# Presentation: 189851

## 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)**

## 2000 Results

**2000 Results**
**Air Force Plant 6**
**Dobbins Air Force**
**Reserve Base**

**B-4**
**Area**

**Southern**
**Polytechnic**
**State**
**University**

**Life University**

- Rottenwood

- Creek

**Sites with TCE detections**

**MW0s2**

## 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.**

## Tracer Test Location Map

## Sampling Frequency

**Weekly sampling at RW203**
**Monthly sampling at other sites**

## 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**

## 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)

## Downgradient Monitoring Well RW203

**Downward flow between 100 and 139’**
**Zero flow below 139’**
**Dye receptor placed at 105’**

## 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)

## 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)

## Results – 2 Weeks

- ob203a

- RW203

- 92’

- 380’

- 880’

- SCT2

- SCT1

**A**

**B**

**C**

**A**

**B**

**C**

**SCT3**

**ND**

**ND**

**ND (.030)**

**?**

**22973**

- (420-560)

- (88-105)

- (521-543)

- (434-457)

- (85-125)

- (65-95)

- (119-198)

## Results – 5 Weeks

- ob203a

- RW203

- 92’

- 380’

- 880’

- SCT2

- SCT1

**A**

**B**

**C**

**A**

**B**

**C**

**SCT3**

**ND**

** ****0.365**

**21.4**

** ****ND (.050)**

**ND**

**ND**

**6650**

- (420-560)

- (88-105)

- (521-543)

- (434-457)

- (85-125)

- (65-95)

- (119-198)

## Results – 8 Weeks

- ob203a

- RW203

- 92’

- 380’

- 880’

- SCT2

- SCT1

**A**

**B**

**C**

**A**

**B**

**C**

**SCT3**

**ND**

** ****15.6**

**300.2**

** ****.916**

**? (not sampled)**

**ND**

**201**

- (420-560)

- (88-105)

- (521-543)

- (434-457)

- (85-125)

- (65-95)

- (119-198)

## Map 8-Weeks

## All Results

| Location | Distance (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 |

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

## Dominate strike of foliation = green,  joints = red

## Parting Plane

## 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**

## 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**