17_O&M on Magnolia-7-3-2018_conditionally approved

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F LOTS. _ 38 ,
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EXISTING ZONIN
z 7857 30 TYPE. B ...BUFFER
PARCEL # 0157856, 015 _
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DB 6846, PG 534 ,
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IN. 2 UNIT
PARKING REQUIRED. 76 (M / )
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— PARKING PROVIDED: 76
BINS
ROB AVE. WATERSHED DATA \ I
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WATERSHED. HIGH
32.2%
PROPOSED: AC )
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z DISTURBED AREA: 4.2 AC. F 171
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SOIL TYPE. MhC L � �,
— AVERAGE SLOPE: 7% f
VICINITY MAP DISTANCE TO FLOODWAY: 890 LF 1, t
� DISTA
SCALE -+ CTION:SAND FILTER
NOT TO — METHOD OF PROTECTION:
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N 79 57.289 W
_ LONGITUDE
35 59.547
LATITUDE AND LONGI `
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STANDAR
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FLAT „
TOP / � � t
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THROAT(1ST WEIR)
=794.00 F--I
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794.5 /
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FLOW 2N
OVER ( )
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/ 31
IN V OUT=789.5- , \ ,
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TEMPORARY WATER SURFACE >
TEMP
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94.0
T CHAMBER ELEV 7 '
SEDIMENT
0
OREBAY 3.1
1
CLEA NOUTS '
P—RAP SLOPE —
1
CLASS 1 RI SL TOP BERM-796.00 _
N.,
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BAFFLE TOP=794.0 _ r / o
B 3 WASHED
�-- -� ,..M �, A_ � ;:. ,, ,� t' ACCESS E MENT'
, _ _ & ACC A E
STONE SURFACE �� /
GRAVEL/ 5 24 CAP W - —
LEV=791.75-792.0 48" ANTI-SEEP '
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a — — PLATE
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24 INLET aa8) ov osa — 20' 0 20' 40'
DESIGN DATA
mLw 792.0 ® o
DRAINAGE AREA (DA = 3.08 ACRES z
18 MIN „ gos o » _ G2 <
MIN 24 MIN , SCALE. 1 — 20
12 IMPERVIOUS SURFACE (I� = 61.4% 0 �
P _ 1 INCH ..
E SEASONAL HIGH
CLASS 1 RIP RAP DESIGN RAINFALL O
PERFORATED .PIP 12 CLEAN, WASHED, PLUNGE POOL..
L
ACE ELEV=790.0 WATER TABLE SE MASONRY SOD SURF 8.00 COURSE 12 x 6 x 18
ELEV < 78 � ~
3:1 3" WASHED CHOKING SAND FILTER MEDIA
SLOPE STONE OVER DRAIN (
ASTM C-33 SAND MAX. WATER HEIGHT (hf) 24 INCHES
ELEV=790.0 790.75 OR EQUIVALENT)
3
ELEV=790.75-791.75 v
RV = 0.05 + 0.009(I)'_ 0.60 n
NOTES:
1. MAINTAIN SAND FILTER MEDIA SUCH THAT THE INFILTRATION RATE IS GREA
TER THAN OR WQV = P*Rv*DA*43560 / 12 = 6,708 C.F. _
EQUAL TO 2 INCHES PER HOUR. (2"/HR.) = 9,608 CF $y R2V1S10I1
2. UNDER DRAIN SHALL BE 6 'PERFORATED PVC PIPES WITH GLUED JOINTS AND FITTINGS.
CLEAN—OUT CAPS SHALL BE ,SCREW—TYPE.
6,708 x 0.75 DISCOUNT = 5,031 C.F. REQ'D.
3. SAND FILTER SHALL NOT BE INSTALLED UNTIL.ALL AREAS DRAINING TO THE DEVICE MIN: ENT C.F./CHAMBER"
ARE STABILIZED.
SEDIMENT CHAMBER VOLUME.PROVIDED = 3,136 C.F.
4. THE TOWN SHALL HAVE RIGHT TO ACCESS THE PROPERTY FOR THE PURPOSE ON INSPECTIONS OF SAND CHAMBER VOLUME PROVIDED-= 3,184 C.F.
THE SAND FILTER. MAINTENANCE OF THE FILTER SHALL BE THE RESPONSIBILITY OF THE OWNER.
SUGGESTED MAINTENANCE SCHEDULE
DESCRIPTION METHOD' FREQUENCY TIME OF YEAR
SOIL
INSPECT AND REPAIR VISUAL MONTHLY MONTHLY `
" EROSION
ORGANIC LAYER
'S CERTIFICATION OF RUNOFF CONTROL
RE-SOD ANY VOID AREAS BY HAND WHENEVER NEEDED WHENEVER NEEDED F
ENGINEER
DEVELOPED. BY G�G�3��C�C�T NUMBER
IC ERTIFY THAT .THIS PLAN WILL CONTROL RUNOFF IN COMPLIANCE WITH THE
AND FLOOD GANNAWAY L.L.C.
WATER QUALITY R NEEDED
MWATER GUIDELINES FOR R NEEDED WHENEVER 20179
TOWN- OF JAMESTOWN STOR AN OUT SEDIMENT CHAMBER BY HAND WHENEVER
MEASURES SHOWN ON THIS PLAN MEET OR LEAN 500 D STATE STREET
D THAT THE RUNOFF CONTROL MEASU p
CONTROL, AN QUALITY SEDIMENT DEPTH EXCEEDS 6
ES OF THE SAME STORMWATER GUIDELINES FOR WATER Q WHEN S GREENSBORO, N.C. 27405
EXCEED THE GUIDELINES , u,,,
CONTROL. .�'` '�•. 336-706-1222
AND FLOOD CO CA '.,
N RO R DATE
SPRING FLOOD CERTIFICATION
,•......... Z D A BY HAND ONCE PER YEAR ��pp ��//
,. .• SKIM SAND ME I
SEAL 27465 Q SS The undersigned hereby certifies to the best. of his.knowledge and
P.E. EE dp , y belief the location of the subject;property has been checked against F[ o I(�lVAlf�l ll 9 201
QO N y, area HUD/FIA maps and information provided by the Department of BEFORE YOU RIG►
Q - REPLACE SAND MEDIA MECHANICALLY WHEN IT FAILS TO
SEAL. � = WHENEVER NEEDED Housing and Urban Development and finds that.
SIGNATURE _ FUNCTION AFTER
SIGN The subject propertyis located in a SPECIAL FLOOD CALL 811, {-� Q{-
27465 NANCE HAZARD AREA as determined by HUD/FIA flood map. Sheet:e e l�. � E
•: MAINTE FIRM MAP PANEL 3710671400J DATED 3/16/09 N.C. ONE—CALL CENTER' o
u : '•. F ,.•• e The subject property is not located in a SPECIAL FLOOD ITS THE LAWI ``��
DATE `7I i .,,HCIN ,. ,
% R HAZARD AREA as determined by HUD/FIA flood map. C - 6
z m
• t is located in an area which has
The subject property
not been mapped as to flood areas by HUD/FIA. THIS IS NOT A SURVEY. NOT FOR RECORD, SALES, OR CONVEYANCE.
U. _