| Activated coconut charcoal dye receptors will be retrieved and fresh ones installed weekly. If time-of-travel data is needed, they may be exchanged more frequently during the
first two weeks. All monitoring activities will be conducted in accordance with the Dye Receptor Deployment and Retrieval Procedures and the Quality Assurance Quality Control Plan. Usually, dye receptors are exchanged weekly for at least two months
after the first detection of dye at a spring. This is necessary to allow sufficient time for the dye to reach other receptor locations. If the karst aquifer has turbulent-flow through well-developed bedrock conduits, the dye will usually resurge from a
spring or springs within one week. However, if the dye must travel through a laminar-flow, porous-media aquifer, even for a short distance, it could be months before the first arrival of dye at a spring. |
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