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| After the completion of the analysis of the background dye receptors, the matrix interference investigation, and the placement of dye receptors in all springs, karst windows,
cave streams, lakes, surface streams, monitoring wells and selected water wells, dye will be injected directly into a sinking stream, sinkhole, well, or hole excavated in the soil. If a sinking stream or sinkhole can be located in the appropriate place for dye injection, it will be used. However, it is usually necessary to either dig a dye injection pit with a backhoe or drill an injection well. If it is more than about 17 feet to bedrock, then an injection well will be the only choice. It may not be necessary to drill a new well, however. Capacity tests can be performed on all existing monitoring wells, and if they will take water at a sufficient rate for dye injection and flushing, then it may be possible to use one or more of them for dye injection. If not, then it will be necessary to drill an injection well (which could also serve as a monitoring well). The well or wells will be drilled at sites where there is a good chance of intersecting a karst conduit. Such sites are where lineaments intersect, or where geophysical techniques (microgravity, electrical resistivity or natural potential) have identified them as favorable. Water from a hose or a water truck will be used to flush the dye past the soil into a bedrock crevice that leads to a cave stream. Usually about 500 gallons of water are injected into the hole or well to make sure that it drains sufficiently and to wet the soil so that less dye will be sorbed by clays. The dye is then injected and flushed with at least 2,000 gallons of water. Usually five or six dye traces can be performed simultaneously by using different dyes. |
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