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• Preparation of location <br /> 1 1 Clear the area around the well of foreign materials, such as brush, rocks, debris, <br /> etc <br /> ' 2. Remove all casing caps from the groundwater!monitoring wells Allow the water <br /> i levels to stabilize <br /> Water Level Measurement <br /> The first sampling operation will be water level measurement. An electrical interface <br /> probe is be used to measure the depth to groundwater below the datlun to the nearest <br /> c-mch(0 01 foot) <br /> I 1 Using the oil/water interface probe, measure the depth to water (DTW) and total <br /> , <br /> depth(TD)In each well. <br /> a. Start with the least contaminated well(MW-3). <br /> ' b Measure the depths from the top of casing(TOC). <br /> c Decontaminate the probe aft each well <br /> d Record the results m Table 2 Well Measurements <br /> , <br /> e The depths should be recorded to the nearest 0 01 foot. <br /> ! Table 2 Well Measurements <br /> ' Well Number DTW (ft ) TD (ft ) e b7 <br /> MW-1 l � -V/ � j,6, <br /> MW-2 33 7Z I11 � s� <br /> S Mw-3 ;9 • 8g <br /> MW-4 3 <br /> f For MW-2 measure the freeinduct thickness FPT: <br /> P <br /> g Calculate the corrected depth to water using the following equation and <br /> record <br /> CDTW=DTW—(FPT*SG) <br /> where,CDTW=Corrected Depth to Water <br /> DTW=Ongu W Depth to Water <br /> FPT=Free Product Thickness <br /> SG=Specific Gravity(Fuel Oil=0 82—0 95) <br /> CDTW: <br /> 2 Note the condition of each well in Table 3 Well Condition <br /> ' 4 <br /> • <br /> 1 <br />