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The Leodville Mill <br />Environmental Sampling Procedures <br />Water Sample Collection <br />Page 2 -13 <br />vault should fill with water, the water will not enter the well casing. In areas where <br />there is a high probability of damaging the well (high traffic, heavy equipment) it may <br />be necessary to enhance the protection of the well. The level of protection should <br />meet the damage threat posed by the location of the well. <br />2.6 WATER TABLE ELEVATION MEASUREMENT <br />Depth to water shall be measured. Water -level measurements shall be recorded in <br />the logbook or the field sample data form. Entries in the logbook shall include, but <br />are not limited to, the date and time the water -level measurements are taken, the <br />individuals accomplishing the task, the well or piezometer identification number or <br />designation, the elevation of the top of the casing, the serial number or other <br />identification number of the water level measuring device being utilized, and the <br />depth to water, recorded as the depth from the MP at the top of the casing to the <br />water -level surface and as the elevation of the water level. <br />2.6.1 FIELD PROCEDURES <br />1. After well drilling and casing operations are complete, obtain total well depth, <br />and an initial steady state water level. To obtain this information, use the <br />well drilling log and any other information available from the well driller. <br />2. Verify this information by sounding with a stainless steel weight (Nut or other <br />suitable item) tied to a length of clean dry cotton string (equal to 110% of the <br />well depth) of sufficient strength to support the stainless steel weight. Lower <br />the weight to the bottom of the well, slowing near the bottom, and stop <br />immediately when the string slacks. <br />3. Retrieve string and weight from well and note where on the string wetness <br />starts. Measure from this point to the weight with a tape measure. This will <br />give the initial water depth in the well. <br />4. When water sampling for quarterly tests, and after the submersible pump is <br />installed (if a submersible pump is to be used), lower the weight using clean <br />cotton string, to a point approximately 5ft below the previously noted water <br />depth. <br />5. Note on string precisely the top of well with a colored ribbon, then retrieve <br />the weight from the well. <br />6. If there is no wetness on the string, repeat step 5, except lower an additional <br />5ft. Repeat as necessary until the top of water is encountered. <br />April 2013 <br />