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f <br /> 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 /> oscillating tone ceases or becomes a steadytone. In either 5 <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 /> The process of lowering and raising the probe must be <br /> repeated several times to ensure accurate measurements. The <br /> 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 bailer is lowered partially through the FLH-water <br /> interlace to confirm the FLH on the water surface and as <br /> f further indication of the FLH thickness,particularly in cases <br /> 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"dirt"(where such information is available). In <br /> addition,all measurement equipment is cleaned with solution 1 <br /> and thoroughly rinsed with deionized water before use,between 3 <br /> measurements in respective wells,and at the completion of the x <br /> _ day's use. <br /> 5 <br /> f <br /> I _ <br /> A <br /> i <br /> SOP- Monitoring Wells <br />