2007-06-01_PERMIT FILE - C1981019A ‎(22)‎

• Permit No: C1981019A
• IBM Index Class Name: Permit File
• Doc Date: 6/1/2007
• Doc Name: Attachment 1 to Attachment 12
• Section_Exhibit Name: Exhibit 07 East Taylor Pond 010A
• Media Type: D
• Archive: Yes

.7
•
•
CCILOWYQ CC1AL COMPANY
010A -EAST TAYLOR
SEDIMENTATION POND SUMMARY
ORIGINAL 1998 1998 2006 DIFFERENCE
CONF(GURA710N STUDY STUDY DIFFERENCE STUDY .1998 TO 2406
ATERSHED AREA (acres};
Disturt~d 0.4 0.0 0.4 4:0
Pastmining Tapsailed and Beaded 100.0 126.4 26.0 180.0 54.0
Postminirsg Urn1is#urbad 304.0 148.3 -151.7 377.8 229.5
t-2 Ysar Reclamation 30.2 70.5 40,3 163,6 93.t
3+YearRaclamatian 515.9 573.8 57.9 592.7 18.9
TotalArea 946.1 9t8.6 -27.5 131#.1 395.5
POND PARAMETERS:
Bottom Elevation 6930,0 8934.4 6934A 4A 6930A 0,0
Principal Spiihvay Invert. Elevation 6952.0 6950.0 6952.0 2,0 6952.0 OA
Emergency SpOhvay Invert EESvatian 6954.0 6954.0 6954A 0.0 6954.0 OA
Top of Embankmer% 6956.0 6956.0 6956,0 0.0 6956.0 0.0
Storage Voiuma Ba'aw Emergency Spillway {ac-ft) 8.58 8:58 8.58 0.00 9.1 0.5
Staraga Volume Bekaw Principal Spillway {ac-ft} 7.01 5.62 7A1 1,39 7,5 0.5
Principal SpilMray Parameters:
Type Drop inlet Orop inlet Pert. Riser Parf. Riser
Riser Diameter pn! 18.0 18.0 18.0 0.0 18.0 4.0
Riser Height{ft} 10.2 8.2 10,2 2.d 10.0 -0.2
BartalDiamaterQn} 18.0 t8.4 18A 0.0 18,0 4.0
Elevation of Psrfaratian(s} {ft} N/A NtA 6944,4 6844A
Size of Perforation{s} (in} N/A NfA 4.4 4.0
NumberofParforations NtA N1A 2 2.4
Emergency Spillway Parameters:
Typo Trapezoidal Trapezoidal Trapezoids} Trapezoidal
biamster (tn} NiA N1A NtR N!A
Bottom Width {ft} 24A 20.0 20.0 0.0 2d.0 0.4
Length {ft} 20.0 25,d 20.4 -5.0 20.0 d.0
Side Slopes `z'H;tV (ft} 3.0 3.0 2.0 -1.0 2A 0,4
HYDROLOGIGHYDRAUIIC PARAMETERS:
Rasa Flow Batas {cfs} 1.04 OA3 -0.9T 0.00 0.0
10-Year, 24-Hour Storm Event
Precipitation {In} 1.8 1.8 4.0 7.8 0.0
Runoff Volume {ec-ft} 5.9 7.5 1.6 3.S -4.0
Principal Spillway Peak Discharge (cis} 15.9 4.0 -11.9 1.5 -2.5
Emergency Spillway Psak discharge {cis) 0.0 0.4 0.0 0.0 0.0
Peak Surface WaDef Seaga Elevation {ft} 6953.5 6952.3 -1.2 6947.3 -5.1
25-Ysar, 24•HOUr Storm Event:
Practpitatlon {tn) 2.3 2.3 0.4 2.3 4.4
Runoff Volume {ac-fl} 14.2 13.0 2.8 1 t.7 -t.4
Principal Spillway Peak Discharge {cfa} 18.5 12.0 -6.5 6.3 -5.7
Emergency Spillway Paak Discharge (cis) 25.1 3,7 -21.4 0.0 -3.7
Peak Surface Water Stage Eiavatian {ft} 6954.8 6954.1 A.7 69527 -1.4
Pond Freetaoard (fi} 1,2 1.9 4.7 3.3 1,4
SEDIMENT LOADtPBC; PARAMETERS:
Storm Predictetl Paak Sattiabla Conaentretion {mUl} 4.00 0.00 4.0 0.00 4.0
Predicted Annual Sediment t.oading {aafl} 0.37 1.13 0=76 4A2 3.3
Available Sediment Storage Voiuma {ao-ft} 1.88 1.88 0.00 213 0.3
Maximum Sediment 8tarage Elevation (fl} 6941.8 6941,8 6941.8 4,0 6942.0 0.2
Predicted Number of Store a Years 5.1 1.7 -3.4 D.5 -1.2
Exh. 7-ET-18 Revision Date: 2/1/06
Revision No.: TR-63