ry 2
3 ~ Total Im ~rvious Area Per Lot 2,660 ~ "s P 7 • 3< I ~M~~ 75 34 ~ O ~ 4B
v ~ I ~I Q~qy
~ Total # of''Lots 305 ~ UI ns m 9 ' 76 ~ 47 ~ n I /
N ~ I • I. i 97 I O / 46 Z6
0 Total Im ervious Area for 60' Wide Lots 811,300 SF ~ Q ~ > ~ LT WIDE ~ ,8 ~ ~ gyres
w d • is 45 3J 9~ ~9 0 0 26 ~
~ I I 0 ' 7g /
~ 79' Wide ots Im ervious Area S ware Foota a 169 68 ~ p g g 0 0 B2 ~ 44 ~ ~ 0 27 -
~ /
48' x 48' fjouse 2,304 31 o ~ ~ 81 ~ rch tr t & 43 28 Chu See 311 `
a ~ ~ ' ~ ~ ~ ~ 05 ~ ~ ~ Weaver Road ~ ~ ~ ~
10' x 12' deck 120 ~ ~ o ~ N ? ~ ~ ~ ~ ~ ~ ~ Town of Morrisville NC o ~ '
t 20' x 30' drive 600 32 ~ 30 ~
~ ~ ~ • 60 ~ ,4 ~ 4 x 15 sidewalk 3, 3, ~ iy, ~ ~ 42 ~ . i I
3 084 'Z U Total Imp~rnous Area Per Lot , i 31 ~ I i 7,
> ~ orris a ion
72 ~ ~ Total # of Lots ,z, 32 31 ~ 41 72 ~ ~ ,6 . 31 7A ' I 11'' CC
19 1 / 39 V ItIVIU~ 31 t I ~ }7
z Total Im envious Area for 79' Wide Lots 222,048 SF 31 W 1! ~ J ~ 36
W z i~
w z Total Im ervious Area for All Sin le Famil Lats 1 033,348 SF 33 CONSTRUCTION 0 E-fAIVIILY E I N
0 IN l PLAN s 76
Z RY - IMP R 3 °,033,348 SF (UNITS & DRIVES)
R&A PROD. #02-012 +933 609 SF (ROADWAY & SIDEWALK} ~
~i d 62' wide lots based on an avera a of various tans ~ Note: Squbre footage of house for 60 an g p
N '0 of ro os d roduct e rovided b builder. AREAS TOWNHOMES SINGLE-fAMIIY ENTIRE SITE o PPP h'PP Y `,966,957 SF TOTAL IMPERVIOUS AREA
o '
li TOTAL AREA 903,387 SF 6,582,554 SF 7,485,941 SF h 4 TOTAL AREA ~~,582,55 ~
o GRAPHIC SC NC GRID
'E IMPERVIOUS AREA 272,805 SF 1,966,957 SF 2,239,762 SF 0 29.9 /o IMPERVIOUS 0 100 200 400
PERCENT IMPERVIOUS 30.2 29,9 29.9 APRIL 23, 2004 ( IN FEET )
1 inch = 200 f{.
Q
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in
u a~
IMPERVIOUS AREA EXHIBIT
L ~i
0 a
i

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~ • 359.0 / :370 2 r F.
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