2014-05-05_HYDROLOGY - M1977348

• Permit No: M1977348
• IBM Index Class Name: HYDROLOGY
• Doc Date: 5/5/2014
• Doc Name: Groundwater characterization report
• From: Golder Associates
• To: DRMS
• Email Name: ECS
• Media Type: D
• Archive: No

April 2014
Table 1: Monitoring Well Construction Summary
103- 81640A
Notes: 1- Coordinates are in Colorado State Plane North Grid NAD 83 and elevations are on NAD 88 datum. Top of well pads about 6 inches above land surface.
2- MW -5 through MW -7 installation date is date the well, filter pack and grout placement were installed in the borehole, but completion with concrete pad,
bollards and protective steel riser was conducted at a later date.
3- Well total depths for MW -1 through MW -4 measured by Golder 7/30/2010 from the top of the PVC well casing top; bls = below land surface. Borehole
and well construction logs were unavailable for MW -4. Information provided for MW -4 was obtained from a video survey of the well performed on July
30, 2010. MW -1 well casing likely extended sometime after construction based on differences in drilled depth based from borehole log and total depth
measurement made 7/30/2010; was reduced by 0.30 feet on 01/10/2013 to enable closing and securing the steel protective riser lid.
4- Screened interval is the depth interval of the nominal length of the screen pipe section, and not the actual measured length of the perforations provided
on the well construction diagrams.
I: \10 \81640A\ 0400\ GWCharWelllnstallFieldRep _Fnl- 28Apr14 \Tables \Table 1 Monitoring Well Construction Summary_Draft_02142014.x1sx
Golder
Associates
Elevation
Elevation
Well
Well
Screened
Filter Pack
Bentonite
Well
Easting'
Northing'
, PVC T o
p
Concrete
�
Installation
Well Material
Depth s
Interval a
Interval
Seal
Interperted
No.
(feet)
(feet)
Pad Top
2
Type
Interval
Screened Unit
(feet)
Date
(ft bgs)
(ft bgs)
(ft bgs)
f
ft bgs)
MW -1
3097466
1486791.74
5272.09
5269.95
6/2/1998
2 "/ SCH40 PVC
65.9
6-26
5 - 26
1 -5
Niobrara /Codell
Contact
MW -2
3097623
1487456.76
5266.03
5263.95
6/1/1998
2 "/ SCH40 PVC
112
89-109
87-109
81.5-87
Niobrara /Codell
Contact
MW -3
3097729
1486250.38
5261.03
5258.8
6/1/1998
2V SCH40 PVC
107.2
84-104
81.5 - 113
77.5-81.5
Niobrara /Codell
Contact
MW -4
3098893
1484259.44
5246.13
5243.77
April, 1999
2 "/ SCH40 PVC
188.3
-168-188
unknown
unknown
unknown
MW -5
3097214
1489893.21
5276.42
5273.86
11/30/2012
2 "/ SCH40 PVC
57.4
37.3-57.1
35.2-57.4
32.7-35.2
Silt Overburden
MW -6
3098238
1486747.45
5239.68
5237.64
12/19/2012
4 "/ SCH40 PVC
229.7
209.4 -229.4
205.5 -231.1
203.0 -205.5
Niobrara
MW -7
3098804
1484797.04
5219.61
5217.22
12/15/2012
4'Y SCH40 PVC
259.2
238.8 -258.8
236.1 -259.2
231.2 -236.1
Niobrara
Notes: 1- Coordinates are in Colorado State Plane North Grid NAD 83 and elevations are on NAD 88 datum. Top of well pads about 6 inches above land surface.
2- MW -5 through MW -7 installation date is date the well, filter pack and grout placement were installed in the borehole, but completion with concrete pad,
bollards and protective steel riser was conducted at a later date.
3- Well total depths for MW -1 through MW -4 measured by Golder 7/30/2010 from the top of the PVC well casing top; bls = below land surface. Borehole
and well construction logs were unavailable for MW -4. Information provided for MW -4 was obtained from a video survey of the well performed on July
30, 2010. MW -1 well casing likely extended sometime after construction based on differences in drilled depth based from borehole log and total depth
measurement made 7/30/2010; was reduced by 0.30 feet on 01/10/2013 to enable closing and securing the steel protective riser lid.
4- Screened interval is the depth interval of the nominal length of the screen pipe section, and not the actual measured length of the perforations provided
on the well construction diagrams.
I: \10 \81640A\ 0400\ GWCharWelllnstallFieldRep _Fnl- 28Apr14 \Tables \Table 1 Monitoring Well Construction Summary_Draft_02142014.x1sx
Golder
Associates