PERMFILE129408

• Permit No: M2002004
• IBM Index Class Name: Permit File
• Doc Date: 7/8/2002
• Doc Name: Surface Water
• From: GCC Rio Grande Inc
• To: DMG
• Section_Exhibit Name: D-3
• Media Type: M
• Archive: No

T
22
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NOTES:
1 . In pit sediment and detention ponds capture and
temporarily store the 10 -year flood and sediment.
Larger floods also contained in the pit, but could
infringe on mining activities. Initial pond size
based on area of first 5 -years of mining. Pond
enlarged at year 5 based on area of 25 -years of
mining. Water is pumped out into a reconstructed
arroyo. Pump discharges into a spreader structure
to dissipate flow energy. See figure
"Reconstructed Arroyo "B" RR Spur Culvert
Station 55 +00" for example.
2. For the initial mining operation, a temporary,
smaller arroyo will be excavated to daylight
Arroyo "B" (see figure "Reconstructed Arroyo
"B'• Typical Cross Section "). The final
configuration of the arroyo will be constructed
during reclamation of the initial mining operation.
3. Storm runoff around the plant site operation are
controlled by diversion ditches I, 2, and 4 (see
figure "Diversion Ditch Requirements ").
4. Plant area storm runoff is collected and conveyed
by a 25 -year storm sewer system, which
discharges into Arroyo "F" Sediment and
Detention Pond (see figure "Plant Area Surface
Water Management Plan "). Storm runoff is
temporarily stored before controlled release into
Arroyo "E ". An oil /water separator traps oily
water from the "first flush" runoff event,
minimizing oil discharges into the detention pond.
The pond also serves to trap sediment from the fill
area and Plant area.
5. Four culvert crossings are provided for the
Railroad Spur and two culvert crossings are
provided for the Access Road. All culverts are
sized to pass the 100 -year flood with low head
(i.e.: Hw /D ratio less than 1.5). A riprap lined,
preformed scour basin is provided, where
necessary to control erosion at the culvert outlet.
See figure "Arroyo "A" RR Spur Culvert Station
38 +10" for example.
6. As part of reclamation, 100 -year storm runoff in
the arroyos above the mine site will be conveyed
down the restored highwall by drop structures (see
figure "Sloping Drop Structures "). As an option,
Arroyo 1 Pond #1 can also be used in place of the
drop structure (see figure "Arroyo "I" Pond # 1 ).
14
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P:\CAD\OGCC\06-13-02\GCC.JPG
R65W R64W
Sri 'I
GCC R10 GRANDE, IN(
RED ROCK PLANT & LIMESTONE MIN
Pueblo County, Colorado
EXHIBIT D -3
SURFACE WATER MANAGEMENT PLA
REV DESCRIPTION BY DATE :ter
BY KFF 1PREPARED BY: WPR I DATE:06.28.02
LEG E/VO
PRE"STING STRUCTURES
ADDmmw FEATURES
g- USWEST/DWEST TELEPHONE LINE
NNEE ACCESS ROAD
PoER
SPUR
:,,„ yam, PERMIT BOUNDARY
OPTIC
FIBER OPTIC LINE
RESOURCE BOUNDARY
PROPERTY BOUNDARY
STOCK FENCE
t5 MINE PLAN -YEAR COMPLETED
UNDERGROUND WATER PIPE
NORTH
�H MAINLINE RAILROAD
Tralmverse Mercator Projection
ACCESS ROADS
1927 North American Datum
Zone 13
0 600 1200
Scale in Feet
R65W R64W
Sri 'I
GCC R10 GRANDE, IN(
RED ROCK PLANT & LIMESTONE MIN
Pueblo County, Colorado
EXHIBIT D -3
SURFACE WATER MANAGEMENT PLA
REV DESCRIPTION BY DATE :ter
BY KFF 1PREPARED BY: WPR I DATE:06.28.02