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-3- <br /> . One 20-L Carboy for Detergent Water <br /> . Bathroom Tile Cleaner <br /> 1 . 1 . 8 Documentation Materials <br /> . Black Ball Point Pens <br /> . Bound Field Information Logs Containing Nalge- <br /> Polypaper With Consecutively Numbered Pages <br /> 1 . 1 . 9 Test Equipment <br /> . Portable pH Meter and Probe <br /> • Portable Conductivity Meter With Temperature <br /> Conductivity and Probes <br /> 1 . 2 WELL PURGING <br /> 1 . 2 . 1 Order of Well Purging <br /> Determine the proper sequence to be followed for each <br /> round of purging. The general philosophy of purging <br /> order is from clean wells to dirty wells. <br /> 1 . 2 . 2 Groundwater Well Depth Measurements <br /> Extend a clean weighted tape into the well pipe until <br /> it reaches the bottom to determine the depth of each <br /> new well. This determination is made periodically <br /> (minimum once a year) . It may take several attempts <br /> of bottom sounding to positively locate the bottom of <br /> the well. Read the tape at the top of the well pipe <br /> to the nearest one-hundredth of a foot . This is the <br /> depth (W) of the well used in the equations in <br /> Procedure 1 . 2. 3 . (See Figure 1 . ) Clean the tape and <br /> weight after each use according to procedures <br /> described in Section 1 . 5. <br /> 1 . 2 . 3 Groundwater Well Calculations <br /> Utilize the following calculations to determine the <br /> water surface elevation (L) . The well elevation at <br /> the top of the well pipe (T) and the distance from <br /> the top of the well pipe to the water surface ( S) are <br /> the parameters for this calculation. (T) is known <br /> from standard well elevation surveys which are done <br /> after each well is constructed. (S) is determined <br /> from the data obtained by the field operator . <br />