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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 slowiy raised until either the <br /> oscillating tone ceases or becomes a steady tone In either <br /> 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 lowenng and raising the probe must be <br /> repeated several times to ensure accurate measurements The <br /> OTW 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 /> where the FLH layer is quite thin This measurement is <br /> recorded an the data sheet as'FLH thickness' <br /> In order to avoid cross-contamination of wells during the Cquid- <br /> level measurement process wells are measured in the order of <br /> .clean"to'dirty'(where such information is available) In <br /> addRion,all measurement equipment is cleaned with solution <br /> and thoroughly rinsed with deianized water before use,between <br /> measurements in respective wells,and at the completion of the <br /> • days use <br /> i <br /> I <br /> I <br /> i <br /> SOP- Monitoring wells <br />