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The Leadville Mill <br />Environmental Sampling Procedures <br />Water Sample Collection <br />Page 2 -14 <br />7. Measure from the colored ribbon to the point at which wetness is found on <br />the string, and subtract this distance from the elevation of the top of the well. <br />This is the elevation of the water level at this point in time. Subtract the <br />elevation of the bottom of the well from the elevation of the water level. This <br />gives the height of the water column, and from this the volume of water in <br />the casing can be derived. <br />8. These measurements should be done before flushing /purging to ensure a <br />static water level, and to ensure no contaminants from the measuring are left <br />behind. <br />2.6.2 CALCULATIONS <br />Water table elevation = elevation of MP (surveyed) - measured depth to water. <br />2.7 GROUND WATER SAMPLING <br />2.7.1 FIELD MEASUREMENTS <br />Once a well has been located and properly identified, the following field <br />measurements should be noted in the logbook. A cross reference should be made <br />between the field measurements identifying the well and the measurements of the <br />well to be sampled to ensure that the proper well has been selected. <br />PHYSICAL MEASUREMENTS <br />1. Presence and diameter of protective casing, <br />2. Lock and serial number (if lock is present at the well), <br />3. Diameter and construction material of the casing proper, <br />4. Total depth of well from the top of casing (ToC), surveyor's mark, if present, <br />5. Where possible, depth from top of casing (ToC) to water. Static water level <br />measurements are taken to the nearest 0.5ft from the marked point or, if not <br />marked, the highest point on the well casing. The depth to water will not be <br />measured if the well contains a submersible pump. <br />CALCULATIONS <br />1. Calculate the linear feet of water in the well by subtracting depth to water <br />from total depth of well. <br />April 2013 <br />