HomeMy WebLinkAboutZ-4324-A Map 18GENERAL NOTES:
1. ALL PROCEDURES, MATERIAL, AND WORKMANSHIP SHALL CONFORM TO THE SPECIFICATIONS OF THE CITY OF LITTLE ROCK.
2. ALL EXCAVATION IS UNCLASSIFIED. CONTRACTOR SHALL TAKE WHATEVER ACTION NECESSARY TO SATISFY HIMSELF AS TO THE ACTUAL SUBSURFACE SOIL
CONDITIONS. NO SEPARATE PAYMENT WILL BE MADE FOR ROCK EXCAVATION BUT SHALL BE CONSIDERED SUBSIDIARY TO THE OVERALL PROJECT.
3. THE CONTRACTOR SHALL ABIDE BY THE CURRENT EDITION OF THE OCCUPATIONAL SAFETY AND HEALTH ADMINISTRATION (OSHA) STANDARD FOR EXCAVATION
AND TRENCHES SAFETY SYSTEM, 29 CFR 1926, SUBPART P, WHICH IS HEREBY INCORPORATED INTO THE SPECIFICATIONS OF THIS PROJECT. THE CONTRACTOR
SHALL SIGN A CERTIFICATION STATING THAT TRENCH SAFETY STANDARDS
IN ACCORDANCE WITH ABOVE REFERENCED LAW HAVE BEEN IMPLEMENTED.
4. THE CONTRACTOR SHALL OBSERVE ALL REQUIREMENTS & STANDARDS OF THE ARKANSAS DEPARTMENT OF HEALTH, THE ARKANSAS DEPARTMENT OF
ENVIRONMENTAL QUALITY, AND THE CITY OF LITTLE ROCK.
5. ANY DAMAGE TO LANDSCAPING AREAS, YARDS, FENCES, OR SIGNS ARE TO BE RESTORED TO A CONDITION SATISFACTORY TO THE OWNER.
6. THE LOCATIONS OF UTILITIES SHOWN ARE APPROXIMATE. ADDITIONAL UTILITIES MAY EXIST. THE CONTRACTOR SHALL BE RESPONSIBLE FOR LOCATION AND/OR
DAMAGE TO UTILITIES.
7. PRIOR TO CONSTRUCTION, THE OWNER SHALL OBTAIN ALL REQUIRED PERMITTING APPROVALS.
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508 -
307--
-306- 304.65
N
14'16" E 102.29' \
TOC=304.45
GUT=303.95
✓ / / 303.50-
2 / 303.25
/
/ / ✓ -� TOC=304.85 /
GUT-304.35
-2-2T-7 ✓
✓ / / / TOC=304.85
/ / ✓ / GUT=304.35
FILL AREA, SLOPE TO SOUTH
/ 304.0 TO 303.5 /
/
303.50
STORM WATER DETENTION AREA
TOP EDGE ELEV. = 303.50
VOLUME = 6,750 OF
MATCH GRADE AT BACK OF
EXISTING CURB
Arkasas State Highway 5
(60' R/W, 24' Asphalt)
N 60'11'23" E 388.01'
494.6 PROVIDE CONSTANT SLOPE TCC=305.35 16.5
FROM EDGE OF SIDEWALK GUT-304.85
•� 27.6 `TO BACK OF CURB 28.2 5.1 = 63.8
51.7
d TOO=305.35 305
TOC=305.35 s..
•s GUT-304.85 GUT=304.85 „ ,T
`30 304.85 ---N --5 55 47 E 210.7
2.2
• • Y Y TCC=304.95 3 • "
GI_ T=304.45 Y
10. Y : , . 304.35 Y 303.85
20.0
9 Y • � U � Y
D Y Y Y
304
Y t Y
Y Y
• � Y Y ` y Y
- - -- --304.05� - - - - - - -
o TOO=304.45
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-GUT=303.95 303.50 4 6 304.45 303.50
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TOC=304.85 304.85 • ; Y'
GUT=304.35 5 .0 .�, 9.0 �` 19.
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20. $ �2 Y GUT=30)�5 Y Y Y Y
_z UINSTALL 250 L.F. OF CURB
�,Y
8.5 , . • ` Y AND GUTTER TO DRAIN TO
3.
• 'j 4 DETENTION AREA
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12.5
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160'x60' (9600 S.F.) PRE-ENGINEERED _ ti
COMMERCIAL METAL BUILDING I Y
F.F. ELEV = 305.0 Y ` `
I 303.65
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I- CONSTRUCT LEVEE TO DETAIN STORM
WATER, HEIGHT VARIES FROM 6" TO
18". TOP ELEV = 303.50
INSTALL 20 L.F. OF 10" PVC CULVERT
AS DETENTION OUTLET. SLOPE AT 1 %.
OUTFLOW CAPACITY = 2.1 CFS
s •.
,.
•_7.
24. Y -
` 20.0
L',
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2
- • 20.0
.5
TOO=304.85
304
GUT=304.35
TOO=304.85
TOC=304.85
GUT=304.35
GUT=304.35
6.7
28.0
303.50 TOC=3C4.45
GU_-303.9
__._.___-__
303.50 6
TOC=304.45
r ,
7777
Y
GUT=303.95
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f 24.5
STORMWATER DETENTION CALCULATIONS
J
Rational Method
/
Q=C*I *A
-
0.0
A=
2.18 acres
CPRE
Pervious, Trees (C=0.25)
2.18 Acres
Pervious, Lawn (C=0.50)
0 Acres
Impervious (C=.92)
0 Acres
Weighted Average C=
0.250
303.50 TURN
CURB
Tcl
22 mins
TO DETENTION
POND/
Tc2
35 mins
Tc3
0 mins
Tc
57 mins
kA
4.00 in/hr, (25-yrstorm)
QPRE=
2.18 cfs
/
QPOST-
4.64 cfs
QDIFF=
2.46 cfs
/
QDETAINED=
(QPRE-QPOST) X tc X Ek
=
4065 cubicfeet
/
=
0.093 acre-ft
Cpost
Pervious, Trees (C=0.25)
0 Acres
Pervious, Lawn (C=0.50)
1.09 Acres
Impervious (C=.92)
1.09 Acres
Weighted Average C =
0.710
Tc1
11.5 mins
Tc2
5 mins
Tc3
11 mins
Tc
27.5 mins
1=
3.00 in/hr, (25-yrstorm)
HiAtot., 4
arbor
5800 Evergreen Drive
Little Rock, AR 72205
Ph (501) 663-8800
Fax (501) 588-0123
www.harborenv.com
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Drawn By:
Date:
JTD
FEB. 2018
Checked By:
Scale:
AHR
1" = 20'
Project Number:
ACGC-17455
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