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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 /> oscillating tone ceases or becomes a steady tone. In either <br /> case,this Is the depth-to-yoater(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.cf lav--ring 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 on the water surface and as <br /> further Indication of the FLH thickness,particularly in cases <br /> Mere 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 /> SOP- Monitoring Wells <br />