REP20347

• Permit No: C1981008
• IBM Index Class Name: Report
• Doc Date: 12/11/2001
• Doc Name: APPENDIX D GROUND WATER OBSERVATION WELLS COMPLETION INFORMATION
• Permit Index Doc Type: HYDROLOGY REPORT
• Media Type: D
• Archive: No

F'age 1 of 2
MONITOR WELL LITHOLOG[C LOG
Monitor Well Name GW-tJ16(WIJ0016)
Driltiny Date 0%/J7/Su
Geophysically Logged By
DEPTH (FT)
None
Geologic Unit Monitored Dakota Coal Underburden
Logged By J.S. Dingman _ __
Total Depth Drilled (ft) iU8.2
DESCRIPTION AND COMMENTS

0 - 4 No Data
4 - 12 SILT, It brn - it, brn-red
12 - 21 SILTSTOIJE w/some v fn grnd SAiJGSTONE, It brn; H~0 at 15' -
began injecting at 21'
21 - 26 SILTSTONE and CLAYSTOIJE, Jt brn, v soft
26 - 33 SiLTST0IJE and CLAYSTOIJE, ]t grey, v soft
33 - 34 CLAY, white, intbdd w/SiLTST~DIJE and CLAYSTONE
34 - 37 SAiJDST0IJE, brn, v fn grnd
37
41 - 41
- 43 MUDSTONE, grey-brn
CLAP, white intbdd w/brn .
43 - 46 SILTS70NE, brn, soft
46 - 47 SHALE, carbonaceous, blk-brn
47 - 69.i S[LTSTONE and S11ALE, intbdd, It grey - med grey, bioturbation
structure common
69.i - 76.4 SILTSTONE and SHALE, intbdd, dk grey, occ carbonaceous
76.4 - &2.1 SILTSTONE and SHALE, intbdd, ]t grey at top grading to dk grey _
at bottom; at bottom i.4' carbonaceous shale
82.1 - 62.9 COAL (Upper Dakota)

82.9 -
98.5 _
SILTSTOIJE and SHALE, intbdd, 1_t grey to dk gr•e)• (v carbonaceous),
at 86.U' O.i' thick layer white clay
96.5 - 104.8 COAL (Lower Dakota) with occ silty O.i-0.4' thick stringers, tan-brn
104.8 - i08.2 SILTSTONE and SHALE, white-lt grey intbdd with occ carbonaceous shales
important fJote Because ±Ire top 8 feet of this hole, explore~tion Bole 6;9-C, caved,
the ho]e had to be abandoned. Replacement Yiole for well GW-N15 _
was moved ~cproxinia!ely 30 feet to the west. Remaining portion _
of lithoJogy log presented trere is from this hole. Note that the •
107 begins with the top of the Lower Dakota goal and that i~
D-6 Revised 11/01/86