Preliminary Results of Dye Tracer Test at the

Preliminary Results of Dye. Tracer Test at the B 4 Area and Offsite Wells Dye Injection 11/13/07 Results up to 1/8/08 (8 weeks) U. S. Department of the Interior U. S. Geological Survey

Sites with TCE detections d o o nw te t o R ek Cre 2000 Results Air Force Plant 6 Dobbins Air Force Reserve Base B-4 Southern Polytechnic State University MW 0 s 2 Life University Area Preliminary Results

Objective and Approach § § § Better understand ground-water movement in deep bedrock from B 4 to offsite area Selected two on-site wells (OB 203 and RW 203) 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 RW 203 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 RW 203 § § § Downward flow between 100 and 139’ Zero flow below 139’ Dye receptor placed at 105’ Preliminary Results

Results: Injection 11/13/07 @ 1300 ob 203 a RW 203 SCT 2 SCT 1 SCT 3 (100) (139) 92’ (65 -95) C (85 -125) B A C (88 -105) (434 -457) B (119 -198) (521 -543) A (420 -560) 380’ Depths in parentheses (not to scale) 880’ Preliminary Results

Results – 3 Days ob 203 a RW 203 SCT 2 SCT 1 Not sampled 30446 92’ Not sampled SCT 3 (65 -95) C (85 -125) B A C (88 -105) (434 -457) B (119 -198) (521 -543) A (420 -560) 380’ 880’ Preliminary Results

Results – 2 Weeks ob 203 a RW 203 SCT 2 22973 ND SCT 1 SCT 3 ND (65 -95) C (85 -125) B A C (88 -105) (434 -457) B (119 -198) (521 -543) A (420 -560) ? 92’ ND (. 030) 380’ 880’ Preliminary Results

Results – 5 Weeks ob 203 a RW 203 6650 SCT 2 ND 0. 365 SCT 1 SCT 3 ND ND (. 050) 92’ (65 -95) C (85 -125) B (434 -457) A (521 -543) 21. 4 ND 380’ 880’ Preliminary Results C (88 -105) B (119 -198) A (420 -560)

Results – 8 Weeks ob 203 a RW 203 201 SCT 2 ND 15. 6 SCT 1 SCT 3 C (65 -95) (85 -125) 300. 2 B (434 -457) ? (not sampled) A . 916 92’ (521 -543) ND 380’ 880’ Preliminary Results C (88 -105) B (119 -198) A (420 -560)

Map 8 -Weeks Preliminary Results

All Results Location Distance (ft) 3 -DAYS 2 -WK 3 -WK 5 -WK 8 -WK 30446 22973 6990 6650 201 . 365 (. 292) 15. 673 (8. 937) (0. 916) RW-203 (100, 139) 92 SCT 2 -C (85 -125) 384 SCT 2 -A (521 -543) 384 (0. 05) SCT-2 B (434 -457) 384 (ND) SCT-3 (65 -95) 400 ND (ND) MW 0 S-2 R (133) 528 ND (ND) MWOS-03 (11 -21) 531 ND (ND) Trib-1 633 ND (ND) SCT 1 -C (88 -105) 879 0. 03 21. 455 (4. 272) 300. 24 (12. 712) SCT 1 -A (420 -560) 879 ND ND ND Preliminary Results

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

II IV III I-B I Preliminary Results Dominate strike of foliation = green, joints = red

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 Preliminary Results