SW8980347_COMPLIANCE_19981027

STORMWATER DIVISION CODING SHEET
POST -CONSTRUCTION PERMITS
PERMIT NO.
SW Jsl%JL`
DOC TYPE
❑CURRENT PERMIT
❑ APPROVED PLANS
❑ HISTORICAL FILE
COMPLIANCE EVALUATION INSPECTION
DOC DATE-
YYYYMMDD

STORMWATER
INFILTRATION POND MAINTENANCE E
E C E I V E
OCT 2 71998
Project Name: South Boardwalk Fishing Pier
PnoJ # S
SO -
Responsible Party Name: Yuzo Ito
Address: 307 Florida Avenue, Carolina Beach, N.C. 28480 Phone No:[phone]
After every runoff producing rainfall event, or at least monthly, whichever comes first:
1. Inspect the infiltration pond(s) for erosion, trash accumulation, grass coverage, and general
condition of the facility.
2. Repair eroded areas immediately, re -seed as necessary, keep side slopes and bottom mowed,
and remove trash.
3. Check any inlet piping, swales and catch basins. Repair broken piping, reseed swales, and
remove trash.
J _ 4. Inspect the bypass/overflow structure for blockage and deterioration. Remove blockage and
repair structure to originally approved design specifications.
YM
Je 5. Check the depth of the pond(s) every six months. If siltation has occurred to the point that
only 75 % of the original design depth is provided, remove the excess silt to the original
depth. Do not over -excavate, as this may cause the required water table separation to be
reduced, and may affect the ability of the system to perform as designed.
6. If drawdown is not accomplished within 5 days, the filter media must be removed and
replaced to design specifications so that the required drawdown is accomplished.
I, Yuzo Ito
agree to be responsible for performing
the maintenance items as listed above for this project. I agree to notify NCDWQ of any problems with
the system, or changes of the name of the project, name of the responsible party, or address.
Signature Date Zak 9
Revised 2111198

Total Drainage Area (top of Basin side slopes) = 3,456 SF
Impervious Area (Roof Edge) = 21828 SF
2,828 - 3,456 = 81.9% Impervious
Rv = 0.05 + 0.009 (81.9)
Rv = 0.79 (in/in)
Volume that must be stored:
V = (Design Rainfall) (Rv) (Drainage Area)
V = 8" rainfall x .79(in/) x 1/12 (feet/in) x 3,456 SF
V = 1,821 CF
Infiltration Basin Sizing
Basin area @ top of Bank Elev. of 10.2' = 3,456 SF
Basin area @ bottom Elev. of 9.5' = 2,972 SF
Average Basin Area = 3,214 SF
3,214 SF (Avg. Area) x 0.7' (Basin Depth) = 2,250 CF Basin Volume
Basin Volume of 2,250 LF is greater than 25 Year, 24 Hour storm runoff volume
of 1,821 CF and is therefore adequate.
Infiltration Rate
Basin must infiltrate all stored runoff within 5 days following a 25 year, 24 hour
storm.
Infiltration rate is 1.5 inches per minute.
Maximum intensity of 25 year, 24 hour storm is 8 inches/hour. The infiltration
rate exceeds the maximum intensity. Therefore, the basin will be dry under
these conditions.
ITO.BASIN CALC.revi.doc Page 2 of 3

Given the high soil permeability and great depth to the seasonal high water
table, the rise in water table during the storm event will not effect the basin
infiltration rate.
• CAP0'•
�l9B:
/a/z1 /98
MBASIN CALC.revi.doc Page 3 of 3

Appendices
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Figure 8.03c Rainfall intensity duration curves —Hatteras.
-
Duration
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ROAD CLASSIFICATION
Primary highway, Light -duty road, hard or
hard Surface. _..._ ......_. improved surface
Secondary highway,
hard surface........__....— — Unimproved road._.
Trails ...................------
Interstate Route ' U. S. Route ;State Route
NC j —
~ ..� CAROLINA BEACH, N. C.
!!UADRAN;GLE LOCATION SW14 WSLMINGTON 15' QUADRANCLE
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s
" ENGINEERING, INC.
2592 HOPE MILLS ROAD
FAYETTEVILLE, N. C. 28306
910-426-2323
Mr. Yuzo Ito June 3, 1998
Fuji Cone, Inc.
100 Industrial Drive
Post Office Box 349
Clinton, North Carolina 28328-0349
Attention: Mr. Yuzo Ito
Reference: Infiltration Tests
South Boardwalk Fishing Pier & Pier House
Carolina Beach, North Carolina
Job No. 3150-98
Dear Mr. Ito :
Soil Tech Engineering, Inc, has recently completed an evaluation of the
subsurface conditions for the development of the South Boardwalk Fishing Pier
and Pier House located at 103 Carolina Beach Avenue South in Carolina Beach,
North Carolina.
Our representative investigated the subsurface soils in the center of the
proposed stormwater infiltration area which we understand will be located
beneath the proposed building . The location of our tests was determined using
the provided site development sketch. Our representative ciassified the
subsurface soils encountered by depth to approximately six feet below the
existing ground surface. The attached tabulation outlines the various stratas
encountered at each location explored. We collected samples of each soil strata
encountered for laboratory analysis. Selected samples were tested in our
laboratory, for grain size analysis in accordance with the American Society for
Testing and Materials (ASTM) procedures entitled ASTM D-422; "Particle Size
Analysis of Sails"_

Infiltration Tests
South Boardwalk & Pier House
Carolina Beach, North Carolina
Page Two
Our representative also conducted an on -site infiltration test to determine the
absorption or infiltration rate of the subsurface conditions. Our findings indicate
a rate of 1.5 inches per minute at the location tested at a depth of approximately
24 inches below the existing ground, surface. We did not encounter
groundwater to the depths explored. We anticipate that the season high
groundwater condition is below the depths explored.
A tabulation of our field and laboratory tests data and a sketch indicating the test
locations is attached. Please contact us if you have questions.
Yours truly,
SOIL TECH ENGINEERING, INC.
C3..NiLS 3 .
Parks A. Downing, Jr.
Manager
James Pate, P.E.
Enclosures
cc: Hill & Associates

Proposed Pier
Proposed Pier House
Carolina Beach Avenue South
SOIL
TECH
ENGINEERING
Denotes IOCa !Cn or rnriltration and
subsur-face testing. South Boardwalk Fjshing Pier

pepth
o" - 2"
2" - 36"
36" - 42"
42" - 72"
Infiltration Test
South Boardwalk & Fishing Pier
Carolina Beach, North Carolina
Job No. 3150-98
Location #1
oil Description.
Gray Silty Fine to Medium SAND
Tan Orange Brown Fine to Medium SAND
Tan Brown Silty Fine to Medium SAND
Tan Brown Silty Fine to Medium SAND w/Shell Deposits
Groundwater was not encountered to the depths investigated.
Infiltration Rate : 1.5 inches per minute
Test Depth : 24 inches below existing surface

Grain Size Analysis
South Boardwalk Fishing Pier & Pier House
Carolina Beach, North Carolina
Job No. 3150-98
Location
#1
#2
Depth:
2.0"-36.0"
36.0"-42.0"
Sieve Size
Percent Passing
By Weight
#10
97.4
98.2
#40
63.4
71.0
#80
6.8
5.1
#200
3.0
2.2
Percent Moisture 2.4% 3.2%
Soil Description Tan Orange
Tan Brown
Brown
Fine to
Fine to
Medium
Medium
SAND
SAND

DIVISION OF WATER QUALITY
INFILTRATION SYSTEM INVESTIGATION
9/ I
1. The minimum bore depth: W' 2
2 - 2.7
V 2. The type of soil: S
t,,,'�3. The expected infiltration rate: it/
t15STD / hour-
f�
�. The depth to the Seasonal High Water Table: q2 (4-2 F-%'j SL
5. Additional comments: 2]
IVee' Vc- l'/�r. �C'''�OVer/u.vS, maven �Zsy� 5lcxrh,
.fin
s l� 01;n? ez7 s5 ?
Signature of Regional Office Personnel:
ft�da�
Linda Lewis, DWQ
Vincent Lewis, Soil Scientist
Permit Application No. ` J 8 ci oo 549- Date 9— 1-7 -9 8
S:IWQSISTORMWATIFORMSIINFINVST.FOR

SOUTH BOARDWALK FISHING PIER &PIER H0� � ORMWATER
Stormwater Infiltration Basin
Operation and Maintenance Plan
E C E I V E0
JUL 2 11998
D
PAOJ # ' 003
1. Inspect the basin after rainfall events. Restore eroded areas to original
grades and dimensions.
2. Check elevations of basin top and bottom annually. Fill any low areas
along basin top to original grade as shown on plans. Remove
accumulated sediment on basin bottom to original grade as shown on
plans.
3. Notify the N.C. Department of Environment and Natural Resources at
[phone] if basin water level does not drawdown completely within
five days following a precipitation event.
OWNER:
zo Ito
(�07 Florida Avenue
Carolina Beach, IBC 28428
[phone]
NOTARY: S a1,'L P FAAe-e-
DATE: / /
COMMISSION
EXPIRES: !
MOW