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The probe tip is then lowered into the well and submerged In <br /> the groundeeater. An oscillating(beeping)tone indicates the <br /> probe is In water. The probe is slowly raised until either the <br /> i oscillating tone ceases or becomes a steadytone. In either <br /> case,this is the depth-to-water(OTW)indication and the DTW <br /> measurement Is made accordingly. The steady tone indicates <br />( floating liquid hydrocarbons(FLH). In this case,the praba Is <br /> slowfy raised until the steady tone ceases. This Is the depth-to- <br /> product(DTP)Indication and the DTP measurement Is trade <br /> accordingly. <br />�I <br /> The process.of lowering and raining the probe must be <br /> repeated several times to ensure accurate measurements. The <br /> DTW and DTP measurements are retarded an the liquid-level <br /> data sheet. When FLH are indicated bythe probe's response. <br /> a product bailer is lowered partially through the FLH-water <br /> Interlace to confirm the FLH an the water surface and as <br /> further Indication of the FLH thickness,particularly in cases <br /> where the FLH layer is quite thin. This measurement is <br /> recorded an the data sheet as'FLH thickness." _ <br /> In order to avoid cress-contamination of wells during the liquid- <br /> level measurement process,wells are measured in the order of <br /> "clean"to"dirty'(where such information is aYailable). In <br /> addition,all measurement equipment is cleaned with solution <br /> and thoroughly rinsed with deianized water before use,between t <br /> t measurements in respecdw yells,and at the completion of the <br /> days use. <br /> i <br /> Ih <br /> E <br /> l <br /> f 4 <br /> E <br /> i <br />' SOP- Monitoring Wells <br /> t <br />