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-4- <br /> L = T - S where: <br /> L = Water Surface Elevation <br /> T = Well Elevation at the Top of the Well Pipe <br /> S = Distance From the Top of the Well Pipe to the <br /> Water Surface <br /> The bore volume (V) , expressed in gallons , is calcu- <br /> lated for wells by the following method: <br /> V = (D2/4) (W) ( 7 . 48 Gal ./Ft3 ) n where: <br /> W = Well Depth, Expressed in Feet , From the Top of <br /> Well Pipe (Determined From the Sounding or Boring <br /> Log) <br /> n = 3 . 1416 <br /> D = Diameter of the Well Boring, Expressed in Feet <br /> (Determined From the Boring Log) <br /> See Figure 1 for a diagram of a typical Groundwater <br /> Monitoring Well . <br /> 1 . 2 . 4 Groundwater pH Monitoring <br /> a. Calibrate the instrument before going to the <br /> field. <br /> • Follow the vendor ' s procedures for operation and <br /> the initial daily calibration of the instrument ' s <br /> electronics <br /> . Use two buffers to calibrate the probe. If the <br /> percent slope is less than 85% or if the instrument <br /> indicates probe problems, the probe is suspect. <br /> . Replace or recondition any suspect probe. <br /> b. Restandardize the pH meter in the field with <br /> appropriate buffers to bracket the sample pH. <br /> c Collect samples in clean jars or plastic beakers . <br /> Swirl and discard the first portions. Adjust the <br /> readings for temperature ( if they are not automatic- <br /> ally read) , and record the correct pH value in the <br /> Field Log. <br />