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1 <br /> ' from well construction data, and will be noted in the logbook The sounder will be decontaminated <br /> after use in each well <br /> Detection of Immiscible Layers <br /> After measuring the water level, and prior to well sampling activities, the ground water will <br /> ' be sampled for floating product To detect the presence of floating, immiscible layers on top of the <br /> ground-water surface, a clear Teflon bailer will be lowered approximately one-half its length below <br /> ' the surface of the water The bailer will be removed from the well and its contents inspected for <br /> immiscible layers or iridescence If immiscible fluids are observed, a sample will be collected for <br /> ' laboratory analysis If the immiscible layer is greater than one-quarter inch, an interface probe will <br /> be used to measure the thickness of the floating product <br /> ' Well Purging <br /> g g <br /> The saturated well casing volume will be calculated for each well by measuring the depth to <br /> water with a sounder and calculating the vertical length of the saturated well casing Once the <br /> vertical length of the saturated well casing is determined, the water column volume within the well, in <br /> ' gallons, will be estimated by multiplying the number of feet of saturated well casing by 0 65 gallons <br /> per 1 foot saturated thickness The saturated well casing volume will then be increased by 30 percent <br /> ' to account for an assumed porosity of the filter pack <br /> Well purging consists of removing a sufficient volume of ground water from the well to <br /> ' enable the collection of a representative sample At least three well casing volumes may be hand- <br /> bailed or pumped from each well prior to collecting a ground-water sample for laboratory analysis <br /> ' Well purge water will be monitored and documented at each well volume for conductivity, pH, and <br /> temperature Well purge water will be contained in DOT 17H 55-gallon drums Well development <br /> ' water and well purge water will be contained in the same drum(s) for each well All storage, <br /> handling, and disposal of potentially contaminated ground water will comply with county, state and <br /> federal regulations <br /> SAMPLAN 162 <br /> 044-0162VTATR1-05106!92 19 <br />