HomeMy WebLinkAboutZ-4324-A Map 2GENERAL 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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179
308°
--30 --
---306--� 304.65
TOC=304.45
74- GUT=303.95
303.50'
/
2/ 303.25 -
TOC=304.85
GUT=304.35
2-207 % /
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 CF
MATCH GRADE AT BACK OF
EXISTING CURB
Arkasas State Highway 5
(60' R/W, 24' Asphalt)
494.E PROVIDE CONSTANT SLOPE
F 27.6 FROM EDGE OF SIDEWALK
`TO BACK OF CURB
TCC=305.35 TOC=305.35
GUT=304.85
• '�• GUT-304.85
2.2
• , Y TCC=304.95
• GUT=304.45 - -----
F I O.
Y
20.0 • ` `
CONSTRUCT LEVEE TO DETAIN
WATER, HEIGHT VARIES FROV
18". TOP ELEV = 303.50
NSTALL 20 L.F. OF 10" PVC CULVERT
AS DETENTION OUTLET. SLOPE AT 1%. I
OUTFLOW CAPACITY = 2.1 CFS
304.05
11�
303.50 304.45
OC=304.85 9 V1 y v 304.85
GUT=304.35
Y
20.0 9
8.5
F� � 0
303 -
303.50
N 60'11'23" E 388.01'
TCC=305.35
28.2 5.1 GUT=304.85 63.8
304
- TOC=304. '
- GUT=303.95
54.0 r�.�•v;,
•2 -
60 A.. (9600 S.F.) PRE-ENGINEERED
j COMMERCIAL METAL BUILDING
F.F. ELEV = 305.0
Y
Y
20.0
24. -
Y
'2 T5
- 304
\ TOC=304.85 TOC=304.85 -
GUT=304.35 GUT=304.35
28.0
OC=3C4.45 303.50 16.
303.95
• - -. Y • Y 77777.
y Y
Y
303.50 TURN CURB /
TO DETENTION POND /
C
C
12.5
x
304.85
I&
TOC=304.85
GUT=304.35
V-
0
M
6.7
16.5
51.7
303.85
• • ' INSTALL 250 L.F. OF CURB
' . • AND GUTTER TO DRAIN TO
• • ' DETENTION AREA
Y • v
c') 303.65
TOC= 304.85
GUT=304.35
�- TOC=304.45
GUT=303.95
STORMWATER DETENTION CALCULATIONS
IF Rational Method
Q=C*I *A
0 A=
2.18 acres
CPRE
Pervious, Trees (C=0.25)
2.18 Acres
Pervious, Lawn (C=0.50)
0 Acres
Impervious 1
0 Acres
Weighted Average C =
0.250
Tcl
22 mins
Tc2
35 mins
Tc3
0 mins
Tc
57 mins
1=
4.00 in/hr, (25-yrstorm)
QPRE=
2.18 cfs
QPosT=
4.64 cfs
QDIFF=
2.46 cfs
QDETAINED=
(QPRE-QPOST) X tC X 60
=
4065 cubicfeet
=
0.093 acre-ft
CIOSt
Pervious, Trees (C=0.25)
0 Acres
Pervious, Lawn (C=0.50)
1.09 Acres
Impervious (C=.92)
1.09 Acres
Weighted Average C =
0.71C
Tc1
11.5 mins
Tc2
5 mins
Tc3
11 mins
Tc
27.5 mins
1=
3.00 in/hr, (25-yrstorm)
ftaibor
5800 Evergreen Drive
Little Rock, AR 72205
Ph (501) 663-8800
Fax (501) 588-0123
www.harborenv.com
J
=
REGISTERED
PROFESSIONAL
ENGINEER
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Drawn By:
Date:
JTD IFEB.
2018
Checked By:
Scale:
AHR
ill= 20'
Project Number:
ACGC-17455
C 2