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Preliminary Results of Dye- Tracer Test at the B4 Area and Offsite Wells

This study aims to understand groundwater movement in deep bedrock from the B4 area to offsite locations. Initial test results show highly constrained flow paths and fast groundwater movement along discontinuities formed parallel to foliation/layering.

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Preliminary Results of Dye- Tracer Test at the B4 Area and Offsite Wells

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  1. 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)

  2. Sites with TCE detections Rottenwood Southern Polytechnic State University Creek MW0s2 2000 Results Air Force Plant 6 Dobbins Air Force Reserve Base B-4 Area Life University

  3. 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.

  4. Tracer Test Location Map

  5. Sampling Frequency • Weekly sampling at RW203 • Monthly sampling at other sites

  6. 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

  7. 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)

  8. Downgradient Monitoring Well RW203 • Downward flow between 100 and 139’ • Zero flow below 139’ • Dye receptor placed at 105’

  9. Results: Injection 11/13/07 @ 1300 ob203a RW203 SCT2 SCT1 SCT3 (65-95) (100) C (85-125) (139) C (88-105) B (434-457) B (119-198) A A (521-543) (420-560) 92’ 380’ 880’ Depths in parentheses (not to scale)

  10. Results – 3 Days ob203a RW203 SCT2 SCT1 Not sampled Not sampled SCT3 (65-95) 30446 C (85-125) C (88-105) B (434-457) B (119-198) A A (521-543) (420-560) 92’ 380’ 880’

  11. Results – 2 Weeks ob203a RW203 SCT2 SCT1 SCT3 (65-95) 22973 ND C ND (85-125) ND (.030) C (88-105) ? B (434-457) B (119-198) A A (521-543) (420-560) 92’ 380’ 880’

  12. Results – 5 Weeks ob203a RW203 SCT2 SCT1 ND SCT3 (65-95) 6650 0.365 21.4 C (85-125) C (88-105) ND B (434-457) B (119-198) ND (.050) A ND A (521-543) (420-560) 92’ 380’ 880’

  13. Results – 8 Weeks ob203a RW203 SCT2 SCT1 ND SCT3 (65-95) 201 15.6 300.2 C (85-125) C (88-105) B (434-457) B (119-198) ? (not sampled) A ND A (521-543) (420-560) .916 92’ 380’ 880’

  14. Map 8-Weeks

  15. All Results

  16. What would cause such a highly constrained flow path?Why is the flow rate so high?

  17. II IV III I-B I Dominate strike of foliation = green, joints = red

  18. Parting Plane

  19. 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

  20. 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

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