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3. Slowly pull the bailer to the surface.. <br /> 4. Let the bailer stand for several minutes. <br /> 5 Observe the surface of the water within the bailer. Measure the thickness of the <br /> product in the bailer to the nearest 0.01 foot and record the value on the <br /> sampling record. If the product is less than 0.01 foot thick, the amount should <br /> be recorded as less than 0.01 foot. If only a sheen is observed or no floating <br /> product is seen, these observations should be recorded. <br /> 3.3 SY1 EL TAPE AND PASTE METHOD <br /> 1. Measure the water level with an electric sounder as described in Section 2.1. <br /> 2. Spread a thin layer of gasoline or oil-finding paste on one side of a steel <br /> surveyor's tape, beginning at the zero-foot mark and extending up the tape <br /> about 1-foot more than the anticipated thickness of the floating product. <br /> 3. Spread a thin film of water-finding paste on the opposite side of the tape, <br /> beginning at the zero-foot mark and extending up the tape about 1 foot. <br /> Slowly lower the tape into the well until the zero-foot mark is located, about 6 <br /> inches below the water level (the tape reading at the measuring point should be <br /> 6 inches greater than the actual depth to water). Take care not to touch the <br /> sides of the well with the tape. <br /> Slowly remove the tape from the well. The pastes will have changed color <br /> upon contact with the water or the floating product. The product thickness is <br /> the difference between the tape reading at the point where water-finding paste. <br /> indicates the water level and the point where the gasoline or oil-finding paste <br /> indicates the top of the floating product. <br /> 4.0 EQUIPMENT CLEANING <br /> Steel 1 es, electric well sounders, and acrylic bailers will be cleaned after measurements in <br /> each ( 11. Cleaning procedures will be as follows: <br /> Wipe floating product off with disposable towels. Rinse probe or portion of <br /> instrument that was immersed in well water with a solution of laboratory-grade <br /> detergent and potable water. <br /> WATER LEVEL, WELL DEPTH, AND FREE FLOATING MEASUREMENTS Page 5 of 6 <br /> MSCTi ; _WL,TXT REVISION DATE: MARCH 1996 WL-5 <br />