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(SOP-Corrective Action Plan-Page 2) <br /> Prior to measurement,the instrument tip is lowered into the <br /> well until it touches bottom, using the previously established <br /> top-of-box(i.e.wellhead vault)point,the probe cord(or <br /> halyard)is marked and a measuring tape(graduated in <br /> hundredths of a foot)is used to determine the distance <br /> between the probe end and the marking on the cord, This <br /> measurement is then recorded on the liquid-level data sheet <br /> as the"Measured Total Depth"of the well. <br /> When necessary in using the interface probe to measure <br /> liquid levels,the probe is first electrically grounded to either <br /> the metal stove pipe or another metal object nearby. When <br /> no ground is available,reproducible measurements can be <br /> obtained by clipping the ground lead to the handle of the <br /> interface probe case. <br /> The probe tip is then lowered into the well and submerged in <br /> the groundwater. The probe is slowly raised until either the <br /> oscillation tone ceases or becomes a steady tone. In either <br /> case,this is the depth-to-water(DTW)indication and the <br /> DTW measurement is made accordingly. The steady tone <br /> indicates floating liquid hydrocarbons(FLH). In this case, <br /> the probe is slowly raised until the steady tone ceases. This <br /> is the depth-to-product(DTP)indication and the DTP <br /> measurement is made accordingly. <br /> The process of lowering and raising the probe must be <br /> repeated several times to ensure accurate measurements. <br /> The DTW and DTP measurements are recorded on the <br /> liquid-level data sheet. When FLH are indicated by the <br /> prob's response,a product bailer is lowered partially through <br /> R the FLH-water interface to confirm the FLH on the water <br /> surface and as further indication of the FLM thickness, <br /> particular) in cases where <br /> Y the GLH layer is quite thin. This <br /> measurement is recorded on the data sheet as" <br /> FLH <br /> f thickness." l <br /> In order to avoid cross-contamination of wells during the <br /> liquid-level measurement process,wells are measured in the <br /> order of"clean"to"dirty"(where such information is <br /> available). In addition,all measurement equipment is <br /> cleaned with solution and thoroughly rinsed with deionized <br /> water before use, between measurements in respective <br />` wells,and at the completion of the days use, <br /> t <br /> i <br />