HomeMy WebLinkAboutTED4003246.16REVISIONS
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SEC. 15, TWP. 23 N., RNG. 5 E., W.M.
...................... .. '.. ...........-.....-.-.-...-.....................................:.......
.... ..
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__..........................................................
:.......................................
:....................................... :.........................-..:...- .........................................................
_. _
.'.........
..... .......:... ............ ....-.-...-....-.. ........-........
400
...
... BOTTOM OF ;LIVE STORAGE
EMERGENCY 0VERF LOW
FINISHED
N
ELEV. =390: Q
€ ELEV. = 393 0
.... .............................
.................................................... , ......... ...........................................
.........................
......... .................... .... .... ........... ............................. __ .......................
GRADE
................ .... ......................
.........................................
TOP OF BERM
LIVE STORAGE REQUIRED; 47,169 CF
.. ......
ELEVATION; _
LIVE S RA E PROVIDED; 3- F
T� G C,
�O� 79/. A 15.
........
394.0
.
.
EXISTING GRADE
.
_ _.
390
-
--
. _
-
— 90
3
.....
.. CELL 2 (PEAD STORAGE)
N
CELL 1 DEAD STORAGE
i
BOTTON OF DEAD STORAGE
ELEVATION_- 386.0
.................................................................................................................................................................
................. :...................................... ;................. ...................... :... .................
....
.. s
,. -. �.ry
".
_ .....
SEDIi�fENT--ELEVATION-385:0
. ..:
(1ST CELL ONLY)
...... .... .
;... :......
POND LINER TO TOP OF
DEAD
STORAGE REQUIRED: 34 515 CF
Q ,
.........
DETENTION LEVEL ........
,DEAD
STORAGE
GE PROVIDED: 3 . f 99- CF
....................................... ....................................
38U
...........................................................................................................................
_ _,..........................................................:...:...............................................................
.. ................
__ ...................
............. 380' .:..........:...:.:. ......
.... PROPOSED
DETENTION, POND
...
CROSS SECTION
A
.:.........:.
CONTRACTOR TO INSTALL POND LINER TO THE TOP OF THE
WATER QUALITY LEVEL FOR THE ENTIRE POND.
LINER MAY BE COMPACTED TILL, CLAY OR GEOMEMBRANE.
SEE RIGHT FOR SPECS.
J Ci?M PACI'ED F Il... L LINERS
1. Liner thickness shall be 18 inches after compaction.
2. Soil shalt be �_:ompacted to 95% n-nnimum dry density, modified proctor rnethod (ASTM D-1557).
3. A different depth and density sufficient to retard the infiltration rate to 2.4 x 10 inches per ttritaute
( l x 10 6 c r,/s) may also be used in lieu of Criteria 1 and'.'..
4, Soil should be rlaced i C inch lifts.
1 n � at,
5. Soils may be used that niect the following gradation:
Sieve Size
6 inch
Percent Passing
100
4 inch
90
#4
-
.7 Q 100
#200
20 - 100
CLAY 11NER
1. Liner thickness shall be f 2 inche>.
2. Clay shall be compacted toy_ I minimum dry density, modified r�cton method ASTt I-] 55 ,..
3. A different depth and density sufficient to retard the infiltration rate. to 2.4 x 10-' inches per minute
EI x 10-6 crn/sj may also be used in lieu of Criteria 1 and 2.
• lJ
lic, slope of cla liners must be restricted to sH:l V` for all areas cover-, - ,
l y o c, s requiring soil co t,r, otherwise, the
soil layer must be stabilized by another anethorl so that soil slippa�,t�
e into the facility does not occur.
Any alternative soil stabilization method mu5t take main
tenance access into consideration.
5. Wh
ere clav liners formthe sides of
ponds maintained by the County, the interior sacksl
ope e mast not
be steeper than 3:1, irrespective of fenciril;. This restriction is to ensure that anyone falling into the
pond rraay safely climb out. The same criterion is recommended for privately owned and maintained
ponds.
J
1, Geomeanbrane liners Shall be 1JV resistant and have a aninimutn thickness of 30 millimeters_ A
thickness of 40 millimeters shall be used in areas of maintenance access or where heavy machinery
must be operated over the membrane.
2. ( -ie )membranes shall be bedded according to the, manufacturer's recomn,�ndations.
3. Liners shall be installed so that they can be covered with 12 inches of top dressing, fornung the bottom
and sides of the water quality facility." Top dressing shall consist of 6 inches of crushed rock covered
with 6 inches of native soil. The rock layer is to mark the location of the liner for ,future maintenance
operations- As an alternative to crushed rock, 12 inches of native soil may be used if orange plastic
°safety fencing" or another highly -visible, continuous marker is embedded 6 inches above the
membrane.
4. If possible., liners should be. of a contrasting color so that maintenance workers are aware of any areas
where a liner may have. become exposed when maintaining the facility.
5. Geomembrane liners shall not be used ()it slopes steeper than 5HA V to prevent the top dressing
material from. slipping. "Textured liners may be used on slopes up to 3H:1 V upon recommendation by
a geotechnicai engineer that the top dressing will he stable for all site conditions, including
maintenance.
J CONCRETE LINERS
Portland cement linters are allowed irrespective of facility size, and shotcret . may be used on slopes.
However, specifications must be developed by an engineer who certifies the liner against cracking or -
losing water retention ability under expected conditions of operation, including facility maintenance
operations. NVeight of maintenance equipment can be up to 80,000 pounds when fully loaded.
2. Asphalt concrete may not be used for liners due to its permeability to many- organic pollutants.
A svp B111t T "
w. 32462�
CHECKED FOR COMPLIANCE
TO CITY STANDARDS
Date
Date
Date
RECOffiXE11DED
O. APPROVAL
I. '��.v•
IC
N
A L
N
t
L3 05
EXPIRES: MAY 6, 2007
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DETENTION POND
CROSS -SECTIONS
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