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k <br /> r . <br /> The probe tip is then loyeered into the we[I and submerged In <br /> the groundwater. An oscillating(beeping)tone indicates the <br /> probe is in water. The probe is slowfy raised until either the <br /> oscillating tone ceases or becomes a steady tone. In either <br /> i case,this Is the depth-to-vrater(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 lovnring 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 /> Interface 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 crass-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 deicnized water before use,between <br /> measurements in respective wells,and at the completion of the <br /> days use, <br /> i <br /> I <br /> I�I 1 <br /> 4 <br /> gill L W <br /> SOP- Moniitaring Wells <br />