U.S. Department of the Interior U.S. Geological Survey Preliminary Results of Dye- Tracer Test at...
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Transcript of U.S. Department of the Interior U.S. Geological Survey Preliminary Results of Dye- Tracer Test at...
U.S. Department of the InteriorU.S. Geological Survey
Preliminary Results of Dye- Tracer Test at the B4 Area and Offsite Wells
Dye Injection 11/13/07
Results up to 1/8/08 (8 weeks)
Preliminary Results
2000 Results
Air Force Plant 6Dobbins Air Force
Reserve Base
B-4
Area
SouthernPolytechnic
StateUniversity
Life University
Rottenwood
Creek
Sites with TCE detections
MW0s2
Preliminary Results
Objective and Approach
Better understand ground-water movement in deep bedrock from B4 to offsite area
Selected two on-site wells (OB203 and RW203) that were located close enough to each other for an initial test.
Also included off-site bedrock wells in the test that were located downgradient from the injection well.
Preliminary Results
Tracer Test Location Map
Preliminary Results
Sampling Frequency
Weekly sampling at RW203
Monthly sampling at other sites
Preliminary Results
Pre-Injection Background Sampling
Fluorescein (Acid Yellow 73) Eosine (Acid Red 87) Rhodamine WT (Acid Red
388) Sulphorhodamine B (Acid
Red 52) Tinopal CBS-X (Fabric
brightening agent 351) Solophenol 500% (Direct
Yellow 96) D&C Red #28 FD&C Red #3 D&C Green #8 Palanil Luminous Red G Lissamine FF
Preliminary Results
Injection 11/13/07 @ 1300
Set 1-inch PVC to 90 ft 1 gal #3 Red (pre-mixed) Followed by 15 gal water
(Flowmeter indicated no flow below 105 feet)
Preliminary Results
Downgradient Monitoring Well RW203
Downward flow between 100 and 139’
Zero flow below 139’
Dye receptor placed at 105’
Preliminary Results
Results: Injection 11/13/07 @ 1300
ob203a RW203
92’ 380’ 880’
SCT2 SCT1
A
B
C
A
B
C
SCT3
(420-560)
(88-105)
(521-543)
(434-457)
(85-125)
(65-95)
(139)
(100)
(119-198)
Depths in parentheses(not to scale)
Preliminary Results
Results – 3 Days
ob203a RW203
92’ 380’ 880’
SCT2 SCT1
A
B
C
A
B
C
SCT3
Not sampled Not sampled
30446
(420-560)
(88-105)
(521-543)
(434-457)
(85-125)
(65-95)
(119-198)
Preliminary Results
Results – 2 Weeks
ob203a RW203
92’ 380’ 880’
SCT2 SCT1
A
B
C
A
B
C
SCT3ND
ND ND (.030)?
22973
(420-560)
(88-105)
(521-543)
(434-457)
(85-125)
(65-95)
(119-198)
Preliminary Results
Results – 5 Weeks
ob203a RW203
92’ 380’ 880’
SCT2 SCT1
A
B
C
A
B
C
SCT3ND
0.365 21.4
ND (.050)
ND
ND
6650
(420-560)
(88-105)
(521-543)
(434-457)
(85-125)
(65-95)
(119-198)
Preliminary Results
Results – 8 Weeks
ob203a RW203
92’ 380’ 880’
SCT2 SCT1
A
B
C
A
B
C
SCT3ND
15.6 300.2
.916
? (not sampled)
ND
201
(420-560)
(88-105)
(521-543)
(434-457)
(85-125)
(65-95)
(119-198)
Preliminary Results
Map 8-Weeks
Preliminary Results
All Results
LocationDistance
(ft) 3-DAYS 2-WK 3-WK 5-WK 8-WK
RW-203 (100, 139) 92 30446 22973 6990 6650 201
SCT2-C (85-125) 384 ND .365 (.292) 15.673 (8.937)
SCT2-A (521-543) 384 (0.05) (0.916)
SCT-2B (434-457) 384 (ND)
SCT-3 (65-95) 400 ND (ND) ND (ND) ND (ND)
MW0S-2R (133) 528 ND (ND) ND (ND) ND (ND)
MWOS-03 (11-21) 531 ND (ND) ND (ND) ND (ND)
Trib-1 633 ND (ND) ND (ND) ND (ND)
SCT1-C (88-105) 879 0.03 21.455 (4.272) 300.24 (12.712)
SCT1-A (420-560) 879 ND ND
Preliminary Results
What would cause such a highly constrained flow path?
Why is the flow rate so high?
Preliminary Results
I
IV
III
II
I-B
Dominate strike of foliation = green, joints = red
Preliminary Results
Parting Plane
Preliminary Results
Findings (so far)
Fastest GW movement is through transition zone with flow rates on the order of 25 to 50 ft/day
GW movement appears to be strongly constrained along discontinuities formed parallel to foliation/layering (i.e. parting planes and lithologic contacts)
A downward hydraulic gradient in the area appears to influence deeper GW movement
Preliminary Results
Tracer Test Continued…
Stay tuned Sampling every 3 weeks Will continue to sample until dye passes
through system or we are satisfied with results
Other zones/wells may be tested