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k <br /> The probe tip Is then lowered into the well and submerged In h <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 steady tone. In ether I <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 probes response, <br /> a product bailer is lowered partially through the FLH-water 1 <br /> Irterface to confirm the FLH on the water surface and as <br /> further indication of the FLH thiclmess,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 avid 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 detonized water before use,between <br /> ti measurements in respective wells,and at the completion of the � <br /> days use. <br /> i <br /> l i <br /> s <br /> 1 <br /> I <br /> f <br /> SOP- Mon1toringWells <br />