20081230 Ver 1_Site Plan_20081223

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4" VERTICAL PERFORATED. PVC OBSERVATION WELL WITH CAP \ \ ! - - - \ \ ~ ~ F~ ~ ~y .p
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~ \ ~ f N0. 4 REBAR IN FOREBAY \ _ ~ .
6` TOP EL=425.50 \ ~ ( ' - - BY-PASS WEIR - _ ARCADIA
SEDIMENT TO BE REMOVED \ ~ ~ INV EL=426.50 W FROM FOREBAY WHEN THE ~0 \ ~ ' ( - \F ER SETBACK ~ 2 0
WEIR TOP WIDTH-5.5' ~ 1 ~ 2~ 0,5' SEDIMENT ACCUMALATION F ~ ~ \ !
.WEIR BOTTQM .WIDTH-2:5 REACHES THE TOP Of THE / ~ ~ \ REBAR. \ i ( ~ 30' UUAT RSHED BUFF
TOP. BERM =427.00. ~ ~
- 1071 CLASSIC ROAD
/ / / / / / TOP OF TRENCH ~ ~ ~ ~ APEX, NC 27539
~ ( / o n o 0 0 0 0 o EL=426.00 ~ ~ / / ~ ~ ' (v~ / TELEPHONE: [phone]
~ ~ ' i/ FACSIMILE: 919 363-1477 ~ ~ \
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/ / / / / INV FOREBAY-425.00 Cr ~ ,
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TWO 18" PERFORATED STORAGE ? ~ - /~i,.~
O PIPES 1 0 0 0 i ~ /
O O O O O N0. 57 STONE \ ~ ~ 9+58.11 ~ ~ , ~I ` ;
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EL=423.00 1`! ~ ~ %"~y o 1 WIDTH=6' ` m Q
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1' MIN. UNDISTURBED IN-SITU SOIL ~ ~ ~ Z J
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STORM DRAINAGE DATA ~ / ~ ~ i ~ T
INFILTRATION .TRENCH .CROSS SECTION o - / /
1 NEW 36" FES NOT TO SCALE / / ~ DRAINAGE AREA = 23.7 AC j / / / , V
C = 0,40 S r / / ~ ~ ~ 7 0
110 = 6.25 IN/HR ~ _ / ~ ~ 4.z s / z
.1100 _ 8.51 IN/HR / / ~ Q10 _..59.3 CFS ~ / / i i / _
Q100 = 80.7 CFS ; \ / / / ~ ~ / / / ~ ~ / ~ ~
INV = 419,22 0.6 FT,BELOW STREAM INVERT) ~ / / ( / / Iiw10 - 426,42 Cir / / / ~ i ~ ~ ~ v
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STORM PIPE DATA _ FF / NEW 36" FES W/VELOCITY DISSIPATOR - , ~ \ 2 ~ ; / ~ , ® V ~ j ~ ~ ~ Z ~ _
INV = 418.59. (G.6 FT.BELOW STREAM INVERT) 2Q 6'x35'x3' DEPTH \ / / / S = 1.26% 1 TO 2 50 LF 36" RCP ~ 1.26% INFILTRATION TRENCH \
/ / Q10 = 59.3 CFS / ~ - - / Q i -
- S 3 0 4 32 18" RCP ®L56% ~ / V10 - 11.75 F/ T LF / ~ i ~ J ~ ~ n
W=9' - / = 24' ~ / / ~ L i /
d50 = 13" / i / / NEW VARIABLE PRIVATE DRAINAGE
USE 24" CLASS. "B" RIP RAP W/ GEOTECHNICAL UNDERLINING. ~ / AND ACCESS EASEMENT. / i i /
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3 NEW 18 FES _ C / / / / / / / / ~ / / j ti\ ~
DRAINAGE AREA 0.43 A / / / ~ C=0.40 ) / / ~ j, ~ ~ ~ J , 0
110 = 7.22 IN HR / / / i / /
Q10 = 1.24CFS / / j INV = 427.00 / / /
hw10 = 427,82 / /
i / 9 / 20 X~0 X6 ~ W i i i ~ Z d
4 NEW 18" FES. W/ VELOCITY. DISSIPATOR / / INV = 426,50 / / /
_ S = 1.56% / , ' ~ TE~1Po GRA~E~ o ~
Q10 = 1.24 CFS / / V1i) = 4.67.. ~/S v ~ , Z W
W=5' /
_ ~ / L-6' / ~ ~ ~ , ~.,CO STo E .TRANCE - z
d50 6 USE 18" CLASS "B" RIP RAP W/ GEOTECHNICAL UNDERLINING ~ ~ ~ ~ ~ z
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T / DRAWN BY CHECKED BY
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STORMWATER SUMMARY / - QUANTITY ~ ~ 'I ~ O ~ ~ ~ ' V BGD TDS ~ ~ ~ ~ ~ DATE
PRE-DEVELOPED POST-DEVELOPED i / / i~ ~ ,
DRAINAGE AREA = 0.52 AC DRAINAGE AREA = 0.52 AC ~ / j' - =0.43 ~ ~ / G- 0.22. C ~ /`~y ~1~~
Q=CIA Q=CIA I ~ ~ i ~ ' V REVISIONS ~ ~ ~ ~o
= r Q2 = (0.22)(5.76 INIHR)(0.52 AC) Q2, (0.43)(5.76 INJHR)(0.52 AC) Q2 = 0.66 CFS Q2 =1.29 CFS / ; ~ ~ ~ /
~ / i _ 100-Y / / ~ ~ n
Q10 = (0.22)(7.22 IN1HR)(0.52 AC) Q10 - (0.43)(7.22 IN/HR)(0.52 AC} a ~ / ~ j Q10=0.83 CFS Q10=1.61 CFS I1 •I ~b
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STORAGE REQUIRED INFILTRATION TRENCH 3 / ~ Rv=0.05+ 0.9 0.30 2'-6" , ~s
Rv=o.DS+o.z7 B - AS C ANNEL SECTION
Rv=o.32 Y P S H NOT TO SCALE ~ .y
V=3630(Rd)(Rv)(A)
V=3630(1")(0.32)(0.52 acres) Q100= 1.67 CFS NOTE: SOD CHANNEL AT TIME OF V=604:03cfrequired SLOPE= 9.4% CONSTRUCTION OR USE'
L= 54` NORTH AMERICAN GREEN
STORAGE PROVIDED FOR INFLLTRATION TRENCH M= 3:1 SC150 OR EQUIVALENT FOR Effective infillration area required: BOTTOM WIDTH=2'-6" CHANNEL UNTIL GRASS IS
A = S A =infiltration area required (sf) °n"= 0.03 ESTABLISHED. ~~G~ SHEET TITLE
' 2(K x T) S = volume of water to infiltrate (cf} , K =hydraulic conductivity of the soil (inlhr) y = 0.15 P~ ~~G ~5~ -INFILTRATION
A = 604.03 cf T = dewatering time (days) V100=3.8 FT/SEC
2(0.74 inmr x 2 days) A = 204.06 sf G~ TRENCH DETALL
Infiltration trench = 6' x 35' x 3.33' ~o~
CJ`~io aeawa
QUALITY Nitro en STORM DRAINAGE AND EROSION LEGEND, V~ ~0~ ~BB~ CARQ~ ~
Type of Land Site Area TN Export TN Expori by TN Export
Cover Acres Coeff Land Use From Site ® NEW STORM DRAINAGE PIPE Ibs/ac r Ibslac! r Ibslacl r w`0~ ~ ~~ss~~ /~A m ~ ~.•~~F E 1 ~ti9.9 Am
NEW SILT FENCE Undisturbed - ' D.6 -
0 en S ace LIMITS OF DENUDED AREA Managed 26.15 12 31.38 -..p- TEMPORARY. DIVERSION DITCH 0 3o sa 120 240 ~ m SHEET NUMBER ~4m
0 en S ace s STORM DRAINAGE STRUCTURE NUMBER 0 ~~~~'FN~I NE~~:'~`~~~0
Impervious 3.44 21.2 72.93 _ _
_ Surface e 2 3 2008 oN ~D.- S a -4
rfac 29.59 104.31 BLOCK AND GRAVEL INLET PROTECTION Total Average from 3.53 SCALE:1 "=30' ~~eeaeaeaea~ x
Site WETLANDS AND STORE TER BRANCH
CHECK DAM FOR REVIEW ONLY OF
3.53 Ibs/ac/yr < 3.6 Ibslaclyr O.K.
R:\2006 Projects\06023 - McGuinn Subdivision\CONSTRUCTION\SHEETS\06Q23trench.dwg