Scope of Work for Storm Event Tracer Test from LF-6-4"

Goals of the Test:

• Compare arrival times of dye from the LF-6 area and the high PCB pulse at IC Spring.
• Determine arrival time of dye at shallow Valhalla wells NN300A and 00370 and landfill well MW4S.

Set up and Preparation

• Prepare 300 gram Fluorescein injection aliquot.
• Prepare standards for fluorometer.
• Set up rain protection at IC spring.
• Set up ISCO samplers for hand sampling for dye and PCBs.
• Stage 10 gal. of clean water at LF-64" for flushing.
• Dedicated bailer samplers should be staged in NN300A, 00370 and MW4S. A background sample from the wells should be taken prior to the injection of dye. The samplers should be left suspended in the well and emptied between samples

Dye Iniection

• Monitor weather and radar for large storm. At least one half inch or more of rain will have to be predicted to mobilize personnel.
• When heavy rains are imminent (radar shows line of storms passing into western Indiana) two person injection team mobilizes to LF6, two person sampling team mobilizes to IC emergence. The IC team begins hourly background sampling at the spring.
• When heavy rain begins, pour dye into LF-64" and flush with 10 gal. clean water.
• Before heavy rain starts, take at least 1 background sample for dye and PCBs at the IC Spring, then commence / hour samples for dye and PCBs until injection.

Field Sampling

• At least one hour after dye injection, and after a visible flow increase has occurred at the IC Spring begin grab sampling for dye (125 ml bottles) and PCBs (1000 ml bottles) every 10 minutes at IC spring. The exact time of accelerated sampling at the spring will be a field decision based on the magnitude of the flow rise and anticipated travel times. It is desired to begin sampling at the spring at a high rate at least an hour before the dye is expected to arrive at the spring.
• Initial labeling will be date, time and site written with permanent ink on the bottle cap.