SW3190506_Plan_(Detail)_20190820

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FILL. EMBANKMENTS SHALL BE FORMED OF SUITABLE MATERIAL
PLACED IN SUCCESSIVE LAYERS NOT TO EXCEED MORE THAN SIX (6)
INCHES IN DEPTH FOR THE FULL WIDTH OF THE CROSS-SECTION,
INCLUDING THE WIDTH OF THE SLOPE AREA. NO STUMPS, TREES,
BRUSH, RUBBISH OR OTHER UNSUITABLE MATERIALS OR
SUBSTANCES SHALL BE PLACED IN THE EMBANKMENT. EACH
SUCCESSIVE SIX (6) INCH LAYER SHALL BE THOROUGHLY
COMPACTED BY THE SHEEPSFOOT TAMPING ROLLER, 10-TON POWER
ROLLER, PNEUMATIC -TIRED ROLLER, OR OTHER METHODS APPROVED
BY THE TOWN OF MIDLAND. EMBANKMENTS OVER AND AROUND ALL
PIPE CULVERTS SHALL BE OF SELECT MATERIAL, PLACED AND
THOROUGHLY TAMPED AND COMPACTED AS DIRECTED BY THE BMP
DESIGN MANUAL.
POND EMBANKMENTS SHALL BE INSTALLED IN THIS SAME MANNER
AND SHALL BE COMPACTED TO MEET A DENSITY OF 95% STANDARD
PROCTOR TEST.
SAND FILTER PLAN VIEW
NOTES:
1. CLASS B MATERIAL IS TO BE QUARRY STONE, FIELD STONE, OR
NATURAL STONE ONLY, BROKEN CONCRETE NOT PERMITTED. At2. SAND MEDIA MATERIAL SHALL MEET ASTM C33 AND IS TO BE
FREE OF SILT, CLAY, LOAM, FRIABLE OR SOLUBLE MATERIALS,
ORGANIC MATTER GRADED IN ACCORDANCE WITH ANSI/ASTM C 136. 0 10 20 40
3. SURFACE COURSE AGGREGATE IS TO BE USED AT THE TOP
COURSE OF THE SURFACE SAND FILTER. AGGREGATE TO FULLY
COVER THE UNDERLYING WASHED FILTER SAND TO DEPTH AS
SHOWN IN THE PLANS AND DETAILS. SURFACE COURSE AGGREGATE 1 INCH = 20 FEET
SHALL BE WASHED AND FREE OF DEBRIS, DIRT, SAWDUST, AND IN
FOREIGN MATERIAL. SURFACE COURSE AGGREGATE SHALL BE
ROUNDED, NATURAL RIVER OR BANK AGGREGATE STONE AND NOT
CRUSHED, CHIPPED OR BROKEN STONE. THE STONE IS TO BE A
NATURAL COLOR, EARTH TONES, AND UNDYED, WHILE THE SIZES
RANGE FROM #1 AND #2.
SEDIMENT AREA
FOREBAY SURFACE AREA
BASIN AREA
DRY DETENTION AREA
Incremental
Accumulative
BMP Elevation
Total Basin
Storage
Storage
Sand
Filter 683.5
8405
0
0
684
9651
4514
4514
685
10953
10302
14816
686
12312
11633
26449
687
13728
13020
39469
688
15200
14464
53933
TOP OF BASIN=688.00
EMERGENCY WEIR=16' WIDE (687.50 CREST)
50 YR. HWL=687.95
10 YR. HWL=687.02
1 YR. CPV=685.82
PROP GRATE PER NCDOT
STD 840.16
TOP OF GRATE = 687.50
m
(2) 24"X6" WINDOWS
686.00(*SEE NOTE)
SANDFILTER AREA TOP OF BASIN
RIP RAP BERM = 688,00
tl50=6", CLASS 8 \210'
TOP = 686.00 TOP OF EMERGENCY
3" #1 OR #2 WASHED SPILLWAY WEIR=687.50 TOP OF 3" #1 OR #2 WASHED
ROUND STONE = SEE THIS SHEET FOR DETAIL ROUND STONE
683.75 WQv ELEV=684.62 _
FOREBAY - 8"CLASS "C" CONRETE W v PROVIDED=10 765
= 684.00 TOP OF SAND MEDIA in 1
'i•-�: 683.75
C,�4S = 683.50 OBSERVATION M ' I= 10'
.ti 3. CLEANOUTS I III 683.50 `Y •. ,:..:'ti•S'...' •.Y"':,
S 3:1 n 0 •'7 EL=685.25 I h "'' •..k,"✓, ,^�, •. ,
II IM-M-1II-- II -I I I_FIRM'I _-- IIIL- i_ :L- _-I_-I- .. .. .. .:....... ... .. .. .�"•.
�-- ,: ,.; TOP O.F•:,M:dED;..I�A•;."ij:.;''.•. �,`,'::;. >.::'.• %�.'•.:.`:::�:.t"...:
36" s Q
18"DIAMETER STORM
- -
ITI III- - - - I -III -III -III- I_II_III-III-III II •;: ,. ,. ..,'.;' III�III', `'.:Ill,:�=.,i>::"t;..:•;a.';i,;;:.;:..:.......:.��;.��'�:;.;�� -.p SEWER PIPE
IIL..III,•,I�I„ IL TOPSOIL/SOD FOR LAWN � LI1=_III-I I 0, .• :
INV.=681.00INV.=6810
3SAND MEDIA, NATURAL RIVER
.`'.".
OR BANK SAND MATERIAL (PER
ASTM C33) - :.:•c :,: ., 1 0 TURNUP - 18" STM DUMP ROCK FOR
IIhI II _ `J
ENTIRE WIDTH OF t..: '� ^" C,?.".:.� `.• ., `: •:;`
TOP OF GRAVEL/BOTTOM OF - _ `' .INV OUT = 683 00 EMERGECY SPILLWAY WEIR •d`'.'•`;t:`i"✓';::"�""`••''": "••''
SAND = 681.00 111= =1 1-III=11f:: CLASS B 681.00 ';, +>` �i.; : ": .;.:��-�^<:'"L • �.,:•:.+-. <c':. INV.=681.00
BOTTOM OF GRAVEL =
680.00
GRAVEL FILTER LAYER,
COURSE AGGREGATE,
WASHED GRAVEL
* UNDERDRAIN PIPES SHOULD BE MINIMUM 6"
PERFORATED SCHEDULE 40 PVC (PER AASHTO M278).
PERFORATIONS SHOULD BE SPACED 3" ON CENTER
ALONG 4 LONGITUDINAL ROWS SPACED 900 APART.
GEOTEXTILE
FILTER FABRIC
TYPE 1
- 6" PERFORATED PVC
UNDERDRAIN* (TYP,)
= 680.00 @ 0.00%
ALL SIDE SLOPES TO BE SODDED
SAND FILTER DETAIL
12" FROM BANK
6" SOLID TO
6" PERFORATED
PVC PIPE TRANSITION
FLOWABLE FILL
NOTE: DRAINAGE AREA TO THE SAND FILTER FACILITY
MUST BE STABILIZED BEFORE FILTRATION
CONTROLS AND FILTER MEDIA ARE INSTALLED.
680.00
FILTER FABRIC OR OPEN WEB TURF MAT OR 2" #8 OR #89
WASHED CHOKING STONE
6" DIAMETER PREFORATED STORM SEWER PIPE
@ 0.00%
OUTLET STRUCTURE DETAIL
NOT TO SCALE
OUTFALL=680.18
FLOWABLE
FILL
North Carolina COA
License No.: F-1316
V
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:'Q�'UCINEF: �.•
nnu0
DATE 103/14/2019
DRAWN I DJW
DESIGNED IDJW
CHECKED IFC
PROJECT # ISLNDIS001
SHEET TITLE
BMP DETAILS
SHEET NUMBER
&404