HYDRO29443

• Permit No: M1999002
• IBM Index Class Name: Hydrology
• Doc Date: 5/28/1999
• Doc Name: UIC INFO
• Media Type: D
• Archive: No

Undergrou~ d Injection Control Branch Guidance No. 5
•
not deteriorating.
The stationary tests are evaluated by:
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Checking the strength of the slug, often the detector cannot react quickly enough to measur
the entire distance of the deflection. The deflection should appeaz sharp if the total deflecti~
not measured;
2. Checking the record from the lower detector to see if any increase occurred after the initial
passage of the slug;
3. If a second increase in radiation was detected, check the record from the upper detector (ab
the ejector) to check whether an increase occurred at that detector before the detection of tt
slug by the lower detector, if so, [he detection may be due to an extraneous slug, previously
ejected, moving downward past the tool;
4. If no increase in radiation is detected by the upper detector, then the tracer exited the well t
between the lower detector and the upper detector. The maximum upwazd movement ident
through this test is the elevation of the upper detector;
5. If an increase in gamma ray radiation is detected by the upper detector after the detection b:
the lower detector, the tool should have been moved upward so that the slug had the
opportunity to pass both of the detectors again. If so, repeat steps 2, 3, and 4 until the
maximum upward extent of movement of the tracer is established. This depth should be
recorded and compared with that for the slug tracking and tests conducted in previous year:
To evaluate the logs run before and after all other tests are performed:
1. On a light table, light box orback-lighted window, overlay the initial log above [he final to
focusing on the interval just above the top of the injection interval;
2. After matching depth and/or collar log features, check to be sure that the gamma ray traces
overlay. If they do not, shift one log to the left or right until they generally overlay;
3. Identify regions in which the final log indicates apparent increased radiation. If the magnitt
of the increased radiation is greater than the statistical variation, then radioactive tracer
material has probably adhered to either the well construction materials or the borehole wall
where the waste exited the well bore: and
4. Try to relate all instances of increased radiation above the casing shoe to the results of the
previous testing. If unexplained occurrences persist, the results of a recent part 2 MI test sh
be carefully reviewed to see if upward movement is indicated.
The result of the testing should be determination of a depth above which no upward movement
occurs. The result should be at or below the casing shoe. If it is above the casing shoe, the extent
should be tracked and significance determined.
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