SW3170101_Stormwater Report_20230503

St. Philips the Apostle: Education Center
City of Statesville I Iredell County I North Carolina
CALCULATIONS FOR:
Built Upon Area
PREPARED FOR:
NCDEMLR Stormwater Program
1612 Mail Service Center
Raleigh, North Carolina 27699-1612
Submitted:
Little Project Number
March 23, 2023
112.5254.02
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PREPARED BY:
Little Diversified Architectural Consulting
615 South College Street, Suite 1600
Charlotte, North Carolina 28202
615 South College Street, Suite 1600, Charlotte, INC 28202 t 704.525.6350 w littleonline.com

St. Philips the Apostle: Education Center
Little Project Number 112.5254.02
TABLE OF CONTENTS
Project Narrative & NCDEQ EZ Forms............................................................3
USGSTopo Map..................................................................................8
BuiltUpon Area Maps...........................................................................10
Current State Stormwater Permit SW3170101.................................................13
NOTE" The most recent version of these calculations shall supersede all others.
615 South College Street, Suite 1600, Charlotte, NC 28202 t 704.525.6350 w littleonline.com

St. Philips the Apostle: Education Center
Little Project Number 112.5254.02
PROJECT NARRATIVE
PROJECT DESCRIPTION & I OCA TION MAP
The proposed St. Philips the Apostle Education Center is located at 525 Harmony Drive in
Statesville, North Carolina. The site consists of one parcel identified as Iredell County Property
Identification Number 4744750333.000 totaling 4.991 acres. The project proposes the
demolition and replacement of a portion of the existing church facility. The owner of the
property is Catholic Diocese of Charlotte.
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615 South College Street, Suite 1600, Charlotte, INC 28202 t 704.525.6350 w littleonline.com
3

St. Philips the Apostle: Education Center
Little Project Number 112.5254.02
EXISTING CONDITIONS
The existing site contains a church & classroom building, a Parish Hall, and associated
parking. The site has been developed since the late-1970's. The site is bounded by Interstate
77 to the east, Harmony Drive to the south, vacant residential property to the west, and
residential properties to the north.
Existing site grades generally range from an approximate elevation of 865 feet along the ridge
line where the existing buildings are located, then down a steep wooded slope to the north
and parking lot to the southwest. The parking lot discharges to a draw that runs south to north
along the western property line.
The property is in Flood Zone X. Please refer to FEMA Map Number 3710474400J.
SU/L T-UPONAREA
The existing church facility was issued a State Stormwater Permit in January 2017, prior to
the construction of a parking lot on the parcel south of the proposed Education Center parcel.
State and local jurisdictions were unable to provide the plans and calculations for this permit,
however, the permit itself was provided and is included in this report.
Per the approved permit, the site is low density. By maintaining the impervious area approved
during development of the parking lot, the site will remain low density. The Existing BUA Map
included with this report shows the existing conditions as what was approved under State
Stormwater Permit SW3170101 (BUAEX = 99,606 sf). The Proposed BUA Map shows site
improvements since that permit was issued (BUAPR = 97,448 sf). The overall BUA decreases
in the proposed condition, however, future BUA is noted (BUAFUT = 2,158 sf) such that the
Diocese has flexibility to install additional BUA up to the amount noted in the existing
conditions map (99,606 sf).
615 South College Street, Suite 1600, Charlotte, INC 28202 t 704.525.6350 w littleonline.com
4

SUPPLEMENT-EZ COVER PAGE
FORMS LOADED
PROJECT INFORMATION
1 Project Name
2 Proiect Area (ac)
4 ISurface Water Area
Does this Proiect use an off -site SCM?
St. Philips the Apostle Education Center
4.991
N/A
N/A
Low
No
COMPLIANCE WITH 02H .1003(4)
7
Width of vegetated setbacks provided feet
N/A
8
Will the ve etated setback remain vegetated?
N/A
9
If BUA is proposed in the setback, does it meet NCAC 02H.1003 4 c-d ?
N/A
10
Is streambank stabilization proposed on this project?
No
NUMBER AND TYPE OF SCMs:
11
Infiltration S stem
12
Bioretention Cell
13
Wet Pond
14
Stormwater Wetland
15
Permeable Pavement
16
Sand Filter
17
Rainwater Harvesting RWH
18
Green Roof
19
Level Spreader -Filter Strip LS-FS
20
Disconnected Impervious Surface DIS
21
Treatment Swale
22
1 Dry Pond
23
StormFilter
24
Silva Cell
25
Bayfilter
26
Filterra
FORMS LOADED
DESIGNER CERTIFICATION
27
Name and Title:
Frank G. Miller, PE
28
Organization:
Little Diversified Architectural Consulting
29
Street address:
615 South College Street, Suite 1600
30
City, State, Zip:
Charlotte, NC 28202
31
Phone numbers :
704-561-8752
32
Email:
[e-mail]
Certification Statement:
I certify, under penalty of law that this Supplement-EZ form and all supporting information were prepared under my direction or supervision; that
the information provided in the form is, to the best of my knowledge and belief, true, accurate, and complete; and that the engineering plans,
specifications, operation and maintenance agreements and other supporting information are consistent with the information provided here.
Designer
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Signature of Designer
03/23/2023
Date

DRAINAGE AREAS
1
Is this a hi h density project?
No
2
If so, number of drainage areas/SCMs
0
3
Does this project have low density areas?
Yes
4
If so, number of low density drainage areas
1
5
Is all/part of this project subject to previous rule
versions?
No
FORMS LOADED
DRAINAGE AREA INFORMATION
Entire Site
LID 1
4
Type of SCM
n/a
5
Total drainage area (sq ft
217408
6
Onsite drainage area (sq ft
217408
7
Offsite drainage area (sq ft
0
8
Total BUA in project (sq ft
-2158 sf
9
New BUA on subdivided lots (subject to
ermitting) (sq ft
n/a
10
New BUA not on subdivided lots (subject to
ermittin sf
n/a
11
Offsite BUA (sq ft
sf
12
Breakdown of new BUA not on subdivided lots:
Parking (sq ft
Sidewalk (sq ft
Roof (sq ft
-2158 sf
Roadway s ft
- Future sq ft
2158 sf
- Other, please specify in the comment box
below (sq ft
13
New infiltrating permeable pavement on
subdivided lots (sq ft
sf
14
New infiltrating permeable pavement not on
isubdivided lots (sq ft
sf
15permitting)
Existing BUA that will remain (not subject to
s ft
97448 sf
16
Existing BUA that is already permitted (sq ft
99606 sf
17
Existing BUA that will be removed (sq ft
sf
18
Percent BUA
0%
19
Design storm inches
20
Design volume of SCM cu ft
21
Calculation method for design volume
ADDITIONAL INFORMATION
Please use this space to provide any additional information about the
22 drainage area(s):
Existing BUA permitted as part of SW3170101. No increase in BUA
proposed as part of this project. Future BUA noted so that total allowable
BUA matches what was approved as part of SW3170101.

LOW DENSITY
DESIGN REQUIREMENTS FOR LOW DENSITY PROJECTS FROM 02H .1003
1 Is project below density thresholds set forth in the applicable stormwater rule? Yes
2
Does project maximize dispersed flow and minimize channelization of flow?
Yes
3
Has the use of piping been minimized per .1003(2)(c)?
Yes
4
Side slopes of the vegetated conveyances (H:V)
5
Maximum velocity in the vegetated conveyances during the 10-year storm?
6
Are curb outlet swales proposed?
No
7
1 Maximum longitudinal slope of curb outlet swale(s) (%)
8
Bottom width of curb outlet swale(s) (feet)
9
Maximum side slope of curb outlet swale(s) (H:V)
10
Minimum length of curb outlet swale(s) (feet)
11
Are treatment swales used instead of curb outlet swales?
12
Is stormwater released at the edge of the setback as dispersed flow?
N/A
13
1 Have stormwater outlets been designed to prevent downslope erosion?
Yes
14
JAre variations to rule .1003 proposed?
Yes
ADDITIONAL
INFORMATION
15
1 Please use this space to provide any additional information about this low density project:
This project reduces the built -upon area from what was approved under SW3170101. While there are inlets and piping proposed
in the courtyard, the outlet of that pipe system discharges into an existing parking lot where stormwater is captured in an existing
curb inlet. This is the same as the existing conditions. Even with the proposed pipes, stormwater still exits the site via the existing
piping from the parking lot curb inlet, thus meeting 15A NCAC 02H .1003(6)(a) for ".....equal or better stormwater control..." Roof
leaders for the propsed building have been designed to match the existing roof leader drainage areas and outlet point, thus
meeting 15A NCAC 02H .1003(6)(a) for ".....equal or better stormwater control..."

St. Philips the Apostle: Education Center
Little Project Number 112.5254.02
USGS TOPOGRAPHIC MAP
615 South College Street, Suite 1600, Charlotte, INC 28202 t 704.525.6350 w littleonline.com

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9 ADJOINING QUADRANGLES

St. Philips the Apostle: Education Center
Little Project Number 112.5254.02
BUILT -UPON AREA MAPS
615 South College Street, Suite 1600, Charlotte, INC 28202 t 704.525.6350 w littleonline.com
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PROJECT
TEAM
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David Powlen, PLA
PROJECT MANAGER
Casey Cline, PLA
DESIGN TEAM
PROJECT
St. Philip the Apostle
Education Center
PROJECT
112.5254.02
SHEET TITLE
Drainage Area Map:
Existing Conditions
SHEET NUMBER
C402

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BUILT-UPON AREA RE -CALCULATED FOR PARCEL ID
#4744750333.000 ONLY. NO IMPROVEMENTS PROPOSED ON
PARCEL ID #4744740895.000, THEREFORE THAT PARCEL IS STILL
IN COMPLIANCE WITH STATE STORMWATER PERMIT SW3170101.
GRAPHIC SCALE
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615 South College Street, Suite .00
Charlotte, INC 28202
-
www.littleonline.com
This drawing and the design shown are the property
of Little Diversified Architectural Consulting. The
reproduction, copying or other use of this drawing
without their written consent is prohibited and any
infringement will be subject to legal action.
© Little 2023
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Construction
Documents
13/23
0.R
DATE
PROJECT
TEAM
PRINCIPAL IN CHARGE
David Powlen, PLA
PROJECT MANAGER
Casey Cline, PLA
DESIGN TEAM
PROJECT
St. Philip the Apostle
Education Center
PROJECT
112.5254.02
SHEET TITLE
Drainage Area Map:
Proposed Conditions
SHEET NUMBER
C403

St. Philips the Apostle: Education Center
Little Project Number 112.5254.02
CURRENT STATE STORMWATER PERMIT
615 South College Street, Suite 1600, Charlotte, NC 28202 t 704.525.6350 w littleonline.com
13

State Stormwater Permit
Permit No.SW3170101
STATE OF NORTH CAROLINA
DEPARTMENT OF ENVIRONMENT QUALITY
STATE STORMWATER MANAGEMENT PERMIT
In accordance with the provisions of Article 21 of Chapter 143, General Statutes of
North Carolina as amended, and other applicable Laws, Rules and Regulations
PERMISSION IS HEREBY GRANTED TO
St. Phillip Catholic Church, Statesville, NC, Iredell County
FOR THE
construction, operation and maintenance of a low density development, in compliance
with the provisions of 15A NCAC 2H .1017 (hereafter referred to as the "stormwater
rules') and the approved stormwater management plans and specifications, and other
supporting data as attached and on file with and approved by the State and considered
a part of this permit.
The Permit shall be effective from the date of issuance until rescinded and shall be
subject to the following specific conditions and limitations:
I. DESIGN STANDARDS
1. The overall tract built -upon area percentage for the project must be maintained
below 24%, as required by 15A NCAC 2H .1017 of the stormwater rules.
3. Approved plans and specifications for projects covered by this permit are
incorporated by reference and are enforceable parts of the permit.
4. The only runoff conveyance systems allowed will be vegetated conveyances such
as swales with minimum side slopes of 3:1 (H:V) as defined in the stormwater
rules and approved by the Division.
5. No piping is allowed except that minimum amount necessary to direct runoff
beneath an impervious surface such as a road or to provide access.
6. All roof drains must terminate at least 30 foot from the mean high water mark.
7. The built -upon areas associated with this project shall be located at least 30 feet
landward of all perennial and intermittent streams.
8. All swales that discharge into a wetland shall do so at a non -erosive velocity for
the 10 year storm.
9. Curb cuts must be provided where ribbon curbs and/or curb and gutter is
provided.
II. SCHEDULE OF COMPLIANCE
1. The permittee is responsible for verifying that the proposed built -upon area does
not exceed the allowable built -upon area.
14
Page 1 of 4

State Stormwater Permit
Permit No.SW3170101
2. The Director may notify the permittee when the permitted site does not meet one
or more of the minimum requirements of the permit. Within the time frame
specified in the notice, the permittee shall submit a written time schedule to the
Director for modifying the site to meet minimum requirements. The permittee shall
provide copies of revised plans and certification in writing to the Director that the
changes have been made.
3. This project may not be sold or subdivided in whole or in part without first
receiving a permit modification.
4. The following deed restrictions must be recorded with the Office of the Register of Deeds:
a. The following covenants are intended to ensure ongoing compliance with
State Stormwater Management Permit Number SW3170101.
b. The State of North Carolina is made a beneficiary of these covenants to
the extent necessary to maintain compliance with the Stormwater
Management Permit.
C. These covenants are to run with the land and be binding on all persons
and parties claiming under them.
d. The covenants pertaining to stormwater may not be altered or rescinded
without the express written consent of the State.
e. Alteration of the drainage as shown on the approved plans may not take
place without the concurrence of the State.
f. This project may not be sold or subdivided, in whole or in part, without first
receiving a permit modification from the Division.
h. Construction of additional impervious areas such that low -density
requirements are no longer met will require a permit modification prior to
construction. An engineered system will be required to collect and treat the
runoff from all built -upon area associated with the project, including that
area permitted under the low density option.
i. Filling in or piping of any vegetative conveyances (ditches, swales, etc.)
associated with this development, except for average driveway crossings,
is strictly prohibited by any persons.
j. The built -upon areas shall be located a minimum of 30 feet landward of all
perennial and intermittent surface waters.
5. A copy of the recorded restrictions must be received in this Office within 30 days
of the date of sale.
6. Filling in or piping of any vegetative conveyances (ditches, swales, etc.)
associated with the permitted development, except for average driveway
crossings, is strictly prohibited by any persons.
7. The permittee shall submit to the Director and shall have received approval for
revised plans, specifications, and calculations prior to construction, for any
modification to the approved plans, including, but not limited to, those listed
below:
a. Any revision to the approved plans, regardless of size.
b. Project name change.
C. Transfer of ownership.
d. Redesign or addition to the approved amount of built -upon area.
e. Further subdivision, acquisition, or sale of the project area in whole or in
part. The project area is defined as all property owned by the permittee, for
which Sedimentation and Erosion Control Plan approval was sought.
f. Filling in, altering or piping any vegetative conveyance shown on the
approved plan.
15
Page 2 of 4

State Stormwater Permit
Permit No.SW3170101
8. During construction, erosion shall be kept to a minimum and any eroded areas of
the swales or other vegetated conveyances will be repaired immediately.
9. The permittee shall at all times provide the operation and maintenance necessary
to operate the permitted stormwater management systems at optimum efficiency
to include:
a. Inspections
b. Sediment removal.
c. Mowing, and re -vegetating of the side slopes.
d. Immediate repair of eroded areas.
e. Maintenance of side slopes in accordance with approved plans and
specifications.
10. Within 30 days of completion of the project, the permittee shall certify in writing
that the project has been constructed in accordance with the approved plans.
11. The permittee shall submit all information requested by the Director or his
representative within the time frame specified in the written information request.
III. GENERAL CONDITIONS
This permit is not transferable to any person or entity except after notice to and
approval by the Director. The Director may require modification or revocation and
re -issuance of the permit to change the name and incorporate such other
requirements as may be necessary. In the event of a name or ownership change,
a completed Name/Ownership Change form, signed by both parties, must be
submitted to the State accompanied by the supporting documentation as listed on
page 2 of the form. The approval of this request will be considered on its merits,
and may or may not be approved.
2. The permittee is responsible for compliance with all permit conditions until the
Director approves a transfer of ownership. Neither the sale of the project nor the
transfer of common areas to a third party, such as a homeowner's association,
constitutes an approved transfer of the stormwater permit.
3. Failure to abide by the conditions and limitations contained in this permit may
subject the Permittee to an enforcement action in accordance with North Carolina
General Statutes 143-215.6A to 143-215.6C.
4. The issuance of this permit does not prohibit the Director from reopening and
modifying the permit, revoking and reissuing the permit, or terminating the permit
as allowed by the laws, rules, and regulations contained in Session Law 2006-
246, Title 15A of the North Carolina Administrative Code, Subchapter 21-1.1000;
and North Carolina General Statute 143-215.1 et. al.
5. In the event that the facilities fail to perform satisfactorily, including the creation of
nuisance conditions, the Permittee shall take immediate corrective action,
including those as may be required by the State, such as the construction of
additional or replacement stormwater management systems.
6. The permittee grants permission to DEQ Staff to enter the property during normal
business hours, for the purpose of inspecting all components of the stormwater
management facility.
16
Page 3 of 4

State Stormwater Permit
Permit No.SW3170101
7. The permit issued shall continue in force and effect until revoked or terminated.
The permit may be modified, revoked and reissued or terminated for cause. The
filing of a request for a permit modification, revocation and re -issuance, or
termination does not stay any permit condition.
8. Unless specified elsewhere, permanent seeding requirements for the swales
must follow the guidelines established in the North Carolina Erosion and
Sediment Control Planning and Design Manual.
9. Approved plans and specifications for this project are incorporated by reference
and are enforceable parts of the permit.
10. The issuance of this permit does not preclude the Permittee from complying with
any and all statutes, rules, regulations, or ordinances, which may be imposed by
other government agencies (local, state and federal), which have jurisdiction.
11. The permittee shall notify the Division in writing of any name, ownership or
mailing address changes at least 30 days prior to making such changes.
Permit issued this the 171h day of January 2017.
0-01W Sued Y lfflclxal f leaadaff
for Tracy E. Davis, P.E., CPM
Director Division of Energy, Mineral, and Land Resources
17
Page 4 of 4