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The probe tip is then lowered into the well and submerged in <br /> the groundwater. 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 steady tone. In either <br /> case,this is the depth-to-water(DTW)indication and the DTW <br /> measurement is made accordingly. The steady tone indicates <br /> floating liquid hydrocarbons(FLH). In this case,the probe is <br /> slowly raised until the steady tone ceases. This is the depth-to- <br /> product(DTP)indication and the DTP measurement is made <br /> accordingly. <br /> dl The process of iowering and raising the probe must be <br /> repeated several times to ensure accurate measurements. The <br /> 1 DTW and DTP measurements are recorded on the liquid-level <br /> data sheet- When FLH are indicated by the probe's response, <br /> a product baiter is lowered partially through the FLH-water <br /> interface to confirm the FLH on the water surface and as <br /> further indication of the FLH thickness,particularly in cases <br /> I where the FLH layer is quite thin. This measurement is <br /> recorded on the data sheet as"FLH thickness." <br /> In order to avoid cross-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 available). In <br /> addition,all measurement equipment is cleaned with solution <br /> and thoroughly rinsed with deionized water before use,between ; <br /> measurements in respective wells,and at the completion of the <br /> days use. <br /> t . <br /> a <br /> f <br /> 5 <br /> 1 <br /> 1 <br /> I <br /> I <br /> 5 <br /> SOP- Monitoring Weils <br />