HomeMy WebLinkAbout20091346 Ver 6_Stormwater Approval_20151009AMENDMENT TO PREVIOUSLY APPROVED
STORMWATER IMPACT ANALYSIS
HOLLY SPRINGS TOWNE CENTER — PHASE 2
WC]"031101]
HOLLY SPRINGS, NORTH CAROLINA
DATE: JUNE 2015
PREPARED FOR:
KRG NEW HILL PLACE, LLC
30 SOUTH MERIDIAN STREET, SUITE 1100
INDIANAPOLIS, INDIANA 46204
'J
McADAMS
Raleigh /Durham ■ 2905 Meridian Parkway ■ Durham, NC 27713
Charlotte ■ 11301 Carmel Commons Blvd ■ Suite 111 ■ Charlotte, NC 28226
McAdamsCo,com
Designing Tomorrow's Infrastructure & Communities
HOLLY SPRINGS TOWNE CENTER -
PHASE 2
HOLLY SPRINGS, NORTH CAROLINA
AMENDMENT TO PREVIOUSLY APPROVED
STORMWATER IMPACT ANALYSIS
PROJECT NUMBER:
DESIGNED BY:
DATE:
iJ
KRG -11010
JOSH ALLEN, PE, CFM
NICOLE MATHIS, EI
JUNE 2015
MCADAMS
2905 MERIDIAN PARKWAY
DURHAM, NORTH CAROLINA 27713
NC Lic. # C -0293
\0%jji(1 / /j /�
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;a SEAL
40761
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HOLLY SPRINGS TOWNE CENTER- PHASE 2
Amendment to Previously Approved Stormwater Impact Analysis
Project Description
Located adjacent to NC Highway 55, at its northwest intersection with New Hill Road
(S.R. 1152) in Holly Springs, North Carolina, is the proposed commercial development
currently known as Holly Springs Towne Center. Proposed development on this
approximately 168 -acre site will ultimately consist of the construction of
commercial /retail buildings and outparcels, parking, sidewalks, and streets, along with
the associated infrastructure, utility, and stormwater management improvements.
Proposed for construction at this time is Phase 2 of the project along with the stormwater
management facilities associated with this area. The stormwater management facilities
designed for this submittal (SWMF #5 and #6) are designed for the ultimate build out of
the thoroughfare and the future phase of Holly Springs Towne Center. The final design
calculations for SWMF #1, #2, #3, #4, and #8 were previously submitted to and approved
by the Town under separate cover as part of Phase 1.
Holly Springs Towne Center is located within the Cape Fear River basin and will be
subject to the stormwater management requirements set forth in Section 8, Article 5 of
the Town of Holly Springs Code of Ordinances NPDES Phase II Post - Construction
Stormwater Regulations (Adopted November 6, 2007). This ordinance requires that
development properly manage stormwater runoff rate, volume, and pollutants as
necessary to protect the environment, property, health, safety, and welfare of the Town's
citizens.
Summary of the Revisions to Phase 2
This report summarizes the revisions that were made to the Phase 2 layout. Reference is
made to the previously approved Stormwater Impact Analysis (SIA), which was sealed
by Josh Allen on February 3, 2015. This report is, essentially, an amendment to said
SIA. The design imperviousness for the drainage area to SWMF #5 (49.4 %) is less than
that originally approved (49.5 %). The design imperviousness for the drainage area to
SWMF #6 (57.6 %) is less than that originally approved (57.8 %). Given this, no
adjustments to the SWMF design (detention and water quality treatment) on this project
is required as the originally planned (and approved) imperviousness represents the "worst
case" scenario for the development of the entire Parkside Town Commons tract. Please
see the appropriate sections in this report for details.
TN export calculations were also revised based on new imperviousness to each SWMF.
Please see the appropriate sections in this report for details.
Conclusion
If the development on this tract is built as proposed within this report, then the
requirements set forth in the applicable Town of Holly Springs regulations will be met
with the proposed stormwater management facilities. However, modifications to the
proposed development may require that this analysis be revised. Some modifications that
would require this analysis to be revised include:
1. The proposed site impervious surface exceeds the amount accounted for in this
report.
2. The post - development watershed breaks change significantly from those used to
prepare this report.
The above modifications may result in the assumptions within this report becoming
invalid. The computations within this report will need to be revisited if any of the above
conditions become apparent as development of the proposed site moves forward.
POST - DEVELOPMENT HYDROLOGIC
CALCULATIONS
HOLLY SPRINGS TC
KRG -11010
HOLLY gnRJNGS TOWNE CENTER POST- DEVELOPM' -T INPUT SUMMARY P `ATHIS, EI
KRG -1 SummL ,'Results 5 /24/2015
Sub -basin ID
1, A .-
1B
1C
1D
lE
_ 1F -To SWMF 2
1 F- Bypass
1G -To SWMF 8
11G-Bypass
1H -To SWMF 1
-1 H- Bypass
lI
2B
2C -To SWMF 3
2C -To SWMF 4
2C- Bypass- Offsite
3A
3B
3C -To SWMF 5
3C- Bypass
3D -To SWMF 6
3D-Bypass
5- Onsite
5- Offsite
lyzed Site Area
Tr tat. =
On -site Area [acres) Off -site Area [acres)
T t I
Open I
Wooded
750 �
0.22
0.17
6.97
2.73
0.47
' 710
0.24
0.26
7.54
8.57
0.00
0.29
0.93
1.92
1.02
3.67
0.34
1.85
1.09
0.00
5.84
1.41
2.14
0.12
1.98
0.51
3.54
3.29
0.00
3.02
0.19
1.17
2.16
0.00
0.00
0_82
0.53
0.05_
3.64
0.66
0.69
0.56
5.31
0.92
5.08
0.76
1.41
0.00
0.81
0.00
1.53
0.39
0.00
0.71
0.00
6.57
43.39
1 51.43
Im 1/4 Ac o a re",
Impervious vious Pond l Total Open l Wooded perviousResid Lots pond - Total (acres)
0.72 ( 0.00 f 8.19 0.00 0.00 I 0.00 ( 0.00 0.00 0.00 8.19
0.00 1 0.00 2.95 0.00 ( 0.00 0.00 0.00 0.00 0.00 2.95
_0.00 0.00 �_ 0.64 0.00 M 0.00 ( 0.00 0.00 0.00 0.00 N 0.64
0.00 0.00 0.34_j 0.00 �_ 0.00 0.00 0.00 0.00 0.00 0.34
0.12 0.00 7.92 0.00 0.00 0.00 0.00 0.00 0.00 7.92
22.58 1.89 33.04 0.15 0.00 0.13 0.00 0.00 ( 0.28 33.32
_0.01 0.00 1.23 0.00 0.00 0.00 0.00 0.00 0.00 1.23
3.03 0.28 8.90 0.02 0.00 1.07 0.00 0.00 1.09 9.99
0.00 0.00 1.36 0.00 0.00 0.00 0.00 0.00 0.00 1.36
6.04 0.40 8.29 0.31 0.00 1.45 0.00 1 0.00 1.76 10.05
0.01 0.00 6.94- 0.00 0.00 0.00 0.00 0.00 0.00 6.94
0.00 0.00 3.55 0.00 0.00 0.00 0.00 0.00 0.00 3.55
0.00 0.00 2.10 0.00 0.00 0.00 0.00 0.00 0.00 2.10
0.00 0.00 4.05 0.00 0.00 0.00 0.00 0.00 0.00 4.05
13.21 0.77 17.27 1.51 0.03 1.46 0.20 0.00 3.20 20.47
4.60 0.47 8.28 0.00 0.00 0.00 1 0.00 0.00 0.00 F 828
0.09 0.00 3.42 0.00 0.00 0.00 _ 0.00 0.00 0.00 3.42
0.00 0.00 0.00 2.23 0.31 1.38 0.58 0.00 4.50 4.50
0.00 0.00 1.35 0.00 0.00 0.00 0.00 j 0.00 , -� 0.00 0.18
0.00 0.00 ) 0.18 0.00 0.00 ( 0.00 0.00 0.00
9.24 0.52 18.71 0.00 0.00 0.00 2.28 N 0.00 2.28 20.99
_000 - 1.58 0.00 ( 0.00 0.00 0.00 0.00 0.00 1.58
8.64 0.60 15.01 1.11 0.00 1.53 0.00 ( 0.00 2.64 17.65
0.00 0.00 1.32 0.00 0.00 0.00 j 0.00 0.00 ( 0.00 1.32
0.00 0.00 2.22 0.00 0.00 1 0.00 0.00 0.00 0.00 N 2.22
_0.00 0.00 0.00 3.84 1.07 1.38 2.78 0.00 9.07 1 9.07 L 0.00 0.00 1.92 0.00 0.00 0.00 0.00 0.00 0.00 1.92
0.00 0.00 0.00 3.79 1.25 1.65 M 3.57 0.00 10.26 10.26 M
0.48 0.00 7.76 M 0.00 0.00 j__.., 0.00 - 0.00 0.0 0.00 7.76
0 LL
68.77 4.93 168.52 12.96 2.66 ( 10.05 ( 9.41 ( 0.00 35.08 203.60
Curve Time of
Cone.
Number [ , .
61
64
64
72
58
88
70
77
57
90
59
60
55
61
89
58
74
59
79
58
58
59
70
60
71
10.77
5.00
5.00
16.00
5.00
5.00
5.00
5.00
5.00
14.54
9.91
16.33
5.00
5.00
10.04
15.28 -
5.00
5.00
5.00 _
j 5.00
5.00
5.00
5.00
17.69
5.00
10.62
HOLLY SPRINGS TOWNE CENTER POST - DEVELOPMENT INPUT SUMMARY N. MATHIS, EI
KRG -11010
Subbasin 3C -To SWMF 5
6/24/2015
I. SCS CURVE NUMBERS
SCS CN
Area [acres]
HSG
Impervious Open Wooded
1/4 Ac. Resid Lots
A -
- 98 _ 39 30. ....
. _ ..._- 61
B
98 61 55
75
C
98 74 70
83
D
98 80 77
87
Assume: HSG'A'=
0.0%
Offsite impervious
HSG'B' =
100.0%
-
HSG'C' =
0.0%
0.00
HSG'D'=
0.0%
55
Cover Condition
SCS CN Comments
_
Offsite 1/4 Ac Resid. Lots
Impervious
98
Assume 38% hnpervious
Open
61 Assume good condition
_
Wooded
55 Assume good condition
20.99
1/4 Ac. Resid. Lots
_
75 Assume 38% Impervious
_
II. POST - DEVELOPMENT
A. Watershed Breakdown
Contributing Area
SCS CN
Area [acres]
Comments
Onsite impervious
98
9.24
-
_ Onsite open
_
61
5.31
Assume good condition _
Onsite wooded
55
3.64
Assume good condition
Onsite pond
100
0.52
Offsite impervious
98
0.00
-
_
Offsite open
61
0.00
Assume good condition
Offsite wooded
55
0.00
Assume good condition
_
Offsite 1/4 Ac Resid. Lots
75
2.28
Assume 38% hnpervious
_
Offsite pond
_
100
_
0.00
-
Total area =
20.99
acres
0.0328
sq.mi.
Composite SCS CN =
79
% Impervious = 48.1%
B. Time of Concentration Information
Time of concentration was conservatively assumed to be 5 minutes.
Time of Concentration = 5.00 minutes
SCS Lag Time = 3.00 minutes (SCS Lag = 0.6* Tc)
0.0500 hours
Time Increment = 0.87 minutes (= 0.29 *SCS Lag)
HOLLY SPRINGS TOWNE CENTER POST- DEVELOPMENT INPUT SUMMARY N. MATHIS, EI
KRG -11010 Subbasin 3D -To SWMF 6 6/24/2015
I. SCS CURVE NUMBERS
HSG
61
Impervious
Open
Wooded
A _
Onsite pond
_ .....
98
--
- 39
30
B
1.53
98
61
55
C
98
74
70
D
98
80
77
Assume.
HSG'A'=
0.0%
HSG'B'=
100.0%
HSG'C'=
0.0%
HSG'D'=
0.0%
Cover Condition SCS CN Comments
Impervious 98 -
Open 61 Assume good condition
Wooded 55 Assume good condition
II. POST - DEVELOPMENT ,
A. Watershed Breakdown
Contributing Area SCS CN Area [acres] Comments
Onsite impervious 98 8.64
Onsite open
61
5.08
Onsite wooded
55
0.69
Onsite pond
100
0.60
Offsite impervious
98
1.53
Offsite pen
Offsite wooded
61
55
1.11
0.00
Total area =
Composite SCS CN =
% Impervious =
17.65 acres
0.0276 sq.mi.
83
57.6%
B. Time of Concentration Information
Time of concentration was conservatively assumed to be 5 minutes.
Assume good condition
Assume good condition
Assume good condition
Assume good condition
minutes
minutes (SCS Lag = 0.6* Tc)
hours
minutes (= 0.29 *SCS Lag)
Time of Concentration = 5.00
SCS Lag Time = 3.00
= 0.0500
Time Increment = 0.87
Assume good condition
Assume good condition
Assume good condition
Assume good condition
minutes
minutes (SCS Lag = 0.6* Tc)
hours
minutes (= 0.29 *SCS Lag)
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NUTRIENT L OADING CAL CULA TIONS
HOLLY SPRINGS TC
KRG -11010
HOLLY SPRINGS TC PHASE 2 POST- DEVELOPMENT NITROGEN EXPORT CALCULATIONS
N. MATHIS, El
KRG -11010
Summary of Results
6/24/2015
TN- Loading Input Data
Phase 1 and 2 Area [acres]
Sub -basin ID
Open
Wooded
Impervious
Pond
Total
To SWMF #1 2.16
0.00
7.49
0.40
10.05 -
ToSWMF #2 8.58
0.00
22.71
1.89
33.18
To SWMF #3 1.74
0.00
9.45
0.00
11.19
To SWMF #4 3.08
0.19
4.60
0.47
8.34
To SWMF #5 4.68
1.01
9.13
0.52
15.34
To SWMF #6 5.80
0.00
10.09
1.42
17.31
Bypass Area 10.09
5.73
1.02
0.00
16.84 �i
Totals = 36.13
6.93
_
64.49
4.70
112.25
_> TN- Loading Output Data
Sub -basin ID Phase 1 and 2 Area [acres]
TN -Load Before
% Removal
TN -Load After Treatment
BMP Type
Treatment Ibs/ r ]
[lbs/ r
To SWMF #1 10.05
161.86
25%
121.40
Wet Pond
To SWMF #2 33.18
494.02
40%
296.41
SW Wetland
To SWMF #3 11.19
202.51
25%
151.88
Wet Pond
To SWMF #4 8.34
101.87
40%
61.12
1 SW Wetland
To SWMF #5 15.34
200,40
25%
150.30
Wet Pond
To SWMF #6�
17.31
0.00
25%
0.00
Wet Pond
- - --
Bypass Area 16.84
37.17
0%
37.17
-
_
Totals = 112.25
1,197.83
818.28
TN -Load Before Treatment =
1,197.83
lbs /yr
=
10.67
Ibs /ac /yr
Compute Max. Allowable TN -Export with an Offset
Payment
Max Allowable TN- Export =
10.00
lbs/yr
=
1,122.51
lbs/ac/yr
Compute Estimated Offset Payment
Phase 1 and 2 Area =
112.25
acres
Max. TN -Export w/o Offset Payment =
404.10
lbs /yr
3.60
lbs /ac /yr
Computed TN -Export After Treatment =
818.28
lbs /yr
7.29
lbs/ac /yr
Phase I and 2 TN -Export to be Offset =
3.69
lbs /ac /yr
=
12,425.39
lbs
Phase 1 TN -Export (Previously Offset) =
5.45
lbs /ac /yr
=
12,615.66
lbs
Remaining Phase 2 Nitrogen Loading Credit =
190.27
lbs
� CALC�Av�pr16
1`ZYTR�G�N �XppR
ST p�V 'L' 'V T SWMF #5
pgASE 2 Y� WHEW Footprints of all
5p�1N�S �C m}nerciat �evetopments
t � Industrial � Co
"I
K r in C Calum � enter in Co mn (�)'
rt esident�a olumn (2)' n (�)' lu
N1V,TRpD gTN F,xPo are shown• land use and er at the bOtto . Column (�) Lynn (4). at e bottom of
Quantify s Surfaces each tYPe of e and' ente efflCLents attom of Col uses th
flop r`'iou e the area for ch type of land e TN e)po enter at the al TN "Port from
p 1: Deterrni e area for ea Cotum,, (2) boo land site by
�,se art ividing the to
�� p 2 Total t t the areas m for eaccien� f° f the om o f Column (2)' �4� �s�
5T p 3' the TN exPorort cpefi t the bott °rt irom
S TE p 5. Determ(4) by eXP e total a� Ea a (x� N export cOeff. tN ex (�b$lyri
gTE Column Axes (1b5�aclyC7 0.61
cover
`Type `Type of Lana C turbed
rotected art meadow)
Van v p anentty t unmanaged
EyYi1 a ores ,
open sPac tty Protected scapit' etc-)
PrE ma" a rass, land ds, Parking
open spaces( urfaceS (r°a ed storage
bnPQ1V io eways roofs, P
lots, dr ) A
*TC
p.6
12
5 20
212
9,13
ayeas, etc. .Tp T A _
TN BXl'oTt
Total ions
1OVCTV
15:x4
1bslaclyT
13.1
59.5%
624
193.56
,_�
N. MATHIS, EI
HOLLY SPRINGS TC PHASE 2 POST - DEVELOPMENT NITROGEN EXPORT CALCULATIONS 6/24/2015
KRG -11010 To SWMF #6
METHOD 2:
Quantifying TN Export from Residential /Industrial / Commercial Developments when Footprints of all
Impervious Surfaces are shown.
STEP 1: Determine the area for each type of land use and enter in Column (2).
STEP 2: Total the areas for each type of land use and enter at the bottom of Column (2).
STEP 3: Multiply the areas in Column (2) by the TN export coefficients in Column (3) and enter in Column (4).
STEP 4: Total the TN exports for each type of land use and enter at the bottom of Column (4).
STEP 5: Determine the export coefficient for the site by dividing the total TN export from uses at the bottom of
Column (4) by the total area at the bottom of Column (2).
(1)
(2)
;. (3) ,
(4)
Type of Land Cover
Area
TN export coeff.
TN export from use
[acres]
(lbs /ac /yr) f
(lbs /yr)
Permanently protected undisturbed i
0.00
0.6 I
0.00
open space (forest, unmown meadow)
f
Permanently protected managed
7.22
1.2 I
8.66
open space (grass, landscaping, etc)
i
Impervious surfaces (roads, parking
lots, driveways, roofs, paved storage
10.09
21.2
213.91
areas, etc.)
TOTAL
17.31
- --
222.57-1—
Total TN Export =
12.9
lbs /ac /yr
% impervious =
58.3%
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LEGEND
TOTAL PROJECT NITROGEN ANALYSIS A
PHASE 1 NITROGEN ANALYSIS AREA
PHASE 2 NITROGEN ANALYSIS AREA
MEASURED PHASE 1 IMPERVIOUS AREA
MEASURED PHASE 2 IMPERVIOUS AREA
MEASURED WOODED AREA
AREAS EXCLUDED FROM NITROGEN CAL
BYPASS /UNTREATED IMPERVIOUS AREAS
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TOTAL
NITROGEN
ANALYSIS
AREA =
177.13
acres
PROJECT NO. KRG -11010
TOTAL
PHASE 1
NITROGEN
ANALYSIS
AREA
= 76.87 acres
FILENAME:KRG1 101 0—TNCALCS
TOTAL
PHASE 2
NITROGEN
ANALYSIS
AREA
—
— 35.38 acres
DESIGNED BY: JCA
DRAWN BY: NAM
SCALE: 1"=200'
DATE: 06 -24 -15
SHEET NO. TN
" MCADAMs
FINAL DRAWING - NOT RELEASED FOR CONSTRUCTION