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The probe tip is then lowered into the well and submergedjn <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-water(DTW)indication and the DTVI! <br /> measurement is made accordingly The steadytone 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 baiter is lowered partially through the FLH-water <br /> interface to confirm the FLH on the water surface and as <br /> further indicatton 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 to 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 deionrzed water before use,between <br /> measurements In respectm wells and at the completion of the <br /> days use <br /> i� <br /> SOP- Monitoring Wells <br />