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<br />RECOMMENDED PROCEDURE: <br />With the GR sensitivity set for the lithologic correlation log as outlined above, run one "base log" <br />from the injection zone to at least 500 feet above the injection zone (or at least 200 feet above the <br />top of the confining zone). <br />Commence operating the well at normal operating injection pressure and rate, and continue to do <br />so until the pressure and rate become stabilized. <br />Set the tool so that the injector is positioned just below the tubing packer and inject a "slug" of <br />tracer. <br />Reduce the GR sensitivity enough to keep the entire slug of the tracer radiation within the width of <br />the chart paper (horizontal scale). To do this, a non•recorded pass through the slug may be run. <br />Drop tool to an appropriate depth below the slug and record Log Pass #1. Log to above the upper <br />interface until the radiation level returns to the same level as below the slug. Drop tool to the <br />appropriate depth below the slug and record Log Pass # 2 in the same manner as #1. <br />Repeat log passes process until the tracer slug strength dissipates to one tenth (1/10} of original <br />strength (on Log Pass #1). At this point, reset (increase) the GR sensitivity to the same settings <br />used for the base log, and log from the injection zone to at least 500 feet above the injection zone <br />(or at least 200 feet above the top of the confining zone}. <br />Drop tool to an appropriate depth below the slug, reset (reduce) the GR sensitivity to that used for <br />logging (same setting as Log Pass #1}, and record a log pass up to the packer. Repeat this <br />logging process until the tracer slug is gone or has completely stopped. Then reset (increase) the <br />GR sensitivity back to the base log setting and make a final logging pass from the injection zone to <br />at least 500 feet above the injection zone (or at least 200 feet above the top of the confining zone). <br />This final pass should show a close similarity to the pre-test base log response. NOTE: More than <br />one pass may be shown on a log segment as long as each separate GR curve with its corresponding <br />collar locator are distinguishable, otherwise record each pass on a separate log segment. <br />Drop and set the tool at the depth where the bottom detector is just above the uppermost <br />perforation and inject a slug of tracer (the tool remains stationary for this logging record). As the <br />slug moves past the bottom detector, the log trace should show an increase in the GR response. <br />Hold the tool at this depth while pumping at the equilibrium pressure and rate. <br />SUBMITTING THE RESULTS: <br />An interpretation of the logging results must be supplied when submitting the data for EPA <br />approval. The interpretation must include a fluid loss profile across the perforations, in increments <br />of at least 25~J <br />Include a schematic diagram of the well construction on or with the log. The diagram should show <br />the casing diameters and depths, tubing diameter and depth, pertorated interval, any open hole <br />intervals, tot depth or plugged back total depth, and the location of the tool when the slug was <br />injected. Also, indicate with arrows the pathway(s) the tracer slug appears to have gone. <br />H: \ UIC\R8 UI C•Guidance\INF6R4TS. wpd <br />