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FUGRO WEST, INC. <br /> STANDARD OPERATING PROCEDURES <br />' RE: MEASURING LJQUM LEVELS USING A WATER LEVEL INDICATOR OR)Q CMFACE PROBE <br /> SOP-I2 (CONTINUED) <br />' The process of lowering and raising the probe must be repeated several times to ensure accurate <br /> measurements The DTW and DTP measurements are recorded on the liquid-level data sheet When floating <br />' product is indicated by the probe's response, a product bailer is lowered partially through the <br /> product-water interface to confirm the product on the water surface, and as further indication of <br /> product thickness, particularly in cases where the product layer is quite thin Either this <br />' measurement or the difference between DTW and DTP is recorded on the data sheet as"product thickness" <br /> In order to avoid cross-contamination of wells during the liquid-level measurement process, wells are <br /> measured in the order of"clean" to "dirtv" (where such information is available) In addition all <br /> measurement equipment is cleaned with TSP or similar solution and thoroughly rinsed with deionized <br /> water before use, between measurements in respective wells and at the completion of the day's <br /> activities <br /> I <br /> II ugm w,ct Im <br />. SOP-1106toher 1994 <br />