SW5220601_Stormwater Report_20220712

Stormwater Management
Report
Community Baptist Church
Of
Siler City
SEA Job # 5437
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Summey Engineering
Associates, PLLC
PO Box 968
Asheboro, NC 27204
Phone: [phone]
Fax: [phone]
Email: [e-mail]

Community Baptist Church
SEA,PLLC
Proiect Overview:
Community Baptist Church of Siler City is a religious worship facility with associated
driveways, parking areas and utilities. The site is located at Hamp Stone Rd, 2575 Hamp Stone
Rd, Siler City, NC. The project parcel is approximately 29.66 acres and is a mixture of open
spaces, wooded areas, and an existing religious worship facility with associated parking and
drive areas.
The majority of soils on site are Herndon silt loam (HrB), Hydrologic Soil Group(HSG) B, with
a smaller portion consisting of Cid-Lignum Complex (CmB) HSG D. There are no floodplains
on site per NC FIRM Panel 3710874200J. Per USGS topographic maps there are no
jurisdictional features located on the project site. The entire site drains to Blood Run Creek, a
part of the Cape Fear River Basin.
Stormwater Management:
The project is located inside the Town of Siler City and therefore must comply with all
requirements set forth by the Town of Siler City Ordinances. The project must also comply with
all regulations set forth by NCDEQ.
The Town of Siler City's Low Density Project Limit is 7%. NCDEQ's Low Density Project
Limit is 24 % Built Upon Area.
The site area calculations have evaluated existing conditions. The Existing site has 76,708 sf of
existing impervious area. This impervious are has been subtracted from the overall project area
to generate the Net Effective Area of the project. The Effective impervious area for this site has
been calculated by diving the proposed impervious addition by the net effective site area.
The proposed site has an effective impervious area percentage of 4.63%. Therefore, the site is
considered a low density project per Town of Siler City Ordinances and NCDEQ Requirements.

Community Baptist Church
SEA,PLLC
Attachments:
- DA-1 Existing Site Area Map
- DA-2 Proposed Site Area Map
- USGS Topo Map
- NRCS Hardbound Soils Map
- Hydrologic Soils Group Map
- FIRM Panel3710874200J
- Aerial

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EXISTING
IMPERVIOUS
- AREA-_
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PROPERTY BOUNDARY
o°
DRAWING LEGEND
PROPERTY BOUNDARY
IMPERVIOUS AREA EXISTING
EXISTING SITE AREA CALCULATIONS:
GRASS: 1,215,409 SF (27.90 AC)
IMPERVIOUS 76,708 SF (1.76 AC)
TOTAL AREA: 1,292,117 SF (29.66 AC)
EXISTING IMPERVIOUS AREA: 5.94%
TOTAL AREA — EX. IMPERVIOUS =NET EFFECTIVE AREA
NET EFFECTIVE AREA: 1,215,409 SF. (27.90 AC.)
C 200' 400' 600'
DRAWING SCALE
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DRAWING LEGEND
PROPERTY BOUNDARY
IMPERVIOUS AREA EXISTING
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3RASS: 1,215,409 SF
(27.90 AC)
MPERVIOUS: 76,708 SF (1.76 AC)
TOTAL AREA: 1,292,117 SF (29.66 AC)
ISTING IMPERVIOUS AREA: 5.94%
TAL AREA — EX. IMPERVIOUS =NET EFFECTIVE AREA
JET EFFECTIVE AREA: 1,215,409 SF. (27.90 AC.)
DROPOSED SITE AREA CALCULATIONS:
3RASS: 1,159,136 SF (26.82 AC
MPERVIOUS: 132,981 SF (2.85 AC)
TOTAL AREA: 1,292,117 SF (29.66 AC
ALL IMPERVIOUS AREA: 10.3%
(132,981 SF / 1,215,409 SF) = 10.3%
ET EFFECTIVE AREA: 1,215,409 SF (27.90 AC)
MPERVIOUS ADDITION: 56,273 SF
123,981 SF — 76,708 SF = 56,273 SF
ET EFFECTIVE IMPERVIOUS AREA: 4.63%
IMPERVIOUS ADDITION / NET EFFECTIVE AREA
56.273 SF / 1.215.409 SF = 4.63%
80' 160' 240'
DRAWING SCALE
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N
636590
35o 44'43"N
35o 44' 23" N
636590 636660 636730 636800 636870
Map Scale: 1:3,060 if printed on A portrait (8.5" x 11") sheet.
Meters
N 0 45 90 180 270
Feet
0 100 200 400 600
Map projection: Web Mercator Conermordinates: WGS84 Edge tics: lfrM Zone 17N WGS84
usoA Natural Resources Web Soil Survey
Conservation Service National Cooperative Soil Survey
Hydrologic Soil Group —Chatham County, North Carolina
6366M 636730 636800 636870 636940
637010
35o 44' 43" N
35o 44' 23" N
637010
v
N
5/18/2022
Pagel of 4

Hydrologic Soil Group —Chatham County, North Carolina
MAP LEGEND
Area of Interest (AOI)
0
Area of Interest (AOI)
Soils
Soil Rating
Polygons
0
A
0
A/D
0
B
0
B/D
C
0
C/D
0
D
0
Not rated or not available
Soil Rating
Lines
r 0
A
r 0
A/D
B
B/D
N 0
C
r 0
C/D
r 0
D
r 0
Not rated or not available
Soil Rating
Points
0
A
0
A/D
0
B
0
B/D
❑ C
0 C/D
0 D
❑ Not rated or not available
Water Features
Streams and Canals
Transportation
— Rails
­0 Interstate Highways
US Routes
Major Roads
Local Roads
Background
D6 Aerial Photography
MAP INFORMATION
The soil surveys that comprise your AOI were mapped at
1:24,000.
Warning: Soil Map may not be valid at this scale.
Enlargement of maps beyond the scale of mapping can cause
misunderstanding of the detail of mapping and accuracy of soil
line placement. The maps do not show the small areas of
contrasting soils that could have been shown at a more detailed
scale.
Please rely on the bar scale on each map sheet for map
measurements.
Source of Map: Natural Resources Conservation Service
Web Soil Survey URL:
Coordinate System: Web Mercator (EPSG:3857)
Maps from the Web Soil Survey are based on the Web Mercator
projection, which preserves direction and shape but distorts
distance and area. A projection that preserves area, such as the
Albers equal-area conic projection, should be used if more
accurate calculations of distance or area are required.
This product is generated from the USDA-NRCS certified data as
of the version date(s) listed below.
Soil Survey Area: Chatham County, North Carolina
Survey Area Data: Version 25, Jan 21, 2022
Soil map units are labeled (as space allows) for map scales
1:50,000 or larger.
Date(s) aerial images were photographed: Jul 28, 2019—Jul 30,
2019
The orthophoto or other base map on which the soil lines were
compiled and digitized probably differs from the background
imagery displayed on these maps. As a result, some minor
shifting of map unit boundaries may be evident.
usoA Natural Resources Web Soil Survey 5/18/2022
Conservation Service National Cooperative Soil Survey Page 2 of 4

Hydrologic Soil Group —Chatham County, North Carolina
Hydrologic Soil Group
Map unit symbol
Map unit name
Rating
Acres in AOI
Percent of AOI
CmB
Cid-Lignum complex, 2
to 6 percent slopes
D
4.6
19.1 %
HrB
Herndon silt loam, 2 to 6
percent slopes
B
19.4
80.9%
Totals for Area of Interest
23.9
100.0%
Description
Hydrologic soil groups are based on estimates of runoff potential. Soils are
assigned to one of four groups according to the rate of water infiltration when the
soils are not protected by vegetation, are thoroughly wet, and receive
precipitation from long -duration storms.
The soils in the United States are assigned to four groups (A, B, C, and D) and
three dual classes (A/D, B/D, and C/D). The groups are defined as follows:
Group A. Soils having a high infiltration rate (low runoff potential) when
thoroughly wet. These consist mainly of deep, well drained to excessively
drained sands or gravelly sands. These soils have a high rate of water
transmission.
Group B. Soils having a moderate infiltration rate when thoroughly wet. These
consist chiefly of moderately deep or deep, moderately well drained or well
drained soils that have moderately fine texture to moderately coarse texture.
These soils have a moderate rate of water transmission.
Group C. Soils having a slow infiltration rate when thoroughly wet. These consist
chiefly of soils having a layer that impedes the downward movement of water or
soils of moderately fine texture or fine texture. These soils have a slow rate of
water transmission.
Group D. Soils having a very slow infiltration rate (high runoff potential) when
thoroughly wet. These consist chiefly of clays that have a high shrink -swell
potential, soils that have a high water table, soils that have a claypan or clay
layer at or near the surface, and soils that are shallow over nearly impervious
material. These soils have a very slow rate of water transmission.
If a soil is assigned to a dual hydrologic group (A/D, B/D, or C/D), the first letter is
for drained areas and the second is for undrained areas. Only the soils that in
their natural condition are in group D are assigned to dual classes.
Rating Options
Aggregation Method. Dominant Condition
USDA Natural Resources Web Soil Survey 5/18/2022
Conservation Service National Cooperative Soil Survey Page 3 of 4

Hydrologic Soil Group —Chatham County, North Carolina
Component Percent Cutoff.- None Specified
Tie -break Rule: Higher
USDA Natural Resources Web Soil Survey 5/18/2022
IM Conservation Service National Cooperative Soil Survey Page 4 of 4

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SEE FIS REPORT FOR ZONE DESCRIPTIONS AND INDEX MAP
THE INFORMATION DEPICTED ON THIS MAP AND SUPPORTING
DOCUMENTATION
ARE ALSO AVAILABLE IN DIGITAL FORMAT AT
HTTP:// FR IS. N C. GOV/ FRIS
Base Flood Elevation (BFE)
-Without
Zone A,V, A
With BFE or Depth Zone ,9E, AO, AH, VE, AR
SPECIAL FLOOD
® Regulatory Floodway
HAZARD AREAS
® 0.2 % Annual Chance Flood Hazard, Areas
of 1 % Annual Chance Flood with Average
Depth Less Than One Foot or With Drainage
Areas of Less Than One Square Mile Zone x
Future Conditions 1 % Annual
Chance Flood Hazard Zane x
OTHER AREAS OF
r + / Area with Reduced Flood Risk due to Levee
FLOOD HAZARDS
+
See Notes
OTHER
�+Areas Determined tobeOutside the
AREAS
0.2 % Annual Chance Floodplain zone x
-------- Channel, Culvert, or Storm Sewer
Accredited or Provisionally Accredited
GENERAL
Levee, Dike,orFloodwall
STRUCTURES
. . . . . . . . . . . . . Non -accredited Levee, Dike, or Floodwall
BM5510x North Carolina Geodetic Survey benchmark
BM55100 National Geodetic Survey bench mark
BM5510'�> Contractor Est. NCFMP Survey bench mark
o�is-z— Cross Sections with 1% Annual Chance
Water Surface Elevation (BFE)
C- - - - - - Coastal Transect
------- Coastal Transect Baseline
Profile Baseline
Hydrographic Feature
OTHER
IJ mit of Study
FEATURES
Jurisdiction Boundary
NOTES TO USERS
For informatio,,,d questionsabout[his map, available products a aced with [his FIRMcluding
historic versions of Ibis FIRM, bow to order protlu US or the National Flootl Insurance Program in general,
please cell me FEMA Map Inbmaton eXchange at 1-877-FEMA -MAP (1-e77-336 2627) or vistme FEMA Map
Service Cenbrwebsib at h[qh.//msc fema. gov. An accompanying Flood Insuance SW dy report, Letter of Map
Revision FOM R) or Letter of Map Amendment (LOMA) revising portions of this panel, antl digital versions of mis
FIRM maybe available. Visit the North Carolina Flootlplain Mapping Progam website at http //www. D oodmap—,
orcon[ac the FEMA Map Service Center.
Communites annexing land on adjacent FIRM panels must obtain a current copy of the atljacent panel aswell as
the curer[ FIRM Index These maybe ordered d,ecty fhom the Map Service Center at the number listed above.
For community antl countywide map dates referto the Flood Insuance Study reportforthis jurisdiction.
To detennme if toad Insuance Isava,labe In the community, conbctyour Insuance agent or cell the Natonal
Flood Insuance Progam at 1-800-63e-6620.
Base map information shown on this FIRM was previded in digital format by the North Carolina Flootlplain
Mapping Progam (NCFM P). The source of this "tortmaton an be determined from the mebdab available in the
digital FLOOD database antl in the Technical Support Data Notebook TARN).
ACCREDITED LEVEE NOTES TO USERS. If an accredited levee note appeaa on this panel checkwith your local
wiry to obtain more inrortnato, such a, the estimated level of patecton prhi ovmed (wch may exceed the
i spe nt-annual-ehanee level and EmeMenny Acton Plan, on melevee system(,) shown a, previdbg pabcton.
To mitgate flood risk in residual risk areas, property owners antl resident, are encouagetl to torsi derf ootl
antl f oodpreof, or other pmtectve measures. For more iHomaton on flood insuance, interested
parties should visit the FEMA Website at http://www Tema gov/busind—fiph,dexshtm.
PROVISIONALLY ACCREDITED LEVEE NOTES TO USERS If a PavisionalryAmredited Levee (PAL) note
appears on this panel, check with your local community to obtain more information, such as the -mated level of
levee
p hokded (which may exceed the 1_pereent_annual_chance level) and Emergency Action Plan, 0n the
e e synem(s) shown as providing protector. To maintain accredibhon, he levee owner or community Is
required b submit the dab and dommenbtion necesary b comply with Section 65.10 of the NFIP regulators.
If me cemmuniry or owner does not previtle me necessary data and tlocumenbtion or if the data and documentation
pmvitletl od ate, the levee system does not comply with Sector 65.10 requirements, FEMAwill revise the flood
hazaN antl risk i Hormaton for this area to reflect tlaaccreditation of the levee system. To mitgate flood risk in
—dual risk areas, property owners antl resident, are encouagetl th considerfl ood insuance antl flootlpmofing
r other protective measures. For more information on flood insuance, interested paT e,sho a Id visit the FEMA
We ke at http//www Tema gov/bu,ine,,/nfip/i,de-shin.
LIMIT OF MODERATE WAVE ACTION NOTES TO USERS. Forsome coastal flooding zones the AE Zone
category has been divided by Limit of Model -ate Wave Acton FMWA). The LIMWA represent, the appreximate
and— limit of the 1 5-foot breaking wave. The effect, of wave hazards between the VE Zone antl the LiM WA
(or bet —en the sho -eh ne antl the Li M- for areas where V E Zones are not dentifie d) will be "Uh lar to, but less
severe than tho,e In the VE zone.
Limit of Moderate Wave Action (LiMWA)
COASTAL BARRIER RESOURCES SYSTEM (CBRS) NOTE
This map may include approximate bounda ne, of the CERS for inbmatonal purposes only. Flood in,uan a i, not
ailable wimt caRS area, brrnucmre, that a,e newly built or suld,tantally improved on orafrer me date(,?
indiated 0n me nap. Formore nfoVd0 ,eeh[mH.—gov/habibbw,e,at0n/coastal bamerhml he
FIS Report, orall heUS. Fish antl VNltllife Service Customer Service Centerat 1-e00.SOP -WILD.
® CBRS Area Otherwise Protected Area
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Map Prolr"on:
North Carolina State Plane Pr(ojection Feet Zone 3200
Datum HAD 1983 Horizontal NAVD 1988 Vertical
1 inch = 1,000 feet 1:12,000
0 500 1,000 2,000
Feet
Meters
0 150 300 7100
PANEL LOCATOR
G
NORTH CAROLI NA FLOODPLAI N MAPPI NG PROGRAM
NATIONAL FLOOD INSURANCE PROGRAM
'LOOD INSURANCE RATE MAP
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NORTH CAROLINA
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COMMUNITY CID PANEL SUFFIX
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CHATHAM COUNTY 370299 8742 ..
SILER CITY,TOVVN OF 3]0058 K42 ..
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MAP NUMBER
3710874200J
MAP REVISED
02/02/07

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