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cleaned prior to reuse, as discussed in Section 4.0. . Care will be taken not to drop fore; <br /> objects into the wells and not to allow the measuring device to touch the ground around he <br /> well during monitoring. <br /> 3.1 INTERFACE PROBE METHOD <br /> The floating product-water interface probe consists of a electrode suspended by a gradua; <br /> tape from a reel that has a light and two-toned audible signals. Audible and visual signai. <br /> occur when the electrode touches the floating product surface and then the water surface. <br /> The procedure for measuring floating product levels using the interface probe is as follow;;: <br /> 1. Turn interface meter on, and check that it is working. <br /> 2. Lower the interface meter into the well slowly until the meter signals an <br /> interface. Note if the interface is oil or water. <br /> 3. Raise and lower the meter slightly until the shortest length of cable that give: <br /> the maximum response on the meter is found. <br /> 4. With the cable in this fixed position, note the length of cable at the measurir. ; <br /> point. <br /> 5. If the interface recorded above was oil, slowly lower the meter until a water <br /> interface signal is given. <br /> 6. Repeat steps 3 and 4 above. <br /> 7. Turn the probe off and store in a case after cleaning. <br /> 3.2 ELECTRIC SOUNDER AND BAILER METHOD <br /> The procedure for checking present of floating product using an electric sounder and an ac- y is <br /> bailer is as follows: <br /> 1. Measure the water level with the electric sounder as described in Section 2. <br /> 2. Suspend a clean acrylic bailer on a line and slowly lower the bailer into the v1 <br /> until it partially intersects the groundwater surface. <br /> WATER LEVEL, WELL DEPTH, AND FREE FLOATING MEASUREMENTS Page c 6 <br /> MSCIPROTO-WL.= REVISION DATE:MARCH 1996 C L 4 <br />