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�r <br /> The process of lowering and raising the probe must be repeated several times to ensure accurate <br /> ii measurements The DTW and DTP measurements are recorded on the liquid-level data sheet <br /> When floating product is indicated by the probe's response, a product bailer is lowered partially <br /> through the product-water interface to confirm the product on the water surface, and as further <br /> indication of product thickness, particularly in cases where the product layer is quite thin Either <br /> this measurement or the difference between DTW and DTP is recorded on the data sheet as <br /> "product thickness " <br /> In order to avoid cross-contamination of wells during the liquid-level measurement process, wells <br /> are measured in the order of"clean" to "dirty" (where such information is available) In addition, <br /> all measurement equipment is cleaned with TSP or similar solution and thoroughly rinsed with <br /> deionized water before use, between measurements in respective wells, and at the completion of <br /> the day's activities <br /> Fugro West Inc <br /> SOP 12/October 1994 <br />