PERMFILE56529

• Permit No: C1980007
• IBM Index Class Name: Permit File
• Doc Date: 12/11/2001
• Section_Exhibit Name: Exhibit 48 Drainage Modifications
• Media Type: D
• Archive: No

•
ARCO Coal Company ;;
scbieci /`1Pio- S DETENT/UN T/ME
-11e MS-s TECH~t1/GAL REV/S/ON
o = C Qa)
c = DETENT/Dil/ T/ME
L = //2 FT.
Calculation/Graph Chart
uaie D.7-~r Q~
A = .72 FTZ (SASE UPON /DDS SE77/~T'!E/VT~
Q = S. /~ FT 3 PER M l/J . - BASED UPO~c/ /O YR. - Z'f HR. UDL UM E'
OF D. /7 AC~PF- FT.
0=~0.17~(N'3. 560 X 7.S = 38.E GPM
CZ~*~ C6O)
. v = ~/ /L~~7Z~ - 6d = ZL. Z NRS .
S. /H-

AT A = !/9 FTy (D°~ SED/MEn/T LEvEL'
o = ~llZ) ~/l9~ _. 60 = ~3.Z HRS .
S. / ~t
f}T A = /7SFT Z CU°~SED/M ENT LEI/EL)
Tc =~/Z~(/7S~ - 60 = 63.G NRS.
S/mot
VALVE SETT/NG (SASE- UPON 6D ~SED/MENT LEl/EL)

Q _ ~/Z~ ~/9J ~7. S> _ 70 GPM (DElUfITE.Y/NG DEV/GE G9ic!
r!z't~~6 D) /-/A~t/ DL C 770GP/i'1 F3ASE0 U/~OrV
STA6E-D/SGHARGE CUKVE>
.sac-,as-e ~s-sn