PERMFILE103025

• Permit No: M2002004
• IBM Index Class Name: Permit File
• Doc Date: 7/8/2002
• Doc Name: Response to Preliminary Adequacy Review APPENDIX B E F
• From: GCC Rio Grande Inc
• To: DMG
• Media Type: D
• Archive: No

Figure 10

~ I
/ '

/ I
I

ft ~
2 year

mini g limit .;;

;
`
~ ~,

~
Reconstructed o I
~,
~N;
`
; , (note 5J
Transition -. i

arroyo ~,.
-`^~:_ J... ,
~
i'.
=~'' ,</ - - `'~
1. (-"
, ';~
Sloping drop structure '
- _ ~ -_ (note 21 I

` ~
t ~
_
~!
'
_
~-~
.rte. i`.
~ 'rj ~
~
,' _

/'
I

y0/
-- - ~
~
-- -- -,
-- - - - - --.-1
7
PLAN VIEW
end sill block
1• Dcniga basis: A ° 3$ acme, Q100 = 100 cfa, arroyo slopcx
0.$%, normal flow depth in arroyo= 1.2$ feet
2. If~nal rsclamatlan does not expose rock along the highwall,
cannmet the slapigg drop slmemre from grouted rock.
C~¢j' ate a "stepped spillway" along the faa, with emallcr
drops of no morc than 18" and leading auras na kea than 4
fa4t• Use end sill block to create random water pockets (sec
"Skpped Spillway Illustration").
i
3. If ¢nat reofamafion expoaee rock, create a "stepped spillway"
slang the face, with smaller drops of no more than 18" and
lattding areas no lase than 4 feet. Use end sill black to create
random water pockeu (see'Stepped Spillway Illuatradon").
4. If ~op height is greater than 30 feet, inveafigate optional
a o pond (see figure "Arroyo "I"Detention Pond").
$. 9figure "Conatmated Arroyo Requiremenh" for details of
m as[mcted arooyo.
`/r`/
4:1 slope J~
landing
~~``
~~~

step
exposed limestone
or limestone blocks
randomly placed
transition grade
original grade -~
Sftseepage _~
cutoff
4:1 max, slope
(see notes 2 and 3)
Conshuct end sill
to form stilling basin
----
---
______dfgp _
height ---- ---------
final reconstructed
arroyo grade
PROFILE VIEW "A" - "A"
(vertical scale 2:1 exageration)
If limestone blocks
sed, grout in place
Spillway Illustration
~ GCC Rio Grande
I Red Rock Plant and Mine
SLOPING DROP STRUCTURE
JUNE 13, 2002