SW8021208_APPROVED PLANS_20040112

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

_.:tit .. _ '!'.. 1 _,_ ...� :x : A '.i. _ , 1 :F �. ••.; C M li !s • 1� _:J—L .1 ::\.2 _ �, _ _.
existing con. mon.
existing grade
dumpster
f low line
existing iron pipe
centerline
catch basin (DOT)
drainage basin
Rev. Date 1.7 Mites to NC 24/NC5e
Intersection --�
1 10.30.2003 To Swansboro
Cape Carteret
\\,To
�-- SITE
1 Two DlMenslonal Drawing Showing Dimensions
for building, pnrklnq, sidewalks, etc,
TRACT I - The Shoppes @ Cedar Point
Tract I 43531.40 S.F. 1.00 Acres
TRACT II - Carpet Carousel, LLC
Tract II 17293.34 S.F. 0.40 Acres
General Information:
Charles Rawls, PLS has provide the following information;
1. Total existing impervious surface for Tract I + Tract II = 38,276 sf
2. Future impervious surfaces for Tract I + Tract II = 43,736 sf
3. Since the project is built complete with pavement and all flow
is directed to an existing DOT catch basin, the method of
BMP indicates a "sand filter" should be used.
4. DENR correspondence on 4-15-03 discussed sediment basin
and f ilter basin surface area requirements of 360 sq. ft. each side
with volume requirements of 540 cubic feet each side.
5. Subsequent information confirmed the property is within 1/2 mile
of the White Oak River (SA) and size requirements are based
on the 1 1/2" event which increases surface requirements to
540 square feet each basin, and volume requirements to 810 cubic
feet each basin.
Reference:
MS 304, Pg 45
Carteret County Registry
There are no
4-04 Wetlands
cn this tract
30 0 30
Scale, 1' = 30`
VICINITY MAP
NOT TO SCALE
ZW¢
60 90
"AS BUILT'
(DISCLAIMER
This project has been surveyed by Charles Rawls, PL5
These plans have been altered by John McLean to reflect
conditions presently existing.
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Site Drawing which shows FENCING REQUIRED:
all three chambers of the. Owner shall erect a brick,
wood or metal fence which
Stormwater Management Plan restricts access to the entire
assembly shown.
1. Sediment Chamber Access for maintenance remains
2. Sand Filter important, so the use of locking
3. Vegetative Filter gates or fence sections is very
g important.
1. Area of Sediment Chamber
Channel (3.75' x 380) = 145.5 sq.ft.
plus 18' x 23.73' = 427.14 sq. ft.
Total = 572.64 sq. ft.
N.C. Grid North - NAD 83
2. Area of Sand Filter
23.73' x 23.73' = 563.11 sq. ft.
� X
Ln
.-i
X ■ X a ,r
1
III
The south side
of i his inlet
must be "curbed"
to prevent any
floi:, into the
ex, sting 60T
w, h basin
32,
•�°f i `°` Construct curbed
X o section across entry
to DOT catch basin
3to prevent direct
runoff. Set ele. of
�-- new curb at +9.0'
r
1117
118'�2
r
3. Area of Vegetative Filter
3.75' x 80' = 300 sq. ft.
Invert In = + 9.0'
SEDIMENT CHAMBER Overflow into Sand Filter = + 8.6'
Top (above overflow) = + 8.65'
AREA = 572.64 S.F. Bottom of Sediment Chamber = + 7.0'
VOLUME = 916.22 C.F.
Area = 572.64 S.F.
Volume = 916.22 C.F.
Legend:
12
original grade
(R/W)
right of way
a
existing con. mon.
----t�j--.-
existing grade
x�x-xx
dumpster
I x
�
flow line
O
existing iron pipe
centerline
0
catch basin MOT)
chamber walls and f loors
N.C. Grid North - NAD 83
DOT Catch Basin 14
Install new
curb to ele. 12
+ 9.0' 10
Existing
Top 8.5 e
s
Inv. 4.38
4
._ 1. Area of Sediment Chamber
Channel (3.75' x 38.8') = 145.5 sq. ft.
plus 18' x 23.73' = 427.14 sq. ft.
Total = 572.64 sq. ft.
•�+w.rfl•rr wall ltae d.i�1
1g'
aan•
Requirement
Sediment Chamber = 540 sq. ft.
! 11 Deep
14
12
-
Ili�il�lii�iliiiiliYW iiiilil ■ I��fi• � '
Irilfiril•��1•.����
I���r•1•I•.��I•�
N.C. Grid North - NAD 83
14
12
10
e
s
4
2. Area of Sand Filter
i3' = 563.11 sq. ft.
Requirement
Sand Filter = 540 sq. ft.
18" Deep
0 10 20 30 40
14 DOT 14
Catch
12 Basin 12
10 Top 8. 1°
8
6 s
Inv. 4.38
4 4
Flow from the parking lot will enter the sediment chamber
at elevation + 9.0. The sediment chamber is 1.6 feet Flow from the sediment chamber
deep, providing a volume of 916 cubic feet. will enter the filter chamber via
overflow set at + 8.6'
The floor of the sediment chamber is to be set at Ele. + 7.0' The sand filter is 1.5' deep over
an area of 563.11 s.f. . The sand
filter floor is set at + 6.9'
1. Sediment 2. Sand Filter Chamber
Chamber
�w
Rev.
1
N.C. Grid North - NAD 83
3 . Flow f rom sand filter
into vegetative filter G
p
aoa �
�•ated Filter
1� veget
rA
�1
8
i � t■�1■1 � � � � 1■�i■I I�
I�il•f11•��f•�1-
i I1• li• till llllllll� lllllllll� ii� l� illllllll�
1�1.1•f•��l[I•If1•
ir■ ice■ i��� • •
12" diameter
opening in DOT
Catch Basin @
Ele. + 6.0'
18' 1 23.73
Invert Into Overflow
Build overflow across lip of Sediment Chamber into Sand Filter Overflow Ele. + 8.6'
inlet as shown. Set
@
Existing inlet ele.= +8.5' top ele. _ + 9.0' + 9.0' + 8.6'
o of Sand + 8.4' --
I �� Inv. ele. from TOP
filter = + 6.0'
Proposed
1 • �'' f
p D�2replacement ;
curb Floor of .
0
Ele - + 4.38' Sediment w
Chamber
Existing + 7.0` ... � ,... � ... .+'.6.
Outfall
pipe
rb SEDIMENT CHAMBER 5ANDFILTER CHAMBER
DOT CATCH BASIN DETAILS
NT5
The vegetated filter is centipede
sod laid as detailed. The total
width inside the channel is 3.73'
The f ilter abuts the R/W of Hill Street.
3. Vegetated Filter
30
Date
10.28.2003
Ele =+6.0'
Sol;'~_
Invert elevation
at inlet to DOT
catch basin is + 6.0-
rdl
SECTION d-d
0
There are no
404 Wetlands
on this tract
30
Scale: V = 30'
60 90
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Rev.
1
bate \
10.28.2003 M
a~ �
and Filter
i• 12
Sediment Chamber
X 7
x11k45
321
ce of rUrb
4aae to v
LQ
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x 11.70
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73,
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40.0'
10
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ael
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�7 tit
The cover for the sand f ilter
shall be made of 4' wide, 12' long
lengths of aluminum. The frames
must support 250 pound operator weight.
The panels can be either bolted as
shown, or hinged (depending on ease of
mam .facture and installation).
23.73'
Entire sand filter
(24' x 24') must be
covered with aluminum
covers, fitted for locking
as necessary for security.
Access for the sand filter
for maintenance remains
a primary consideration.
7t Position block supports
kneeded for beam
f
hich will carry the
amesaid-coGers. .
Overflow wall from sand
f ilter basin to vegetative
f ilter
Scale V = 15'
aluminum framed
covers 12' max. length
hinged as indicated
Top of Sand +
•8•.4'
,._• :• CMUProposed
rmt2curb P ..:: • =i =:::.�:.::�•;::.:. ;•• • =s •►;:02
. .
u
` reinforcing as needed
1
Cement/c( icrete `� Q
Blocks {design by others) ��`
centipede
CMU (voids fill. I) ,CIVMU sod
+ 6.9' + 6.9'
)VEGETATED FILTER
5,'-.CTION aS0 M�4
Top View of Sand Filter
not to scale
natural grade
.2
(design by others)
ELE=+8.4'
ELE=+6.9'
Geotextile
Fabric around
Aluminum Frame
(see detail)
Sand Filter Basin
There are no
404 Wetlands
on this tract
Top of Sand
2"
Concrete Slab w/
slot for aluminum frame
(f ilter to allow water to pass)
23.73'
ELE=+8.4'
■=%M=. .
-- 6" OPENING FROM SAND FILTER TO VEGETATIVE FILTER
THESE OPENINGS ARE 2 FEET WIDE, SPACED
.APPROXIMATELY 4 FEET APART.
Stainless steel
bolt for frame tie -down
Concrete ,
Beam
(design by others)
Opening
f low outlet
`0�c SECTION c - c
Frame made from
Aluminum
Flat Stock
1/2", welded
for fitting
into slot shown,
(bolted at top)
Frame Detail
CONSTRUCTION NOTES AND EXPLANATION OF SYSTEM
1. The runoff from the parking lot system presently
enters the depressed catch basin inlet at ele. + 8.5'.
This entry path shall be blocked with a poured curb
The overflow elevation shall be set at +9.1'. Flow to the
sediment basin is routed over an approximate 5' wide
overflow weir set at elevation + 9.0'.
2. The sediment chamber is 1.6' deep at the overflow.
It contains 572 sq.ft., has a concrete floor with
paraged masonry walls with overflow details below.
The volume of the sediment basin is 916 cubic feet.
3. The outlet device for the sediment chamber is
a block wall, fashioned as shown on this sheet.
The block wall shall be constructed with five
(5) inch long weirs set with sixteeen (16) inch
blocks separating the weirs. The elevation of
the weirs shall be set at + 8.6' and the elevation
of the highest portion of the wall shall be + 8.65'
16" 16"
Ele = + 8.6' _ - �'---4
5 Ele-+8.6 5,�
Elevation of f loor of sediment chamber is + 7.0'
this allows a depth of 1.6' over sediment chamber
or a volume of 916 cubic feet.
23.75'
4. The sediment chamber f lows into the sand filter chamber.
The sand filter chamber has a concrete floor. It is contained
by paraged masonry walls. The Sediment chamber contains 572 sq. ft.
The sand filter has a depth of 1.6'. The sand size is less than 2 mm.
5. The sand f ilter has a vegetated f ilter located downstream (at the outlet).
The vegetated filter shall be contained within a wall as shown,
complete with centipede sod. The outlet elevation of the vegetated
f ilter shall be set at t 6.0' . This filter is approximately 85 feet long.
Legend:
'x
original grade
(R/W)
right of way
a
existing con. mon.
---Q-----
existing grade
�-X X
�x
dumpster
---x—xj
.-3,
flow line
o
existing iron pipe
centerline
O
catch basin (DOT)
30 0 30 60
Scales 1' = 30'
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